Oxidation and ablation protection of plasma sprayed LaB 6 -MoSi 2 -ZrB 2 coating for carbon/carbon composites

Changcong Wang, Kezhi Li, Qinchuan He, Danyang He, Caixia Huo, Yangyang Su, Xiaohong Shi, Hejun Li

Research output: Contribution to journalArticlepeer-review

62 Scopus citations

Abstract

To improve the high-temperature stability of carbon/carbon (C/C) composites, a LaB 6 -MoSi 2 -ZrB 2 (LMZ) coating was deposited on SiC-encapsulated C/C composites by supersonic atmospheric plasma spraying. The sprayed LMZ coating showed a significant improvement of oxidation and ablation protective abilities relative to MoSi 2 and ZrB 2 coatings, which could protect C/C composites for more than 80 h at 1773 K in static air and 60 s above 2000 K under oxyacetylene flame. La and Zr acted as the role in accelerating the liquid phase sintering of SiO 2 -based oxides, forming a compact Si-Zr-La-O compound scale to enhance the high-temperature stability of LMZ coating.

Original languageEnglish
Pages (from-to)57-68
Number of pages12
JournalCorrosion Science
Volume151
DOIs
StatePublished - 1 May 2019

Keywords

  • Ablation
  • Carbon/carbon composites
  • Coating
  • Oxidation

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