期刊
CERAMICS INTERNATIONAL
卷 46, 期 5, 页码 6906-6913出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.ceramint.2019.11.186
关键词
High-entropy ceramics; Borocarbothermal reduction; Boride; Thermal conductivity
资金
- Office of Naval Research MURI program [N00014-15-1-2863]
- National Science Foundation [CBET-1706388]
Four high-entropy metal diborides have been synthesized and densifled by borocarbothermal reduction of metal oxides with boron carbide and graphite and subsequent spark plasma sintering. Three of them, (Hf0.2Zr0.2Ti0.2Ta0.2Nb0.2)B-2, (Hf0.2Zr0.2Ti0.2Ta0.2Mo0.2)B-2, and (Hf0.2Zr0.2Ti0.2Ta0.2Cr0.2)B-2, possess single high-entropy phases and have been sintered to > 99% of the theoretical densities. The fourth (Hf0.2Zr0.2Ti0.2Mo0.2W0.2)B-2 specimen contained a Ti-Mo-W rich secondary phase in addition to the primary metal diboride phase. The specimens made by borocarbothermal reduction exhibit improved hardnesses in comparison with those samples previously fabricated via high energy ball milling and spark plasma sintering. Interestingly, the single-phase (Hf0.2Zr0.2Ti0.2Ta0.2Mo0.2)B-2 and (Hf0.2Zr0.2Ti0.2Ta0.2Cr0.2)B-2 (both of which have Vickers hardness values of -25 GPa) are substantially harder than (Hf0.2Zr0.2Ti0.2Ta0.2Nb0.2)B-2 (20.5 GPa), despite MoB2 and CrB2 being typically considered as softer components. These single-phase high-entropy metal diborides were found to have low thermal conductivities of 12-25 W/mK, which are similar to 1/10 to similar to 1/5 of the reported values of HfB2 and ZrB2.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据