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Silicon Nitride/Boron Nitride Composite by Combustion Synthesis

Authors :
Wei Ping Shen
Chang Chun Ge
Qiang Zhang
Peng Fei Wang
Ling Bai
Ke Zhang
Source :
Materials Science Forum. :531-534
Publication Year :
2007
Publisher :
Trans Tech Publications, Ltd., 2007.

Abstract

Machinable silicon nitride/ hexahedral boron nitride (Si3N4/h-BN) composites were in-situ synthesized in a nitrogen (N2) atmosphere by means of combustion synthesis gas-solid reaction with silicon (Si) powder and h-BN as raw materials. The effect of the volume fraction of h-BN on the machinable properties of Si3N4/BN composite was studied. The results show that Si powder was fully nitrified and no residual Si was found. Microstructures by a scanning electron microscopy (SEM) show Columnar crystals of β-Si3N4 are the main phase and acicular crystals of h-BN disperse β-Si3N4 intergranular. With the increasing of the volume content of h-BN, the machinability of the composite increases, but the bending strength of composite decreases firstly and then increases. The lowest bending strength is 84.96MPa at 25% volume fraction of h-BN.

Details

ISSN :
16629752
Database :
OpenAIRE
Journal :
Materials Science Forum
Accession number :
edsair.doi...........56604eab0947272ac311a7714c3d7755