无压烧结制备Si3N4/SiO2复合材料

无机材料学报, 2006, 21(4): 935-938. doi: 10.3724/SP.J.1077.2006.00935

无压烧结制备Si₃N₄/SiO₂复合材料

徐常明 , 王士维 , 黄校先 , 郭景坤

1.1. 中国科学院上海硅酸盐研究所, 上海 200050

2. 2. 中国科学院研究生院, 北京 100049

1.1. Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China

2. 2. Graduate School of Chinese Academy of Sciences, Beijing 100049, China

关键词：天线罩 , pressureless sintering , Si3N4/SiO2 composites , mechanical properties , dielectric properties

Preparation of Si₃N₄/SiO₂ Composites with Pressureless Sintering

XU Chang-Ming , WANG Shi-Wei , HUANG Xiao-Xian , GUO Jing-Kun

Keywords： radome , 无压烧结 , Si3N4/SiO2复合材料 , 力学性能 , 介电性能

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·m^1/2, 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.

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·m^1/2. The dielectric constant and loss tangent of the composites was 3.63～3.68 and 1.29～1.75×10^-3, respectively.

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