Abstract
Nanocrystalline NiAl intermetallic powder was prepared by mechanical alloying (MA) of Ni50Al50 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 Ni50Al50 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.
Similar content being viewed by others
References
N.S. Stoloff, C.T. Liu, and S.C. Deevi, Emerging Applications of Intermetallics, Intermetallics, 2000, 8, p 1313-1320 (in English)
K. Morsi, Reaction Synthesis Processing of Ni-Al Intermetallic Materials, Mater. Sci. Eng. A, 2001, 299, p 1-15
M.H. Enayati, A. Saidi, and Z. Sadeghian, Synthesis of Ni3Al Intermetallic Compound Under Different Mechanical Alloying Conditions, J. Eng., 2003, 15, p 23-33 (in Persian)
M.H. Enayati, Z. Sadeghian, M. Salehi, and A. Saidi, The Effect of Milling Parameters on the Synthesis of Ni3Al Intermetallic Compound by Mechanical Alloying, Mater. Sci. Eng. A, 2004, 375, p 809-811
M.H. Enayati, F. Karimzadeh, and S.Z. Anvari, Synthesis of Nanocrystalline NiAl by Mechanical Alloying, J. Mater. Process. Technol., 2008, 200, p 312-315
A. Mashreghi and M.M. Moshksar, Partial Martensitic Transformation of Nanocrystalline NiAl Intermetallic During Mechanical Alloying, J. Alloy Comp., 2009, 482, p 196-198
M. Atzmon, In Situ Thermal Observation of Explosive Compound-Formation Reaction During Mechanical Alloying, Phys. Rev. Lett., 1990, 64, p 487-490
S. Deshpande, S. Sampath, and H. Zhang, Mechanisms of Oxidation and its Role in Microstructural Evolution of Metallic Thermal Spray Coatings-Case Study for Ni-Al, Surf. Coat. Technol., 2006, 200, p 5395-5406
J.A. Hearley, J.A. Little, and A.J. Sturgeon, The Effect of Spray Parameters on the Properties of High Velocity Oxy-Fuel NiAl Intermetallic Coatings, Surf. Coat. Technol., 2000, 123, p 210-218
J.A. Hearley, J.A. Little, and A.J. Sturgeon, The Erosion Behaviour of NiAl Intermetallic Coatings Produced by High Velocity Oxy-Fuel Thermal Spraying, Wear, 1999, 233, p 328-333
W. Hu, M. Li, and M. Fukumoto, Preparation and Properties of HVOF NiAl Nanostructured Coatings, Mater. Sci. Eng. A, 2008, 478, p 1-8
G.K. Williamson and W.H. Hall, X-ray Line Broadening from Filed Aluminium and Wolfram, Acta Metall., 1953, 1, p 22-31
Author information
Authors and Affiliations
Corresponding author
Rights and permissions
About this article
Cite this article
Enayati, M.H., Karimzadeh, F., Tavoosi, M. et al. Nanocrystalline NiAl Coating Prepared by HVOF Thermal Spraying. J Therm Spray Tech 20, 440–446 (2011). https://doi.org/10.1007/s11666-010-9588-7
Received:
Revised:
Published:
Issue Date:
DOI: https://doi.org/10.1007/s11666-010-9588-7