Microstructural evolution and mechanical properties of h-BN composite ceramics with Y2O3-AlN addition by liquid-phase sintering
来源期刊：Rare Metals2020年第5期
论文作者：Bao-Fu Qiu Xiao-Ming Duan Zhuo Zhang Xing-Qi Liao Zhi-Hua Yang De-Long Cai De-Chang Jia Yu Zhou
文章页码：555 - 561
摘 要：Hexagonal boron nitride（h-BN）composite ceramics were prepared by hot pressing with the addition of Y2O3 and AlN.The effects of different Y2O3–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.
Bao-Fu Qiu1,2，Xiao-Ming Duan1,2,3，Zhuo Zhang1,2，Xing-Qi Liao1,2，Zhi-Hua Yang1,2,3，De-Long Cai1,2，De-Chang Jia1,2,3，Yu Zhou1,2
1. Key Laboratory of Advanced Structural-Functional Integration Materials & Green Manufacturing Technology,Harbin Institute of Technology2. Institute for Advanced Ceramics,School of Materials Science and Engineering,Harbin Institute of Technology3. State Key Laboratory of Advanced Welding and Joining,Harbin Institute of Technology
摘 要：Hexagonal boron nitride（h-BN）composite ceramics were prepared by hot pressing with the addition of Y2O3 and AlN.The effects of different Y2O3–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.
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