Parametric effects of HVOF Process on erosion corrosion behavior of coatings-A Review
D. P. Kashyap; T. S Sidhu; S. Prakash
National Conference on Advancements and Futuristic Trends in Mechanical and Materials Engineering (AFTMME 2010)
abstract
Erosion, corrosion and abrasion, or combinations of these mechanisms are the main cause of degradation of materials used in the automobile, aircraft, power generation, chemical and pulp industries. Attempt to decrease these problems welding and electroplating have been used to applying a thin layer of erosion and corrosion resistant coatings, But these applications have been restricted by metallurgical incompatibility between the overlay and the substrate materials. Coating techniques have been given more importance in their application, however, among the different coatings techniques, high velocity oxy-fuel (HVOF) spraying process is a new and rapidly developing technology, which can yield high density coatings with porosity less than 1%, having high hardness and adhesion values, and good erosion, corrosion and wear resistance properties. The quality of coating is directly related to the spraying parameters such as spray distance or stand of distance, powder feed rate, carrier gas feed rate, oxygen-fuel ratio, substrate temperature, shroud-gas type, powder size fraction, in-flight temperature of powder particle. The purpose of this paper is to review the effects of various parameters of HVOF process on the erosion-corrosion and behavior of the coatings.
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