International Journal of Applied Ceramic Technology最新文献

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Composition optimization of (Hf, Ta, Zr, Cr)C high‐entropy carbides for good oxidation resistance 优化（Hf、Ta、Zr、Cr）C 高熵碳化物的成分以获得良好的抗氧化性

IF 2.1 4区材料科学 Q2 MATERIALS SCIENCE, CERAMICS

International Journal of Applied Ceramic Technology

Pub Date : 2024-08-12 DOI: 10.1111/ijac.14891

Shuaijun Yang, Mei Wang, Yetong Lv, Huilin Sheng, Yexia Qin

Oxidation resistance is crucial to the potential applications of high‐entropy carbides (HECs) at elevated temperatures. Here, we realize the exploration of (Hf, Ta, Zr, Cr)C high‐entropy carbides (HEC‐TM, TM = Hf, Zr, Ta, and Cr) with good oxidation resistance by optimizing their compositions. To be specific, 21 kinds of HEC‐xTM (x = 0–25 mol%) samples are fabricated by a high‐throughput ultrafast high‐temperature sintering technique, followed by oxidation testing at 1673 K for 30 min. Among all the HEC samples, the as‐fabricated HEC‐0Zr samples are proved to possess the best oxidation resistance with an oxidation depth of only 53 µm. Further study on isothermal oxidation kinetics demonstrates that the as‐fabricated HEC‐0Zr samples follow a linear oxidation law. The good oxidation resistance of the as‐fabricated HEC‐0Zr samples is believed to result from the (Ta, Me)2O5 phase with a low melting point, which can promote the densification of the oxide layer. This research opens up a new way for efficiently discovering new HECs for extreme applications.

抗氧化性对于高熵碳化物（HECs）在高温下的潜在应用至关重要。在此，我们通过优化成分，探索了具有良好抗氧化性的（Hf、Ta、Zr、Cr）C 高熵碳化物（HEC-TM，TM = Hf、Zr、Ta 和 Cr）。具体而言，通过高通量超快高温烧结技术制备了 21 种 HEC-xTM （x = 0-25 mol%）样品，然后在 1673 K 下进行了 30 分钟的氧化测试。在所有 HEC 样品中，制备的 HEC-0Zr 样品的抗氧化性最好，氧化深度仅为 53 µm。对等温氧化动力学的进一步研究表明，迭代制造的 HEC-0Zr 样品遵循线性氧化定律。据信，"原样制造 "的 HEC-0Zr 样品之所以具有良好的抗氧化性，是因为（Ta，Me）2O5 相的熔点较低，可以促进氧化层的致密化。这项研究为有效发现极端应用领域的新型 HEC 开辟了一条新途径。

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引用次数: 0

Fabrication of Si3N4 ceramic balls by SPS method with SiC powder bed 利用碳化硅粉末床采用 SPS 法制造 Si3N4 陶瓷球

IF 1.8 4区材料科学 Q2 MATERIALS SCIENCE, CERAMICS

International Journal of Applied Ceramic Technology

Pub Date : 2024-08-07 DOI: 10.1111/ijac.14879

Zhen-Quan Liang, Jia-Ji Liang, Jun-Jie Yu, Pei-Bin Cai, Wei-Ming Guo, Hua-Tay Lin

Spark plasma sintering (SPS) is an ultrafast sintering method for the preparation of ceramics and ceramic composites with simple geometrical shapes, with the combined application of uniaxial pressure. This study aims to propose an SPS densification method for Si₃N₄ ceramic balls without necessitating alterations to tools and equipment. The Si₃N₄ ceramic balls intended for sintering are positioned within a SiC powder bed inside the conventional die used in SPS. The study systematically investigates the effects of presintering temperature (1400°C, 1500°C, and 1600°C) and SPS temperature (1600°C, 1700°C, and 1800°C) on the sphericity, relative density, phase composition, microstructure, and mechanical properties of Si₃N₄ ceramic balls. Experimental findings reveal that Si₃N₄ ceramic balls exhibiting an optimal combination of sphericity (0.94 ± 0.02), relative density (98.4%), and mechanical properties (Vickers hardness: 17.5 ± 0.4 GPa, fracture toughness: 6.4 ± 0.1 MPa·m^1/2) were successfully achieved at a pre-sintering temperature and SPS temperature of 1600°C, coupled with the use of a SiC powder bed and SPS method. Consequently, the SPS method demonstrates its capability to fabricate Si₃N₄ ceramic balls with excellent performance.

火花等离子烧结（SPS）是一种超快烧结方法，可结合单轴压力制备几何形状简单的陶瓷和陶瓷复合材料。本研究旨在为 Si3N4 陶瓷球提出一种无需改变工具和设备的 SPS 致密化方法。用于烧结的 Si3N4 陶瓷球被放置在用于 SPS 的传统模具内的 SiC 粉末床中。研究系统地探讨了烧结前温度（1400°C、1500°C 和 1600°C）和 SPS 温度（1600°C、1700°C 和 1800°C）对 Si3N4 陶瓷球的球度、相对密度、相组成、微观结构和机械性能的影响。实验结果表明，在 1600°C 的预烧结温度和 SPS 温度下，结合使用碳化硅粉末床和 SPS 方法，Si3N4 陶瓷球成功实现了球度（0.94 ± 0.02）、相对密度（98.4%）和机械性能（维氏硬度：17.5 ± 0.4 GPa，断裂韧性：6.4 ± 0.1 MPa-m1/2）的最佳组合。因此，SPS 方法证明了其制造性能优异的 Si3N4 陶瓷球的能力。

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引用次数: 0

A novel route to synthesize B6O powder via reaction between CaB6 and B2O3 通过 CaB6 和 B2O3 反应合成 B6O 粉末的新路线

IF 2.1 4区材料科学 Q2 MATERIALS SCIENCE, CERAMICS

International Journal of Applied Ceramic Technology

Pub Date : 2024-08-06 DOI: 10.1111/ijac.14886

Ya‐Long Wang, Xiao‐Hui Yang, Guo‐Hua Zhang

A novel approach was applied to synthesize B6O using CaB6 and B2O3 powders as reactants. CaB6 and B2O3 were reacted to generate B6O and CaB2O4 at 1573 K, and the by‐product CaB2O4 was removed by acid leaching. It was found that the samples prepared in this work were oxygen deficient (B6Ox, x ≈ .76–.77). The optimal molar ratio of CaB6 to B2O3 was determined to be 3:5, and excess B2O3 could not lead to a change in the value of oxygen occupancy. Scanning electron microscope images showed that regular holes similar to the morphologies of CaB6 particles were exhibited in the final samples, which could be explained by the diffusion of CaB6 during the reaction process.

以 CaB6 和 B2O3 粉末为反应物合成 B6O 的方法很新颖。CaB6 和 B2O3 在 1573 K 下反应生成 B6O 和 CaB2O4，副产物 CaB2O4 通过酸浸去除。结果发现，这项工作制备的样品缺氧（B6Ox，x ≈ .76-.77）。确定 CaB6 与 B2O3 的最佳摩尔比为 3:5，过量的 B2O3 不会导致氧占有率值的变化。扫描电子显微镜图像显示，最终样品中出现了与 CaB6 颗粒形态相似的规则孔洞，这可以解释为反应过程中 CaB6 的扩散。

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引用次数: 0

Thermal shock resistance of additively manufactured alumina 加成型氧化铝的抗热震性

IF 2.1 4区材料科学 Q2 MATERIALS SCIENCE, CERAMICS

International Journal of Applied Ceramic Technology

Pub Date : 2024-08-06 DOI: 10.1111/ijac.14887

Jamieson Brechtl, Marco C. Martinez, Bola Yoon, Joseph Cesarano, Edgar Lara‐Curzio, Kashif Nawaz

The mechanical behavior and cracking patterns of thermally‐shocked additively manufactured alumina were investigated. The flexural strength of test specimens that had been heated to temperatures ranging from 200°C to 1000°C and then rapidly quenched in water was determined at ambient temperature by four‐point bending. Results indicated that the surface cracking patterns had a multifractal structure and that an increase in the thermal shock temperature led to an increase in the density and uniformity of the crack network. The flexural strength results were analyzed with Weibull statistics, where the Weibull moduli for most of the thermal shock conditions tested were found to be statistically indistinguishable. It was also found that a significant decrease (∼50%) in flexural strength occurred for heating temperatures ≥300°C. The effect of the manufacturing method on cracking patterns is discussed, as well as the implication of the material behavior for practical applications of these materials.

研究了热冲击添加剂制造的氧化铝的机械行为和裂纹模式。在环境温度下，通过四点弯曲法测定了加热至 200°C 至 1000°C 的试样在水中快速淬火后的抗弯强度。结果表明，表面裂纹具有多分形结构，热冲击温度的升高导致裂纹网络的密度和均匀性增加。用 Weibull 统计法分析了抗弯强度结果，发现大多数热冲击条件下的 Weibull 模量在统计上没有区别。研究还发现，加热温度≥300°C 时，抗弯强度显著下降（∼50%）。讨论了制造方法对开裂模式的影响，以及材料行为对这些材料实际应用的影响。

引用次数: 0

Brazing mechanism and shear strength of SiAlON/WC‐Co joint using Ag–Cu–Ti active filler 使用银铜钛活性填料的 SiAlON/WC-Co 接头的钎焊机理和剪切强度

IF 2.1 4区材料科学 Q2 MATERIALS SCIENCE, CERAMICS

International Journal of Applied Ceramic Technology

Pub Date : 2024-08-06 DOI: 10.1111/ijac.14881

Yi Zhou, Yuan Liu, Jia‐Pei Chen, Wei‐Ming Guo, Si‐Chun Luo, Hua‐Tay Lin

This work investigated the formation mechanism and the effects of temperature on the microstructure and shear strength of vacuum‐brazed SiAlON ceramic/WC‐Co cemented carbide joints using an Ag–Cu–Ti active filler as the interlayer. The diffusion of Ti elements toward substrates and their subsequent reaction during the brazing process led to the formation of TiN, TiC, and Ti5Si3 phases, where the featured reaction layers were established. A continuous reaction layer of TiN in the SiAlON substrate side and TiC in the WC substrate side were formed. The ceramic phases (Ti5Si3 TiN, and TiC) were distributed in a brazed intermediate layer. The highest shear strength of the brazed joints obtained at 850°C was 325.28 ± 20.27 MPa, demonstrating the feasibility of the Ag–Cu–Ti active filler in producing robust joints.

这项研究探讨了以 Ag-Cu-Ti 活性填料为中间层的真空钎焊 SiAlON 陶瓷/WC-Co 硬质合金接头的形成机理以及温度对其微观结构和剪切强度的影响。在钎焊过程中，Ti 元素向基底的扩散及其随后的反应导致了 TiN、TiC 和 Ti5Si3 相的形成，并在这些相中形成了特征反应层。在 SiAlON 基材一侧形成了连续的 TiN 反应层，在 WC 基材一侧形成了 TiC 反应层。陶瓷相（Ti5Si3 TiN 和 TiC）分布在钎焊中间层中。在 850°C 时，钎焊接头的最高剪切强度为 325.28 ± 20.27 兆帕，这证明了 Ag-Cu-Ti 活性填料在生产坚固接头方面的可行性。

引用次数: 0

Strength comparison for fully dense zirconium diboride ceramics tested by different methods 采用不同方法测试的全致密二硼化锆陶瓷的强度比较

IF 2.1 4区材料科学 Q2 MATERIALS SCIENCE, CERAMICS

International Journal of Applied Ceramic Technology

Pub Date : 2024-08-06 DOI: 10.1111/ijac.14885

Darko Kosanović, Suzana Filipović, Isaak Trajković, Nina Obradović, Paul M. Brune, Gregory E. Hilmas, William G. Fahrenholtz

The strength of zirconium diboride ceramics was tested by three different methods, 3‐point flexure, 4‐point flexure, and compression. Nearly full‐density ceramics were obtained by hot pressing commercial ZrB2 powder with the addition of .5 wt.% carbon as a sintering aid. The thermal properties and hardness were studied for ZrB2 milled with ZrB2 and WC media. Based on phase purity and higher thermal conductivity, ZrB2 ceramics prepared from powders milled with ZrB2 media were selected for mechanical property studies. The strength in 3‐point flexure was 546 ± 55 MPa. The flexure strength was 476 ± 41 MPa in 4‐point bending, which was ∼20% higher than the previously reported value of 398 MPa for ZrB2 with similar grain sizes due to higher relative density and lower impurity contents. Compression testing was performed at room temperature, and the strength was 1110 ± 358 MPa. Finally, the fracture toughness of pure ZrB2 ceramics was determined by the chevron‐notched beam method to be 3.6 ± .7 MPa m1/2. The strength and fracture toughness values are higher than those previously published for ZrB2 ceramics and can be attributed to higher density and lower grain size. The strength‐limiting flaw sizes were comparable to the grain size, suggesting that porosity and impurity phases did not play a significant role in the strength of these ceramics.

二硼化锆陶瓷的强度测试采用了三种不同的方法：三点弯曲、四点弯曲和压缩。通过热压商用 ZrB2 粉末并添加 0.5 重量 % 的碳作为烧结助剂，获得了接近全密度的陶瓷。研究了使用 ZrB2 和 WC 介质研磨的 ZrB2 的热性能和硬度。基于相纯度和较高的热导率，选择了用 ZrB2 介质碾磨的粉末制备的 ZrB2 陶瓷进行机械性能研究。三点弯曲强度为 546 ± 55 兆帕。由于相对密度较高和杂质含量较低，4 点弯曲强度为 476 ± 41 兆帕，比之前报道的具有相似晶粒尺寸的 ZrB2 的 398 兆帕值高出 20%。压缩测试在室温下进行，强度为 1110 ± 358 兆帕。最后，纯 ZrB2 陶瓷的断裂韧性是通过雪佛龙缺口梁法测定的，为 3.6 ± .7 MPa m1/2。强度和断裂韧性值高于之前公布的 ZrB2 陶瓷值，这可归因于较高的密度和较低的晶粒尺寸。限制强度的缺陷大小与晶粒大小相当，这表明孔隙率和杂质相在这些陶瓷的强度中并不起重要作用。

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引用次数: 0

Effect of silicon carbide content on microstructure, physical and mechanical properties in vat photopolymerization of alumina 碳化硅含量对氧化铝槽式光聚合微观结构、物理和机械性能的影响

IF 2.1 4区材料科学 Q2 MATERIALS SCIENCE, CERAMICS

International Journal of Applied Ceramic Technology

Pub Date : 2024-07-30 DOI: 10.1111/ijac.14877

Zhengyu Zhao, Hailong Wu, Anfu Guo, Dekun Kong, Lu Wang, Chang Liu, Lvfa Yin, Guojun Xia, Xiaofei Su

Vat photopolymerization (VPP) printing of ceramic parts offers advantages such as low cost, simple operation, and short fabrication cycles. However, drawbacks include low toughness and brittleness in the printed parts. This study explores enhancing the toughness and strength of alumina (Al2O3) ceramics by incorporating silicon carbide (SiC) particles as additives. The impact of varying SiC contents on the quality of VPP‐printed Al2O3 parts is examined, encompassing microstructure, physical properties, and mechanical properties. Results indicate that optimal SiC addition reduces Al2O3 ceramics' porosity, enhances crystalline quality, and boosts mechanical properties. Excessive SiC, however, diminishes these benefits. The most significant strengthening of Al2O3 parts occurred with a 1.5 wt.% SiC content, increasing bending strength and fracture toughness by 239.7% and 564.7%, respectively. This underscore SiC's positive role in enhancing the quality of VPP‐printed Al2O3 parts.

陶瓷部件的釜式光聚合（VPP）印刷具有成本低、操作简单、制造周期短等优点。然而，其缺点是印刷部件的韧性和脆性较低。本研究探讨了通过添加碳化硅（SiC）颗粒来提高氧化铝（Al2O3）陶瓷的韧性和强度。研究考察了不同碳化硅含量对 VPP 印刷 Al2O3 零件质量的影响，包括微观结构、物理性能和机械性能。结果表明，最佳的碳化硅添加量可降低 Al2O3 陶瓷的孔隙率，提高结晶质量，并增强机械性能。然而，过量的碳化硅会削弱这些优势。当 SiC 含量为 1.5 wt.% 时，Al2O3 部件的强化效果最为明显，弯曲强度和断裂韧性分别提高了 239.7% 和 564.7%。这凸显了 SiC 在提高 VPP 印刷 Al2O3 部件质量方面的积极作用。

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引用次数: 0

The oxidation resistance study of a novel quasi-molten coating for the prebaked anode 用于预焙阳极的新型准熔融涂层的抗氧化性研究

IF 1.8 4区材料科学 Q2 MATERIALS SCIENCE, CERAMICS

International Journal of Applied Ceramic Technology

Pub Date : 2024-07-29 DOI: 10.1111/ijac.14864

Pengcheng Hao, Xiaojun Lv, Zexun Han, Yongcong Wu, Xuan Tan

Air oxidation is the main cause of the excessive consumption of prebaked anodes, which not only wastes carbon resources but also increases carbon emissions. In this study, a quasi-molten coating with self-healing for prebaked anode by using the slurry method was proposed. This coating utilizes the viscous molten liquid phases to bond the carbon anode, absorbs thermal stress, insulates the carbon anode from the air, and provides self-healing capabilities at elevated temperatures, while the solid phase provides toughening properties. A series of oxidation experiments have shown that the coating has superior oxidation resistance than coatings reported in the literature.

空气氧化是造成预焙阳极消耗量过大的主要原因，这不仅浪费了碳资源，还增加了碳排放。本研究利用浆料法提出了一种预焙阳极自修复准熔融涂层。这种涂层利用粘性熔融液相粘合碳阳极，吸收热应力，使碳阳极与空气隔绝，并在高温下具有自修复功能，同时固相具有增韧特性。一系列氧化实验表明，该涂层的抗氧化性优于文献报道的涂层。

引用次数: 0

Preparation and characterization of foamed ceramics from silicomanganese and fluorgypsum waste 利用硅锰和氟石膏废料制备发泡陶瓷并确定其特性

IF 2.1 4区材料科学 Q2 MATERIALS SCIENCE, CERAMICS

International Journal of Applied Ceramic Technology

Pub Date : 2024-07-29 DOI: 10.1111/ijac.14850

Xiongwei Dong, Fenglan Han, Ning Li, Fuyuan Dong, Haipeng Liu, Yu Neng, Maohui Li

High‐strength foamed ceramics were synthesized employing silicon‐manganese slag (SM) and fluorgypsum (FG) as raw materials, with SiC serving as the foaming agent. Investigations into the influence of firing temperature and FG content on the phase structure, microstructure, and physical properties of foam ceramics were conducted. Characterization of the samples was performed through X‐ray diffraction and scanning electron microscopy. Results indicate that an increase in FG content lowers the matrix melting point, promotes crystal growth, enhances compressive strength, and forms a uniform pore structure. At an FG content of 11%, ceramics prepared at a firing temperature of 1130°C exhibit a density of 0.56 g/cm3, porosity of 78.45%, and compressive strength of 3.05 MPa. This study explores the use of FG as a cost‐effective alternative to borax, demonstrating a sustainable approach for foam ceramics preparation using silicomanganese slag and FG synergy.

以硅锰渣 (SM) 和氟石膏 (FG) 为原料，以 SiC 为发泡剂，合成了高强度泡沫陶瓷。研究了焙烧温度和 FG 含量对泡沫陶瓷的相结构、微观结构和物理性能的影响。通过 X 射线衍射和扫描电子显微镜对样品进行了表征。结果表明，增加 FG 含量可降低基体熔点，促进晶体生长，提高抗压强度，并形成均匀的孔隙结构。当 FG 含量为 11% 时，在 1130°C 烧制温度下制备的陶瓷密度为 0.56 g/cm3，孔隙率为 78.45%，抗压强度为 3.05 MPa。这项研究探讨了如何使用 FG 作为具有成本效益的硼砂替代品，展示了一种利用硅锰渣和 FG 协同作用制备泡沫陶瓷的可持续方法。

引用次数: 0

ZrB2‐based ultrahigh‐temperature ceramic with various SiC particle size: Microstructure, thermodynamical behavior, and mechanical properties 不同碳化硅粒度的 ZrB2 基超高温陶瓷：微观结构、热力学行为和力学性能

IF 2.1 4区材料科学 Q2 MATERIALS SCIENCE, CERAMICS

International Journal of Applied Ceramic Technology

Pub Date : 2024-07-27 DOI: 10.1111/ijac.14855

Elnaz Irom, Mohammad Zakeri, Mansour Razavi, Mohammad Farvizi

This study investigated the influences of WC and HfB2 additives along with SiC reinforcement (with various particle sizes) on densification, microstructure, and mechanical properties of ZrB2–SiC composites. The results showed that WC and HfB2 addition formed a solid solution of (Zr,W,Hf)B2 with a core–shell structure, whereas the remaining WC transformed into WB. Moreover, nano‐sized SiC caused a much better impact on densification compared to micro‐sized SiC. A small fraction of localized phases like ZrC, HfB, and (Hf,Zr)C in the form of solid solution were also formed. The maximum room temperature flexural strength and the fracture toughness of the sample containing 150 nm SiC and 8.9 wt.% WB were measured to be 682 17 MPa and 6.5 .3 MPa m1/2, respectively.

本研究探讨了 WC 和 HfB2 添加剂以及 SiC 增强材料（不同粒度）对 ZrB2-SiC 复合材料的致密化、微观结构和力学性能的影响。结果表明，添加的 WC 和 HfB2 形成了具有核壳结构的 (Zr,W,Hf)B2 固溶体，而剩余的 WC 则转化为 WB。此外，与微小尺寸的 SiC 相比，纳米尺寸的 SiC 对致密化的影响更大。此外，还形成了一小部分固溶体形式的局部相，如 ZrC、HfB 和 (Hf,Zr)C。经测量，含有 150 nm SiC 和 8.9 wt.% WB 的样品的最大室温抗折强度和断裂韧性分别为 682 17 MPa 和 6.5 .3 MPa m1/2。

引用次数: 0

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