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A Multilayer SiC/ZrB2/SiC Ablation Resistance Coating for Carbon/Carbon Composites
Author(s) -
Sun Guodong,
Li Hejun,
Yao Dongjia,
Li Hui,
Yu Pengfei,
Xie Jing,
Pan Xianqing,
Fan Jize,
Wang Wei
Publication year - 2019
Publication title -
advanced engineering materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.938
H-Index - 114
eISSN - 1527-2648
pISSN - 1438-1656
DOI - 10.1002/adem.201800774
Subject(s) - materials science , composite material , ablation , coating , chemical vapor deposition , layer (electronics) , reinforced carbon–carbon , carbon fibers , ablative case , composite number , nanotechnology , medicine , aerospace engineering , engineering , radiation therapy
To improve the ablation resistance of carbon/carbon (C/C) composites, a new SiC/ZrB 2 /SiC multilayer coating is designed and fabricated by a three‐step method of pack cementation, supersonic plasma spraying, and low pressure chemical vapor deposition. In this study, ablation behavior of SiC/ZrB 2 /SiC coating is investigated under oxyacetylene torch environment. Oxyacetylene ablation testing results show that the linear ablation rate and mass ablation rate of SiC/ZrB 2 /SiC coated C/C composites are only −5.0 × 10 −4 mm s −1 and −9.6 × 10 −4 g s −1 , respectively, for 20 s ablation under heat flux of 2400 kW m −2 . However, the ablative linear rate of ZrB 2 /SiC coated C/C composites is 7.5 × 10 −4 mm s −1 and the ablative mass rate is zero. The better ablation resistance is mainly attributed to a molten SiO 2 –ZrO 2 hybrid glassy layer formed after ablation on the surface of the composites and acting as thermal barrier layer inhibiting inward diffusion of oxygen.