In this section, you can access to the latest technical information related to the FUTURE project topic.

Oxidative Ablation Behavior of W?Coated C/C Composites Prepared by Chemical Vapor Deposition with Heat Treatment

After the W coating is heat treated at 1500??C for 1?h, W2C and dense WC layers are formed at the surface and interface, respectively. During ablation, the WC covered with pyrolytic carbon overcomes its brittleness and shows better ablation resistance by forming a chemical bond with pyrolytic carbon to prevent the penetration of oxygen.To improve the ablation resistance of C/C composites, tungsten (W) coating is applied by chemical vapor deposition (CVD) technology on C/C composites. Results show that the coatings are dense, with a thickness of about 400??m. After heat treatment at a temperature of 1500??C for 1?h, the main component of coating is W2C. Additionally, a dense WC layer forms on the surface of pyrolytic carbon (PyC). The sample subjected to heat treatment remains relatively intact after ablation at 3000??C for 60?s, with a mass and linear ablation rate of 1.83???10?5?g?s?1 and 3.03???10?5?cm?s?1, respectively. The high?temperature stability of WC formed on PyC and the filling of fiber gaps to prevent oxygen penetration are the main reasons for the improved ablation resistance of W?coated C/C composites.

» Author: Zhe Zhou, Chuangfang Tao, Bin Chen, Huanyi Liao, Weiguo Mao, Zexu Sun, Xizhi Fan, Zheqiong Fan, Yuan Cheng

» Publication Date: 02/04/2023

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