Preparation of Si3N4/SiO2 Composites with Pressureless Sintering

doi:10.3724/SP.J.1077.2006.00935

Abstract

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·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.

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

CLC Number:

TB321

XU Chang-Ming,WANG Shi-Wei,HUANG Xiao-Xian,GUO Jing-Kun. Preparation of Si₃N₄/SiO₂ Composites with Pressureless Sintering[J]. Journal of Inorganic Materials, DOI: 10.3724/SP.J.1077.2006.00935.

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Preparation of Si₃N₄/SiO₂ Composites with Pressureless Sintering

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