HVOF (high velocity oxygen fuel) is a coating process whereby a mixture of fuel and oxygen is combusted and sprayed at a surface. The partially melted powder is then deposited as a coating on the surface. Diffusion Alloys is able to apply a range of HVOF coatings, using either hydrogen or kerosene fuels, with our custom-made robotic facility. HVOF dovetails well with our in-house vacuum heat-treatment and shot-peening capabilities.
Our facility comprises of a 6 axis ABB IRB2400/16 robot, a two axis turntable and an MP100 control unit. Our metal treatment and coating capabilities should enable us to fill any of your coating needs.
Our HVOF applied MCrAlY coatings (M=Ni, Co or Fe) are used in gas and jet turbines both as stand-alone coatings to resist high-temperature oxidation and also as bondcoats in thermal barrier coatings (TBCs).
The function of a bondcoat is to bind the thermally insulating ceramic topcoat to the base material. It is important that a bondcoat is very well bound to the base material and it may be important for it to have a rough surface for binding to the topcoat. With our range of experience, on-site metallurgical lab and varied thermal spray capabilities we are able to meet any bondcoat requirements.
Our chromium carbide (CrC) or tungsten carbide (WC) coatings are also applied using HVOF. These hard-face coatings are used to improve wear resistance and thereby improve component life and reliability.