CVD AND EB-PVD AS A METHODS OF THE ZIRCONIUM INTRODUCING TO THE ALUMINIDE COATINGS
- 1 Department of Materials Science, Rzeszów University of Technology, Rzeszów, Poland
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.