skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Ni-Al composite coatings: Diffusion analysis and coating lifetime estimation

Abstract

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.

Authors:
;
Publication Date:
Research Org.:
Sandia National Labs., Albuquerque, NM (US); Sandia National Labs., Livermore, CA (US)
Sponsoring Org.:
US Department of Energy (US)
OSTI Identifier:
755596
Report Number(s):
SAND2000-1159J
TRN: AH200021%%43
DOE Contract Number:  
AC04-94AL85000
Resource Type:
Journal Article
Journal Name:
Acta Materialia
Additional Journal Information:
Other Information: Submitted to Acta Materialia; PBD: 9 May 2000
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; NICKEL ALLOYS; ALUMINIUM ALLOYS; PROTECTIVE COATINGS; MICROSTRUCTURE; INTERMETALLIC COMPOUNDS; HEAT TREATMENTS; DIFFUSION; SUBSTRATES; MATHEMATICAL MODELS; TEMPERATURE DEPENDENCE; THICKNESS; SERVICE LIFE; COATING; ELECTRON MICROPROBE ANALYSIS; NI-AL SYSTEM; DIFFUSION (BULK); KINETICS

Citation Formats

SUSAN,DONALD F., and MARDER,A.R. Ni-Al composite coatings: Diffusion analysis and coating lifetime estimation. United States: N. p., 2000. Web.
SUSAN,DONALD F., & MARDER,A.R. Ni-Al composite coatings: Diffusion analysis and coating lifetime estimation. United States.
SUSAN,DONALD F., and MARDER,A.R. Tue . "Ni-Al composite coatings: Diffusion analysis and coating lifetime estimation". United States. https://www.osti.gov/servlets/purl/755596.
@article{osti_755596,
title = {Ni-Al composite coatings: Diffusion analysis and coating lifetime estimation},
author = {SUSAN,DONALD F. and MARDER,A.R.},
abstractNote = {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.},
doi = {},
journal = {Acta Materialia},
number = ,
volume = ,
place = {United States},
year = {2000},
month = {5}
}