Preparation and properties of HVOF NiAl nanostructured coatings

Nanostructured NiAl powder has been prepared by mechanical alloying. A high velocity, oxy-fuel (HVOF) thermal spray process has been used to deposit the agglomerated NiAl nanopowders. The coatings were characterized by means of X-ray diffraction, and scanning electron microscopy (SEM) coupled with energy dispersive spectrometry analysis (EDS). The results showed that it was possible to deposit high quality NiAl nanostructured intermetallic compound coatings. Properties of the coating regarding hardness, elastic modulus, dynamic hardness, high temperature hardness, and wear behavior were also reported.