Research Paper

Oxidation Behaviors of the Pressureless Sintered ZrB2-SiC Composites

  • YAN Yong-Jie ,
  • ZHANG Hui ,
  • HUANG Zheng-Ren ,
  • LIU Xue-Jian
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  • 1. Shanghai Institute of Ceramics, Chinese Academic of Sciences, Shanghai 200050, China; 2. Graduate University of the Chinese Academy of Sciences, Beijing 100049, China)

Received date: 2008-09-16

  Revised date: 2008-11-23

  Online published: 2009-05-20

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.

Cite this article

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, 2009 , 24(3) : 631 -635 . DOI: 10.3724/SP.J.1077.2009.00631

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