Hf Modified NiAl Bond Coat for Thermal Barrier Coating Application

Abstract:

The Hf doped NiAl coatings were co-evaporated and co-deposited onto the superalloy substrate by electron beam physical vapor deposition (EB-PVD). During heat-treatment, HfO2 was formed on the NiAl coatings. And, Hf enriched at the interface between the coating and the interdiffusion zone, which could prevent outward diffusion of elements in the substrate. The NiAl coating doped with 0.5% Hf effectively improved the high temperature oxidation resistance compared to the Hf free NiAl coating and the high Hf content coating. Also, the addition of Hf to the coating contributed to enhancing the adherence of TGO layer to coating.

• Periodical: Materials Science Forum (Volumes 546-549)
• Pages: 1777-1780
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.546-549.1777
• Online since: May 2007
• Authors: Li Dong Sun, Hong Bo Guo, He Fei Li, Sheng Kai Gong
• Keywords: Electron Beam Physical Vapor Deposition (EB PVD), Nickel Aluminide, Thermal Barrier Coating (TBC)

References

[1] A.G. Evans, D.R. Mumm, J.W. Hutchinson, G.H. Meier, F.S. Pettit: Progress in Materials Science 46(2001), 505-553.

DOI: 10.1016/s0079-6425(00)00020-7

[2] C. Leyens, U. Schulz, B.A. Pint, I.G. Wright: Surface&Coating Technology 120-121(1999)68-76.

[3] J.A. Haynes, M.J. Lance, B.A. Pint, I.G. Wright: Surface&Coating Technology 146-147(2001) 140-146.

[4] H.B. Guo, S. Kuroda and H. Murakami: Thin Solid Films, Vol. 506-507 (2006), p.136. 0 50 100 150 200 250 300 350.

0.

2.

4.

6.

8.

[1] 0.

[1] 2.

[1] 4.

[1] 6.

[1] 8.

[2] 0.

[2] 2 Mass gein (mg/cm2) Time (hours) NiAl+0. 5%Hf NiAl+1. 5%Hf NiAl Fig. 8. Mass gains of NiAl coatings at 1150˚C.