Articles
  • Preparation of oxidation-protective SiC coatings for C/SiC composites by pulsed chemical vapor deposition
  • Shaoming Donga,*, Haiming Wena,b, Qing Zhoua,b and Yusheng Dinga
  • a Shanghai Institute of Ceramics, Chinese Academy of Sciences, 1295 Ding-Xi Road, Shanghai 200050, P.R. China b Institute of Graduate, Chinese Academy of Sciences, Beijing 100039, P.R. China
Abstract
Single-layer SiC coatings and multilayer (C/SiC)n coatings for oxidation protection of C/SiC composites were prepared by a pulsed chemical vapor deposition (pulsed CVD) method, a modification of pulsed chemical vapor infiltration (pulsed CVI). Pulsed CVD enabled the original pores in the substrates to be filled by the coatings, which contributed to improved adhesion between the coatings and the substrates. No deposition defects were observed in the dense SiC coatings. Multilayer (C/SiC)n coatings could dissipate thermal stresses in the coatings, which reduced the number and width of micro-cracks in the coatings and accordingly improved the oxidation-protection capability of the coatings. Oxidation tests in dry air showed that the oxidation resistance of the coated composites was significantly improved compared with that of the uncoated ones.

Keywords: C/SiC composites, SiC coatings, Pulsed CVD, Oxidation.

This Article

  • 2009; 10(3): 278-285

    Published on Jun 30, 2009

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