OXIDATION OF SILICON CARBIDE-REINFORCED OXIDE-MATRIX COMPOSITES AT 1375-DEGREES-C TO 1575-DEGREES-C

被引：87

作者：

LUTHRA, KL

PARK, HD

机构：

[1] General Electric Corporate Research and Development, Schenectady, New York

来源：

JOURNAL OF THE AMERICAN CERAMIC SOCIETY | 1990年 / 73卷 / 04期

关键词：

alumina; composites; mullite; oxidation; silicon carbide;

D O I：

10.1111/j.1151-2916.1990.tb05150.x

中图分类号：

TQ174 [陶瓷工业]; TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

Oxidation studies were conducted on Al2O3‐SiC and mullite‐SiC composites at 1375° to 1575°C in O2 and in Ar‐1% O2. The composites were prepared by hot‐pressing mixtures of Al2O3 or mullite and SiC powders. The reaction products contained alumina, mullite, an aluminosilicate liquid, and gas bubbles. The parabolic rate constants were about 3 orders of magnitude higher than those expected for the oxidation of SiC. Higher rates are caused by higher oxygen permeabilities through the reaction products than through pure silica. Our results suggest that oxygen permeabilities are comparable in the three condensed phases observed in the reaction products. Copyright © 1990, Wiley Blackwell. All rights reserved

引用

页码：1014 / 1023

页数：10

共 20 条

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