- High-velocity oxy-fuel coating
High-velocity oxy-fuel (HVOF) coating is a
thermal spraytechnique used to deposit protective coatingson a substrate.
A blend of fuel (gaseous or liquid) and
oxygenis injected into a torch and burned. The combustion products flow through a nozzle that accelerates the flow to a speed up to 1500 m/s. A powder feed stock is injected into the gas stream, which accelerates the powder up to 800 m/s. The stream of hot gas and powder is directed towards the surface to be coated. The powder partially melts in the stream, and deposits upon the substrate. The resulting coating has low porosityas and a high bond strength.
HVOF coatings may be as thick as 12mm (1/2"). It is typically used to deposit
wearand corrosionresistant coatings on materials. Ceramic and metallic powders can be deposited using HVOF. Common powders include WC-Co, Chromium carbide, MCrAlY, and alumina.
* Aluminide coatings
* Bond coats for
thermal barrier coatings
* Hard facing
* Hydroxyapatite (HA) coatings for medical implants
* MCrAlY coatings
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