DALcote family of coatings are applied via HVOF (high velocity oxygen fuel) 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.

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.

HVOF coatings

Our DALcote - M 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 DALcote - C chromium carbide (CrC) or DALcote - W 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.