Open Ceramics最新文献_第3页

Eco-friendly fabrication of ZnO-TiO2-rGO nanocomposite for efficient adsorption-assisted organic dyes elimination 以环保方式制备 ZnO-TiO2-rGO 纳米复合材料，用于高效吸附辅助去除有机染料

IF 2.9 Q1 MATERIALS SCIENCE, CERAMICS

Open Ceramics

Pub Date : 2024-10-02 DOI: 10.1016/j.oceram.2024.100691

Md Elias , Ehsanur Rahman , Sonia Akter , Mohammad Awlad Hossain , Rumana A. Jahan , Md Nizam Uddin , Shakhawat H. Firoz

The growing interest in combining the photocatalytic properties of semiconductors like ZnO and TiO₂ with the superior electron conduction capabilities of graphene has resulted in the successful synthesis of in-situ reduced graphene oxide (rGO) supported ZnO-TiO₂ nanostructures through a simple microwave-assisted synthesis method. X-ray Diffraction Spectroscopy (XRD), Field Emission Scanning Electron Microscope (FESEM), UV–visible spectroscopy (UV–vis), and Fourier Transform Infrared Spectroscopy (FTIR) were employed to characterize structural, morphological and optical properties as well as surface functional groups of the synthesized products. The XRD measurements of our synthesized samples confirm both structural crystallinity and phase purity, while the FTIR analysis verifies the complete reduction of graphene oxide (GO) to reduced graphene oxide (rGO). The synthesized ternary nanocomposite ZnO-TiO₂-rGO exhibited a remarkable 100 % adsorption-assisted removal efficiency for 20 mg/L methylene blue (MB) dye under ultraviolet light illumination within 120 min, along with a 56 % dye adsorption removal efficiency in the same time interval. In comparison, pure ZnO showed 0 % adsorption and only 31 % photocatalytic efficiency at the similar condition. Remarkably, the ZnO-TiO₂-rGO nanocomposite exhibited exceptional photocatalytic activity mediated by adsorption, achieving complete degradation of MB dye within 5 min under sunlight irradiation. The photocatalytic efficiency and dye adsorption capacity were found to be significantly lower for the anionic dye methyl orange (MO) compared to the cationic MB dye. The study thoroughly investigated the influence of catalyst dose and initial dye concentration on photodegradation. The proposed mechanism indicates that the extensive surface area and numerous active sites on the rGO promote adsorption, which is then followed by degradation through the metal oxides. Overall, the results unveil that the microwave-assisted synthesis of ZnO-TiO₂-rGO nanocomposite is a promising and environmentally friendly approach for efficiently degrading dyes from contaminated wastewater using both UV light and natural sunlight irradiation.

人们对将氧化锌和二氧化钛等半导体的光催化特性与石墨烯的卓越电子传导能力相结合的兴趣与日俱增，因此通过一种简单的微波辅助合成方法，成功合成了原位还原氧化石墨烯（rGO）支撑的氧化锌-二氧化钛纳米结构。我们采用了 X 射线衍射光谱（XRD）、场发射扫描电子显微镜（FESEM）、紫外可见光谱（UV-vis）和傅立叶变换红外光谱（FTIR）来表征合成产物的结构、形态和光学性质以及表面官能团。对合成样品的 XRD 测量证实了其结构结晶性和相纯度，而傅立叶变换红外光谱分析则验证了氧化石墨烯（GO）完全还原为还原型氧化石墨烯（rGO）。合成的三元纳米复合材料 ZnO-TiO2-rGO 在紫外光照射下，120 分钟内对 20 mg/L 亚甲基蓝（MB）染料的吸附去除率达到 100%，在相同时间间隔内对染料的吸附去除率达到 56%。相比之下，纯氧化锌在类似条件下的吸附率为 0%，光催化效率仅为 31%。值得注意的是，ZnO-TiO2-rGO 纳米复合材料在吸附作用的介导下表现出优异的光催化活性，在阳光照射下 5 分钟内就能完全降解 MB 染料。研究发现，与阳离子甲基橙（MO）相比，阴离子甲基橙（MO）的光催化效率和染料吸附能力明显较低。研究深入探讨了催化剂剂量和初始染料浓度对光降解的影响。提出的机理表明，rGO 上广泛的表面积和众多的活性位点促进了吸附，然后通过金属氧化物进行降解。总之，研究结果表明，微波辅助合成 ZnO-TiO2-rGO 纳米复合材料是一种利用紫外线和自然光照射高效降解受污染废水中染料的有前途的环保方法。

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引用次数: 0

Vat photopolymerization of ultra-porous bioactive glass foams 超多孔生物活性玻璃泡沫的釜式光聚合反应

IF 2.9 Q1 MATERIALS SCIENCE, CERAMICS

Open Ceramics

Pub Date : 2024-09-30 DOI: 10.1016/j.oceram.2024.100690

Francesco Baino , Federico Gaido , Roberta Gabrieli , Dario Alidoost , Alessandro Schiavi , Mehdi Mohammadi , Martin Schwentenwein , Dilshat Tulyaganov , Enrica Verné

The introduction of additive manufacturing technologies in the field of biomaterials science has opened new horizons for regenerative medicine. In this work, we pushed the potential of vat polymerization to the limit for fabricating ultra-porous bioactive SiO₂-CaO-MgO-P₂O₅-CaF₂-Na₂O glass scaffolds with bone-like architectural characteristics. The tomographic reconstruction of an open-cell foam was used as input file to the printing system and reliably reproduced in all its exquisite details, as assessed by morphological analyses of sintered scaffolds (thickness of single struts 35 μm, exceptionally high porosity around 94 vol%, most pores with size from 500 to 900 μm). Immersion studies in simulated body fluid (SBF) revealed the apatite-forming ability (i.e., in vitro bioactivity) of the scaffolds, the surface of which started being coated by calcium phosphate after just 3 days from the beginning of the experiments. Taken together, these results show great promise for application of such scaffolds in bone defect repair.

在生物材料科学领域引入增材制造技术为再生医学开辟了新天地。在这项工作中，我们将大桶聚合的潜力发挥到了极致，制造出了具有类骨结构特征的超多孔生物活性 SiO2-CaO-MgO-P2O5-CaF2-Na2O 玻璃支架。开孔泡沫的层析重建被用作打印系统的输入文件，并通过烧结支架的形态分析（单个支柱的厚度为 35 μm，孔隙率极高，约为 94%，大多数孔的大小为 500 至 900 μm）可靠地再现了其所有精致的细节。在模拟体液（SBF）中进行的浸泡研究显示了支架的磷灰石形成能力（即体外生物活性），从实验开始到现在，仅用了 3 天时间，支架表面就开始被磷酸钙包覆。综上所述，这些结果表明这种支架在骨缺损修复中的应用前景广阔。

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引用次数: 0

Ion-exchange enhancement of borosilicate glass vials for pharmaceutical packaging 增强药品包装用硼硅玻璃瓶的离子交换性能

IF 2.9 Q1 MATERIALS SCIENCE, CERAMICS

Open Ceramics

Pub Date : 2024-09-30 DOI: 10.1016/j.oceram.2024.100689

Ahmed Gamal Abd-Elsatar , Hamada Elsayed , Hana Kanková , Branislav Hruška , Jozef Kraxner , Enrico Bernardo , Dušan Galusek

Pharmaceutical containers for parenteral use, including vials, ampoules, prefilled syringes, and cartridges, are traditionally made of glass. However, the most commonly used type, borosilicate glass, is susceptible to issues such as breakage, corrosion, and delamination, which can jeopardize the safety and efficacy of the enclosed drugs. To address these concerns without compromising the visual or qualitative aspects of borosilicate medical glass vials, this study aimed at the enhancement of their mechanical, chemical, and corrosion resistance. A single ion exchange treatment (IET) in a salt bath of molten KNO₃ at temperatures of 400, 450, and 500 °C for 2, 12, and 24 h was applied. The effects of the ion exchange process performed under different conditions were assessed by measuring Vickers hardness, crushing load, and chemical durability. The mechanical load required to crush full-body vials after the ion exchange process at 500 °C for 2, 12, and 24 h showed an increase in the applied force values (1650 ± 80, 2340 ± 80, and 2325 ± 40 N) compared to untreated vials (1157 ± 20 N).

No radial cracks were observed on the surface of treated glass vials after indentation, indicating the presence of compressive stresses that prevented the initiation and propagation of cracks. The EDS analysis confirmed an increase in potassium concentration and a decrease in sodium content near the surface of samples modified by ion exchange treatment. The treated samples showed appropriate chemical stability in different acidic, basic, and neutral solutions. Conspicuous changes are noticed in the Raman spectra after IET, specifically in the Q_n species region. The results indicate the potential of the ion exchange treatment in enhancing the properties of borosilicate glass vials by relatively simple and easily scalable techniques.

肠外用药容器，包括小瓶、安瓿瓶、预灌装注射器和药筒，传统上都是由玻璃制成的。然而，最常用的硼硅酸盐玻璃容易出现破损、腐蚀和分层等问题，从而危及所装药物的安全性和有效性。为了在不影响硼硅医用玻璃瓶的外观和质量的前提下解决这些问题，本研究旨在增强其机械、化学和耐腐蚀性能。在 400、450 和 500 °C 的熔融 KNO3 盐浴中分别进行了 2、12 和 24 小时的离子交换处理（IET）。通过测量维氏硬度、压碎负荷和化学耐久性，评估了在不同条件下进行离子交换处理的效果。与未处理的玻璃瓶（1157 ± 20 N）相比，在 500 °C、2、12 和 24 小时的离子交换过程后，压碎全身玻璃瓶所需的机械载荷显示作用力值有所增加（1650 ± 80、2340 ± 80 和 2325 ± 40 N）。EDS 分析证实，经过离子交换处理的改性样品表面附近的钾浓度增加，钠含量减少。经过处理的样品在不同的酸性、碱性和中性溶液中表现出适当的化学稳定性。经离子交换处理后，拉曼光谱发生了明显变化，特别是在 Qn 物种区域。这些结果表明，离子交换处理在通过相对简单和易于扩展的技术提高硼硅玻璃瓶的性能方面具有潜力。

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引用次数: 0

Synthesis of polycrystalline Ta₂O₅ inverse opal photonic crystal powders and their optical characterization 多晶 Ta₂O₅ 逆乳白光子晶体粉末的合成及其光学表征

IF 2.9 Q1 MATERIALS SCIENCE, CERAMICS

Open Ceramics

Pub Date : 2024-09-30 DOI: 10.1016/j.oceram.2024.100688

Taiki Maekawa , Hiroyuki Maekawa , Yuto Ikeda , Tomoya Onoe , Geoffrey I.N. Waterhouse , Kei-ichiro Murai , Toshihiro Moriga

Polycrystalline Ta₂O₅ inverse opal (IO) photonic crystal powders were synthesized using PMMA colloidal crystals as sacrificial templates. We prepared Ta₂O₅ IO powders with vibrant structural colors at UV–vis wavelengths. The photonic bandgaps (PBGs) in the Ta₂O₅ IO powders red-shifted as a function of both the macropore diameter and the refractive index of the medium filling the macropores. Owing to their polycrystalline structure, the Ta₂O₅ IO powders exposed PBGs for various FCC facets, making investigation of their optical properties significantly more complex than Ta₂O₅ IO thin films that preferentially expose only (111) planes as studied previously. Due to the overlap of the PBGs from different FCC facets and the defects that cause light scattering, much of the typical angle-dependent structural color observed in IO thin films was lost in the Ta₂O₅ IO powders. This study offers new insights into the optical properties of IO powders.

以 PMMA 胶体晶体为牺牲模板合成了多晶 Ta2O5 反蛋白石（IO）光子晶体粉末。我们制备的 Ta2O5 IO 粉末在紫外可见光波长下具有鲜艳的结构颜色。Ta2O5 IO 粉末中的光子带隙 (PBG) 随大孔直径和填充大孔的介质折射率的变化而发生红移。由于其多晶结构，Ta2O5 IO 粉末暴露出各种 FCC 面的 PBG，这使得对其光学特性的研究要比之前研究的只优先暴露出 (111) 面的 Ta2O5 IO 薄膜复杂得多。由于不同 FCC 面的 PBG 重叠以及导致光散射的缺陷，在 IO 薄膜中观察到的典型的随角度变化的结构颜色在 Ta2O5 IO 粉末中大部分都消失了。这项研究为了解 IO 粉末的光学特性提供了新的视角。

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引用次数: 0

Assessing the durability performance of geopolymer concrete utilizing fly ash and sugarcane bagasse ash as sustainable binders 评估利用粉煤灰和甘蔗渣灰作为可持续粘合剂的土工聚合物混凝土的耐久性能

IF 2.9 Q1 MATERIALS SCIENCE, CERAMICS

Open Ceramics

Pub Date : 2024-09-26 DOI: 10.1016/j.oceram.2024.100687

Mohammed Ali M. Rihan , Richard Ocharo Onchiri , Naftary Gathimba , Bernadette Sabuni

Geopolymer or alkali-activated binders are being recognized as an eco-friendly, sustainable substitute for ordinary Portland cement (OPC). The development of high-performance concrete with improved durability and mechanical properties and the addition of environmentally friendly components is a continuous effort. Therefore, the current work examines the durability of fly ash-sugarcane bagasse ash mechanical characteristics in terms of water absorption, exposure to elevated temperatures, and acid resistance. The mechanical properties of the geopolymer concrete (GPC) and OPC concrete specimens were evaluated after being subjected to elevated temperatures of 200 °C, 400 °C, 600 °C, and 800 °C. The acid resistance was determined by submerging the concrete specimens in 3 % sulfuric acid (H₂SO₄). The acid resistance of the specimens was evaluated through visual inspection, weight variation, and the percentage loss in compressive strength (C_R). According to the study, C_R typically drops as temperature increases from ambient temperature to 800 °C. However, the rate of decline reduced as temperature increased from ambient temperature to 200 °C. Moreover, the GPC specimens showed a strength loss between 13 % and 21 % following 28 days of sulfuric acid immersion. In contrast, exposure to sulfuric acid caused a 51 % drop in strength for the OPC concrete samples.

土工聚合物或碱活性粘结剂被认为是一种环保、可持续的普通硅酸盐水泥（OPC）替代品。开发具有更好耐久性和机械性能的高性能混凝土并添加环保成分是一项持续的工作。因此，目前的工作从吸水性、暴露于高温和耐酸性等方面研究了粉煤灰-甘蔗渣灰的耐久性机械特性。在 200 ℃、400 ℃、600 ℃ 和 800 ℃ 的高温条件下，对土工聚合物混凝土（GPC）和 OPC 混凝土试样的力学性能进行了评估。将混凝土试样浸没在 3% 的硫酸（H2SO4）中测定其耐酸性。通过目测、重量变化和抗压强度（CR）损失百分比来评估试样的耐酸性。研究表明，抗压强度通常会随着温度从环境温度升高到 800 °C 而下降。然而，随着温度从环境温度升高到 200 °C，下降率有所降低。此外，GPC 试样在硫酸浸泡 28 天后，强度下降了 13% 到 21%。相比之下，暴露在硫酸中会导致 OPC 混凝土试样强度下降 51%。

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引用次数: 0

Influences of additives on the properties of geopolymer matrix composites (GMCS) for high-temperature applications (1150 °C) 添加剂对高温应用（1150 ℃）土工聚合物基复合材料（GMCS）性能的影响

IF 2.9 Q1 MATERIALS SCIENCE, CERAMICS

Open Ceramics

Pub Date : 2024-09-21 DOI: 10.1016/j.oceram.2024.100685

Quentin Cligny , Ameni Gharzouni , Patrice Duport , Damien Brandt , Sylvie Rossignol

In this study, the influence of different additives on a geopolymer matrix composite (GMC) was explored as an alternative to a ceramic matrix composite (CMC) for thermostructural applications. Different GMCs using an N610 textile (10 × 10 cm²) and various additives (SrCO₃, BaCO₃, BaSO₄, MgO and Al₂O₃ and mullite-rich powder) were cured under 6 MPa at 120 °C for 2 h. The mechanical, microstructural and structural data of the composites were compared with those of the geopolymer matrix after thermal treatment at 1150 °C. The results showed that the addition of alkali-earth barium carbonate or sulfate to the geopolymer matrix facilitated the formation of alkali-earth aluminosilicate crystalline phases and a higher viscous flow apparition temperature (990 °C), which did not enhance its mechanical properties (50 MPa) due to poor impregnation of the textile. Refractory additives such as MgO and Al₂O₃ in the geopolymer matrix support fiber impregnation with a low-viscous-flow apparition temperature (865 °C) and the formation of crystalline phases such as forsterite, spinel and sapphirine, which act as reinforcements, allowing a flexural strength up to 80 MPa. The addition of a refractory compound, such as mullite, leads to better embedding of fibers and a flexural strength reaching 100 MPa. To conclude, mixing the geopolymer matrix with refractory compounds results in a successful thermo-structural geopolymer composite.

本研究探讨了不同添加剂对土工聚合物基复合材料（GMC）的影响，以替代热结构应用中的陶瓷基复合材料（CMC）。使用 N610 纺织品（10 × 10 cm2）和各种添加剂（SrCO3、BaCO3、BaSO4、MgO 和 Al2O3 以及富莫来石粉末）制成的不同 GMC 在 6 MPa 下于 120 °C 固化 2 小时。结果表明，在土工聚合物基体中添加碱土碳酸钡或硫酸钡可促进碱土铝硅酸盐结晶相的形成和更高的粘流显现温度（990 ℃），但由于纺织品浸渍效果不佳，并未提高其机械性能（50 兆帕）。土工聚合物基体中的氧化镁和氧化铝等耐火添加剂可支持纤维浸渍，使其具有较低的粘流显影温度（865 °C），并形成可作为增强材料的晶相，如方解石、尖晶石和蓝晶石，从而使抗弯强度达到 80 兆帕。添加莫来石等耐火化合物可更好地嵌入纤维，使抗弯强度达到 100 兆帕。总之，将土工聚合物基体与耐火化合物混合可成功制成热结构土工聚合物复合材料。

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引用次数: 0

The sound of porosity: Suitability of the impulse excitation technique (IET) to determine the Young's modulus of 2D macroporous ceramics 多孔性的声音：脉冲激励技术（IET）测定二维大孔陶瓷杨氏模量的适用性

IF 2.9 Q1 MATERIALS SCIENCE, CERAMICS

Open Ceramics

Pub Date : 2024-09-21 DOI: 10.1016/j.oceram.2024.100686

Tim Stötzel , Swantje Funk , Tobias Fey

The presence of pores in a ceramic leads to a lower Young's modulus compared to dense material. For the development of porous ceramics with tailored elastic properties, an exact determination of the Young's modulus is required, especially for industrial applications. Therefore, we investigated the suitability of the non-destructive impulse excitation technique for measuring the dynamic Young's modulus of two-dimensional ceramics with low porosity (P < 19 %). For rectangular samples it was shown that the measurement results depend on the geometric pore position, as added pores outside the nodal lines of the fundamental flexural vibration had no influence on the result. Pores in the inner part of the sample led to a decrease of the Young's modulus that is in good agreement with empirical and analytical models. For the investigated interval of porosity range, the influence of pore size and geometric position on the reduction of the Young's modulus was determined.

与致密材料相比，陶瓷中孔隙的存在会导致较低的杨氏模量。为了开发具有定制弹性特性的多孔陶瓷，需要精确测定杨氏模量，尤其是在工业应用中。因此，我们研究了非破坏性脉冲激励技术是否适用于测量低孔隙率（P < 19 %）二维陶瓷的动态杨氏模量。对于矩形样品，测量结果取决于孔隙的几何位置，因为在基本挠曲振动节点线外增加的孔隙对测量结果没有影响。样品内部的孔隙会导致杨氏模量下降，这与经验模型和分析模型十分吻合。在所研究的孔隙率范围内，确定了孔隙大小和几何位置对杨氏模量降低的影响。

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引用次数: 0

Colloidal route towards sodium ionic conductor (NASICON) 3D complex solid electrolyte structures fabricated by direct ink writing (DIW) 通过直接墨水写入（DIW）制造钠离子导体（NASICON）三维复合固体电解质结构的胶体路线

IF 2.9 Q1 MATERIALS SCIENCE, CERAMICS

Open Ceramics

Pub Date : 2024-09-19 DOI: 10.1016/j.oceram.2024.100683

Oxel Urra , B. Ferrari , A.J. Sanchez-Herencia , Giorgia Franchin , Paolo Colombo

Progressing towards a sustainable energy model, safer new generation high-performance energy storage devices with large energy density and power are needed. In this sense, the improvement in terms of efficiency and sustainability has led to the interest in solid-state batteries (SSBs). Lately, sodium-ion batteries (SIBs) have become an emerging alternative due to the abundance of raw materials, low cost, and improvements in terms of fast sodium-ion conductor solid electrolytes (SCSEs). Among all the SCSEs, the sodium superionic conductor (NASICON) type electrolyte is one of the most well-known electrolytes, being widely developed in terms of synthesis and materials. However, the processing and manufacturing of these electrolytes have gone almost unnoticed, without considering that well-designed structures of electrodes/electrolytes are the bridge toward turning advanced energy materials into high-performance devices. This work presents the fabrication of 3D complex structures based on NASICON sodium solid electrolytes, obtained for the first time by direct ink writing (DIW). Through a colloidal route, fine NASICON phase powder with high pureness was prepared, enabling the manufacturing of intricate NASICON-printed electrolytes in a one-step fabrication process. By optimizing the ink, a dense electrolyte layer, acting as an ionic conductor and separator, was inserted between two complex porous pattern layers obtaining a device with a total height below 1.15 mm. Further, the densification of the 3D electrolyte was enhanced, reaching high ionic conductivities at room temperature (3.10⁻⁴ S cm⁻¹). Thus, a high-performance sodium ion conductor NASICON solid electrolyte with shorter diffusion pathways and larger interfacial surface areas between electrode/electrolyte was obtained, improving the overall electrochemical performance of the device by a 3D layer-by-layer design.

为实现可持续能源模式，需要更安全、能量密度更大、功率更强的新一代高性能储能设备。从这个意义上说，固态电池（SSBs）在效率和可持续性方面的改进引起了人们的兴趣。最近，钠离子电池（SIB）由于原材料丰富、成本低廉以及钠离子导体固体电解质（SCSE）的改进而成为一种新兴的替代品。在所有 SCSE 中，钠超离子导体（NASICON）型电解质是最著名的电解质之一，在合成和材料方面得到了广泛开发。然而，这些电解质的加工和制造几乎没有引起人们的注意，没有考虑到精心设计的电极/电解质结构是将先进能源材料转化为高性能设备的桥梁。这项工作展示了基于 NASICON 固态钠电解质的三维复杂结构的制造，这是首次通过直接墨水写入（DIW）技术获得的。通过胶体路线，制备出了高纯度的精细 NASICON 相粉末，从而实现了一步法制造复杂的 NASICON 印刷电解质。通过优化油墨，在两个复杂的多孔图案层之间插入了致密的电解质层，该电解质层既是离子导体，又是隔离层，从而获得了总高度低于 1.15 毫米的装置。此外，三维电解质的致密性也得到了提高，在室温下达到了很高的离子电导率（3.10-4 S cm-1）。因此，通过三维逐层设计，获得了一种具有更短扩散途径和更大电极/电解质界面表面积的高性能钠离子导体 NASICON 固体电解质，提高了器件的整体电化学性能。

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引用次数: 0

Characterization of (Zr,Ti)B2-SiC composites obtained by hot press sintering of ZrB2-SiC-TiO2 powder mixtures 通过热压烧结 ZrB2-SiC-TiO2 粉末混合物获得的 (Zr,Ti)B2-SiC 复合材料的表征

IF 2.9 Q1 MATERIALS SCIENCE, CERAMICS

Open Ceramics

Pub Date : 2024-09-19 DOI: 10.1016/j.oceram.2024.100684

Rosa Maria da Rocha , Francisco Cristovão Lourenço de Melo , Frank Ferrer Sene , João Marcos Kruszynski de Assis , Miriam Kasumi Hwang Yassuda

The ability to enhance mechanical and oxidation properties for severe environmental applications has led to substantial academic interest in multiphase ultra-high temperature ceramics (UHTC). The purpose of this work is to study the in-situ solid solution formation of (Zr,Ti)B₂ from ZrB₂ and TiO₂ in a ZrB₂-SiC composite using hot pressing reaction sintering. For this, a mixture of 10, 20, and 30 % vol% SiC with ZrB₂ was mixed with 2.0 wt% TiO₂. Hot pressing sintering was performed with a load of 20 MPa at a final temperature of 1850 °C/30 min in an argon atmosphere. The microstructures, crystalline phases, densities, mechanical properties, and oxidation resistance of the composites were examined and compared with ZrB₂-SiC samples lacking TiO₂. In samples where TiO₂ was added, the matrix grain size slightly decreased, the fracture mode was mainly intergranular, and the SiC grain morphology changed the aspect ratio to be more equiaxed. The solid solution (Zr,Ti)B₂ was produced, and it was demonstrated by EDS elemental map images and the XRD analysis that Ti atoms incorporate into the ZrB₂ crystalline structure. The development of solid solutions showed no impact on relative densities or Vickers hardness. However, the solid solution formation favored an improvement in fracture toughness, probably owing to the smaller matrix grain size and intergranular fracture mode. Samples exhibiting (Zr,Ti)B₂ formation presented lower oxidation resistance than undoped samples in the same oxidizing condition.

多相超高温陶瓷（UHTC）能够增强严酷环境应用中的机械性能和氧化性能，因此引起了学术界的极大兴趣。这项研究的目的是利用热压反应烧结技术，研究 ZrB2 和 TiO2 在 ZrB2-SiC 复合材料中原位固溶形成 (Zr,Ti)B2。为此，将体积分数分别为 10%、20% 和 30% 的 SiC 与 ZrB2 的混合物与 2.0 wt% 的 TiO2 混合。热压烧结在氩气环境下进行，最终温度为 1850°C/30 分钟，载荷为 20 兆帕。对复合材料的微观结构、晶相、密度、机械性能和抗氧化性进行了检测，并与不含 TiO2 的 ZrB2-SiC 样品进行了比较。在添加了 TiO2 的样品中，基体晶粒尺寸略有减小，断裂模式主要是晶间断裂，SiC 晶粒形态改变了长宽比，变得更加等轴。固溶体（Zr,Ti）B2 的产生，通过 EDS 元素图和 XRD 分析表明，Ti 原子融入了 ZrB2 结晶结构中。固溶体的形成对相对密度或维氏硬度没有影响。不过，固溶体的形成有利于提高断裂韧性，这可能是由于基体晶粒尺寸和晶间断裂模式较小的缘故。在相同的氧化条件下，形成（Zr,Ti）B2 的样品的抗氧化性低于未掺杂的样品。

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引用次数: 0

Industrial potential of additive manufacturing of transparent ceramics: A review 透明陶瓷增材制造的工业潜力：综述

IF 2.9 Q1 MATERIALS SCIENCE, CERAMICS

Open Ceramics

Pub Date : 2024-09-18 DOI: 10.1016/j.oceram.2024.100682

Andrea Volfi , Laura Esposito , Valentina Biasini , Andreana Piancastelli , Jan Hostaša

Transparent ceramics is a unique class of materials, with performance comparable to single crystals, but a high process flexibility given by ceramic technology. Currently, traditional ceramic shaping technologies reliably produce components but are limited in terms of shapes and the use of multiple compositions in a single component. The presented review aims to illustrate how the introduction of additive manufacturing (AM) technology in the production of transparent ceramic components opens new possibilities, both thanks to the high variability of shapes and thanks to the high precision in producing parts with a controlled variation of composition. Within this review, several AM techniques and their current state of the art are analysed, with focus on their advantages in producing transparent ceramics, along with the associated challenges and limitations. The future perspective and possibilities for an industrial production are discussed, with emphasis on the most promising AM techniques, direct ink writing and vat photopolymerisation, pointing out the future scenario for the transparent ceramics market.

透明陶瓷是一类独特的材料，其性能可与单晶体相媲美，但陶瓷技术赋予了其高度的工艺灵活性。目前，传统的陶瓷成型技术可以可靠地生产部件，但在形状和在单个部件中使用多种成分方面受到限制。本综述旨在说明在透明陶瓷部件的生产中引入快速成型（AM）技术是如何开辟新的可能性的，这既得益于形状的高可变性，也得益于在生产部件时对成分变化的高精度控制。在这篇综述中，分析了几种 AM 技术及其当前的技术水平，重点是它们在生产透明陶瓷方面的优势，以及相关的挑战和局限性。文章还讨论了工业化生产的未来前景和可能性，重点是最有前途的 AM 技术、直接墨水写入技术和大桶光聚合技术，并指出了透明陶瓷市场的未来前景。

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引用次数: 0