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

Hexagonal boron nitride (h-BN) composite ceramics were prepared by hot pressing with the addition of Y 2 O 3 and AlN. The effects of different Y 2 O 3 –AlN contents on microstructural evolution, mechanical properties and thermal diffusion coefficients of h-BN composite ceramics were investigated. Th...

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Bibliographic Details
Published in:Rare metals 2020-05, Vol.39 (5), p.555-561
Main Authors: Qiu, Bao-Fu, Duan, Xiao-Ming, Zhang, Zhuo, Liao, Xing-Qi, Yang, Zhi-Hua, Cai, De-Long, Jia, De-Chang, Zhou, Yu
Format: Article
Language:English
Subjects:
Biomaterials
Boron nitride
Ceramics
Chemistry and Materials Science
Energy
Evolution
Grains
Hot pressing
Inflection points
Liquid phase sintering
Liquid phases
Materials Engineering
Materials Science
Mechanical properties
Metallic Materials
Microstructure
Nanoscale Science and Technology
Physical Chemistry
Porosity
Solid phases
Thermal diffusion
Wettability
Yttrium oxide
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Summary:Hexagonal boron nitride (h-BN) composite ceramics were prepared by hot pressing with the addition of Y 2 O 3 and AlN. The effects of different Y 2 O 3 –AlN contents on microstructural evolution, mechanical properties and thermal diffusion coefficients of h-BN composite ceramics were investigated. The results indicate that Y 2 O 3 –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% Y 2 O 3 –AlN, the h-BN grains grow well when controlled through solid-phase and liquid-phase diffusion, respectively. With the increase in Y 2 O 3 –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% Y 2 O 3 –AlN are the inflection points. Such properties are highly related to the phase compositions, porosity and microstructure. Graphic abstract
ISSN:1001-0521
1867-7185
DOI:10.1007/s12598-019-01338-8