Abstract
Cr-Al-Si coating was prepared on the surface of SiC coated C/C composites by the plasma spraying method. The phase composition and microstructure of Cr-Al-Si coating were studied by XRD and SEM. The isothermal oxidation test at 1500°C was carried out in air. The XRD results show that the outer Cr-Al-Si alloy coating consists of Al3.21Si0.47, Cr3Si and Al2O3. The thickness of the coating was about 120μm, and no penetrable crack was observed in the cross-sectional SEM morphologies of the coating. The oxidation resistance of the single porous β-SiC coating is poor, which can only protect C/C composites from oxidation for 10h with a mass loss of 10%. After adding the Cr-Al-Si alloy outer coating, the double-layer Cr-Al-Si and SiC show a better oxidation protective ability and 5.3% mass loss of the coated sample after oxidation for 61h.
| Original language | English |
|---|---|
| Pages (from-to) | 109-112 |
| Number of pages | 4 |
| Journal | Fuhe Cailiao Xuebao/Acta Materiae Compositae Sinica |
| Volume | 24 |
| Issue number | 5 |
| State | Published - Oct 2007 |
Keywords
- Anti-oxidation coating
- Carbon/carbon composites
- Cr-Al-Si
- Plasma spraying