Nanocrystalline NiAl Coating Prepared by HVOF Thermal Spraying

Nanocrystalline NiAl intermetallic powder was prepared by mechanical alloying (MA) of Ni 50 Al 50 powder mixture and then deposited on low carbon steel substrates by high velocity oxy fuel (HVOF) thermal spray technique using two sets of spraying parameters. X-ray diffraction (XRD), scanning electro...

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Bibliographic Details
Published in:Journal of thermal spray technology 2011-03, Vol.20 (3), p.440-446
Main Authors: Enayati, M. H., Karimzadeh, F., Tavoosi, M., Movahedi, B., Tahvilian, A.
Format: Article
Language:English
Subjects:
Aluminides
Analytical Chemistry
Applied sciences
Calorimetry
Characterization and Evaluation of Materials
Chemistry and Materials Science
Coating
Corrosion and Coatings
Deposition
Exact sciences and technology
Flame spraying
Hardness
Intermetallic compounds
Intermetallics
Machines
Manufacturing
Materials Science
Metals. Metallurgy
Nickel aluminides
Nickel base alloys
Nickel compounds
Peer Reviewed
Porosity
Processes
Production techniques
Spraying
Surface treatment
Surfaces and Interfaces
Thin Films
Tribology
X-ray diffraction
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Summary:Nanocrystalline NiAl intermetallic powder was prepared by mechanical alloying (MA) of Ni 50 Al 50 powder mixture and then deposited on low carbon steel substrates by high velocity oxy fuel (HVOF) thermal spray technique using two sets of spraying parameters. X-ray diffraction (XRD), scanning electron microscopy (SEM), transition electron microscopy (TEM), differential scanning calorimetry (DSC), and hardness test were used to characterize the prepared powders and coatings. The MA of Ni 50 Al 50 powder mixture led to the formation of NiAl intermetallic compound. The resulting powder particles were three dimensional in nature with irregular morphology and a crystallite size of ~10 nm. This powder was thermally sprayed by HVOF technique to produce coating. The deposited coating had a nanocrystalline structure with low oxide and porosity contents. The hardness of coatings was in the range of 5.40-6.08 GPa, which is higher than that obtained for NiAl coating deposited using conventional powders.
ISSN:1059-9630
1544-1016
DOI:10.1007/s11666-010-9588-7