Abstract
Platinum-iridium films (Ir = 0,32,46,83,100 at%) were deposited on the nickel-base single crystal superalloy TMS-82+ through magnetron sputtering. After annealing and aluminizing, the Pt-Ir modified aluminide coatings mainly consisted of PtAl2 and β-(Ni,Pt,Ir)Al phases. Hot corrosion resistance of the different Pt-Ir modified aluminide coatings was evaluated through exposure at 1173 K with the Na2SO4+10 mass%NaCl salt coatings. The lowest mass gain (2.99 × 10-3 kg/m 2, after 100 h) was observed for the Pt-46Ir aluminide coating, which formed the dense and continuous protective Al2O3 scale on the surface. The effect of Ir on the corrosion resistance of Pt-Ir modified aluminide coatings was discussed from three aspects - phase transformation, protective scale formation and the role of a Pt-Ir enriched layer.
| Original language | English |
|---|---|
| Pages (from-to) | 1918-1921 |
| Number of pages | 4 |
| Journal | Materials Transactions |
| Volume | 47 |
| Issue number | 8 |
| DOIs | |
| Publication status | Published - 2006 Aug |
| Externally published | Yes |
Keywords
- Hot corrosion
- Modified aluminide coatings
- Platinum-iridium
ASJC Scopus subject areas
- Materials Science(all)
- Condensed Matter Physics
- Mechanics of Materials
- Mechanical Engineering