High Velocity Oxy-Fuel Coatings (HVOF)

Thermal spray coating technique used to create dense, well-bonded surface treatments. In this process, combustion takes place between oxygen and a fuel gas (hydrogen, argon, etc) to produce a high velocity acceleration of energy. Powder particles are then fed into the spray gun's stream and accelerated onto the substrate of the part. The powder partially melts to a molten state while in the spray path, thus creating a bond at impact. The HVOF method produces a coating that is low in porosity and has high bond strength.

Our HVOF coating method uses tightly controlled processing to apply an array of coatings, such as tungsten or chromium carbide, in place of hard chrome.

Some of the HVOF benefits are:

• Reduced oxide content
• Reduced solutioning of carbides
• Neutral or compressive stress
• Smother as-sprayed surface
• True coating uniformity
• Tensile band strength >10,000 psi.

Thermal Spray Coatings vs Hard Chrome Plate

• No hydrogen embrittlement of substrate material
• Higher hardness
• Increased wear resistance and service life
• Improved corrosion resistance
• Better bond characteristics

Corrosion Resistance
(ASTM B117-73 Salt Spray Test)

• Navy Marine Test Facility
• Key West Florida
• 18 month atmospheric exposure test
• Weekly sprayed with salt water