A comparative study of two kinds of Y and Al modified silicide coatings on an Nb-Ti-Si based alloy prepared by pack cementation technique

Ping Zhang, Xiping Guo

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60 Scopus citations

Abstract

Two kinds of Y and Al modified silicide coatings on an Nb-Ti-Si based alloy were prepared by pack cementation technique. The microstructure and oxidation behavior of both coatings were studied. Both coatings had a multiple layer structure, but the outer layers were composed of either Y- and Al-doped (Nb,X)Si2 or Y-doped (Nb,X)3Si5Al2+(Nb,X)Si2 phases, respectively. The former coating could protect the substrate alloy from oxidation at 1250°C for 100h, but the latter coating could only endure for less than 20h. The scale formation mechanisms and microstructural changes of both coatings upon oxidation have been illustrated.

Original languageEnglish
Pages (from-to)4291-4299
Number of pages9
JournalCorrosion Science
Volume53
Issue number12
DOIs
StatePublished - Dec 2011

Keywords

  • A. Intermetallic
  • A. Metal coatings
  • C. Oxidation

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