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Yttrium silicate oxidation protective coating for SiC coated carbon/carbon composites
- Source :
-
Ceramics International . May2006, Vol. 32 Issue 4, p417-421. 5p. - Publication Year :
- 2006
-
Abstract
- Abstract: Four kinds of yttrium silicate oxidation protective coatings SiO2·Y2O3, 1.5SiO2·Y2O3, 1.5SiO2·Y2O3/SiO2·Y2O3 and 2SiO2·Y2O3/1.5SiO2·Y2O3/SiO2·Y2O3 were prepared by plasma spray on the surface of SiC pre-coated carbon/carbon composites. The structures of the coatings were characterized by XRD, SEM and EDS analyses. It was shown that the gradied 2SiO2·Y2O3/1.5SiO2·Y2O3/SiO2·Y2O3 multi-layer coating had better high-temperature oxidation resistance. It could protect carbon/carbon composites from oxidation at 1773K in air for 73h with a weight loss of less than 2%. The oxidation activation energy of the coated carbon/carbon composites is 87.3kJ/mol, and the oxidation process in C/C substrates with a multi-layer coating was controlled by the rate of oxygen diffusion through the holes in the coating. [Copyright &y& Elsevier]
- Subjects :
- *YTTRIUM
*SILICATES
*OXIDATION
*SILICON oxide
*SILICON carbide
Subjects
Details
- Language :
- English
- ISSN :
- 02728842
- Volume :
- 32
- Issue :
- 4
- Database :
- Academic Search Index
- Journal :
- Ceramics International
- Publication Type :
- Academic Journal
- Accession number :
- 19930144
- Full Text :
- https://doi.org/10.1016/j.ceramint.2005.03.018