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Research Article | Open Access

Texture and anisotropy of hot-pressed h-BN matrix composite ceramics with in situ formed YAG

Zhuo ZHANGa,bXiaoming DUANa,b,c( )Zhuo TIANdYujin WANGa,b( )Lan WANGa,bLei CHENa,bBaofu QIUa,bDelong CAIa,bPeigang HEa,bDechang JIAa,b,c( )Yu ZHOUa,b
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
School of Electromechanical Engineering, Guangdong University of Technology, Guangzhou 510006, China
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Graphical Abstract

Abstract

Textured hexagonal boron nitride (h-BN) matrix composite ceramics were prepared by hot- pressing using different contents of 3Y2O3-5Al2O3 (molar ratio of 3:5) as the sintering additive. During hot-pressing, the liquid Y3Al5O12 (YAG) phase showing good wettability to h-BN grains was in situ formed through the reaction between Y2O3 and Al2O3, and a coherent relationship between h-BN and YAG was observed with [010]h-BN// [1¯11]YAG and (002)h-BN//(321)YAG. In the YAG liquid phase environment formed during hot-pressing, plate-like h-BN grains were rotated under the uniaxial sintering pressure and preferentially oriented with their basal surfaces perpendicular to the sintering pressure direction, forming textured microstructures with the c-axis of h-BN grains oriented parallel to the sintering pressure direction, which give these composite ceramics anisotropy in their mechanical and thermal properties. The highest texture degree was found in the specimen with 30 wt% YAG, which also possesses the highest anisotropy degree in thermal conductivity. The aggregation of YAG phase was observed in the specimen with 40 wt% YAG, which resulted in the buckling of h-BN plates and significantly reduced the texture degree.

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Journal of Advanced Ceramics
Pages 532-544
Cite this article:
ZHANG Z, DUAN X, TIAN Z, et al. Texture and anisotropy of hot-pressed h-BN matrix composite ceramics with in situ formed YAG. Journal of Advanced Ceramics, 2022, 11(4): 532-544. https://doi.org/10.1007/s40145-021-0553-3

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Received: 22 August 2021
Revised: 17 October 2021
Accepted: 09 November 2021
Published: 17 March 2022
© The Author(s) 2021.

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