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

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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 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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Acknowledgements

This study was financially supported by the National Key Research and Development Program of China (No. 2017YFB0703200) and the National Natural Science Foundation of China (Nos. 51672060, 51621091 and 51372050).

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Authors and Affiliations

  1. Key Laboratory of Advanced Structural-Functional Integration Materials & Green Manufacturing Technology, Harbin Institute of Technology, Harbin, 150001, China

    Bao-Fu Qiu, Xiao-Ming Duan, Zhuo Zhang, Xing-Qi Liao, Zhi-Hua Yang, De-Long Cai, De-Chang Jia & Yu Zhou

  2. Institute for Advanced Ceramics, School of Materials Science and Engineering, Harbin Institute of Technology, Harbin, 150001, China

    Bao-Fu Qiu, Xiao-Ming Duan, Zhuo Zhang, Xing-Qi Liao, Zhi-Hua Yang, De-Long Cai, De-Chang Jia & Yu Zhou

  3. State Key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology, Harbin, 150001, China

    Xiao-Ming Duan, Zhi-Hua Yang & De-Chang Jia

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  1. Bao-Fu Qiu
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Correspondence to Xiao-Ming Duan or De-Chang Jia.

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Qiu, BF., Duan, XM., Zhang, Z. et al. Microstructural evolution and mechanical properties of h-BN composite ceramics with Y2O3–AlN addition by liquid-phase sintering. Rare Met. 39, 555–561 (2020). https://doi.org/10.1007/s12598-019-01338-8

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  • DOI: https://doi.org/10.1007/s12598-019-01338-8

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