In this paper, we prepared Al2O3–ZrO2–SiB6 composite ceramics with excellent performance by introducing the second‐phase high‐strength healing agent SiB6 in zirconia‐toughened alumina system, artificially created cracks using Vickers hardness tester, investigated the effects of heat treatment temperature (600–1200°C) and time (0–300 min) on the microscopic morphology and bending strength of the ceramics, revealed the healing mechanism, and studied the oxidation resistance properties. It was found that the healing effect was better at heat treatment of 90 min at 700°C and 60 min at 800°C, and the flexural strength was restored to more than 95% of that of the smooth specimens in both cases. Crack repair was mainly achieved by the reaction of SiB6, ZrB2, and B4C with O2. Below 800°C, healing was mainly achieved by the reaction of SiB6 and B4C with O2, and the generated B2O3 and SiO2 migrated toward the crack to repair it. When the healing temperature is higher than 800°C, ZrB2 also reacts with oxygen to produce B2O3 and t‐ZrO2. It was found that the oxidation weight gain per unit area of the Al2O3–ZrO2–SiB6 ceramic composite at different temperatures was small, and it has excellent oxidation resistance.
{"title":"The crack‐healing behavior and oxidation resistance of Al2O3–ZrO2–SiB6 ceramic at 600–1200°C","authors":"Haopeng Cai, Kun Jiang, Lihua Gao, Yinglong Wei","doi":"10.1111/ijac.14889","DOIUrl":"https://doi.org/10.1111/ijac.14889","url":null,"abstract":"In this paper, we prepared Al<jats:sub>2</jats:sub>O<jats:sub>3</jats:sub>–ZrO<jats:sub>2</jats:sub>–SiB<jats:sub>6</jats:sub> composite ceramics with excellent performance by introducing the second‐phase high‐strength healing agent SiB<jats:sub>6</jats:sub> in zirconia‐toughened alumina system, artificially created cracks using Vickers hardness tester, investigated the effects of heat treatment temperature (600–1200°C) and time (0–300 min) on the microscopic morphology and bending strength of the ceramics, revealed the healing mechanism, and studied the oxidation resistance properties. It was found that the healing effect was better at heat treatment of 90 min at 700°C and 60 min at 800°C, and the flexural strength was restored to more than 95% of that of the smooth specimens in both cases. Crack repair was mainly achieved by the reaction of SiB<jats:sub>6</jats:sub>, ZrB<jats:sub>2</jats:sub>, and B<jats:sub>4</jats:sub>C with O<jats:sub>2</jats:sub>. Below 800°C, healing was mainly achieved by the reaction of SiB<jats:sub>6</jats:sub> and B<jats:sub>4</jats:sub>C with O<jats:sub>2</jats:sub>, and the generated B<jats:sub>2</jats:sub>O<jats:sub>3</jats:sub> and SiO<jats:sub>2</jats:sub> migrated toward the crack to repair it. When the healing temperature is higher than 800°C, ZrB<jats:sub>2</jats:sub> also reacts with oxygen to produce B<jats:sub>2</jats:sub>O<jats:sub>3</jats:sub> and t‐ZrO<jats:sub>2</jats:sub>. It was found that the oxidation weight gain per unit area of the Al<jats:sub>2</jats:sub>O<jats:sub>3</jats:sub>–ZrO<jats:sub>2</jats:sub>–SiB<jats:sub>6</jats:sub> ceramic composite at different temperatures was small, and it has excellent oxidation resistance.","PeriodicalId":13903,"journal":{"name":"International Journal of Applied Ceramic Technology","volume":null,"pages":null},"PeriodicalIF":2.1,"publicationDate":"2024-09-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142257762","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
A porous silicon carbide (SiC) ceramic filter was prepared at 1000°C using waste red mud (RM), SiC, pore‐forming agent, and catalyst. The influence of sintering temperature, RM content, and pore former on the mechanical performance and the porosity of porous ceramics were investigated, and based on the result optimal processing parameters were selected. The air and water permeability tests were carried out at room temperature. The stability of the ceramic filter under thermal shock and chemical treatment was investigated and corroded samples were characterized. The ceramic was prepared using optimized processing parameters obtained with a flexural strength of 65.36 MPa at a porosity of 30.15 vol.% and demonstrated good performance in terms of pure water flux, oil, and turbidity removal efficiency from industrial wastewater. The filtration and permeation results indicated that the SiC filter prepared in this study is suitable for various applications, particularly in the remediation of oil‐polluted water.
{"title":"Fabrication and characterization of silicon carbide ceramic filtration media via recycling of waste red mud","authors":"Nilanjan Santra, Tamal Ghosh, Nijhuma Kayal","doi":"10.1111/ijac.14908","DOIUrl":"https://doi.org/10.1111/ijac.14908","url":null,"abstract":"A porous silicon carbide (SiC) ceramic filter was prepared at 1000°C using waste red mud (RM), SiC, pore‐forming agent, and catalyst. The influence of sintering temperature, RM content, and pore former on the mechanical performance and the porosity of porous ceramics were investigated, and based on the result optimal processing parameters were selected. The air and water permeability tests were carried out at room temperature. The stability of the ceramic filter under thermal shock and chemical treatment was investigated and corroded samples were characterized. The ceramic was prepared using optimized processing parameters obtained with a flexural strength of 65.36 MPa at a porosity of 30.15 vol.% and demonstrated good performance in terms of pure water flux, oil, and turbidity removal efficiency from industrial wastewater. The filtration and permeation results indicated that the SiC filter prepared in this study is suitable for various applications, particularly in the remediation of oil‐polluted water.","PeriodicalId":13903,"journal":{"name":"International Journal of Applied Ceramic Technology","volume":null,"pages":null},"PeriodicalIF":2.1,"publicationDate":"2024-09-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142257764","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Roza Salehi Sadati, Hossein Eslami, Mohammad Rafienia, Mojtaba Ansari
The present study intends to establish biphasic composite scaffolds containing polycaprolactone/hydroxyapatite (PCL/HA) and PCL/barium titanate (PCL/BT) layers with improved mechanical and biological properties by preserving HA and tuning BT contents. The porous piezo‐biphasic scaffolds were fabricated, using extrusion three‐dimensional printer technology, and on the basis of the scanning electron microscopy results, a relative porosity of 210–250 µm was created. The presence of BT phase in the biphasic scaffolds was confirmed by X‐ray diffraction and Fourier transform infrared analyses. The printed biphasic composites demonstrate suitable mechanical strength compared to one containing only 35% PCL and 65% HA compositions, which had a strength of 2.5 MPa. However, the strength for 80% BT‐incorporated biphasic composite was almost 13.5 times higher than that of monolithic specimen. The measured output voltages for the scaffolds after being subjected to an electric field affirmed that adding BT nanoparticles in biphasic composites leads to an increase in the output voltage that was lower compared to the monolithic scaffold. The piezo‐biphasic scaffold containing 80% BT is found to possess the highest enhancement in cytocompatibility for MG63 cells with the survival rate of approximately 95%, rendering the PCL/HA–PCL/BT biphasic scaffolds promising candidates for bone regeneration.
{"title":"Piezo‐biphasic scaffold based on polycaprolactone containing BaTiO3 and hydroxyapatite nanoparticles using three‐dimensional printing for bone regeneration","authors":"Roza Salehi Sadati, Hossein Eslami, Mohammad Rafienia, Mojtaba Ansari","doi":"10.1111/ijac.14906","DOIUrl":"https://doi.org/10.1111/ijac.14906","url":null,"abstract":"The present study intends to establish biphasic composite scaffolds containing polycaprolactone/hydroxyapatite (PCL/HA) and PCL/barium titanate (PCL/BT) layers with improved mechanical and biological properties by preserving HA and tuning BT contents. The porous piezo‐biphasic scaffolds were fabricated, using extrusion three‐dimensional printer technology, and on the basis of the scanning electron microscopy results, a relative porosity of 210–250 µm was created. The presence of BT phase in the biphasic scaffolds was confirmed by X‐ray diffraction and Fourier transform infrared analyses. The printed biphasic composites demonstrate suitable mechanical strength compared to one containing only 35% PCL and 65% HA compositions, which had a strength of 2.5 MPa. However, the strength for 80% BT‐incorporated biphasic composite was almost 13.5 times higher than that of monolithic specimen. The measured output voltages for the scaffolds after being subjected to an electric field affirmed that adding BT nanoparticles in biphasic composites leads to an increase in the output voltage that was lower compared to the monolithic scaffold. The piezo‐biphasic scaffold containing 80% BT is found to possess the highest enhancement in cytocompatibility for MG63 cells with the survival rate of approximately 95%, rendering the PCL/HA–PCL/BT biphasic scaffolds promising candidates for bone regeneration.","PeriodicalId":13903,"journal":{"name":"International Journal of Applied Ceramic Technology","volume":null,"pages":null},"PeriodicalIF":2.1,"publicationDate":"2024-09-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142180344","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Guo‐rong Ji, Ming Feng, Huilan Hao, Yunfeng Gao, Baoshun Zhu, Yu‐ming Tian
In this study, varying amounts of MnO2 up to 5 wt.% were added to magnesium aluminate spinel (MA) bodies using a solid‐state sintering method at 1200–1600°C. The effect of MnO2 addition on the phase composition, microstructure, distribution of elements, and ionic valence of MA was investigated via X‐ray diffraction, scanning electron microscopy, energy‐dispersive spectroscopy, and X‐ray photoelectron spectroscopy, respectively. The results showed that Mg2+ ions in MA crystals were replaced by Mn2+ ions, resulting in the formation of the (Mg1‐xMnx)Al2O4 solid solution. The distorted crystal structures promoted the sintering reactions, and the mechanical characteristics of MA were greatly improved by the solid solution strengthening process. When the additive amount of MnO2 was 5 wt.% and the sintered temperature reached at 1600°C, excess manganese ions hardly dissolved into the lattice of MA. And these ions were only distributed at the grain boundaries of MgAl2O4, forming a “barrier” that hindered the migration and diffusion of particles, thereby suppressing the sintering process and weakening the mechanical strength of MA.
在本研究中，采用固态烧结法在 1200-1600°C 下向铝酸镁尖晶石（MA）体中添加了不同量的 MnO2，最高达 5 wt.%。通过 X 射线衍射、扫描电子显微镜、能量色散光谱和 X 射线光电子能谱分别研究了 MnO2 的添加对尖晶石镁体的相组成、微观结构、元素分布和离子价的影响。结果表明，MA 晶体中的 Mg2+ 离子被 Mn2+ 离子取代，形成了 (Mg1-xMnx)Al2O4 固溶体。扭曲的晶体结构促进了烧结反应，固溶强化过程大大改善了 MA 的力学特性。当 MnO2 的添加量为 5 wt.%、烧结温度达到 1600°C 时，过量的锰离子很难溶解到 MA 的晶格中。这些离子只分布在 MgAl2O4 的晶界上，形成了阻碍颗粒迁移和扩散的 "屏障"，从而抑制了烧结过程，削弱了 MA 的机械强度。
{"title":"The effect of MnO2 additive on the microstructure and mechanical properties of magnesium aluminate spinel","authors":"Guo‐rong Ji, Ming Feng, Huilan Hao, Yunfeng Gao, Baoshun Zhu, Yu‐ming Tian","doi":"10.1111/ijac.14907","DOIUrl":"https://doi.org/10.1111/ijac.14907","url":null,"abstract":"In this study, varying amounts of MnO<jats:sub>2</jats:sub> up to 5 wt.% were added to magnesium aluminate spinel (MA) bodies using a solid‐state sintering method at 1200–1600°C. The effect of MnO<jats:sub>2</jats:sub> addition on the phase composition, microstructure, distribution of elements, and ionic valence of MA was investigated via X‐ray diffraction, scanning electron microscopy, energy‐dispersive spectroscopy, and X‐ray photoelectron spectroscopy, respectively. The results showed that Mg<jats:sup>2+</jats:sup> ions in MA crystals were replaced by Mn<jats:sup>2+</jats:sup> ions, resulting in the formation of the (Mg<jats:sub>1‐</jats:sub><jats:italic><jats:sub>x</jats:sub></jats:italic>Mn<jats:italic><jats:sub>x</jats:sub></jats:italic>)Al<jats:sub>2</jats:sub>O<jats:sub>4</jats:sub> solid solution. The distorted crystal structures promoted the sintering reactions, and the mechanical characteristics of MA were greatly improved by the solid solution strengthening process. When the additive amount of MnO<jats:sub>2</jats:sub> was 5 wt.% and the sintered temperature reached at 1600°C, excess manganese ions hardly dissolved into the lattice of MA. And these ions were only distributed at the grain boundaries of MgAl<jats:sub>2</jats:sub>O<jats:sub>4</jats:sub>, forming a “barrier” that hindered the migration and diffusion of particles, thereby suppressing the sintering process and weakening the mechanical strength of MA.","PeriodicalId":13903,"journal":{"name":"International Journal of Applied Ceramic Technology","volume":null,"pages":null},"PeriodicalIF":2.1,"publicationDate":"2024-09-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142180359","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Amir Mohammad Nikookar, Seyed Amir Ghaffari, Hossein Sarpoolaky
In this study, we investigated the impact of polyethylene glycol, sodium carboxymethyl cellulose, and polyvinyl alcohol on the rheological behavior, printability, and mechanical/physical properties of 3D‐printed scaffolds for high‐temperature applications using SiC/clay ceramic paste. Employing the Direct Ink Writing method, varying concentrations of each polymer (PEG: 2.5%–10% weight, CMC: .6%–1.8% weight, PVA: .25%–1% weight) were incorporated into the composition. The resulting SiC/clay paste, with adjusted additive content, was used to 3D‐print scaffold structures through Direct Ink Writing. Sintering of clay‐bonded SiC samples were carried out at 1300°C for 1 h in an ambient atmosphere. The research revealed that altering the additive amounts significantly influenced the rheological behavior, mechanical properties, and physical characteristics of the printed specimens. Notably, the ideal properties with additive concentrations (10% wt PEG, 1% wt PVA, and .6% CMC) were identified, providing the best outcomes in terms of printability and firing results. High density samples with 2.09, 1.93, and 1.79 g/cm3, high compression strength of 20.82, 14.5 and 12.53 MPa with 32.26%, 42.5%, and 52.63% open porosity for samples containing PVA, CMC, and PEG modifiers were obtained, respectively. Additionally, the study led to the development of a high solid loading printable paste with an 80% weight.
{"title":"Investigating the effect of polymer additives on the rheology of SiC/clay paste for use in Direct Ink Writing method","authors":"Amir Mohammad Nikookar, Seyed Amir Ghaffari, Hossein Sarpoolaky","doi":"10.1111/ijac.14899","DOIUrl":"https://doi.org/10.1111/ijac.14899","url":null,"abstract":"In this study, we investigated the impact of polyethylene glycol, sodium carboxymethyl cellulose, and polyvinyl alcohol on the rheological behavior, printability, and mechanical/physical properties of 3D‐printed scaffolds for high‐temperature applications using SiC/clay ceramic paste. Employing the Direct Ink Writing method, varying concentrations of each polymer (PEG: 2.5%–10% weight, CMC: .6%–1.8% weight, PVA: .25%–1% weight) were incorporated into the composition. The resulting SiC/clay paste, with adjusted additive content, was used to 3D‐print scaffold structures through Direct Ink Writing. Sintering of clay‐bonded SiC samples were carried out at 1300°C for 1 h in an ambient atmosphere. The research revealed that altering the additive amounts significantly influenced the rheological behavior, mechanical properties, and physical characteristics of the printed specimens. Notably, the ideal properties with additive concentrations (10% wt PEG, 1% wt PVA, and .6% CMC) were identified, providing the best outcomes in terms of printability and firing results. High density samples with 2.09, 1.93, and 1.79 g/cm<jats:sup>3</jats:sup>, high compression strength of 20.82, 14.5 and 12.53 MPa with 32.26%, 42.5%, and 52.63% open porosity for samples containing PVA, CMC, and PEG modifiers were obtained, respectively. Additionally, the study led to the development of a high solid loading printable paste with an 80% weight.","PeriodicalId":13903,"journal":{"name":"International Journal of Applied Ceramic Technology","volume":null,"pages":null},"PeriodicalIF":2.1,"publicationDate":"2024-08-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142180345","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Xiaofan Sun, Xiaowu Chen, Min Tan, Yanmei Kan, Xihai Jin, Zhen Wang, Ning Liu, Jianbao Hu, Jinshan Yang, Shaoming Dong
The corrosion of SiCf/SiC composites in gas environment threatens their long‐term service in aeroengines as hot‐end structure components. Addition of corrosion‐resistant phases into SiC matrix is a potential strategy to improve the service performance of SiCf/SiC materials. Here, AlN added SiC ceramics were prepared by reactive melt infiltration, and the effect of AlN phase on the oxidation resistance of the ceramics was emphasized. The oxidation tests were performed in dry oxygen and water oxygen atmospheres at 1100°C–1300°C, respectively. The oxidation mechanism was discussed based on the microstructure evolution of the oxide layer. The results show that the oxide layer is composed of aluminum silicate glass and Al2O3 flakes dispersedly distributed in the glass phase. As the temperature rises, the oxide layer gradually grows and thickens. Finally, a smooth and dense protective layer could be formed on the surface of ceramics to resist oxidation. This study can provide a profound insight to construct SiCf/SiC composites with excellent oxidation resistance.
SiCf/SiC 复合材料在气体环境中的腐蚀威胁着其在航空发动机热端结构部件中的长期使用。在 SiC 基体中添加抗腐蚀相是改善 SiCf/SiC 材料服役性能的潜在策略。本文采用反应熔渗法制备了添加 AlN 的 SiC 陶瓷，并重点研究了 AlN 相对陶瓷抗氧化性的影响。氧化试验分别在 1100°C-1300°C 的干氧和水氧气氛中进行。根据氧化层的微观结构演变讨论了氧化机理。结果表明，氧化层由硅酸铝玻璃和分散分布在玻璃相中的 Al2O3 薄片组成。随着温度的升高，氧化层逐渐增大变厚。最后，陶瓷表面形成了光滑致密的保护层，从而起到抗氧化的作用。这项研究为构建具有优异抗氧化性的 SiCf/SiC 复合材料提供了深刻的启示。
{"title":"Oxidation behavior of SiC‐AlN ceramics exposed to dry oxygen and water oxygen environments at 1100–1300°C","authors":"Xiaofan Sun, Xiaowu Chen, Min Tan, Yanmei Kan, Xihai Jin, Zhen Wang, Ning Liu, Jianbao Hu, Jinshan Yang, Shaoming Dong","doi":"10.1111/ijac.14903","DOIUrl":"https://doi.org/10.1111/ijac.14903","url":null,"abstract":"The corrosion of SiC<jats:sub>f</jats:sub>/SiC composites in gas environment threatens their long‐term service in aeroengines as hot‐end structure components. Addition of corrosion‐resistant phases into SiC matrix is a potential strategy to improve the service performance of SiC<jats:sub>f</jats:sub>/SiC materials. Here, AlN added SiC ceramics were prepared by reactive melt infiltration, and the effect of AlN phase on the oxidation resistance of the ceramics was emphasized. The oxidation tests were performed in dry oxygen and water oxygen atmospheres at 1100°C–1300°C, respectively. The oxidation mechanism was discussed based on the microstructure evolution of the oxide layer. The results show that the oxide layer is composed of aluminum silicate glass and Al<jats:sub>2</jats:sub>O<jats:sub>3</jats:sub> flakes dispersedly distributed in the glass phase. As the temperature rises, the oxide layer gradually grows and thickens. Finally, a smooth and dense protective layer could be formed on the surface of ceramics to resist oxidation. This study can provide a profound insight to construct SiC<jats:sub>f</jats:sub>/SiC composites with excellent oxidation resistance.","PeriodicalId":13903,"journal":{"name":"International Journal of Applied Ceramic Technology","volume":null,"pages":null},"PeriodicalIF":2.1,"publicationDate":"2024-08-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142180356","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Qisong Li, Yifei Ma, Ao Li, Yanfeng Gao, Shaopei Jia, Qian Zhang, Xiaozhe Cheng, Zhixin Wang, Yunchao Mu, Quan Huang
To solve the problem that Si was volatile and dense Si/SiC ceramics were difficult to achieve by spark plasma sintering (SPS) under a low sintering temperature and pressure, three kinds of SiC powders were used for particle grading and then ball‐milled with different time to further change and regulate their particle size and morphology, and finally nearly dense Si/SiC ceramics were prepared by SPS. The effect of milling time on particle size, morphology, tap density, phase, and microstructure of the SiC powders, as well as on bulk density, microhardness, thermal conductivity, phase, and microstructure of the Si/SiC ceramic, was researched. When the mixed SiC powders were ball‐milled for 12 min, the bulk density, microhardness, and thermal conductivity of Si/SiC ceramic were 2.96 g/cm3, 22.95 GPa, and 152.84 W/(m K), respectively. Ball milling changed the particle gradation and micro‐powder morphology and then affected the powder particle stacking state. Forming continuous pore channels was conducive for the volatile liquid Si to flowing and filling pores in a short time, resulting in denser Si/SiC ceramics at a lower sintering temperature and pressure. This study was useful for the preparation of ceramics containing volatile liquid phase by SPS.
为了解决硅易挥发、低烧结温度和压力下火花等离子体烧结（SPS）难以制备出致密的 Si/SiC 陶瓷的问题，采用三种 SiC 粉末进行颗粒分级，然后用不同时间的球磨进一步改变和调节其粒度和形貌，最终用 SPS 制备出近乎致密的 Si/SiC 陶瓷。研究了研磨时间对 SiC 粉末的粒度、形貌、敲击密度、相和微观结构的影响，以及对 Si/SiC 陶瓷的体积密度、显微硬度、热导率、相和微观结构的影响。将混合碳化硅粉末球磨 12 分钟后，Si/SiC 陶瓷的体积密度、显微硬度和热导率分别为 2.96 g/cm3、22.95 GPa 和 152.84 W/(m K)。球磨改变了颗粒级配和微粉形态，进而影响了粉末颗粒的堆积状态。形成连续的孔道有利于挥发性液态 Si 在短时间内流动并填充孔隙，从而在较低的烧结温度和压力下获得致密的 Si/SiC 陶瓷。这项研究有助于利用 SPS 制备含有挥发性液相的陶瓷。
{"title":"Effect of the SiC powder microscopic morphology on properties of Si/SiC ceramics prepared by spark plasma sintering","authors":"Qisong Li, Yifei Ma, Ao Li, Yanfeng Gao, Shaopei Jia, Qian Zhang, Xiaozhe Cheng, Zhixin Wang, Yunchao Mu, Quan Huang","doi":"10.1111/ijac.14904","DOIUrl":"https://doi.org/10.1111/ijac.14904","url":null,"abstract":"To solve the problem that Si was volatile and dense Si/SiC ceramics were difficult to achieve by spark plasma sintering (SPS) under a low sintering temperature and pressure, three kinds of SiC powders were used for particle grading and then ball‐milled with different time to further change and regulate their particle size and morphology, and finally nearly dense Si/SiC ceramics were prepared by SPS. The effect of milling time on particle size, morphology, tap density, phase, and microstructure of the SiC powders, as well as on bulk density, microhardness, thermal conductivity, phase, and microstructure of the Si/SiC ceramic, was researched. When the mixed SiC powders were ball‐milled for 12 min, the bulk density, microhardness, and thermal conductivity of Si/SiC ceramic were 2.96 g/cm<jats:sup>3</jats:sup>, 22.95 GPa, and 152.84 W/(m K), respectively. Ball milling changed the particle gradation and micro‐powder morphology and then affected the powder particle stacking state. Forming continuous pore channels was conducive for the volatile liquid Si to flowing and filling pores in a short time, resulting in denser Si/SiC ceramics at a lower sintering temperature and pressure. This study was useful for the preparation of ceramics containing volatile liquid phase by SPS.","PeriodicalId":13903,"journal":{"name":"International Journal of Applied Ceramic Technology","volume":null,"pages":null},"PeriodicalIF":2.1,"publicationDate":"2024-08-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142180346","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The Knoop hardness (HK) and compression strength (σc) of 23 advanced ceramics were measured to determine if an overarching HK/σc relationship could be identified for ceramics, or if one exists for a specific class of ceramics, similar to the hardness/yield strength relationship (H/Y ≈ 3) identified by Tabor for metals. Compression strength was determined using a dumbbell‐shaped specimen that virtually eliminates the end splitting that occurs when cylinders or cuboids are tested and provides a more representative compression strength value. HK values were obtained over a range of indentation loads between 0.98 and 98N. Four HK values, HK2, load‐independent HK, the hardness from the proportional specimen resistance model, and a brittleness parameter, were obtained and plotted against compression strength. An overarching relationship could not be identified for ceramics in general and the only class of ceramics that had a consistent relationship was tungsten carbide/cobalt that had a HK/σc of approximately 2.5. The consistent relationship for the WC/Co materials is due to the cobalt plastically deforming during the loading processes, something that does not occur in the other ceramics evaluated.
{"title":"Does a relationship exist between hardness and compression strength for advanced ceramics?","authors":"Jeffrey J. Swab","doi":"10.1111/ijac.14893","DOIUrl":"https://doi.org/10.1111/ijac.14893","url":null,"abstract":"The Knoop hardness (HK) and compression strength (<jats:italic>σ</jats:italic><jats:sub>c</jats:sub>) of 23 advanced ceramics were measured to determine if an overarching HK/<jats:italic>σ</jats:italic><jats:sub>c</jats:sub> relationship could be identified for ceramics, or if one exists for a specific class of ceramics, similar to the hardness/yield strength relationship (H/Y ≈ 3) identified by Tabor for metals. Compression strength was determined using a dumbbell‐shaped specimen that virtually eliminates the end splitting that occurs when cylinders or cuboids are tested and provides a more representative compression strength value. HK values were obtained over a range of indentation loads between 0.98 and 98N. Four HK values, HK<jats:sub>2</jats:sub>, load‐independent HK, the hardness from the proportional specimen resistance model, and a brittleness parameter, were obtained and plotted against compression strength. An overarching relationship could not be identified for ceramics in general and the only class of ceramics that had a consistent relationship was tungsten carbide/cobalt that had a HK/<jats:italic>σ</jats:italic><jats:sub>c</jats:sub> of approximately 2.5. The consistent relationship for the WC/Co materials is due to the cobalt plastically deforming during the loading processes, something that does not occur in the other ceramics evaluated.","PeriodicalId":13903,"journal":{"name":"International Journal of Applied Ceramic Technology","volume":null,"pages":null},"PeriodicalIF":2.1,"publicationDate":"2024-08-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142180360","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Fiberboard (FB) is extensively utilized in heat‐insulating refractory materials owing to its lightweight nature and excellent resistance to high temperatures. Nevertheless, the inadequate mechanical properties and limited dimensional stability of FB hinder its further application. The vacuum filtration was utilized in this study to manufacture inorganically modified insulation FB, incorporating plus fiber/1260 fiber and silica sol as the primary constituents and sepiolite powder (HS) as the modifier. The experimental results show that the fabricated samples exhibited extremely high porosity (75.3%–90.2%) and low thermal conductivity (.063–.15 W m−1 K−1, 200–800°C). The fibers were arranged in a three‐dimensional structure, overlapping with each other, and the silica sol adhered to the fibers, forming a spatial mesh structure through cross‐linking. Importantly, the incorporation of HS was effective in controlling the agglomeration of the silica sol, leading to a more uniform distribution within the fibers. Additionally, the study found that the mechanical properties (high hardness (64–72 HA)) and high‐temperature durability of the FBs were enhanced due to the flocculant modification. This study highlights promising prospects for industrial applications and offers a cost‐effective admixture for modifying and preparing high‐performance FBs, which is expected to see broad adoption in thermal insulation and energy conservation applications.
纤维板（FB）因其轻质和出色的耐高温性能而被广泛应用于隔热耐火材料中。然而，纤维板机械性能的不足和有限的尺寸稳定性阻碍了它的进一步应用。本研究利用真空过滤法制造了无机改性隔热 FB，以 plus 纤维/1260 纤维和硅溶胶为主要成分，以海泡石粉末（HS）为改性剂。实验结果表明，制造出的样品具有极高的孔隙率（75.3%-90.2%）和较低的热导率（0.063-0.15 W m-1 K-1，200-800°C）。纤维呈三维结构排列，相互重叠，二氧化硅溶胶附着在纤维上，通过交联形成空间网状结构。重要的是，HS 的加入能有效控制硅溶胶的团聚，使其在纤维内的分布更加均匀。此外，研究还发现，由于絮凝剂的改性，FB 的机械性能（高硬度（64-72 HA））和高温耐久性都得到了提高。这项研究强调了工业应用的广阔前景，并为改性和制备高性能 FB 提供了一种具有成本效益的外加剂，有望在隔热和节能应用中得到广泛采用。
{"title":"Novel method of fabricating lightweight thermally insulation fibrous composites for energy saving","authors":"Danyang Qiu, Shujing Li, Yuanbing Li, Zhen Cai, Chengzhen Fu, ChangDong Wei","doi":"10.1111/ijac.14905","DOIUrl":"https://doi.org/10.1111/ijac.14905","url":null,"abstract":"Fiberboard (FB) is extensively utilized in heat‐insulating refractory materials owing to its lightweight nature and excellent resistance to high temperatures. Nevertheless, the inadequate mechanical properties and limited dimensional stability of FB hinder its further application. The vacuum filtration was utilized in this study to manufacture inorganically modified insulation FB, incorporating plus fiber/1260 fiber and silica sol as the primary constituents and sepiolite powder (HS) as the modifier. The experimental results show that the fabricated samples exhibited extremely high porosity (75.3%–90.2%) and low thermal conductivity (.063–.15 W m<jats:sup>−1</jats:sup> K<jats:sup>−1</jats:sup>, 200–800°C). The fibers were arranged in a three‐dimensional structure, overlapping with each other, and the silica sol adhered to the fibers, forming a spatial mesh structure through cross‐linking. Importantly, the incorporation of HS was effective in controlling the agglomeration of the silica sol, leading to a more uniform distribution within the fibers. Additionally, the study found that the mechanical properties (high hardness (64–72 HA)) and high‐temperature durability of the FBs were enhanced due to the flocculant modification. This study highlights promising prospects for industrial applications and offers a cost‐effective admixture for modifying and preparing high‐performance FBs, which is expected to see broad adoption in thermal insulation and energy conservation applications.","PeriodicalId":13903,"journal":{"name":"International Journal of Applied Ceramic Technology","volume":null,"pages":null},"PeriodicalIF":2.1,"publicationDate":"2024-08-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142180358","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The social progress, economic growth, and meteoric urbanization prompt the exploitation of available resources triggering the contagion of the biological and physical elements of the atmosphere irrationally causing global environmental pollution. Environmental contamination monitoring is a dire necessity. Although a number of technologies find mention in the literature for environmental remediation, however, environmental catalysis is an advanced steadily growing technique for pollution abatement. In this dimension, ceramic materials have turned heads due to their wide-scale application areas. Hitherto, research is being done on advanced ceramics to fabricate novel modules for energy storage applications, in designing green buildings, pollution rheostats, and environmental engineering. This article deals with the abatement of environmental contaminants by adopting various methodologies such as aerobic and anaerobic biological treatments, adsorption, chemical oxidation, membrane separation, photocatalysis, ozonation using the ceramic as precursor materials. The ceramic membranes are cost-effective, ecofriendly, efficacious, and green approach to obliterate toxins and harmful gases released in environment. Even though, limited literature is available on the abolition of harmful contaminants from air and soil using ceramic materials, an attempt has been made to present currently available data with best of our knowledge. This article will sensitize researchers to refabricate novel materials for environment sustainability.
{"title":"Ceramics as potential materials in pollution prevention and control","authors":"Poonam Pipil, Tapasya Tomer, Ritu Payal","doi":"10.1111/ijac.14902","DOIUrl":"10.1111/ijac.14902","url":null,"abstract":"<p>The social progress, economic growth, and meteoric urbanization prompt the exploitation of available resources triggering the contagion of the biological and physical elements of the atmosphere irrationally causing global environmental pollution. Environmental contamination monitoring is a dire necessity. Although a number of technologies find mention in the literature for environmental remediation, however, environmental catalysis is an advanced steadily growing technique for pollution abatement. In this dimension, ceramic materials have turned heads due to their wide-scale application areas. Hitherto, research is being done on advanced ceramics to fabricate novel modules for energy storage applications, in designing green buildings, pollution rheostats, and environmental engineering. This article deals with the abatement of environmental contaminants by adopting various methodologies such as aerobic and anaerobic biological treatments, adsorption, chemical oxidation, membrane separation, photocatalysis, ozonation using the ceramic as precursor materials. The ceramic membranes are cost-effective, ecofriendly, efficacious, and green approach to obliterate toxins and harmful gases released in environment. Even though, limited literature is available on the abolition of harmful contaminants from air and soil using ceramic materials, an attempt has been made to present currently available data with best of our knowledge. This article will sensitize researchers to refabricate novel materials for environment sustainability.</p>","PeriodicalId":13903,"journal":{"name":"International Journal of Applied Ceramic Technology","volume":null,"pages":null},"PeriodicalIF":1.8,"publicationDate":"2024-08-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142180361","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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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