High velocity oxygen fuel

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High Velocity Oxygen Fuel (HVOF) is a technique to deposit thin films on a material, and can be used to deposit layers as thick as 12mm (1/2"). Among others, it is used to deposit a wear and corrosion resistant ceramic coating on a light weight material. According to literature, HVOF is already used for coating of light-weight materials like aluminium and titanium. Among others, these materials can be coated with chromium carbide, tungsten carbide, nickel, cobalt and blends of other metallic elements.

In the process, a blend of fuel (gaseous or liquid) and oxygen is brought together to burn. The gas flow, expanding due to the shape of the nozzle, reaches a speed up to 1500 m/s. Powder, axially or radially injected in the gas flow, reaches a speed of up to 800 m/s. When the beam hits a substrate, the powder forms a coating on it. The resulting coating has a negliglible porosity as well as a high bond strength of the coating.

The technique might be placed among the thermal spray techniques.

[edit] Literature

  • "Protective coatings for titanium aluminide intermetallics", R.L. McCarron, J.C. Schaeffer, G.H. Meier, D. Berztiss, R.A. Perkins, J. Cullinan, in Titanium '92 - Science and Technology, edited by F.H. Froes and I. Caplan, 1992, TMS:Warrendale, PA, p. 1971-1978 (This article describes the formation of a coating of Ti-44Al-28Cr applied on a Ti-47Al-2Cr-4Ta substrate with HVOF)

[edit] External links


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