Formation Mechanism of Titanium Diffusion Coating on Nickel-Based Superalloy B-1900

• Main Authors: F. Shahriari, F. Ashrafizadeh, A. Saatchi
• Format: Article
• Language: fas
• Published: Isfahan University of Technology 2012-12-01
• Series: Journal of Advanced Materials in Engineering
• Subjects: titanizing; characterization; formation mechanism; diffusion coatings.
• Online Access: http://jame.iut.ac.ir/article-1-540-en.html

Although titanium has been recognized for its excellent bio-compatibility with human tissues and good corrosion resistance in some specific environments, little attention has been paid to the surface enrichment of the components by titanium. In this paper, titanium diffusion coating was formed on the surface of Ni-based alloy B-1900 via pack cementation technique and the microstructure of the coatings obtained was studied. Diffusion titanizing was carried out via pack cementation technique at 850 and 950 C for 3 hours in a mixture of commercially pure titanium, Al2O3 and NH4Cl powder. Microstructure, phase composition and concentration profile of the coatings were examined using optical and electron metallography, X-ray diffraction, and glow discharge optical spectroscopy. The results showed that Ti2Ni and AlNi2Ti were the main constituents of the coating. The formation mechanism of the coatings was also evaluated.