材料科学
烧蚀
复合材料
涂层
化学气相沉积
图层(电子)
增强碳-碳
碳纤维
离格
复合数
纳米技术
医学
航空航天工程
内科学
工程类
放射治疗
作者
Guodong Sun,Hejun Li,Dongjia Yao,Hui Li,Pengfei Yu,Jing Xie,Xianqing Pan,Jize Fan,Wei Wang
标识
DOI:10.1002/adem.201800774
摘要
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.
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