Improvement of the bonding strength and the oxidation resistance of SiC coating on C/C composites by pre-oxidation treatment

• Published in: Surface & coatings technology 2014-08, Vol.253, p.234-240
• Main Authors: Shan, Yu-Cai, Fu, Qian-Gang, Li, He-Jun, Fang, Qi, Liu, Xue-Song, Zhao, Ran, Zhang, Peng-Fei
• Format: Article
• Language: English
• Subjects: Adhesive strength; Applied sciences; Bonding strength; C/C composites; Carbon; Carbon-carbon composites; Chemical vapor deposition; Coating; Corrosion; Corrosion environments; Cross-disciplinary physics: materials science; rheology; Exact sciences and technology; Materials science; Metals. Metallurgy; Oxidation resistance; Physics; Pre-oxidation treatment; Production techniques; SiC coating; Silicon carbide; Surface treatment; Surface treatments
• ISSN: 0257-8972; 1879-3347
• DOI: 10.1016/j.surfcoat.2014.05.042

To improve the bonding strength and the oxidation resistance of SiC coating by chemical vapor deposition (CVD) for carbon/carbon (C/C) composites, C/C composites were modified by pre-oxidation treatment. It is found that an inlaid transition structure was obtained at the interface between SiC coating and pre-oxidized C/C composites. After pre-oxidation treatment, the interface adhesion strength increases from 23.5±3.2 to 37±2.5N, and the weight loss of the coated C/C samples is only 0.50% after oxidation at 1773K for 12h. The obvious improvement of the bonding strength and the oxidation resistance was mainly attributed to the pre-oxidation of the C/C substrate, forming an inlaid transition layer at the C/C–SiC interface during CVD process. •A porous surface structure layer was obtained by oxidation pre-treatment.•An inlaid transition structure was constructed at C/C–coating interface.•Pre-oxidation could enhance the interface bonding strength.•Pre-oxidation could improve the oxidation resistance of the coated samples.