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Anisotropic properties of textured h-BN matrix ceramics prepared using 3Y2O3-5Al2O3(-4MgO) as sintering additives
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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