Fabrication of SiCN-Sc2Si2O7 coatings on C/SiC composites at low temperatures

Jia Liu, Litong Zhang, Juan Yang, Laifei Cheng, Yiguang Wang

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39 Scopus citations

Abstract

SiCN-Sc2Si2O7 environmental barrier coatings were fabricated on the surface of C/SiC composites at low temperatures by adding Li2CO3 as sintering aids. With this addition, the fabrication temperature could be lowered about 100-200°C. The shrinkage of the polysilazane-Sc2Si2O7 bars with and without Li2CO3 was tested by dilatometer. The results indicate that the shrinkage speed of the polysilazane-Sc2Si2O7 bar with Li2CO3 is faster than the one without Li2CO3, indicating that the Li2CO3 greatly promotes the sintering of polysilazane-Sc2Si2O7. Water-vapor corrosion behavior of the SiCN-Sc2Si2O7 coated C/SiC composites was carried out at 1250°C. The results reveal that the SiCN-Sc2Si2O7 coatings can effectively protect the C/SiC composites. The corrosion resistance of SiCN-Sc2Si2O7 coatings is not degraded by adding Li2CO3.

Original languageEnglish
Pages (from-to)705-710
Number of pages6
JournalJournal of the European Ceramic Society
Volume32
Issue number3
DOIs
StatePublished - Mar 2012

Keywords

  • Environmental barrier coatings
  • Lithium carbonate
  • ScSiO
  • Sintering aid

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