(Hf0.25Zr0.25W0.25Ti0.25)B2高熵陶瓷的组织结构与力学性能
作者:
作者单位:

广东工业大学,广州 510006

作者简介:

通讯作者:

中图分类号:

TG148

基金项目:

国家自然科学基金(52072077,51832002);广东省珠江人才计划地方创新团队项目(2017BT01C169)。


Microstructure and Mechanical Properties of (Hf0.25Zr0.25W0.25Ti0.25)B2 High Entropy Ceramics
Author:
Affiliation:

Guangdong University of Technology, Guangzhou 510006

Fund Project:

This work was supported by the National Natural Science Foundation of China (52072077, 51832002); Guangdong Provincial Innovative Team Project of Pearl River Talent Program (No.2017BT01C169)

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    摘要:

    为了提高高熵硼化物陶瓷的性能,扩大高熵硼化物陶瓷家族,本文通过硼热/碳热还原法结合SPS制备(Hf0.25Zr0.25W0.25Ti0.25)B2高熵硼化物粉末与陶瓷,并对其物相组成、组织形貌和力学性能进行研究。结果表明,经1 600 ℃热处理后(Hf0.25Zr0.25W0.25Ti0.25)B2高熵硼化物粉末除了检测出高熵相,还检测到W2B5第二相,粉末粒径为(0.29±0.03) μm;2 000 ℃烧结后W2B5减少,高熵相的衍射峰向高角度偏移,致密度达95.7%,引入WB2后其具有优异的力学性能,硬度(21.3±1.5) GPa,断裂韧性(3.00±0.22) MPa·m1/2

    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·ml/2.

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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.

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  • 收稿日期:2021-07-03
  • 最后修改日期:2021-07-20
  • 录用日期:2021-07-26
  • 在线发布日期: 2023-12-15
  • 出版日期: 2023-12-30
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