Relationship between oxidation resistance and structure of B4C-SIC/C composites with self-healing properties

被引：46

作者：

Guo, QG ^{[1
]}

Song, JR ^{[1
]}

Liu, L ^{[1
]}

Zhang, BJ ^{[1
]}

机构：

[1] Chinese Acad Sci, Inst Coal Chem, Taiyuan Shanxi 030001, Peoples R China

来源：

CARBON | 1999年 / 37卷 / 01期

关键词：

carbon composites; oxidation; surface treatment; thermal analysis; surface properties;

D O I：

10.1016/S0008-6223(98)00184-5

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

The oxidation behavior of B4C-SiC/C composites of various compositions at temperatures up to 1500 degrees C was analyzed by the thermal gravimetric/differential thermal analysis (TG/DTA) technique and the surface morphology of the composites after isothermal oxidation at 800, 1000 and 1200 degrees C was examined by scanning electron microscopy. The results indicated that the composites exhibited variable oxidation resistance at high temperatures depending on composition and oxidation temperature. The variance of self-healing properties was attributed to the difference of the compositions and the properties of the decarbonized layers including wetting ability, viscosity, volatility and oxygen permeability. The rate-limiting steps of oxidation and the concentration distribution of oxygen across the decarbonized layers of the composites after oxidation are discussed. (C) 1998 Elsevier Science Ltd. All rights reserved.

引用

页码：33 / 40

页数：8

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