Abstract
To improve the oxidation resistance of carbon/carbon (C/C) composites, a SiC/SiC+mullite/mullite coating was prepared on the surface of C/C composites by solid phase infiltration and supersonic plasma spraying. The outer coating was mainly composed of mullite phase. The isothermal oxidation test at 1 773 K and thermal shock test between 1 773 K and room temperature were carried out. The results showed that after 150 h oxidation at 1 500°C, the weight loss of the coated C/C composite was only 0.26%. The coated specimens also exhibited good thermal shock resistance, with a mass loss of 0.25% after 15 thermal shocks between 1 500°C and room temperature. The excellent anti-oxidation property of the coating was mainly attributed to high thermal stability and low oxygen diffusion rate of mullite. Besides, SiO2 could fill in the cracks in mullite coating at high temperature, which was benefit to improve the oxidation resistance.
| Original language | English |
|---|---|
| Pages (from-to) | 79-85 |
| Number of pages | 7 |
| Journal | Cailiao Kexue yu Gongyi/Material Science and Technology |
| Volume | 21 |
| Issue number | 1 |
| State | Published - Feb 2013 |
Keywords
- Anti-oxidation
- Carbon/Carbon(C/C) composites
- Mullite
- Supersonic plasma spraying