In situ synthesis, mechanical properties, and reaction mechanism of the WB2–SiC composites

IF 2.3 4区材料科学 Q2 MATERIALS SCIENCE, CERAMICS International Journal of Applied Ceramic Technology Pub Date : 2024-10-22 DOI:10.1111/ijac.14965

Guihao Zhang, Ying Long, Shixuan Wang, Hua-Tay Lin, Hongfei Hu

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Abstract

In the present work, WB₂–SiC composite powders containing 20 vol.% of SiC were in situ synthesized by the boro/carbothermal reduction with WO₃, SiO₂, B₄C, and carbon black as raw materials at 1400°C, 1500°C, and 1600°C, respectively. The as-synthesized composite powders were then consolidated by spark plasma sintering (SPS) technique to obtain WB₂–SiC composite bulk samples. The experimental results showed that the relative density of the WB₂–SiC composite ceramic samples achieved in this study was higher than 97.5%. Also, electronic microscopy observations showed that SiO₂ had reacted completely during the preparation process, and the SiC grains were homogenously embedded among the WB₂ grains with the formation of a three-dimensional structure. The Vickers hardness and fracture toughness values of the composite ceramic fabricated by powder heat treated at 1400°C were 24.6 ± 0.7 GPa and 5.4 ± 0.7 MPa·m^1/2, respectively, which were the highest among three samples prepared in this study.

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WB2-SiC复合材料的原位合成、力学性能及反应机理

本文以WO3、SiO2、B4C和炭黑为原料，分别在1400℃、1500℃和1600℃下，采用boro/碳热还原法原位合成了SiC含量为20 vol.%的WB2-SiC复合粉体。然后用火花等离子烧结（SPS）技术对合成的复合粉末进行固结，得到WB2-SiC复合材料体样。实验结果表明，本研究制备的WB2-SiC复合陶瓷样品的相对密度大于97.5%。电镜观察表明，SiO2在制备过程中反应完全，SiC晶粒均匀嵌埋在WB2晶粒之间，形成三维结构。经1400℃粉末热处理制备的复合陶瓷的维氏硬度和断裂韧性值分别为24.6±0.7 GPa和5.4±0.7 MPa·m1/2，是本研究制备的三种样品中最高的。

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来源期刊

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;