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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

C-SiC-TiC-TiB2复合材料的抗氧化性研究

肖汉宁; 黄启忠+; 杨巧勤   

  1. 湖南大学材料科学与应用化学研究所; 长沙410082; +中南工业大学粉末冶金国家重点实验室; 长沙410083
  • 收稿日期:1997-08-22 修回日期:1997-09-12 出版日期:1998-08-10 网络出版日期:1998-08-10

Oxidation Resistance of C-SiC-TiC-TiB2 Composite

XIAO Han-Ning; HUANG Qi-Zhong+; YANG Qian-Qin   

  1. Material Science & Applied Chemistry Institute; Henal University Changsha 410082 China; +National La6omtory of Powder Metallurpy; Central South University of TechnologyChangsha 110083 China
  • Received:1997-08-22 Revised:1997-09-12 Published:1998-08-10 Online:1998-08-10

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摘要： 本文对原位反应合成的C-SiC-TiC-TiB2复合材料在600～1200℃空气中的抗氧化性进行了研究．在不同材料组成和试验温度下，试样分别出现氧化增重和失重，这主要取决于碳相和陶瓷相的氧化速率及氧化层的结构特征．在600℃该材料几乎不被氧化；800℃时，TiB2被优先氧化，形成B2O3液相；在1000℃以上，B2O3与SiO2生成硼硅酸盐玻璃，形成一致密氧化层．氧化过程中液相的出现和致密氧化层的形成显著降低了氧化速率，使材料进入钝氧化，从而大幅度地提高了该材料的抗氧化能力．

关键词: 碳／陶瓷复合材料, 抗氧化性

Abstract: Oxidation resistance of C-SiC-TiC-TiB2 composite prepared by in-situ synthesis was conducted from 600 to 1200℃ in air. Both weight gain and
loss occurred by the difference of composition and testing temperature. The weight change essentially depends on the rate of oxidation of carbon and ceramics and the
characteristics of oxidized surface. The composite was hardly oxidized at 600℃. TiB2 was first oxidized and B2O3 liquid formed at 800℃. B2O3 and
SiO2 trend to form a borosilicate glass above 1000℃, which lead to a formation of dense oxide surface. The rate of oxidation was obviously decreased by the appearance
of liquid phase and the formation of dense oxide surface during oxidation. This makes the oxidation mechanism of the composite into blunting oxidation, resulting in
the increase of oxidation resistance.

Key words: carbon/ceramic composite, oxidation resistance

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