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Microstructure, chemical aspects, and mechanical properties of TiB2/Si3N4 and TiN/Si3N4 composites

Published online by Cambridge University Press:  03 March 2011

Jow-Lay Huang ,
Shih-Yih Chen  and
Ming-Tung Lee
Jow-Lay Huang
Affiliation:
Department of Materials Science and Engineering, National Cheng Kung University, Tainan, Taiwan 701, Republic of China
Shih-Yih Chen
Affiliation:
Department of Materials Science and Engineering, National Cheng Kung University, Tainan, Taiwan 701, Republic of China
Ming-Tung Lee
Affiliation:
Department of Materials Science and Engineering, National Cheng Kung University, Tainan, Taiwan 701, Republic of China
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Abstract

The chemical stability of TiB2 and TiN in a silicon nitride matrix under various conditions of temperature and gaseous environments was investigated. The addition of TiB2 and TiN on the microstructure and mechanical properties was also studied. No trace of interactions between TiN and Si3N4 was noticed. The addition of TiB2 to Si3N4 enhanced conversion of the α to β phase of the Si3N4 matrix. Observations of BN and TiN indicated a possible reaction between TiB2 and Si3N4. The fracture toughness of Si3N4 was substantially enhanced with the addition of TiB2 or TiN, while the strength was decreased. Crack deflection was the major toughening mechanism in a Si3N4/TiB2 composite. Most of the microcracks passed through TiN particles and cleavaged along preferred orientations with large deflection angles.

Type
Articles
Information
Journal of Materials Research , Volume 9 , Issue 9 , September 1994 , pp. 2349 - 2354
Copyright
Copyright © Materials Research Society 1994

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