SURFACE OXIDATION AND ITS EFFECT ON THE OBSERVED ELASTIC-MODULUS OF SIC WHISKER AL2O3 COMPOSITES/

Authors
CHIU CC CASE ED CHIU CCS
Citation
Cc. Chiu et al., SURFACE OXIDATION AND ITS EFFECT ON THE OBSERVED ELASTIC-MODULUS OF SIC WHISKER AL2O3 COMPOSITES/, Journal of composite materials, 28(1), 1994, pp. 2-21
Citations number
29
Categorie Soggetti
Materials Sciences, Composites
Journal title
Journal of composite materials → ACNP
ISSN journal
00219983
Volume
28
Issue
1
Year of publication
1994
Pages
2 - 21
Database
ISI
SICI code
0021-9983(1994)28:1<2:SOAIEO>2.0.ZU;2-E
Abstract
This article presents an analysis of the 27 wt. % SiC whisker/Al2O3 co mposites exposed to air for periods up to 180 hours at 1100 degrees C to 1450 degrees C. Experimental results indicate that SiC whisker reac ts with oxygen and alumina to produce a mullite-rich surface layer on tested composite specimens. The surface oxidation reaction degrades th e observed elastic moduli of specimens. A theoretical analysis based o n the Bernoulli-Euler beam equation shows that the surface layer has l ower elastic modulus than the unreacted core.