Journal
SURFACE & COATINGS TECHNOLOGY
Volume 294, Issue -, Pages 95-101Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.surfcoat.2016.03.068
Keywords
Blasting treatment; Oxyacetylene torch; SiC; Coating; Oxidation test
Funding
- National Natural Science Foundation of China [51521061, 51432008, 51222207]
- Research Fund of the State Key Laboratory of Solidification Processing (NWPU), China [12-BZ-2014]
- Program of Introducing Talents of Discipline to Universities, China (111 Project) [B08040]
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To relieve the mismatch of thermal expansion coefficient and enhance the service reliability of SiC coating efficiently, blasting treatment of C/C composites conducted by oxyacetylene torch, as a surface modification method, was used. SiC coating was prepared on the treated C/C composites by pack cementation, and an inlaid interface with different structures between SiC coating and C/C substrate was achieved. High temperature test was conducted under oxyacetylene torch, and the oxyacetylene flame was parallel to the as-received SiC coated C/C composites. After 5 thermal cycles from 1750 degrees C to room temperature, a glassy SiO2 protective layer without macro-crack was formed on the surface of the coated C/C composites with pre-blasting treatment in the heat flux of 3.2 MW/m(2). The good thermal cycle performance was attributed to the inlaid interface, which could relieve the thermal stress, improve the bonding strength and alleviate the mismatch of thermal expansion coefficient between C/C substrate and SiC coating efficiently. (C) 2016 Elsevier B.V. All rights reserved.
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