Ni-Al composite coatings: Diffusion analysis and coating lifetime estimation
Journal Article
·
· Acta Materialia
OSTI ID:755596
- Sandia National Laboratories
The interdiffusion of Ni matrix/Al particle composite coatings and nickel substrates was studied using electron probe microanalysis (EPMA) and a one-dimensional diffusion model. The initial coating microstructure was a two-phase mixture of y(Ni) and y{prime}(Ni{sub 3}Al). The coating/substrate assemblies were aged at 800 to 1,100 C for times up to 2,000 hours. It was found that aluminum losses to the substrate are significant at 1,000 C and above. The experimental results for the diffusion of Al into the substrate were compared to model predictions based on a diffusion equation for a finite layer on an infinite substrate. Using combined experimental and model results, the effects of temperature and coating thickness were determined and a rationale was developed for coating lifetime prediction.
- Research Organization:
- Sandia National Labs., Albuquerque, NM (US); Sandia National Labs., Livermore, CA (US)
- Sponsoring Organization:
- US Department of Energy (US)
- DOE Contract Number:
- AC04-94AL85000
- OSTI ID:
- 755596
- Report Number(s):
- SAND2000-1159J
- Journal Information:
- Acta Materialia, Journal Name: Acta Materialia
- Country of Publication:
- United States
- Language:
- English
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