Influence of annealing on the morphology and phase composition of plasma-sprayed Ni/Al coatings

Sigitas Tamulevicius; Rytis Dargis; Kestutis Slapikas; A. Meskauskas

doi:10.1117/12.344713

8 April 1999 Influence of annealing on the morphology and phase composition of plasma-sprayed Ni/Al coatings

Sigitas Tamulevicius, Rytis Dargis, Kestutis Slapikas, A. Meskauskas

Proceedings Volume 3725, International Conference on Solid State Crystals '98: Epilayers and Heterostructures in Optoelectronics and Semiconductor Technology; (1999) https://doi.org/10.1117/12.344713
Event: International Conference on Solid State Crystals '98, 1998, Zakopane, Poland

Abstract

Thermal annealing of plasma sprayed Ni/Al coatings used as the catalyst was investigated. The coatings were plasma sprayed on Cu substrate at low vacuum conditions (approximately 1 Pa) and were heated at temperatures of 600 degree(s)C and 800 degree(s)C in Ar atmosphere for 5 hours. Scanning electron microscopy and X-ray diffraction were used to study influence of annealing on the morphology and phase transformation in the Ni/Al coatings. A change of morphology of the coatings to smoother and less porous during thermal treatment was observed. Grain size number changes from n equals 5.52 for annealed coatings to n equals 5.37 and n equals 5.26 for coatings annealed at 600 degree(s)C and 800 degree(s)C, respectively. At the same time phase transformation with appearance of new alloys took place. These changes greatly influence other properties of the Ni/Al coatings.

Citation Download Citation

Sigitas Tamulevicius, Rytis Dargis, Kestutis Slapikas, and A. Meskauskas "Influence of annealing on the morphology and phase composition of plasma-sprayed Ni/Al coatings", Proc. SPIE 3725, International Conference on Solid State Crystals '98: Epilayers and Heterostructures in Optoelectronics and Semiconductor Technology, (8 April 1999); https://doi.org/10.1117/12.344713

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