Ablative property of HfC-based multilayer coating for C/C composites under oxy-acetylene torch

• Published in: Applied surface science Vol. 257; no. 10; pp. 4760 - 4763
• Main Authors: Wang, Yong-Jie, Li, He-Jun, Fu, Qian-Gang, Wu, Heng, Yao, Dong-Jia, Wei, Bing-Bo
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier B.V 01.03.2011; Elsevier
• Subjects: Ablation; C/C composites; Chemical vapor deposition; Condensed matter: electronic structure, electrical, magnetic, and optical properties; Condensed matter: structure, mechanical and thermal properties; Cross-disciplinary physics: materials science; rheology; Exact sciences and technology; HfC; Physics; HfC; Ablation; Chemical vapor deposition; C/C composites; CVD; Multilayers; Composite materials; Film growth
• ISSN: 0169-4332; 1873-5584
• DOI: 10.1016/j.apsusc.2010.11.020

To improve ablation resistance of C/C composites, HfC-based coating and SiC coating were prepared on the surface of C/C composites by chemical vapor deposition. The coating exhibits dense surface and outstanding anti-ablation ability. Compared with uncoated C/C, the linear and mass ablation rates of the coated C/C decreased by 33.3% and 66.7%, respectively, after ablation for 20s. The residual oxides can prevent oxygen from diffusing inwardly; large amounts of heat can be taken away by the gas generated during ablation, which is also helpful for protection.