Research on the microstructure and mechanical properties of high-entropy composite ceramics

IF 2.3 4区材料科学 Q2 MATERIALS SCIENCE, CERAMICS

International Journal of Applied Ceramic Technology Pub Date : 2025-06-01 DOI:10.1111/ijac.15191

Hui-Ze Li, Yan Zhang, Bo-Yu Ni, Zhang-Yu Wu, Hao-Yu Cao, Fa-Cai Yan, Rui-Wen Tang, Ye Liu

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Abstract

To investigate the microstructure and mechanical properties of HEB-SiC composite ceramics, various SiC contents (10 vol%, 20 vol%, 30 vol%) were incorporated as the second phase. (Mo_0.2Nb_0.2Zr_0.2Hf_0.2Ti_0.2)B₂-(10 vol%, 20 vol%, 30 vol%)SiC composite ceramics were synthesized using borothermal/carbothermal reduction followed by SPS. As the sintering temperature increased, the hardness of the composite ceramics remained relatively stable, while the fracture toughness showed a notable improvement. Additionally, with an increase in SiC content, the hardness of the composite ceramics decreased, whereas the fracture toughness increased. The highest hardness values were observed for the 10 vol% SiC samples, measuring 31.4 ± 1.4 GPa at 1800°C and 31.4 ± 1.3 GPa at 1900°C. The 30 vol% SiC sample sintered at 1900°C exhibited the highest fracture toughness, reaching 5.24 ± 0.44 MPa·m^1/2. These findings demonstrate that increasing the SiC content enhances the mechanical properties of high-entropy boride ceramics.

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高熵复合陶瓷的微观结构与力学性能研究

为了研究HEB-SiC复合陶瓷的微观组织和力学性能，将不同SiC含量（10 vol%, 20 vol%, 30 vol%）作为第二相。采用硼热/碳热还原- SPS法制备了（Mo0.2Nb0.2Zr0.2Hf0.2Ti0.2）B2-(10 vol%, 20 vol%, 30 vol%)SiC复合陶瓷。随着烧结温度的升高，复合陶瓷的硬度保持相对稳定，而断裂韧性有明显提高。随着SiC含量的增加，复合陶瓷的硬度降低，断裂韧性提高。SiC含量为10%的样品在1800℃和1900℃时的硬度分别为31.4±1.4 GPa和31.4±1.3 GPa。在1900℃下烧结的30 vol% SiC试样的断裂韧性最高，达到5.24±0.44 MPa·m1/2。结果表明，SiC含量的增加提高了高熵硼化物陶瓷的力学性能。

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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;