Research on Sintering Stability of Cubic Silicon Nitride Synthesized by Shock-wave

doi:10.3724/SP.J.1077.2008.00819

Journal of Inorganic Materials

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Research on Sintering Stability of Cubic Silicon Nitride Synthesized by Shock-wave

YAO Huai¹, XU Qiao-Yu², QI Xin³, TANG Jing-You⁴, LIU Hai-Yang¹, CHANG Qing-Hua¹

(1. School of Materials Science and Engineering, Henan University of Science and Technology, Luoyang 471003, China; 2. School of Electromechnical Engineering, Henan University of Science and Technology, Luoyang 471003, China; 3. School of Computer Science and Technology, Harbin University of Science and Technology, Harbin 150080, China; 4. School of Materials Science and Engineering, Southwest University of Science and Technology, Mianyang 621010, China)

Received:2007-09-05 Revised:2007-11-28 Published:2008-07-20 Online:2008-07-20

Abstract

Abstract: Silicon nitride ceramics was prepared by super-high pressure using the γ-Si₃N₄ powders synthesized by the shock-wave technique as raw materials and with Y₂O₃-Al₂O₃-La₂O₃mixtures as additives at 5.7GPa from 1370K to 1670K. The stability, relative density, mechanical properties and microstructure of the compacts synthesized at different temperatures were investigated. The results show that γ-Si₃N₄ is completely transformed to β-Si₃N₄ at temperature from 1420K to 1670K,
and partly transformed to β-Si₃N₄ at 1370K. Micro-analysis indicates that the typical microstructure of sintered Si₃N₄ is mainly composed of β-Si₃N₄ rod crystals with disordered orientation and uniform microstructures. The relative density
and Vickers hardness in the as-sintered (5.7GPa, 1370K) samples are 98.83% and 21.09GPa, respectively.

Key words: shock wave synthesis, high pressure and high temperature, sintering, phase transition, stability

CLC Number:

O771

YAO Huai,XU Qiao-Yu,QI Xin,TANG Jing-You,LIU Hai-Yang,CHANG Qing-Hua. Research on Sintering Stability of Cubic Silicon Nitride Synthesized by Shock-wave[J]. Journal of Inorganic Materials, DOI: 10.3724/SP.J.1077.2008.00819.

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Research on Sintering Stability of Cubic Silicon Nitride Synthesized by Shock-wave

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