Acta Phys. -Chim. Sin. ›› 2012, Vol. 28 ›› Issue (01): 239-244.doi: 10.3866/PKU.WHXB201228239

• PHYSICAL CHEMISTRY OF MATERIALS • Previous Articles     Next Articles

Fabrication of a Self-Healing Pure SiC Coating by a Two-Step Technique

CHEN Yang1,2, WANG Cheng-Guo2, ZHAO Wei2   

  1. 1. Key Laboratory for Liquid-Solid Structural Evolution and Processing of Materials Ministry of Education, Shandong University, Jinan 250061, P. R. China;
    2. Carbon Fiber Engineering Research Center, Shandong University, Jinan 250061, P. R. China
  • Received:2011-07-18 Revised:2011-10-19 Published:2011-12-29
  • Contact: WANG Cheng-Guo
  • Supported by:

    The project was supported by the National Key Basic Research Program of China (973) (2011CB605601) and International Technical Cooperation Projects, China (2009DFR50600).

Abstract: A self-healing pure SiC coating was prepared on a carbon/carbon (C/C) composite by a two-step technique to protect the C/C composite from oxidation. First, SiC nanowires were obtained on the substrate surface by the thermal decomposition of hydrogen silicone oil (H-PSO). Second, a coating with a thickness of 100-200 μm was produced by infiltrating with silicon at high temperature in an argon atmosphere. The morphology and phase composition of the coating were observed by X-ray diffraction (XRD) and scanning electron microscopy (SEM). Oxidation tests were carried out on specimens and the results indicated that the obtained coating consisted of pure SiC and had a certain self-healing ability. The SiC self-healing coating significantly increased the antioxidant properties of the C/C composites and it protected the C/C composites from oxidation at 1400 °C in air over 4 h with a corresponding mass loss of only 0.71%.

Key words: C/C composite, SiC nanowire, SiC coating, Oxidation resistance, Self-healing


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