At RADMET, we are in the business of applying coatings to worn machine parts that need reconditioning. One of the methods we use in this process is HVAF supersonic thermal spraying. Thanks to it, the applied coatings have unique properties which are difficult to obtain using other technologies.

HVAF spraying – what does it consist of?

This is one of the processes of coating carbide and metallic materials, during which a material in the form of alloy or composite powder is used. After being transferred to the torch, it undergoes superfusion at 1900-1950°C under the influence of propylene, propane, hydrogen or natural gas, and then, in the nozzle, it accelerates to supersonic speeds. When it touches the substrate, i.e. the material being treated, it turns into a stable coating with a homogeneous, slightly granular structure, which is practically unaffected by oxidation. Importantly, the coated surface does not change its original structure.

HVAF or HVOF?

Unlike the popular HVOF technology, HVAF supersonic thermal spraying is characterized by high application efficiency and less material spreading. The powder deposited on the substrate has lower porosity, is harder, more resistant to cracking and falling off. It also makes it possible to achieve a thicker coating at a much lower cost – as this process uses a mixture of compressed air and fuel instead of rather expensive liquid oxygen.

Supersonic thermal spraying – what is it used for?

HVAF technology is used primarily to recondition worn machine surfaces and to refine new surfaces. Thanks to the use of supersonic thermal spraying technology, the treated material gains high parameters of resistance to abrasion, corrosion and high temperatures.

If you are interested in machine reconditioning or improving the properties of individual parts, you are welcome to contact us.