Microstructure and Mechanical Performance of Silicon Nitride Ceramics with Seeds Addition

doi:10.3724/SP.J.1077.2012.11555

Journal of Inorganic Materials ›› 2012, Vol. 27 ›› Issue (8): 807-812.DOI: 10.3724/SP.J.1077.2012.11555

• Research Paper • Previous Articles Next Articles

Microstructure and Mechanical Performance of Silicon Nitride Ceramics with Seeds Addition

ZHANG Ying-Wei^1,2, YU Jian-Bo¹, XIA Yong-Feng², ZUO Kai-Hui², YAO Dong-Xu², ZENG Yu-Ping², REN Zhong-Ming¹

(1. Key Lab of Modern Metallurgy and Processing of Materials, Department of Material Science and Engineering, Shanghai University, Shanghai 200072, China; 2. State Key Laboratory of High Performance Ceramics and Superfine Microstructures, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China)

Received:2011-09-01 Revised:2011-10-30 Published:2012-08-20 Online:2012-07-09
About author:ZHANG Ying-Wei. E-mail: yingweizhang2011@hotmail.com
Supported by:
National Natural Science Foundation of China (50902140, 50872142); Foundation of Shanghai Science and Technology Committee (08DZ1130100); Open Research Program of Shanghai Key Laboratory of Modern Metallurgy and Materials Processing (SELF-2010-03)

Abstract

Abstract: With Y₂O₃:Al₂O₃ of different weight ratios as sintering additives and 3wt% β-Si₃N₄ seeds addition, silicon nitride ceramics were prepared by gas pressure sintering. The phase composition, density, microstructure, room temperature as well as elevated temperature mechanical properties were investigated. The experimental results indicated that the α→β phase transformation of silicon nitride would be finished at 1800℃ for 2 h, and the densities of all specimens were over 97% of theoretical density. Compared with the specimen without seeds addition, the room temperature bending strength, the elevated temperature flexural strength at 1200℃ and the fracture toughness of the specimen with 6wt%Y₂O₃-4.5wt%Al₂O₃ and 3wt% β-Si₃N₄ seeds addition can be improved by 20%, 16% and 8%, respectively.

Key words: β-Si₃N₄seeds, mechanical property, grain morphology, viscosity of liquid phase

CLC Number:

TQ174

ZHANG Ying-Wei, YU Jian-Bo, XIA Yong-Feng, ZUO Kai-Hui, YAO Dong-Xu, ZENG Yu-Ping, REN Zhong-Ming. Microstructure and Mechanical Performance of Silicon Nitride Ceramics with Seeds Addition[J]. Journal of Inorganic Materials, 2012, 27(8): 807-812.

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Microstructure and Mechanical Performance of Silicon Nitride Ceramics with Seeds Addition

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