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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

低纯度外β-Si3N4粉末的无压烧结及其性能

徐鑫; 黄莉萍; 陈源; 符锡仁   

  1. 中国科学院上海硅酸盐研究所; 上海 200050
  • 收稿日期:1998-07-08 修回日期:1998-07-23 出版日期:1999-06-20 网络出版日期:1999-06-20

Pressureless Sintering of Refractory Grade β-Si3N4 Powder and Mechanical Properties of the Sintered Materials

XU Xin; HUANG Li-Ping; CHEN Yuan; FU Xi-Ren   

  1. Shanghai Institute of Ceramics; Chinese Academy of Sciences Shanghai 200050 China
  • Received:1998-07-08 Revised:1998-07-23 Published:1999-06-20 Online:1999-06-20

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摘要： 为了降低氮化硅材料的成本，运用便宜的低纯度从β-Si3N4粉末，通过无压烧结制备了氮化硅材料．发现β-Si3N4粉末具有很好的烧结性能，得到的结构是由柱状颗粒和小球状颗粒形成的嵌套结构，结构组成均匀，没有晶粒的异常生长．所得材料的抗弯强度为587MPa，韧性达到5.3MPa.m1/2，说明可在一般条件下使用。

关键词: 氮化硅, 低纯度, 无压烧结, 显微结构, 力学性能

Abstract: Refractory grade β-St3N4 powder was pressureless sintered with the aim of lowering cost. It is showed that β-St3N4 has good sinterability. A microstructure with small rod-like grains was obtained, which dispersed uniformly in the matrix, no abnormal rod-like grains was observed. The material displayed a strength of 587MPa and fracture toughness of 5.3MPa.m1/2, which allow the material used in normal circumstance.

Key words: silicon nitride, refractory grade, pressureless sinter, microstructure, mechanical property

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