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无机材料学报

无机材料学报

• 研究论文 • 上一篇    下一篇

SHS-β-Si3N4的气氛加压烧结

罗新宇; 李文兰; 张宝林; 邬凤英; 徐素英; 庄汉锐   

  1. 中国科学院上海硅酸盐研究所; 上海200050
  • 收稿日期:1995-11-01 修回日期:1996-01-25 出版日期:1997-02-20 网络出版日期:1997-02-20

Gas Pressure Sintering of β-Si3N4 SHS

LUO Xinyu; LI Wenlan; ZHANG Baolin; WU Fengying; XU Suying; ZHUANG Hanrui   

  1. Shanghai Institute of Ceramics; Chinese Academy of Sciences Shanghai 200050 China
  • Received:1995-11-01 Revised:1996-01-25 Published:1997-02-20 Online:1997-02-20

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摘要： 本文用硅粉和氮气通过高温自蔓延方法合成β-Si3N4粉末，以此为原料，采用气氛加压烧结工艺，研究了烧结助剂YAG的添加量及烧结保温时间对其性能的影响.研究结果表明，在1940℃、1.2MPaAr，保温1h的条件下，β-Si3N4粉烧结后可达到99％的理论密度，并且具有较高的断裂韧性及硬度.

关键词: 高温自蔓延燃烧合成, 气氛加压烧结, β－Si3N4, 断裂韧性

Abstract: β-Si3N4 inaterial prepared by self-propagating high-teinperature synthesis from silcon powder and nitrogen was studied by gas pressure sintering process. The effects of different ainounts of YAG additive and holding time on the properties were investigated. The results show that this β-Si3N4 powder can be sintered to>99% of the theoretical density with high fracture toughness under the sintering conditions of 1.2MPa Ar pressure 1940℃ and ho1ding 1 hour.

Key words: self-propagating high-temperature synthesis, gas pressure sintering, β-Si3N4 nitride, fracture toughness