Applications
The Kermetico HVAF AK5 was developed as an answer to a market request for a compact, low-power, high-velocity system for cermet coating. While Kermetico’s AK7 and AK6, having 200 and 130 kW of power respectively and depositing more than 26 kg (60 lbs.) per hour, are perfect for large parts, low energy dissipation surfaces need another approach.
A thermal spray process should always balance surface energy on a narrow edge between too much and too little. Too little heat will prevent or slow down coating formation. Too much heat will create excessive stress which could lead to a coating failure or even part deformation.
HVOF processes heat the substrate in the spray spot much more severely than Kermetico HVAF (Combustion is still going on in an HVOF jet, which is not present in our well-balanced HVAF process).
The most efficient way to produce an HVAF coating is by uninterrupted heat flow through the substrate, which pre-heats the surface before the jet comes in contact with it.
Most of the full-bodied parts are massive enough to dissipate the larger guns’ HVAF jet energy and prevent excess stress formation.
But when it comes to the cermet coating of thin-walled rolls, tubes, caps, hydro turbines, steam and gas turbine vanes, as well as internal surfaces of closed vessels, high energy could become your enemy.
The regulated power of 80 kW or less for the AK5 provides the option to divide energy between feedstock powder preheating, acceleration and surface preheating.
The Kermetico AK5 gun is designed to spray WCCoCr, CR3C2-NiCr, MCrAlY, Hastelloy-type and super stainless alloys onto a variety of parts:
- Rolls, 250 mm (10”) and smaller outer diameters.
- Compressor rods.
- Valve stems.
- Impellers.
- Sleeves.
- Flanges.
- Valves.
- Shafts.
- Spindles.
- Turbine vanes.
- Hydro turbines.
- Pipes.
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