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Mechanical Properties and Machinability of Si3N4/hBN Composites Prepared by Pressureless Sintering

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Abstract:

The effects of hBN content on microstructure, mechanical properties, and machinability of the pressureless-sintered Si3N4 ceramics were investigated. Flexural strength, Young’s modulus, and hardness decreased with increasing h-BN content. The mechanical properties are decreased mainly because of increased porosity of composite, and the much lower Young's modulus of BN compared to that of Si3N4. Pressureless-sintered Si3N4/hBN composites exhibit strong texture of BN grains oriented with the c-axis parallel to the cold-pressing direction. Cutting resistance of Si3N4 ceramic composites with more than 10 vol% hBN decreased with increasing hBN content, demonstrating a good machinability of the composites. The residual pores can be attributed to improved machinability of pessureless-sintered Si3N4-BN composite.

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Periodical:

Materials Science Forum (Volumes 510-511)

Pages:

1014-1017

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.510-511.1014

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Online since:

March 2006

Authors:

Won Seung Cho, Ki Ju Lee, Myeong Woo Cho, Jae Hyung Lee, Woon Suk Hwang

Keywords:

hBN, Machinability, Microstructure, Pressureless Sintering

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© 2006 Trans Tech Publications Ltd. All Rights Reserved

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References

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