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Anisotropic properties of textured h-BN matrix ceramics prepared using 3Y2O3-5Al2O3(-4MgO) as sintering additives |
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| Authors: | Zhuo Zhang Xiaoming Duan Baofu Qiu Zhihua Yang Delong Cai Peigang He Dechang Jia Yu Zhou |
| Affiliation: | 1. Key Laboratory of Advanced Structural-Functional Integration Materials & Green Manufacturing Technology, Harbin Institute of Technology, Harbin, 150001, China;2. Institute for Advanced Ceramics, School of Materials Science and Engineering, Harbin Institute of Technology, Harbin, 150001, China;3. State Key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology, Harbin Institute of Technology, Harbin, 150001, China |
| Abstract: | Textured hexagonal boron nitride (h-BN) matrix composite ceramics were prepared by hot pressing using 3Y2O3-5Al2O3 (mole ratio of 3:5) and 3Y2O3-5Al2O3-4MgO (mole ratio of 3:5:4) as liquid phase sintering additives, respectively. During the sintering process with liquid phase environments, platelike h-BN grains were rotated to be perpendicular to the sintering pressure, forming the preferred orientation with the c-axis parallel to the sintering pressure. Both h-BN matrix ceramic specimens show significant texture microstructures and anisotropic mechanical and thermal properties. The h-BN matrix ceramics prepared with 3Y2O3-5Al2O3-4MgO possess higher texture degree and better mechanical properties. While the anisotropy of thermal conductivities of that prepared with 3Y2O3-5Al2O3 is more significant. The phase compositions and degree of grain orientation are the key factors that affect their anisotropic properties. |
| Keywords: | Corresponding authors at: Key Laboratory of Advanced Structural-Functional Integration Materials & Green Manufacturing Technology Harbin Institute of Technology Harbin 150001 China Hexagonal boron nitride Liquid phase sintering Texture Anisotropic properties |
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