Title

Oxidation of polymer-derived SiAlCN ceramics

Authors

Authors

Y. G. Wang; L. N. An; Y. Fan; L. G. Zhang; S. Burton;Z. H. Gan

Comments

Authors: contact us about adding a copy of your work at STARS@ucf.edu

Abbreviated Journal Title

J. Am. Ceram. Soc.

Keywords

AMORPHOUS-SILICON CARBONITRIDE; CATALYST-ASSISTED PYROLYSIS; C-N; CERAMICS; HIGH-TEMPERATURE; THERMAL-OXIDATION; VITREOUS SILICA; PRECURSOR; KINETICS; BEHAVIOR; CORROSION; Materials Science, Ceramics

Abstract

The oxidation behavior of polymer-derived amorphous SiAlCNs was studied in the temperature range of 900 degrees-1200 degrees C. The results revealed that while at 900 degrees C the oxidation of the SiAlCNs follows typical parabolic kinetics, at higher temperatures the oxidation rates of the materials decrease with annealing time. Long-term oxidation rate of the SiAlCNs is much lower than the lowest values reported for chemical vapor deposition of SiC and Si(3)N(4). Structures of the oxide scales were studied using solid-state nuclear magnetic resonance. We proposed that oxide scales formed for the SiAlCNs possess a unique network structure of the oxide scale in which aluminum atoms block the path of oxygen diffusion, thus lowering the oxidation rates. Such a unique structure was likely formed gradually with annealing time, leading to a continuous decrease in oxidation rate.

Journal Title

Journal of the American Ceramic Society

Volume

88

Issue/Number

11

Publication Date

1-1-2005

Document Type

Article

Language

English

First Page

3075

Last Page

3080

WOS Identifier

WOS:000232773100015

ISSN

0002-7820

Share

COinS