Mullite Oxidation Resistant Coating for SiC-coated Carbon/Carbon Composites by Supersonic Plasma Spraying

doi:10.1016/j.jmst.2012.11.001

J. Mater. Sci. Technol. ›› 2013, Vol. 29 ›› Issue (1): 29-33.DOI: 10.1016/j.jmst.2012.11.001

Mullite Oxidation Resistant Coating for SiC-coated Carbon/Carbon Composites by Supersonic Plasma Spraying

Chao Ma¹⁾, Hejun Li¹⁾, Heng Wu¹⁾, Qiangang Fu¹⁾, Can Sun¹⁾, Xiaohong Shi¹⁾, Yulei Zhang¹⁾, Zhengzhong Zhang¹⁾, Jun Tao¹⁾, Zhihai Han²⁾

1) State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi’an 710072, China
2) State Key Laboratory for Mechanical Behavior of Materials, Xi’an Jiaotong University, Xi’an 710049, China

Received:2011-10-25 Revised:2011-11-17 Online:2013-01-30 Published:2013-02-04
Contact: Hejun Li
Supported by:

National Natural Science Foundation of China under Grant No. 51072166 and No. 50902111, and the “111” Project under Grant No. D08040, and NPU Foundation for Fundamental Research and the Research Fund of the State Key Laboratory of Solidification Processing (NWPU), China (Grant No.73-QP-2010).

Abstract

Abstract:

To improve the oxidation resistance of carbon/carbon (C/C) composites, mullite coating was prepared on the surface of SiC-coated C/C composites by supersonic plasma spraying. Phases and microstructures of mullite coating were characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM). The coating primarily consists of a single phase of mullite (3Al₂O₃−2SiO₂). The SEM results show that mullite coating was continuous and well bonded with the SiC inner layer without penetrating crack. Mullite coating exhibited good oxidation resistance. After 98.5 h oxidation at 1773 K and 9 thermal shock cycles between 1773 K and room temperature, the weight loss of the coated C/C composites was only 2.57%.

Key words: Mullite coating, Supersonic plasma spraying, Carbon/carbon composites, Oxidation

Chao Ma, Hejun Li, Heng Wu, Qiangang Fu, Can Sun, Xiaohong Shi, Yulei Zhang, Zhengzhong Zhang, Jun Tao, Zhihai Han. Mullite Oxidation Resistant Coating for SiC-coated Carbon/Carbon Composites by Supersonic Plasma Spraying[J]. J. Mater. Sci. Technol., 2013, 29(1): 29-33.

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Mullite Oxidation Resistant Coating for SiC-coated Carbon/Carbon Composites by Supersonic Plasma Spraying

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