Accessible Requires Authentication Published by De Gruyter July 4, 2018

Effect of h-BN@Al2O3 on the microstructure and mechanical properties of Si3N4/TiC ceramic composite

Wenliang Zhang, Zhaoqiang Chen, Guangchun Xiao, Mingdong Yi, Jun Ma and Chonghai Xu

Abstract

In this study, a new type of (Si3N4/TiC/(h-BN@Al2O3)) ceramic material containing different amounts of coated h-BN were prepared by vacuum hot-pressing sintering. Microstructural analysis showed that the h-BN@Al2O3 particles were dispersed homogeneously and that the particles were tightly bound in the matrix, as determined by scanning electron microscopy. The effects of h-BN@Al2O3 content on the mechanical properties of the composites were also investigated. The optimal content of h-BN@Al2O3 was 10 vol.%. The flexural strength, hardness, and fracture toughness of the material were increased by 22.2 %, 27.0 %, and 5.9 %, respectively, relative to the material to which uncoated h-BN was added.


*Correspondence address, Professor Chonghai Xu, School of Mechanical and Automotive Engineering, Qilu University of Technology(Shandong Academy of Sciences), Daxue Road, Jinan, 250353, P.R. China, Tel.: +86-531-89631131, Fax: +86-531-89631131, E-mail:

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Received: 2017-11-11
Accepted: 2018-01-25
Published Online: 2018-07-04
Published in Print: 2018-07-12

© 2018, Carl Hanser Verlag, München