High-velocity oxy-fuel coating


High-velocity oxy-fuel coating

High-velocity oxy-fuel (HVOF) coating is a thermal spray technique used to deposit protective coatings on a substrate.

A blend of fuel (gaseous or liquid) and oxygen is 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 porosity as and a high bond strength.

HVOF coatings may be as thick as 12mm (1/2"). It is typically used to deposit wear and corrosion resistant coatings on materials. Ceramic and metallic powders can be deposited using HVOF. Common powders include WC-Co, Chromium carbide, MCrAlY, and alumina.

Applications

* Aluminide coatings
* Bond coats for thermal barrier coatings
* Hard facing
* Hydroxyapatite (HA) coatings for medical implants
* MCrAlY coatings


Wikimedia Foundation. 2010.

Look at other dictionaries:

  • Oxy-fuel — refers to technology that burns oxygen with gaseous fuel. As compared to air, which contains 20.95% oxygen, higher temperatures can be reached using pure oxygen. Approximately the same total energy is produced when burning a fuel with oxygen as… …   Wikipedia

  • Oxy-fuel welding and cutting — Oxyacetylene redirects here. For the song, see Cubanate. Side of metal, cut by oxygen propane cutting torch …   Wikipedia

  • Thermal spraying — techniques are coating processes in which melted (or heated) materials are sprayed onto a surface. The feedstock (coating precursor) is heated by electrical (plasma or arc) or chemical means (combustion flame). Thermal spraying can provide thick… …   Wikipedia

  • steel — steellike, adj. /steel/, n. 1. any of various modified forms of iron, artificially produced, having a carbon content less than that of pig iron and more than that of wrought iron, and having qualities of hardness, elasticity, and strength varying …   Universalium

  • industrial glass — Introduction       solid material that is normally lustrous and transparent in appearance and that shows great durability under exposure to the natural elements. These three properties lustre, transparency, and durability make glass a favoured… …   Universalium


Share the article and excerpts

Direct link
Do a right-click on the link above
and select “Copy Link”

We are using cookies for the best presentation of our site. Continuing to use this site, you agree with this.