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 language | English |
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Pages (from-to) | 4291-4299 |
Number of pages | 9 |
Journal | Corrosion Science |
Volume | 53 |
Issue number | 12 |
DOIs | |
State | Published - Dec 2011 |
Keywords
- A. Intermetallic
- A. Metal coatings
- C. Oxidation