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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

高温自蔓延燃烧合成的β-Si3N4粉体的烧结

蒋久信1; 王佩玲1; 程一兵2; 陈卫武1; 庄汉锐1; 严东生1   

  1. 1. 中国科学院上海硅酸盐研究所高性能陶瓷和超微结构国家重点实验室, 上海 200050; 2. 澳大利亚Monash大学物理与材料工程学院
  • 收稿日期:2003-10-14 修回日期:2003-11-28 出版日期:2004-11-20 网络出版日期:2004-11-20

Sintering of β-Si3N4 Powder Derived by SHS

JIANG Jiu-Xin1; WANG Pei-Ling1; CHENG Yi-Bing2; CHEN Wei-Wu1; ZHUANG Han-Rui1; YAN Dong-Sheng1   

  1. 1.State Key Lab of High Performance Ceramics and Superfine Microstructure; Shanghai Institute of Ceramics; Chinese Academy of Science; Shanghai 200050; China; 2.School of Physics and Materials Engineering; Monash University; Clayton; Victoria; 3800; Australia
  • Received:2003-10-14 Revised:2003-11-28 Published:2004-11-20 Online:2004-11-20

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摘要： 研究了MgO,Al2O3和Y2O3作为烧结助剂对高温自蔓延工艺合成(SHS)的β-Si3N4粉料烧结过程的影响.结果发现,MgO是较为有效的烧结助剂,当其加入量为10wt％时,试样在1600℃下热压烧结能基本实现致密化.对试样的XRD分析表明,除了加入的Al2O3与β—Si3N4反应生成β-Sialon外,其他烧结助剂都不与β-Si3N4反应,只存在于玻璃相中.添加MgO的试样具有较高的力学性能.最后,对材料的显微形貌进行了SEM观察.

关键词: 高温自蔓延合成（SHS）, β-Si3N4, 烧结过程, 烧结助剂, 力学性能

Abstract: The sintering of β-Si3N4 powder synthesized by self-propagating high-temperature synthesis was studied with the addition of MgO, Al2O3, Y2O3 as sintering additives. MgO was found to
be the effective sintering aids, and β-Si3N4 could be densified at 1600℃ under 20MPa with the addition of 10wt% MgO. XRD results showed that the additives did not react with β-Si3N4,
existing in glassy phase of the sintered sample, with the exception of Al2O3, which reacted with β-Si3N4 to form β -Sialon phase. The samples with MgO added had better mechanical properties
than that of samples doped with Y2O3 and Al2O3.

Key words: SHS, β-Si3N4, sintering process, sintering aids, mechanical properties

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