Oxidation Behaviors of the Pressureless Sintered ZrB2-SiC Composites

doi:10.3724/SP.J.1077.2009.00631

Abstract

Abstract:

The pressureless sintering process of ZrB₂-SiC composite ceramics was studied. The ceramic samples was prepared by using sol-gel synthesized ultra-fine ZrB₂ powders as sources and different contents of Mo and/or B₄C as sintering aids. The static oxidation behaviors of the sintered ZrB₂-20wt%SiC composite ceramics using 4wt%Mo and 4wt%Mo-2wt%B₄C additives were systemically analyzed. The results show that the composite ceramics oxidized quickly with visible ZrO₂ particles on the surface above 1300℃/30min with pure Mo additive. While Mo-B₄C additive is added, the protective liquid layer appears at 1300℃ and becomes thicker and uniform with the temperature rising. The composite ceramics present good oxidation resistance of which the flexural strength retains 86% of the value in room temperature after oxidiation at 1500℃ for 30min.

Key words: ultra-high temperature ceramics, pressureless sintering, oxidation resistance

CLC Number:

TB335

YAN Yong-Jie,ZHANG Hui,HUANG Zheng-Ren,LIU Xue-Jian. Oxidation Behaviors of the Pressureless Sintered ZrB₂-SiC Composites[J]. Journal of Inorganic Materials, DOI: 10.3724/SP.J.1077.2009.00631.

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Oxidation Behaviors of the Pressureless Sintered ZrB₂-SiC Composites

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