Oxidative protection of a carbon-bonded carbon fiber composite with double-layer coating of MoSi 2 -SiC whisker and TaSi 2 -MoSi 2 -SiC whisker by slurry method

Bin Du,Shanbao Zhou,Xinghong Zhang,Changqing Hong,Qiang Qu,Chen Liu

doi:10.1016/j.ceramint.2017.04.140

Oxidative protection of a carbon-bonded carbon fiber composite with double-layer coating of MoSi 2 -SiC whisker and TaSi 2 -MoSi 2 -SiC whisker by slurry method

Bin Du, Shanbao Zhou + Show 4 more

https://doi.org/10.1016/j.ceramint.2017.04.140

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Journal: Ceramics International	Publication Date: Apr 26, 2017
Citations: 47

Affiliation: Harbin Institute of Technology, China Academy of Launch Vehicle Technology

#SiC Whiskers #Carbon-bonded Carbon Fiber Composites + Show 8 more

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Abstract This paper presents a double-layered coating system consisting of MoSi2 ceramic reinforced with SiC whiskers and a MoSi2-TaSi2 ceramic coating reinforced with SiC whiskers. This system improves oxidation resistance of carbon-bonded carbon fiber (CBCF) composites. Double-layer coating was about 160 µm in thickness and no interfaces or cracks between the layer and matrix were observed. Isothermal oxidation tests revealed that as-prepared coating presented excellent oxidation resistance, which could protect CBCF composites at 1500 °C for 160 min with 0.02% weight loss, whereas weight loss of single MoSi2 ceramic coating reinforced with SiC whiskers reached 0.08%. High-temperature resistance barrier of the glassy phase and Ta2O5 had a positive effect on improving the oxidation resistance of double-layer coating.

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