Oxidation and Mechanical Properties of SiC/SiC–MoSi2–ZrB2 Coating for Carbon/Carbon Composites

doi:10.1016/j.jmst.2013.09.006

J. Mater. Sci. Technol.

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Oxidation and Mechanical Properties of SiC/SiC–MoSi₂–ZrB₂ Coating for Carbon/Carbon Composites

Xiyuan Yao, Hejun Li, Yulei Zhang, Yongjie Wang

State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi’an 710072, China

Received:2012-09-17 Revised:2013-01-14 Online:2014-02-15 Published:2014-02-14
Contact: H. Li
Supported by:
This work was supported by the National Natural Science Foundation of China (Nos. 50902111 and 51272213), NPU Foundation for Fundamental Research, and the Research Fund of the State Key Laboratory of Solidification Processing (NWPU),China (No. 73-QP-2010).

Abstract

Abstract:

To improve oxidation resistance of carbon/carbon (C/C) composites, a SiC/SiC–MoSi₂–ZrB₂ double-layer ceramic coating was prepared on C/C composites by two-step pack cementation. The phase compositions and microstructures of as-prepared multilayer coating were characterized by X-ray diffraction and scanning electron microscopy. The oxidation resistance at 1773 K and the effect of thermal shock between 1773 K and room temperature on mechanical performance of coated specimens were investigated. The results show that the SiC/SiC–MoSi₂–ZrB₂ coating exhibits dense structure and is composed of SiC, Si, MoSi₂ and ZrB₂. It can protect C/C composites from oxidation at 1773 K for more than 510 h with weight loss of 0.5%. The excellent anti-oxidation performance of the coating is due to the formation of SiO₂–ZrSiO₄ complex glassy film. The coating can also endure the thermal shocks between 1773 K and room temperature for 20 times with residual flexural strength of 86.1%.

Key words: Carbon/carbon composites, Ceramic coating, Oxidation resistance, Thermal cycle, Mechanical properties

Xiyuan Yao, Hejun Li, Yulei Zhang, Yongjie Wang. Oxidation and Mechanical Properties of SiC/SiC–MoSi₂–ZrB₂ Coating for Carbon/Carbon Composites[J]. J. Mater. Sci. Technol., DOI: 10.1016/j.jmst.2013.09.006.

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Oxidation and Mechanical Properties of SiC/SiC–MoSi₂–ZrB₂ Coating for Carbon/Carbon Composites

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