Abstract

Zirconium was introduced to the aluminide coating by means of two methods: the EB-PVD method and the CVD method. Zirconium layers (1 and 3 µm thick) were deposited by the EB-PVD method on the pure nickel substrate. Than samples were aluminized by the CVD method. Aluminizing process leads to obtain triple zone coatings. The top ß-NiAl zone, the middle γ’-Ni₃ Al zone and the inner γ – Ni(Al) zone were observed. Intermetallic phases NiZr(NiZr₂ ) and Ni₅Zr on the border between the top and the middle zone and middle zone and thesubstrate were found. When zirconium was introduced to the aluminide coating during the CVD process a triple zone coating was obtained. It was found that zirconium is dissolved in the NiAl phase.