Microstructural evolution and mechanical properties of h-BN composite ceramics with Y2O3-AlN addition by liquid-phase sintering

Bao-Fu Qiu ¹Xiao-Ming Duan ²Zhuo Zhang ¹Xing-Qi Liao ¹Zhi-Hua Yang ²De-Long Cai ¹De-Chang Jia ²Yu Zhou¹

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作者信息

1. Key Laboratory of Advanced Structural-Functional Integration Materials & Green Manufacturing Technology, Harbin Institute of Technology, Harbin 150001, China;Institute for Advanced Ceramics, School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China
2. Key Laboratory of Advanced Structural-Functional Integration Materials & Green Manufacturing Technology, Harbin Institute of Technology, Harbin 150001, China;Institute for Advanced Ceramics, School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China;State Key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology, Harbin 150001, China
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Abstract

Hexagonal boron nitride (h-BN) composite ceramics were prepared by hot pressing with the addition of Y2O3 and AlN.The effects of different YaO3-AlN contents on microstructural evolution,mechanical properties and thermal diffusion coefficients of h-BN composite ceramics were investigated.The results indicate that Y2O3-AlN forms a liquid phase during the sintering process,achieving a good wettability with h-BN grains.In pure h-BN ceramic and h-BN composite ceramic with 40 wt％ Y2O3-AlN,the h-BN grains grow well when controlled through solid-phase and liquid-phase diffusion,respectively.With the increase in Y2O3-AlN content,mechanical properties and thermal diffusion coefficients of h-BN composite ceramics first decrease and then increase,and the properties of h-BN composite ceramic with 10 wt％ Y2O3-AlN are the inflection points.Such properties are highly related to the phase compositions,porosity and microstructure.

Key words

Hexagonal boron nitride/Y2O3-AlN/Liquid-phase sintering/Wettability/Mechanical properties

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基金项目

This study was financially supported by the National Key Research and Development Program of China(2017YFB0703200)

and the National Natural Science Foundation of China(Nos.51672060)

and the National Natural Science Foundation of China(51621091)

and the National Natural Science Foundation of China(51372050)

出版年

2020

稀有金属(英文版)

中国有色金属学会

稀有金属(英文版)

CSTPCDCSCDSCIEI

影响因子：0.801

ISSN：1001-0521

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