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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

无压烧结制备Si3N4/SiO2复合材料

徐常明1,2, 王士维1, 黄校先1, 郭景坤1   

  1. 1. 中国科学院上海硅酸盐研究所, 上海 200050;
    2. 中国科学院研究生院, 北京 100049
  • 收稿日期:2005-07-20 修回日期:2005-11-30 出版日期:2006-07-20 网络出版日期:2006-07-20

Preparation of Si3N4/SiO2 Composites with Pressureless Sintering

XU Chang-Ming1,2, WANG Shi-Wei1, HUANG Xiao-Xian1, GUO Jing-Kun1   

  1. 1. Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai
    200050, China;
    2. Graduate School of Chinese Academy of Sciences, Beijing 100049, China
  • Received:2005-07-20 Revised:2005-11-30 Published:2006-07-20 Online:2006-07-20

PDF (PC)

1846

摘要：

以无压烧结工艺制备了Si3N4/SiO2复合材料. 实验结果表明: Si3N4颗粒对石英基体的析晶起到了抑制作用和增韧补强作用. Si3N4含量为5vol%的样品在1370℃烧结2h后, 抗弯强度达到96.2MPa, 断裂韧性为2.4MPa·m1/2, 介电常数和介电损耗分别在3.63～3.68和1.29～1.75×10-3之间.

关键词: 天线罩, 无压烧结, Si3N4/SiO2复合材料, 力学性能, 介电性能

Abstract: Si3N4/SiO2 composites were prepared with pressureless sintering. It was found that the Si3N4 particle was effective to suppress the crystallization of cristobalite in the Si3N4/SiO2 composites and contributed to the improvement of the mechanical properties. After sintered at 1370℃ for 2h, the flexural strength of the composites with 5vol% Si3N4 addition reached 96.2MPa, the fracture toughness was 2.4MPa·m1/2. The dielectric constant and loss tangent of the composites was 3.63～3.68 and 1.29～1.75×10-3, respectively.

Key words: radome, pressureless sintering, Si3N4/SiO2 composites, mechanical properties, dielectric properties

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