Effect of PyC-SiC double-layer interface on ablation behaviour of impacted CVD-SiCnws/HfC coating. (October 2021)

• Record Type: Journal Article
• Authors: Tong, Mingde; Fu, Qiangang; Liang, Mingyu; Feng, Tao; Hou, Wanbo; Sun, Jia; Shi, Xinhao
• Is Part Of: Corrosion science. Volume 191(2021)
• Publication Date: 2021-10
• Subjects: Ablation -- Interface -- Ultrahigh temperature ceramic -- Impacting -- HfO2 precipitation; Corrosion and anti-corrosives -- Periodicals; 620.11223
• DOI: 10.1016/j.corsci.2021.109741
• Languages: English
• ISSNs: 0010-938X

Abstract

Highlights: Nano scale PyC-SiC double layer interface was introduced into SiCnws reinforced HfC based thermal protective coating. The impact-ablation resistance of SiCnws /HfC coating was optimized a lot after introducing PyC-SiC double layer interface. The self-sealing phenomenon of Hf-Si-O glass and precipitation of nano HfO2 grains could fill the damaged position of outer HfO2 layer. Abstract: To optimize the impact-ablation resistance of SiCnws @PyC/HfC coating, PyC-SiC double-layer interface phase was introduced. After impacting test, the crack widths of SiCnws @PyC-SiC/HfC were much lower than that of SiCnws @PyC/HfC coating. The impact-ablation resistance of SiCnws @PyC-SiC/HfC coating was better than that of SiCnws @PyC/HfC coating. The good impact-ablation resistance SiCnws @PyC-SiC/HfC coating attributed to the two-grade pull-out reinforcement effect, self-sealing function of Hf-Si-O glass generated from oxidation of SiCnws @PyC-SiC core-shell structure and the precipitation of HfO2 grains from Hf-Si-O glass under ablation environment.