宇航材料工艺2023，Vol.53Issue(6)：59-63,5.DOI:10.12044/j.issn.1007-2330.2023.06.009
(Hf0.25Zr0.25W0.25Ti0.25)B2高熵陶瓷的组织结构与力学性能
Microstructure and Mechanical Properties of(Hf0.25Zr0.25W0.25Ti0.25)B2 High Entropy Ceramics
摘要
Abstract
High entropy boride ceramics have broad application prospects in aerospace,automotive engine and nuclear reactor fields.In order to improve the performance of high entropy boride ceramics and expand the family of high entropy boride ceramics,(Hf0.25Zr0.25W0.25Ti0.25)B2 high entropy boride ceramic was prepared by boron/carbothermal reduction combined with SPS(Spark Plasma Sintering)in this paper.The phase composition,microstructure and mechanical properties of the powder and ceramic were studied.The results show that after heat treatment at 1600℃,not only the high entropy phase but also W2B5 phase can be detected in(Hf0.25Zr0.25W0.25Ti0.25)B2 high entropy boride powder(particle size(0.29+0.03)μm).After sintering at 2000℃,the second phase W2B5 decreases,and the diffraction peaks of the high entropy phase shift to a higher angle.The density of ceramic reaches 95.7％.After the introduction of WB2,the high entropy boride ceramics exhibit excellent mechanical properties.The hardness is(21.3+1.5)GPa and fracture toughness is(3.00+0.22)MPa·m1/2.关键词
硼热/碳热还原法/高熵硼化物/组织结构/力学性能Key words
Boro/carbothermal reduction method/High entropy borides/Microstructure/Mechanical properties分类
矿业与冶金引用本文复制引用
张泽熙,张岩,郭伟明,许亮,张威..(Hf0.25Zr0.25W0.25Ti0.25)B2高熵陶瓷的组织结构与力学性能[J].宇航材料工艺,2023,53(6):59-63,5.基金项目
国家自然科学基金(52072077,51832002) （52072077,51832002）
广东省珠江人才计划地方创新团队项目(2017BT01C169). （2017BT01C169）
