Oxidation resistant graded multiphase coating for carbon/carbon composites

Xuanru Ren, Hejun Li, Qiangang Fu, Yanhui Chu, Kezhi Li

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35 Scopus citations

Abstract

A double layer TaB2-TaSi2-SiC-Si/TaC-SiC coating was prepared on the surface of C/C composites to improve the oxidation resistance of the composites, which was prepared by in situ reaction method through pack cementation technique. The phase composition and microstructures of the multiphase coating were characterized by XRD and SEM-EDS. The inner coating is composed of TaC and SiC, while the outer multiphase coating is composed of TaB2, TaSi2, SiC and Si. The multilayer coating is about 200μm in thickness and does not display penetrating crack or big cavities. The coating could protect C/C from oxidation at 1773K in air for 330h with only 0.9% weight loss, thanks to the formed silicate glass layer containing SiO2 and tantalum oxides.

Original languageEnglish
Pages (from-to)821-826
Number of pages6
JournalSurface and Coatings Technology
Volume232
DOIs
StatePublished - 15 Oct 2013

Keywords

  • Carbon/carbon composites
  • Coating
  • Oxidation resistance
  • TaB
  • TaC

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