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  4. № 11/12 2010
  5. P. 54

Properties of Intermetallic Ni–Al Coatings Formed by High-Velocity Air-Fuel Spraying

Y.Evdokimenko,
 
V.Kisel,
 
S.Buchakov,
 
A.Rogozinskaya,
 
D.Yurchenko,
 
R.Lytvyn
 

I. M. Frantsevich Institute for Problems of Materials Science of the NAS of Ukraine, Omeliana Pritsaka str.,3, Kyiv, 03142, Ukraine
Powder Metallurgy - Kiev: Frantsevich Institute for Problems of Materials Science NASU, 2010, #11/12
http://www.materials.kiev.ua/article/1693

Abstract

The formation of intermetallic Ni–Al coatings by high-velocity air-fuel (HVAF) spraying is considered. The optimum grain-size composition of NiAl and Ni3Al powders is determined from calculation of the energy state of particles. The properties of HVAF-sprayed coatings made of commercial powders PN85Yu15 and PTYu5N and test powder HAC deposited on steel, copper, and aluminum substrates are analyzed. The phase composition and structure of the coatings are presented. The properties of the coatings (porosity less than 1.5%, adhesion with steel substrate 44–57 MPa) are as good as those of the coatings produced with other gas-deposition methods. The microstructure of the coatings shows that it consists of mainly coarse solid and partially fine liquid particles.


ADHESION STRENGTH, GAS-THERMAL COATINGS, HIGH-VELOCITY AIR-FUEL SPRAYING, INTERMETALLID, NICKEL ALUMINIDES, POROSITY, STRUCTURE

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