Oxidative attack of carbon/carbon substrates through coating pinholes

被引：32

作者：

Jacobson, NS ^{[1
]}

Leonhardt, TA

Curry, DM

Rapp, RA

机构：

[1] NASA, Lewis Res Ctr, Cleveland, OH 44135 USA

[2] NASA, Lewis Res Ctr Grp, NYMA Inc, Cleveland, OH USA

[3] NASA, Lyndon B Johnson Space Ctr, Houston, TX 77058 USA

[4] Ohio State Univ, Dept Mat Sci & Engn, Columbus, OH 43210 USA

来源：

CARBON | 1999年 / 37卷 / 03期

关键词：

carbon/carbon composites; oxidation; surface treatment;

D O I：

10.1016/S0008-6223(98)00206-1

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：

A critical issue with oxidation protected carbon/carbon composites used for spacecraft thermal protection is the formation of coating pinholes. In laboratory experiments, artificial pinholes were drilled through SiC-coatings on a carbon/carbon material and the material was oxidized at 600, 1000, and 1400 degrees C at reduced pressures ol air. The attack of the carbon/carbon was quantified by both weight loss and a novel cross-sectioning technique, A two-zone diffusion control model was adapted to analyze this problem. Agreement of the model with experiment was reasonable at 1000 and 1400 degrees C; however results at lower temperatures show clear deviations from the theory suggesting that surface reaction control plays a role. (C) 1999 Elsevier Science Ltd. All rights reserved.

引用

页码：411 / 419

页数：9

共 16 条

[11] Countercurrent gaseous diffusion model of oxidation through a porous coating [J].