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The improvement in oxidation resistance of carbon by a graded SiC/SiO2 coating by Oh-Sang Kwon; Seong-Hyeon Hong; Hwan Kim is a Materials Science article available to read on EtoBox.

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A dense functionally gradient SiC/SiO 2 coating has been developed to improve the oxidation resistance of carbon at elevated temperatures. SiC was coated on the surface of a graphite substrate by a reaction between thermally evaporated silicon and carbon at 1400 C. The SiO 2 layer was deposited by exposing the SiC coated specimens next to a bed of Si powder in a flowing H 2 -H 2 O gas (P H2O =2.610 À2 atm) at 1400 C. The formed SiC/SiO 2 layers were dense and had gradient compositions with good adhesion to the carbon substrate. However, as the coating thickness increased, the coating layer became cracked and delaminated from the substrate due to thermal stress. The specimens with the continuous SiC/SiO 2 layer showed a remarkably improved oxidation resistance up to 1200 C.

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Author

Oh-Sang Kwon; Seong-Hyeon Hong; Hwan Kim

Publisher

Elsevier Science; Elsevier ; Elsevier BV (ISSN 0955-2219)

Published

2003

Language

EN

Field

Materials Science (Physical Sciences)