Pub Date : 2024-09-22DOI: 10.1016/j.ceramint.2024.09.296
Hongzhi Xiao , Guo Tian , Jiaojiao Liu , Yongyi Zhang , Quanzhang Wen , Linzhao Ma , Hao Li
A series of hexagonal perovskite Ba12M0.5Zr0.5Nb9O36 (M = Ni, Mg, Co, Zn) ceramics were prepared by solid-state reaction method. XRD and Rietveld refinement results showed that all ceramic samples belong to the hexagonal perovskite structure with R-3m space group. With different B-site ion substitution, variation of permittivity (εr) can be ascribed to the average ion polarizability. Ceramics with highest relative density exhibit maximum quality factor (Q×f) values. Among all samples, the optimal microwave dielectric properties of εr = 35.2, Q×f = 57,985 GHz, and τf = 26.4 ppm/°C for Ba12Mg0.5Zr0.5Nb9O36 were obtained, which indicated that Ba12Mg0.5Zr0.5Nb9O36 ceramic is a candidate material for microwave communication applications.
{"title":"A series of Ba12M0.5Zr0.5Nb9O36 (M=Ni, Mg, Co, and Zn) microwave dielectric ceramics with hexagonal perovskite structure","authors":"Hongzhi Xiao , Guo Tian , Jiaojiao Liu , Yongyi Zhang , Quanzhang Wen , Linzhao Ma , Hao Li","doi":"10.1016/j.ceramint.2024.09.296","DOIUrl":"10.1016/j.ceramint.2024.09.296","url":null,"abstract":"<div><div>A series of hexagonal perovskite Ba<sub>12</sub>M<sub>0.5</sub>Zr<sub>0.5</sub>Nb<sub>9</sub>O<sub>36</sub> (M = Ni, Mg, Co, Zn) ceramics were prepared by solid-state reaction method. XRD and Rietveld refinement results showed that all ceramic samples belong to the hexagonal perovskite structure with <em>R-</em>3<em>m</em> space group. With different B-site ion substitution, variation of permittivity (<em>ε</em><sub><em>r</em></sub>) can be ascribed to the average ion polarizability. Ceramics with highest relative density exhibit maximum quality factor (<em>Q×f</em>) values. Among all samples, the optimal microwave dielectric properties of <em>ε</em><sub><em>r</em></sub> = 35.2, <em>Q×f</em> = 57,985 GHz, and <em>τ</em><sub><em>f</em></sub> = 26.4 ppm/°C for Ba<sub>12</sub>Mg<sub>0.5</sub>Zr<sub>0.5</sub>Nb<sub>9</sub>O<sub>36</sub> were obtained, which indicated that Ba<sub>12</sub>Mg<sub>0.5</sub>Zr<sub>0.5</sub>Nb<sub>9</sub>O<sub>36</sub> ceramic is a candidate material for microwave communication applications.</div></div>","PeriodicalId":267,"journal":{"name":"Ceramics International","volume":"50 23","pages":"Pages 49514-49519"},"PeriodicalIF":5.1,"publicationDate":"2024-09-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142664110","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Vanadium-doped barium hexaferrite with a nanostructure is a highly valuable material in various technological fields, such as electronics, permanent magnets, and sensors. The Ba1-xFe12-xVxO19 (x = 0, 0.02, 0.04, 0.06, 0.08, and 0.1) nanoparticles derived from the aqueous solutions containing Fe:Ba molar ratio of 10:1 through the sol-gel auto-combustion method. Computational study was also performed using the first-principles density functional theory (DFT) approach. Crystal structure optimization, band structure, and density of states (DOS) calculations were conducted by CASTEP code. The variation of the structural, magnetic, optical, morphological, and electronic properties of V5+-doped barium hexaferrite was investigated. The XRD analysis combined with the Rietveld refinement showed the hexagonal structure of M-type barium ferrite (BaM), confirmed by the FT-IR analysis. The morphology of BaM nanoparticles was studied by the FE-SEM and TEM micrographs. In addition, magnetic and optical properties were analyzed through VSM and UV–Vis analysis. Crystallite size was found to be highly effective in tuning the coercivity and optical band gap of barium hexaferrites, which varied, respectively, from 3.24 to 4.83 kOe, and 2.69–3.69 eV. Magnetic results showed that several variables like cations distribution, lattice strain, and hematite secondary phase affected the nanoparticles’ magnetization. The DFT simulation results showed a sharp reduction of electronic band gap energy whether V takes the position of Ba or Fe (from 1.10 eV in undoped to 0.64 and 0.14 eV in doped structures). The projected density of states (PDOS) calculations demonstrated that the d orbitals of V and Ba mainly contribute to the valence band maximum (VBM) and conduction band minimum (CBM), respectively.
具有纳米结构的掺钒六价钡铁在电子、永磁体和传感器等多个技术领域都是一种非常有价值的材料。Ba1-xFe12-xVxO19 （x = 0、0.02、0.04、0.06、0.08 和 0.1）纳米粒子是通过溶胶-凝胶自燃烧法从含铁：钡摩尔比为 10:1 的水溶液中获得的。计算研究还采用了第一原理密度泛函理论（DFT）方法。利用 CASTEP 代码进行了晶体结构优化、能带结构和状态密度 (DOS) 计算。研究了掺杂 V5+ 的六价钡铁氧体的结构、磁性、光学、形貌和电子特性的变化。XRD 分析结合 Rietveld 精炼显示了 M 型钡铁氧体（BaM）的六方结构，并得到了 FT-IR 分析的证实。通过 FE-SEM 和 TEM 显微照片研究了 BaM 纳米颗粒的形态。此外，还通过 VSM 和 UV-Vis 分析仪分析了磁性和光学特性。研究发现，晶体尺寸对调整六价钡的矫顽力和光带隙非常有效，其变化范围分别为 3.24 至 4.83 kOe 和 2.69 至 3.69 eV。磁性结果表明，阳离子分布、晶格应变和赤铁矿次生相等几个变量都会影响纳米粒子的磁化。DFT 模拟结果表明，无论 V 位于 Ba 还是 Fe 的位置，电子带隙能都会急剧下降（从未掺杂结构中的 1.10 eV 降至掺杂结构中的 0.64 和 0.14 eV）。投影状态密度（PDOS）计算表明，V 和 Ba 的 d 轨道分别对价带最大值（VBM）和导带最小值（CBM）做出了主要贡献。
{"title":"Structural, magnetic, optical, and electronic properties of vanadium-doped barium hexaferrite nanoparticles: Experimental and DFT approaches","authors":"Aref Besharat, Seyedeh Mansoureh Hashemi, Esmaeil Mohebbi, Saeed Hasani","doi":"10.1016/j.ceramint.2024.09.286","DOIUrl":"10.1016/j.ceramint.2024.09.286","url":null,"abstract":"<div><div>Vanadium-doped barium hexaferrite with a nanostructure is a highly valuable material in various technological fields, such as electronics, permanent magnets, and sensors. The Ba<sub>1-x</sub>Fe<sub>12-x</sub>V<sub>x</sub>O<sub>19</sub> (x = 0, 0.02, 0.04, 0.06, 0.08, and 0.1) nanoparticles derived from the aqueous solutions containing Fe:Ba molar ratio of 10:1 through the sol-gel auto-combustion method. Computational study was also performed using the first-principles density functional theory (DFT) approach. Crystal structure optimization, band structure, and density of states (DOS) calculations were conducted by CASTEP code. The variation of the structural, magnetic, optical, morphological, and electronic properties of V<sup>5+</sup>-doped barium hexaferrite was investigated. The XRD analysis combined with the Rietveld refinement showed the hexagonal structure of M-type barium ferrite (BaM), confirmed by the FT-IR analysis. The morphology of BaM nanoparticles was studied by the FE-SEM and TEM micrographs. In addition, magnetic and optical properties were analyzed through VSM and UV–Vis analysis. Crystallite size was found to be highly effective in tuning the coercivity and optical band gap of barium hexaferrites, which varied, respectively, from 3.24 to 4.83 kOe, and 2.69–3.69 eV. Magnetic results showed that several variables like cations distribution, lattice strain, and hematite secondary phase affected the nanoparticles’ magnetization. The DFT simulation results showed a sharp reduction of electronic band gap energy whether V takes the position of Ba or Fe (from 1.10 eV in undoped to 0.64 and 0.14 eV in doped structures). The projected density of states (PDOS) calculations demonstrated that the <em>d</em> orbitals of V and Ba mainly contribute to the valence band maximum (VBM) and conduction band minimum (CBM), respectively.</div></div>","PeriodicalId":267,"journal":{"name":"Ceramics International","volume":"50 23","pages":"Pages 49412-49425"},"PeriodicalIF":5.1,"publicationDate":"2024-09-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142664125","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-09-21DOI: 10.1016/j.ceramint.2024.09.219
Tiantian Yu , Xiaohui Zhang , Quan Tang , Xiaoying Zhong , Qiujuan Chen , Liya Zhou , Fuwang Mo
A series of double molybdates with palmierite-related structure phosphors K5Yb1-x (MoO4)4:xEr3+ were synthesized by a solid-state method. It has been demonstrated that the K5Yb1-x (MoO4)4: xEr3+ phosphors are capable of exhibiting the characteristic green and red UC emission of Er3+ ions with excitation at 980 nm. Moreover, the green light emission is far more than the red light emission, so that the sample emits a powerful green light, which belongs to the two-photon absorption process. The upconversion efficiency is peaked when the content of Er3+ ions is 10 mol %. The optical thermometry properties of phosphors were explored by observing that the green UC emission intensity is temperature dependent. The maximum sensor sensitivity of the studied phosphor was discovered to be about 1.61%K−1 at the optimum doping concentration. And the phosphor is demonstrated to have high thermal stability by temperature cycling test. Eventually, a green light-emitting diode device was realized by using synthesized particles and a 980 nm near-infrared chip, which can emit a more obvious green light when the voltage reaches 1.80 V and the current can reach 800 mA, thus confirming its applicability in solid-state lighting. And the LED devices have been tested for life stability with little or no light degradation. These properties make the phosphors not only suitable for non-contact optical temperature measurement, but also able to be applied to solid state lighting.
{"title":"Synthesis and upconversion color Tunability luminescence of K5Yb(MoO4)4 phosphor doped with Er3+and optical temperature sensing applications","authors":"Tiantian Yu , Xiaohui Zhang , Quan Tang , Xiaoying Zhong , Qiujuan Chen , Liya Zhou , Fuwang Mo","doi":"10.1016/j.ceramint.2024.09.219","DOIUrl":"10.1016/j.ceramint.2024.09.219","url":null,"abstract":"<div><div>A series of double molybdates with palmierite-related structure phosphors K<sub>5</sub>Yb<sub>1-<em>x</em></sub> (MoO<sub>4</sub>)<sub>4</sub>:<em>x</em>Er<sup>3+</sup> were synthesized by a solid-state method. It has been demonstrated that the K<sub>5</sub>Yb<sub>1-<em>x</em></sub> (MoO<sub>4</sub>)<sub>4</sub>: <em>x</em>Er<sup>3+</sup> phosphors are capable of exhibiting the characteristic green and red UC emission of Er<sup>3+</sup> ions with excitation at 980 nm. Moreover, the green light emission is far more than the red light emission, so that the sample emits a powerful green light, which belongs to the two-photon absorption process. The upconversion efficiency is peaked when the content of Er<sup>3+</sup> ions is 10 mol %. The optical thermometry properties of phosphors were explored by observing that the green UC emission intensity is temperature dependent. The maximum sensor sensitivity of the studied phosphor was discovered to be about 1.61%K<sup>−1</sup> at the optimum doping concentration. And the phosphor is demonstrated to have high thermal stability by temperature cycling test. Eventually, a green light-emitting diode device was realized by using synthesized particles and a 980 nm near-infrared chip, which can emit a more obvious green light when the voltage reaches 1.80 V and the current can reach 800 mA, thus confirming its applicability in solid-state lighting. And the LED devices have been tested for life stability with little or no light degradation. These properties make the phosphors not only suitable for non-contact optical temperature measurement, but also able to be applied to solid state lighting.</div></div>","PeriodicalId":267,"journal":{"name":"Ceramics International","volume":"50 23","pages":"Pages 48967-48976"},"PeriodicalIF":5.1,"publicationDate":"2024-09-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142664301","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-09-21DOI: 10.1016/j.ceramint.2024.09.288
B. Ameri , F. Taheri-Behrooz , M. Ghahari
This study aims to improve the mechanical properties of biocompatible ceramic materials, which are known for their superior potential to integrate with bone compared to metallic implants. However, achieving sufficient mechanical strength, particularly for weight-bearing areas, poses a challenge. Hydroxyapatite (HA) powder is synthesized, taking into consideration the mechanical mixing and aging effects to achieve the desired composition and properties. The synthesized HA powder undergoes calcination under various atmospheres to assess its impact on the crystal structure. The study also explores the coating of HA particles with silicon dioxide (SiO2) using tetraethyl orthosilicate (TEOS) to enhance surface modification and wettability. This process results in a triphasic powder consisting of HA, tricalcium phosphate (TCP), and calcium phosphate silicate (CPS). The morphology of the powder is analyzed using techniques such as energy-dispersive X-ray spectroscopy (EDX), scanning electron microscopy (SEM), and X-ray diffraction (XRD). Moreover, a refined sintering procedure is developed to minimize cracking volume, leading to a significant 117 % increase in compressive strength compared to commercial materials. Finally, the powder is optimized for 3D printing by adding water, simplifying its use in biomedical applications.
这项研究旨在改善生物相容性陶瓷材料的机械性能，众所周知，与金属植入物相比，陶瓷材料与骨骼的结合潜力更大。然而，要获得足够的机械强度，尤其是在承重部位的机械强度，是一项挑战。羟基磷灰石（HA）粉末的合成要考虑到机械混合和老化效应，以达到所需的成分和性能。合成的 HA 粉末在各种气氛下进行煅烧，以评估其对晶体结构的影响。研究还探讨了使用正硅酸四乙酯（TEOS）在 HA 颗粒上涂覆二氧化硅（SiO2），以增强表面改性和润湿性。这一过程产生了一种由 HA、磷酸三钙 (TCP) 和磷酸钙硅酸盐 (CPS) 组成的三相粉末。利用能量色散 X 射线光谱（EDX）、扫描电子显微镜（SEM）和 X 射线衍射（XRD）等技术分析了粉末的形态。此外，还开发了一种精制烧结程序，以最大限度地减少开裂体积，从而使抗压强度比商用材料显著提高 117%。最后，通过加水优化了粉末的三维打印，简化了其在生物医学应用中的使用。
{"title":"Calcium-based triphasic powder synthesis for strengthening 3D printed bone scaffolds","authors":"B. Ameri , F. Taheri-Behrooz , M. Ghahari","doi":"10.1016/j.ceramint.2024.09.288","DOIUrl":"10.1016/j.ceramint.2024.09.288","url":null,"abstract":"<div><div>This study aims to improve the mechanical properties of biocompatible ceramic materials, which are known for their superior potential to integrate with bone compared to metallic implants. However, achieving sufficient mechanical strength, particularly for weight-bearing areas, poses a challenge. Hydroxyapatite (HA) powder is synthesized, taking into consideration the mechanical mixing and aging effects to achieve the desired composition and properties. The synthesized HA powder undergoes calcination under various atmospheres to assess its impact on the crystal structure. The study also explores the coating of HA particles with silicon dioxide (SiO2) using tetraethyl orthosilicate (TEOS) to enhance surface modification and wettability. This process results in a triphasic powder consisting of HA, tricalcium phosphate (TCP), and calcium phosphate silicate (CPS). The morphology of the powder is analyzed using techniques such as energy-dispersive X-ray spectroscopy (EDX), scanning electron microscopy (SEM), and X-ray diffraction (XRD). Moreover, a refined sintering procedure is developed to minimize cracking volume, leading to a significant 117 % increase in compressive strength compared to commercial materials. Finally, the powder is optimized for 3D printing by adding water, simplifying its use in biomedical applications.</div></div>","PeriodicalId":267,"journal":{"name":"Ceramics International","volume":"50 23","pages":"Pages 49437-49449"},"PeriodicalIF":5.1,"publicationDate":"2024-09-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142664124","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-09-21DOI: 10.1016/j.ceramint.2024.09.277
Yuqi Su , Tianbin Zhu , Nanjie Sun , Qiang Zhang , Heng Wang , Yawei Li , Feng Hu , Zhipeng Xie
The fracture toughness and wear resistance of WC-based ceramics are crucial factors that determine their subsequent applications. In this study, the mechanical and tribological properties of expanded graphite (EG) reinforced WC ceramics consolidated by oscillatory pressure sintering (OPS) were investigated. The results demonstrated that the combination of dynamic pressure and EG had a synergistic effect, resulting in a much higher relative density of 0.2 wt% EG/WC ceramics reaching up to 99.78%. Simultaneously, 0.2 wt% EG/WC ceramics demonstrated a reduced grain size, with fracture toughness, flexural strength and wear rate reaching 7.54 MPa m1/2, 1262 MPa and 2.16 × 10−7 mm3·N−1·m−1, respectively. EG was present in the form of graphene nanoplatelets (GNPs) within WC ceramics. The primary toughening mechanisms involved the bridging and pulling out of GNPs, as well as the generation of microcracks induced by GNPs. Additionally, the exceptional thermal conductivity of GNPs can facilitate heat dissipation and reduce thermal damage. The wear resistance of WC-EG ceramics was primarily enhanced through improving overall mechanical properties and decreasing the occurrence of oxidation and adhesive wear.
{"title":"Tailoring mechanical and tribological properties of oscillatory pressure sintered binderless WC ceramics with expanded graphite addition","authors":"Yuqi Su , Tianbin Zhu , Nanjie Sun , Qiang Zhang , Heng Wang , Yawei Li , Feng Hu , Zhipeng Xie","doi":"10.1016/j.ceramint.2024.09.277","DOIUrl":"10.1016/j.ceramint.2024.09.277","url":null,"abstract":"<div><div>The fracture toughness and wear resistance of WC-based ceramics are crucial factors that determine their subsequent applications. In this study, the mechanical and tribological properties of expanded graphite (EG) reinforced WC ceramics consolidated by oscillatory pressure sintering (OPS) were investigated. The results demonstrated that the combination of dynamic pressure and EG had a synergistic effect, resulting in a much higher relative density of 0.2 wt% EG/WC ceramics reaching up to 99.78%. Simultaneously, 0.2 wt% EG/WC ceramics demonstrated a reduced grain size, with fracture toughness, flexural strength and wear rate reaching 7.54 MPa m<sup>1/2</sup>, 1262 MPa and 2.16 × 10<sup>−7</sup> mm<sup>3</sup>·N<sup>−1</sup>·m<sup>−1</sup>, respectively. EG was present in the form of graphene nanoplatelets (GNPs) within WC ceramics. The primary toughening mechanisms involved the bridging and pulling out of GNPs, as well as the generation of microcracks induced by GNPs. Additionally, the exceptional thermal conductivity of GNPs can facilitate heat dissipation and reduce thermal damage. The wear resistance of WC-EG ceramics was primarily enhanced through improving overall mechanical properties and decreasing the occurrence of oxidation and adhesive wear.</div></div>","PeriodicalId":267,"journal":{"name":"Ceramics International","volume":"50 23","pages":"Pages 49326-49338"},"PeriodicalIF":5.1,"publicationDate":"2024-09-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142664348","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-09-21DOI: 10.1016/j.ceramint.2024.09.273
Bingxue Han , Chongyang Chen , Lijia Chen , Bin Wu , Zhijun Wang , Benshuang Sun , Jilin He
How to refine the grain has been a difficult problem in the preparation of high-performance ceramic targets. In this work, the doping-induced grain refinement strategy was proposed, indium zinc oxide doped with different concentrations of Pr (Pr-doped IZO, PrIZO) targets were obtained by optimizing the sintering time and holding temperature. Effects of Pr doping content on the density, phase microevolution, grain size and resistivity during the densification process as well as the kinetics of the grain growth and the mechanism of grain refinement of PrIZO targets were investigated in detail. The results demonstrated that PrIZO targets with the atomic ratios of Pr:In:Zn = 0.01-0.03:1:1 all exhibited the excellent performance with high densification (>99.10 %) and mere average grain size (<3.0 μm) at low sintering temperature of 1350 °C. Additionally, XRD and EDS analysis indicated that PrIZO targets were composed of In2O3 and Zn3In2O6 with slight PrInO3, which formed by the limited solid solubility of Pr element. Combined with theoretical calculations, it inferred that the mechanism of grain refinement was attributed to the solute transformation and fine PrInO3 distributed at the grain boundaries of In2O3 phases, which produced the drag effect of grain boundary migration, then hindering the further growth of grains.
{"title":"Grain refinement for indium zinc oxide ceramic targets by praseodymium doped induced blocked boundary migration","authors":"Bingxue Han , Chongyang Chen , Lijia Chen , Bin Wu , Zhijun Wang , Benshuang Sun , Jilin He","doi":"10.1016/j.ceramint.2024.09.273","DOIUrl":"10.1016/j.ceramint.2024.09.273","url":null,"abstract":"<div><div>How to refine the grain has been a difficult problem in the preparation of high-performance ceramic targets. In this work, the doping-induced grain refinement strategy was proposed, indium zinc oxide doped with different concentrations of Pr (Pr-doped IZO, PrIZO) targets were obtained by optimizing the sintering time and holding temperature. Effects of Pr doping content on the density, phase microevolution, grain size and resistivity during the densification process as well as the kinetics of the grain growth and the mechanism of grain refinement of PrIZO targets were investigated in detail. The results demonstrated that PrIZO targets with the atomic ratios of Pr:In:Zn = 0.01-0.03:1:1 all exhibited the excellent performance with high densification (>99.10 %) and mere average grain size (<3.0 μm) at low sintering temperature of 1350 °C. Additionally, XRD and EDS analysis indicated that PrIZO targets were composed of In<sub>2</sub>O<sub>3</sub> and Zn<sub>3</sub>In<sub>2</sub>O<sub>6</sub> with slight PrInO<sub>3</sub>, which formed by the limited solid solubility of Pr element. Combined with theoretical calculations, it inferred that the mechanism of grain refinement was attributed to the solute transformation and fine PrInO<sub>3</sub> distributed at the grain boundaries of In<sub>2</sub>O<sub>3</sub> phases, which produced the drag effect of grain boundary migration, then hindering the further growth of grains.</div></div>","PeriodicalId":267,"journal":{"name":"Ceramics International","volume":"50 23","pages":"Pages 49285-49292"},"PeriodicalIF":5.1,"publicationDate":"2024-09-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142664115","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-09-21DOI: 10.1016/j.ceramint.2024.09.279
Fatma Sezgi Eraslan, Burak Birol, Ridvan Gecu
Corrosion protection of metals is essential for a wide range of technological applications, and coating metal surfaces with protective materials is a commonly employed method to achieve this. Among these, TiO2 coatings are extensively used due to their excellent photocatalytic properties, their applications in sensing and solar cells, and enhancing the corrosion and wear resistance of metal surfaces. Recent advancements have focused on the incorporation of carbide particles, such as B4C, to further improve the performance of TiO2 coatings. In this study, TiO2 coatings containing 0–3.25 wt% B4C were applied to a 316 L stainless steel substrates using the sol-gel method. The coatings were characterized by XRD and SEM-EDS analyses, and their wear and corrosion properties were evaluated using ball-on-disc wear tests and corrosion tests in NaCl solutions. The results demonstrated that lower concentrations of B4C led to improved wear resistance, likely due to the formation of a durable tribolayer, while higher concentrations reduced the wear resistance, attributed to increased oxidation and the formation of brittle phases. Corrosion resistance was enhanced in coatings containing 0.25 wt% and 1.25 wt% B4C, which can be attributed to the formation of protective B2O3 phases. However, at higher B4C concentrations, the corrosion rate increased, primarily due to the presence of cracks in the coating structure. Overall, the addition of 0.25 wt% B4C to the TiO2 coating significantly improved wear and corrosion resistance, indicating its potential as an effective additive for protective coatings.
{"title":"Microstructural, tribological, and corrosion behavior of B4C-added TiO2 coatings applied on 316 L stainless steel via sol-gel method","authors":"Fatma Sezgi Eraslan, Burak Birol, Ridvan Gecu","doi":"10.1016/j.ceramint.2024.09.279","DOIUrl":"10.1016/j.ceramint.2024.09.279","url":null,"abstract":"<div><div>Corrosion protection of metals is essential for a wide range of technological applications, and coating metal surfaces with protective materials is a commonly employed method to achieve this. Among these, TiO<sub>2</sub> coatings are extensively used due to their excellent photocatalytic properties, their applications in sensing and solar cells, and enhancing the corrosion and wear resistance of metal surfaces. Recent advancements have focused on the incorporation of carbide particles, such as B<sub>4</sub>C, to further improve the performance of TiO<sub>2</sub> coatings. In this study, TiO<sub>2</sub> coatings containing 0–3.25 wt% B<sub>4</sub>C were applied to a 316 L stainless steel substrates using the sol-gel method. The coatings were characterized by XRD and SEM-EDS analyses, and their wear and corrosion properties were evaluated using ball-on-disc wear tests and corrosion tests in NaCl solutions. The results demonstrated that lower concentrations of B<sub>4</sub>C led to improved wear resistance, likely due to the formation of a durable tribolayer, while higher concentrations reduced the wear resistance, attributed to increased oxidation and the formation of brittle phases. Corrosion resistance was enhanced in coatings containing 0.25 wt% and 1.25 wt% B<sub>4</sub>C, which can be attributed to the formation of protective B<sub>2</sub>O<sub>3</sub> phases. However, at higher B<sub>4</sub>C concentrations, the corrosion rate increased, primarily due to the presence of cracks in the coating structure. Overall, the addition of 0.25 wt% B<sub>4</sub>C to the TiO<sub>2</sub> coating significantly improved wear and corrosion resistance, indicating its potential as an effective additive for protective coatings.</div></div>","PeriodicalId":267,"journal":{"name":"Ceramics International","volume":"50 23","pages":"Pages 49346-49353"},"PeriodicalIF":5.1,"publicationDate":"2024-09-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142664350","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-09-21DOI: 10.1016/j.ceramint.2024.09.280
Gongxian Yang , Bin Zou , Xinfeng Wang , Yifan Hu , Lei Li , Xingguo Zhou , Qingguo Lai , Chuanzhen Huang
To obtain Mn-Zn ferrite magnetic ceramic parts with good densification and magnetic properties, a study was conducted. Mn-Zn ferrite magnetic ceramic parts with a solid particle content of 58 vol% were prepared using stereolithography (SLA). The SLA-cured ceramic blanks were degreased and sintered. The degreasing process for Mn-Zn ferrite parts was optimized using a direct heat degreasing method, resulting in a suitable process for the ferrite magnetic ceramic paste system. The method of liquid phase sintering is proposed for sintering the degreased ferrite parts. The study investigated the impact of the content of accelerant, sintering temperature, and holding time on the density and magnetic properties of Mn-Zn ferrite parts. The optimal parameters were found to be a firing aid content of 3 wt%, a sintering temperature of 900 °C, and a holding time of 90 min. Under these conditions, the parts exhibited a density of 4.43 g/cm3, densification of 91.4 %, saturation magnetization strength of 64 emu/g, and coercivity of 10 Oe. Finally, the sintering control mechanism of SLA-printed ferrite magnetic ceramics was analyzed. The study revealed the grain growth process and magnetization principle of Mn-Zn ferrite during liquid phase sintering. This research provides guidance for the subsequent photocuring printing and degreasing sintering of Mn-Zn ferrite ceramics. Additionally, Mn-Zn ferrite magnetic ceramic parts prepared by the SLA method also hold a wide application prospect in various precision electronic components.
{"title":"Study on liquid-phase sintering and magnetic properties of SLA-printed Mn-Zn ferrite ceramics","authors":"Gongxian Yang , Bin Zou , Xinfeng Wang , Yifan Hu , Lei Li , Xingguo Zhou , Qingguo Lai , Chuanzhen Huang","doi":"10.1016/j.ceramint.2024.09.280","DOIUrl":"10.1016/j.ceramint.2024.09.280","url":null,"abstract":"<div><div>To obtain Mn-Zn ferrite magnetic ceramic parts with good densification and magnetic properties, a study was conducted. Mn-Zn ferrite magnetic ceramic parts with a solid particle content of 58 vol% were prepared using stereolithography (SLA). The SLA-cured ceramic blanks were degreased and sintered. The degreasing process for Mn-Zn ferrite parts was optimized using a direct heat degreasing method, resulting in a suitable process for the ferrite magnetic ceramic paste system. The method of liquid phase sintering is proposed for sintering the degreased ferrite parts. The study investigated the impact of the content of accelerant, sintering temperature, and holding time on the density and magnetic properties of Mn-Zn ferrite parts. The optimal parameters were found to be a firing aid content of 3 wt%, a sintering temperature of 900 °C, and a holding time of 90 min. Under these conditions, the parts exhibited a density of 4.43 g/cm<sup>3</sup>, densification of 91.4 %, saturation magnetization strength of 64 emu/g, and coercivity of 10 Oe. Finally, the sintering control mechanism of SLA-printed ferrite magnetic ceramics was analyzed. The study revealed the grain growth process and magnetization principle of Mn-Zn ferrite during liquid phase sintering. This research provides guidance for the subsequent photocuring printing and degreasing sintering of Mn-Zn ferrite ceramics. Additionally, Mn-Zn ferrite magnetic ceramic parts prepared by the SLA method also hold a wide application prospect in various precision electronic components.</div></div>","PeriodicalId":267,"journal":{"name":"Ceramics International","volume":"50 23","pages":"Pages 49354-49364"},"PeriodicalIF":5.1,"publicationDate":"2024-09-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142664351","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-09-21DOI: 10.1016/j.ceramint.2024.09.275
Zhi-Yuan Wei , Yao Cai , Feng-Guang Li , Hai-Ming Huang , Min Wang
Long lifetime of thermal barrier coatings (TBCs) is limited by the localized thermally grown oxide (TGO) accumulation. Herein, the heterogeneous multilayered delamination mechanism of TGO is revealed. TGO cracking preferentially occurs at the peak of bond coat due to mismatch and extends toward the flank region under TGO growth. The thinner sublayer after first delamination is mainly attributed to loss of ceramic constraint. The delamination accumulation increases the YSZ crack driving force and provides a fast propagation channel for YSZ crack to pass through TGO. These results provide a guidance for the development of advanced TBC with higher oxidation resistance.
{"title":"Heterogeneous multilayered delamination of thermally grown oxide accelerating spallation of thermal barrier coatings","authors":"Zhi-Yuan Wei , Yao Cai , Feng-Guang Li , Hai-Ming Huang , Min Wang","doi":"10.1016/j.ceramint.2024.09.275","DOIUrl":"10.1016/j.ceramint.2024.09.275","url":null,"abstract":"<div><div>Long lifetime of thermal barrier coatings (TBCs) is limited by the localized thermally grown oxide (TGO) accumulation. Herein, the heterogeneous multilayered delamination mechanism of TGO is revealed. TGO cracking preferentially occurs at the peak of bond coat due to mismatch and extends toward the flank region under TGO growth. The thinner sublayer after first delamination is mainly attributed to loss of ceramic constraint. The delamination accumulation increases the YSZ crack driving force and provides a fast propagation channel for YSZ crack to pass through TGO. These results provide a guidance for the development of advanced TBC with higher oxidation resistance.</div></div>","PeriodicalId":267,"journal":{"name":"Ceramics International","volume":"50 23","pages":"Pages 49300-49310"},"PeriodicalIF":5.1,"publicationDate":"2024-09-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142664333","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-09-21DOI: 10.1016/j.ceramint.2024.09.283
Xubing Wei , Shiqi Lu , Jiaqing Ding , Shihao Zheng , Zan Chen , Junjie Lu , Zhengyu Liu , Pingmei Yin , Naizhou Du , Weibo Yang , Haiyan Feng , Guangan Zhang , Xiaowei Li
In this study, a novel periodic multilayered DLC coating, which was composed of a Si interlayer and a Si/N co-incorporated DLC layer (Si/(Si, N)-DLC) per period, was deposited; the corrosion behavior under the neutral, acidic, or alkaline coal mine water environment and its periodic number dependence, especially the fundamental corrosion mechanism, were systemically explored. Results suggest that compare to the substrate, the introduction of multilayered Si/(Si, N)-DLC coating presents a dramatic enhancement in the corrosion resistance under coal mine water environment. However, with increasing the periodic number, the corrosion resistance of the multilayered coating strongly depends on the working environment, which exhibits an enhancement in neutral and alkaline environments while a degeneration in acidic environment. This is attributed to not only the prolongation of the corrosion path caused by the multilayered structure but also the formation of an insulating silicon oxide layer in neutral and alkaline environments. However, in acidic environments, the strong permeability of H+ with the smallest ionic radius easily infiltrates the inherent defects of the coating. This not only weakens the protective properties of the multilayer structure but also leads to hydrogen-induced cracking, ultimately diminishing corrosion resistance. These findings theoretically guide the development of the DLC coatings with excellent corrosion resistance for coal mine applications.
{"title":"Enhanced corrosion resistance of a novel periodic multilayered Si/(Si, N)-DLC coating against simulated coal mine water","authors":"Xubing Wei , Shiqi Lu , Jiaqing Ding , Shihao Zheng , Zan Chen , Junjie Lu , Zhengyu Liu , Pingmei Yin , Naizhou Du , Weibo Yang , Haiyan Feng , Guangan Zhang , Xiaowei Li","doi":"10.1016/j.ceramint.2024.09.283","DOIUrl":"10.1016/j.ceramint.2024.09.283","url":null,"abstract":"<div><div>In this study, a novel periodic multilayered DLC coating, which was composed of a Si interlayer and a Si/N co-incorporated DLC layer (Si/(Si, N)-DLC) per period, was deposited; the corrosion behavior under the neutral, acidic, or alkaline coal mine water environment and its periodic number dependence, especially the fundamental corrosion mechanism, were systemically explored. Results suggest that compare to the substrate, the introduction of multilayered Si/(Si, N)-DLC coating presents a dramatic enhancement in the corrosion resistance under coal mine water environment. However, with increasing the periodic number, the corrosion resistance of the multilayered coating strongly depends on the working environment, which exhibits an enhancement in neutral and alkaline environments while a degeneration in acidic environment. This is attributed to not only the prolongation of the corrosion path caused by the multilayered structure but also the formation of an insulating silicon oxide layer in neutral and alkaline environments. However, in acidic environments, the strong permeability of H<sup>+</sup> with the smallest ionic radius easily infiltrates the inherent defects of the coating. This not only weakens the protective properties of the multilayer structure but also leads to hydrogen-induced cracking, ultimately diminishing corrosion resistance. These findings theoretically guide the development of the DLC coatings with excellent corrosion resistance for coal mine applications.</div></div>","PeriodicalId":267,"journal":{"name":"Ceramics International","volume":"50 23","pages":"Pages 49385-49399"},"PeriodicalIF":5.1,"publicationDate":"2024-09-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142664354","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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