MoSi2 modified HfC coating for the ablation protection of SiC-coated C/C composites: Ablation resistance and behavior. (15th August 2022)

• Record Type: Journal Article
• Authors: Chen, Ruicong; Zhang, Yulei; Zhang, Jian; Zhu, Xiaofei
• Is Part Of: Corrosion science. Volume 205(2022)
• Publication Date: 2022-08-15
• Subjects: Carbon/carbon composites -- SAPS -- HfC-MoSi2 coatings -- Ablation resistance -- Hf-Si-O; Corrosion and anti-corrosives -- Periodicals; 620.11223
• DOI: 10.1016/j.corsci.2022.110418
• Languages: English
• ISSNs: 0010-938X

Abstract

Abstract: To improve the ablation resistance of HfC coating, HfC-MoSi2 coatings with different MoSi2 content were prepared on SiC-coated carbon/carbon (C/C) composites by supersonic atmospheric plasma spraying (SAPS). The effects of MoSi2 content on the microstructure, phase composition and ablation behavior of HfC-MoSi2 coating were investigated. The ablation resistance of as-prepared coatings was tested under the oxyacetylene flame with a heat flux of 2.4 MW/m 2 . The results showed that the HfC-(25 vol%) MoSi2 coating exhibited better ablation resistance, and its mass and linear ablation rate are 0.23 mg/s and 0.48 µm/s, respectively. Such good performance was ascribed to the formation of Hf-Si-O compound phases, which effectively filled the diffusion channel of oxygen and improved the compactness of the coating. Highlights: In present study, the ablation resistance and behavior of the HfC-MoSi2 multiphase coatings were researched in detail. Compared other HfC multiphase coatings, MoSi2 was helpful to form Hf-Si-O phases, inhibiting the permeation of oxidizing gas. The ablation behavior of HfC-MoSi2 coatings was analyzed and HfC-25vol%MoSi2 coating showed the best ablation resistance.