Abstract
SiC/Cr-Al-Si anti-oxidation coating on the surface of carbon-carbon composites is prepared by two-step pack cementation method. The phase compositions, microstructure and element distribution on the section of samples of the received SiC/Cr-Al-Si coating are studied by XRD, SEM, and the isothermal oxidation test of samples in air is finished at 1500°C. The study results show that a SiC/Cr-Al-Si coating of 120 mm thickness is obtained, which consists of mainly three phases of SiC, AlCr 2Si and Al 4Si 2C. Compared with the SiC coating prepared by one-step pack cementation method, the SiC/Cr-Al-Si coating prepared by two-step pack cementation method shows better oxidation resistance. The weight loss of the carbon-carbon sample with SiC/Cr-Al-Si coating is less than 5% after oxidizing for 12 hours. There are microcracks in the SiC/Cr-Al-Si coating, which is thought the main reason why the received SiC/Cr-Al-Si coating failed. In the secondary pack cementation, Cr-Al-Si diffuses into SiC coating but not covers on SiC coating, which is though the other reason why the received SiC/Cr-Al-Si coating failed.
| Original language | English |
|---|---|
| Pages (from-to) | 89-92 |
| Number of pages | 4 |
| Journal | Xi'an Shiyou Daxue Xuebao (Ziran Kexue Ban)/Journal of Xi'an Shiyou University, Natural Sciences Edition |
| Volume | 24 |
| Issue number | 2 |
| State | Published - 2009 |
Keywords
- Carbon/carbon (C/C) composites
- Cr-Al-Si coating
- Oxidation resistant coating
- SiC coating
- Two-step pack cementation method
Fingerprint
Dive into the research topics of 'Preparation of SiC/Cr-Al-Si coating for C/C composites by two-step pack cementation method'. Together they form a unique fingerprint.Cite this
- APA
- Author
- BIBTEX
- Harvard
- Standard
- RIS
- Vancouver