Effect of post-deposition heat treatment on electrodeposited NiCoCrAlY coatings
- Department of Mechanical Engineering, Tennessee Technological University, Cookeville, TN 38505-0001, USA
An electrolytic process was utilised to fabricate NiCoCrAlY coatings, involving deposition of a composite coating consisting of the (Ni,Co) matrix and CrAlY particles, followed by a diffusion heat treatment to convert the composite coating to the desired NiCoCrAlY microstructure. This study focused on the effects of the post-deposition heat-treating conditions (temperature and atmosphere) on the final coating microstructure and composition. The (Ni,Co)–CrAlY composite coatings were heat-treated for 2 h at 1000, 1100 and 1200°C in vacuum and Ar, respectively. Phase constituents and concentrations of the major elements in the coating after heat treatment were examined. Vacuum heat treatment at temperatures ≥1100°C resulted in a significant decrease in Cr content at the coating surface due to Cr evaporation. Heat treatment at 1200°C also caused outward diffusion of Ti from the substrate alloy to the coating layer.
- Sponsoring Organization:
- USDOE
- Grant/Contract Number:
- FE0007332
- OSTI ID:
- 2281452
- Alternate ID(s):
- OSTI ID: 1535378
- Journal Information:
- Surface Engineering, Journal Name: Surface Engineering Journal Issue: 2 Vol. 33; ISSN 0267-0844
- Publisher:
- SAGE PublicationsCopyright Statement
- Country of Publication:
- United Kingdom
- Language:
- English
Progress in coatings for gas turbine airfoils
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journal | October 1998 |
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