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Open AccessArticle

A New Assistant Method for Characterizing Ablation Resistance of ZrC-SiC Dispersive Biphasic Coating on C/C Composites

1
School of Mechanics, Civil Engineering & Architecture, Northwestern Polytechnical University, Xi’an 710072, Shaanxi, China
2
State Key Laboratory of Solidification Processing, Shaanxi Key Laboratory of Fiber Reinforced Light Composite Materials, Northwestern Polytechnical University, Xi’an 710072, Shaanxi, China
*
Author to whom correspondence should be addressed.
Coatings 2019, 9(11), 735; https://doi.org/10.3390/coatings9110735
Received: 19 August 2019 / Revised: 13 October 2019 / Accepted: 16 October 2019 / Published: 6 November 2019
To optimize the ablation resistance of ZrC coating, ZrC-SiC dispersive biphasic coating was prepared by chemical vapor co-deposition. The ablation resistances of the coatings were carried out by oxyacetylene flame tests. Compared with double-layered ZrC/SiC coating, the ablation resistance of ZrC-SiC coating was evaluated. On the basis of similar mass ablation rates of the two coatings, a new assistant method for characterizing the thermal protecting effect of coatings on carbon-carbon composites (C/C) composites was proposed. The thermal protecting ability of the coating was accurately reflected by the changes of hardness and elastic modulus of C/C substrate below the central region of ablated coatings before and after ablation. The ablation processes of two kinds of coatings were also discussed. The results showed that the hardness and elastic modulus of the C/C substrate protected by ZrC-SiC coating were higher than that of C/C coated with ZrC/SiC coating. The result convincingly illustrated the thermal protecting ability of ZrC-SiC coating was much better than that of ZrC/SiC coating, which attributed to the formation of Zr-Si-O glass. View Full-Text
Keywords: ZrC-SiC coating; chemical vapor deposition; ablation resistance; ultrahigh temperature ceramic ZrC-SiC coating; chemical vapor deposition; ablation resistance; ultrahigh temperature ceramic
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MDPI and ACS Style

Feng, T.; Tong, M.; Yao, S.; Wen, S. A New Assistant Method for Characterizing Ablation Resistance of ZrC-SiC Dispersive Biphasic Coating on C/C Composites. Coatings 2019, 9, 735.

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