Improvement in oxidation resistance of carbon by formation of a protective SiO2 layer on the surface

Young-Hag Koh, Oh Sang Kwon, Seong Hyeon Hong, Hyoun Ee Kim, Seok Keun Lee

Research output: Contribution to journalArticle

19 Citations (Scopus)

Abstract

Solid carbon was coated with silicon dioxide (SiO2) to improve the oxidation resistance at elevated temperatures. SiO2 was deposited on the surface of carbon via gas phase transport. Coating was carried out by exposing the carbon next to a bed of SiC powder in a flowing H2-H2O gas at 1400°C for 1 h. The formation of SiO2 layer was strongly dependent on the water vapor pressure (PH2O) in the gas stream. When the PH2O was around 1.3x10-2 atm, a dense and uniform SiO2 layer was formed on the carbon surface. The layer was crystalline (cristobalite) and slightly cracked apparently due to the thermal expansion mismatch. The oxidation resistance of the carbon was improved markedly by the coating layer. When oxidized in air under the same conditions, the weight loss of the coated specimen was reduced by more than a factor of 5 compared to the uncoated specimen. This improvement in oxidation resistance was attributed to the retardation of oxygen transport through the coating layer.

Original languageEnglish
Pages (from-to)2407-2412
Number of pages6
JournalJournal of the European Ceramic Society
Volume21
Issue number13
DOIs
Publication statusPublished - 2001 Nov 1
Externally publishedYes

Fingerprint

Oxidation resistance
Carbon
Gases
Silicon Dioxide
Coatings
Steam
Vapor pressure
Powders
Water vapor
Thermal expansion
Silica
Oxygen
Crystalline materials
Air
Temperature

Keywords

  • Carbon
  • Coating
  • Oxidation resistance

ASJC Scopus subject areas

  • Ceramics and Composites

Cite this

Improvement in oxidation resistance of carbon by formation of a protective SiO2 layer on the surface. / Koh, Young-Hag; Kwon, Oh Sang; Hong, Seong Hyeon; Kim, Hyoun Ee; Lee, Seok Keun.

In: Journal of the European Ceramic Society, Vol. 21, No. 13, 01.11.2001, p. 2407-2412.

Research output: Contribution to journalArticle

Koh, Young-Hag ; Kwon, Oh Sang ; Hong, Seong Hyeon ; Kim, Hyoun Ee ; Lee, Seok Keun. / Improvement in oxidation resistance of carbon by formation of a protective SiO2 layer on the surface. In: Journal of the European Ceramic Society. 2001 ; Vol. 21, No. 13. pp. 2407-2412.
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