采用不同方法测试的全致密二硼化锆陶瓷的强度比较

IF 1.8 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
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引用次数: 0

摘要

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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Strength comparison for fully dense zirconium diboride ceramics tested by different methods
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.
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来源期刊
International Journal of Applied Ceramic Technology
International Journal of Applied Ceramic Technology 工程技术-材料科学:硅酸盐
CiteScore
3.90
自引率
9.50%
发文量
280
审稿时长
4.5 months
期刊介绍: The International Journal of Applied Ceramic Technology publishes cutting edge applied research and development work focused on commercialization of engineered ceramics, products and processes. The publication also explores the barriers to commercialization, design and testing, environmental health issues, international standardization activities, databases, and cost models. Designed to get high quality information to end-users quickly, the peer process is led by an editorial board of experts from industry, government, and universities. Each issue focuses on a high-interest, high-impact topic plus includes a range of papers detailing applications of ceramics. Papers on all aspects of applied ceramics are welcome including those in the following areas: Nanotechnology applications; Ceramic Armor; Ceramic and Technology for Energy Applications (e.g., Fuel Cells, Batteries, Solar, Thermoelectric, and HT Superconductors); Ceramic Matrix Composites; Functional Materials; Thermal and Environmental Barrier Coatings; Bioceramic Applications; Green Manufacturing; Ceramic Processing; Glass Technology; Fiber optics; Ceramics in Environmental Applications; Ceramics in Electronic, Photonic and Magnetic Applications;
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