Synthesis and Oxidation Behavior of Platinum-Enriched γ+γ' Bond Coatings on Ni-Based Superalloys

Journal Article · Sun Jan 01 04:00:00 EST 2006 · Surface and Coatings Technology

DOI:https://doi.org/10.1016/j.surfcoat.2006.07.245· OSTI ID:931258

Zhang, Ying ^[1]; Ballard, D A ^[1]; Stacy, J P ^[1]; Pint, Bruce A ^[2]; Haynes, James A ^[2]

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1. Tennessee Technological University
2. ORNL

Simple Pt-enriched {gamma}+{gamma}{prime} coatings were synthesized on Rene 142 and Rene N5 Ni-based superalloys by electroplating a thin layer of Pt followed by a diffusion treatment at 1150-1175 C. The Al content in the resulting {gamma}+{gamma}{prime} coating was in the range of 16-19 at.% on superalloys with 13-14 at.% Al. After oxidation testing, alumina scale adherence to these {gamma}+{gamma}{prime} coatings was not as uniform as to the {beta}-(Ni,Pt)Al coatings on the same superalloy substrates. To better understand the effect of Al, Pt and Hf concentrations on coating oxidation resistance, a number of Ni-Pt-Al cast alloys with {gamma}+{gamma}{prime} or {beta} phase were cyclically oxidized at 1100 C. The Hf-containing {gamma}+{gamma}{prime} alloys with 22 at.% Al and 10-30 at.% Pt exhibited similar oxidation resistance to the {beta} alloys with 50 at.% Al. An initial effort was made to increase the Al content in the Pt-enriched {gamma}+{gamma}{prime} coatings by introducing a short-term aluminizing process via chemical vapor deposition or pack cementation. However, too much Al was deposited, leading to the formation of {beta} or martensitic phase on the coating surface.

• Research Organization: Oak Ridge National Laboratory (ORNL); Shared Research Equipment Collaborative Research Center
• Sponsoring Organization: FE USDOE - Office of Fossil Energy (FE)
• DOE Contract Number: AC05-00OR22725
• OSTI ID: 931258
• Journal Information: Surface and Coatings Technology, Journal Name: Surface and Coatings Technology Journal Issue: 7 Vol. 201; ISSN 0257-8972; ISSN SCTEEJ
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ALLOYS
CHEMICAL VAPOR DEPOSITION
COATINGS
Coatings
DIFFUSION
ELECTROPLATING
HEAT RESISTING ALLOYS
OXIDATION
SUBSTRATES
SYNTHESIS
TESTING