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HVOF coatings are among the most common thermal spray coatings requested in industry today. This class of coatings was first developed in the 1980s, and established a new standard for thermal spray coating density and adhesion strength. Chiefly used for high-performance alloy coatings and carbide composites, HVOF coatings are the de facto standard for wear protection and turbine-class metal-on-metal protection.
1. Carbides (Tungsten Carbide Cobalt, Tungsten Carbide Nickel Chromium, Chromium Carbide Nickel Chromium)
Carbides are the hardest and most wear-resistant HVOF thermal spray coatings. They are often used in mining, construction, oil and gas, turbine engine, and pump applications. All of these coatings consist of carbide grains (tungsten carbide, chromium carbide, or a blend of both) suspended in a metallic binder (usually cobalt or nickel chromium). These coatings are extremely hard wearing, and can provide protection even at very low thickness.
2. Nickel and Cobalt Superalloys
Coatings of Stellite and Tribaloy cobalt alloys and similar materials are designed to withstand repeated metal on metal contact, even under high load and high temperature, without galling or adhering. Coatings in this class are often used on the mating components of turbine engines, which operate at high temperature and often with substantial vibration. The coatings ensure that mating metal components continue to move freely against one another without wearing.
Where Is HVOF Thermal Spray Used?
HVOF thermal spray coatings are widely used in various industries for their excellent wear and corrosion resistance properties. Some of the common applications of HVOF coatings include:
1. Automotive Industry
HVOF coatings are used on various automotive parts such as exhaust valves, cylinder bores, and piston rings. They help to improve the performance of engines by reducing friction and wear.
2. Aerospace Industry
HVOF coatings are used on aircraft turbine blades to protect them from particle erosion encountered during operation.
3. Oil and Gas Industry
HVOF coatings are used on valves and other components in the oil and gas industry to protect them from erosion and wear.
4. Medical Industry
HVOF coatings are used on medical implants such as hip joints and knee replacements. They enhance the surface of these components to promote bone growth.
HVOF coatings are denser than other thermal spray coatings. An HVOF gun creates a gas stream with a velocity higher than the speed of sound, much like a fighter jet engine, but of course much smaller. This super fast gas jet accelerates coatings particles to very high speeds so that they impact the substrate with tremendous force. This high velocity and high impact force causes the deposited material to compress and densify, reducing or removing the pores and gaps that would otherwise form using other thermal spray methods.
The high density and tight bonding of
HVOF coatings has two primary advantages:
Conclusion
The HVOF process can provide many benefits for components. These benefits include improved wear resistance, corrosion resistance, appearance, and performance.
If you are looking for
coatings for steel parts in the USA, then you can get them from us at Hayden Corporation. We offer thermal spray coating, as well as hardface welding and machining. Get in touch with us for more information.
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