OXIDATION-INHIBITION MECHANISMS IN COATED CARBON CARBON COMPOSITES

被引：32

作者：

NIXON, TD ^{[1
]}

CAWLEY, JD ^{[1
]}

机构：

[1] OHIO STATE UNIV,DEPT MAT SCI & ENGN,COLUMBUS,OH 43210

来源：

JOURNAL OF THE AMERICAN CERAMIC SOCIETY | 1992年 / 75卷 / 03期

关键词：

D O I：

10.1111/j.1151-2916.1992.tb07862.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：

The mechanism of oxidation resistance in SiC-coated carbon-carbon composites containing boron-based inhibitors has been investigated using thermodynamic calculations, thermogravimetric analysis, and electron microscopy. A model is developed based on the formation of a volatile B2O2 sub-oxide in the interior of the composite which condenses to B2O3 upon encountering a locally high oxygen partial pressure in coating cracks. The active-to-passive transition for the oxidation of elemental boron has been determined.

引用

页码：703 / 708

页数：6

共 22 条

[1]

ESTELL TH, 1972, METALL TRANS, V3, P27

[2] HIGH-TEMPERATURE OXIDATION, REDUCTION, AND VOLATILIZATION REACTIONS OF SILICON AND SILICON-CARBIDE [J].