Research Progress on Nanostructured Coatings Deposited by High Velocity Oxy-fuel Thermal Spraying

Featured with very high particle velocities and relatively low particle temperatures as compared to those in the plasma spray process and other oxy-fuel thermal spray,the HVOF thermal spray provides a efficient way to produce higher adhesion dense coatings.The nanometer materials has greatly changed material properties of electronics,mechanics,magnetics,thermodynamics and optics due to their unique surface,volume and quantum size effects.Further development of nanaomaterials technology will be focused on their engineering application.The thermal spraying process is considered as a most promising method for fabricating nanostructured materials.Great progress of fabricating nanostructured by HVOF has been made according to the situation home and abroad.From domestic to foreign literatures,the research present of nanostructured coating prepared by HVOF was analyzed,the forming and combination mechanism of nanostructured coatings were also elaborated,and the existent question using HVOF thermal spray was pointed out.The bright prospect of fabricating nanostructured coatings by HVOF was preconceived.