Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7893057 | Corrosion Science | 2018 | 9 Pages |
Abstract
Si3N4, (ZrO2+B4Câ¯+â¯Si) and (ZrB2+SiCâ¯+â¯B4Câ¯+â¯Y2O3+Al2O3) were used as precursors for in-situ formation of SiC, ZrB2-SiC and ZrB2-SiC-B4C-YAG coatings respectively. The oxidation behavior of coated C/C composites was studied by cyclic oxidation in air at temperatures between 1500â¯Â°C and 1700â¯Â°C. The SiC coating exhibited the lowest weight loss at 1500â¯Â°C and 1600â¯Â°C. After initial mass loss for two cycles of oxidation at 1500â¯Â°C, the ZrB2-SiC coating was found to provide the best protection by the precipitated ZrO2 in SiO2 glass at 1700â¯Â°C. The ZrB2-SiC-B4C-YAG coating performed well at 1700â¯Â°C with the formation of a complex YAG glass containing ZrB2/ZrO2.
Related Topics
Physical Sciences and Engineering
Materials Science
Ceramics and Composites
Authors
R.V. Krishnarao, Md. Zafir Alam, D.K. Das,