![]() ![]() A hot grit feeder for the grit blast preparation of parts to reduce coating costs. ![]() AK-HH – a handheld gun for on-site coating.AK-IDR – a rotating ID gun to spray 4” (100 mm) and larger bores.AK-ID – an 80 mm (3.15”) and larger internal diameter spray gun.AK5 – a compact gun to spray smaller parts, thin walls and complex surfaces.AK6 – a tungsten carbide coating gun to spray a balanced mix of parts in a job shop.AK7 – a high-power gun for the thermal spray of large parts.Multi-purpose HVAF AK systems, with a range of spray guns:.CID – HVAF+HVOF system to spray WC-Co onto internal diameters.We started to design our equipment to excel in the application of tungsten carbide coatings. Most Kermetico guns are good to spray WC-12Co Coatings. Kermetico HVAF Equipment to Spray Tungsten Carbide Cobalt Coatings Uniform high hardness and ductility, low stress and porosity lead to a substantial increase of service life of parts protected with Kermetico HVAF WC-Co coatings in comparison with HVOF tungsten carbide versions. Maximum working temperature of the coatingĪ Typical Cross-Sectional Micrograph of a Kermetico HVAF WC-Co CoatingĪ Kermetico HVAF WC-12Co Tungsten Carbide Coating Typical Applications of HVAF WC-Co Coatings Heavy Abrasive Wear and Erosion Resistance: Hardness deviation from a target value, HV 300 Kermetico HVAF WC-Co Coating Properties Featureīond strength of a tungsten carbide coating to carbon steel It also reduces the production cost due to higher spray rates achieved and use of air instead of pure oxygen.Ī distinguishing feature of the Kermetico HVAF process is that spray particles are heated but preferably not fused during spraying. With the HVAF combustion temperature below 2,000 oC (3,632☏), the surface temperature of Co-, Ni- and Fe-alloy particles usually remain near their melting point.ĭepositing WC-Co coatings by the Kermetico HVAF spraying process eliminates WC coating embrittlement and improves its hardness and density. Kermetico High-Velocity Air Fuel (HVAF) systems use gas fuel and compressed air for combustion at substantially lower temperatures and produce higher velocities than HVOF coating systems. This results in coating embrittlement and subsequent reduction of its service lifetime in conditions of abrasive and erosive wear. The decomposition of WC-Co coatings is directly related to a high combustion temperature, usually more than 3,000 oC (5,432☏), as well as the presence of oxygen in HVOF combustion products. These tungsten carbide coatings af steel can be used for abrasion-resistant coatings in dry, non-corrosive environments.Īlthough HVOF technology is frequently used for WC coating applications noticeable material oxidation and WC decomposition still occur during HVOF deposition. We recommend chromium carbide coatings for higher temperature applications.Ĭoatings that contain tungsten carbide protect substrates from the negative effects of fretting, abrasive grains, particle erosion and dynamic contact with hard surfaces. The tungsten carbide WC-12Co coatings are resistant to sliding wear, impact, abrasion and fretting at temperatures up to 510☌ (950 ☏), preferably in non-corrosive media. WC-12Co thermal spray coatings are usually harder compared to coatings of WC-17Co as a result of higher tungsten carbide levels in the coating. The Properties of HVAF WC-Co Tungsten Carbide Coatings on Steel Powders are available where cobalt is replaced with nickel. HVAF and HVOF Tungsten carbide coatings are sprayed with WC-Co agglomerated and sintered powder Nominal composition Tungsten Carbide WC-Co 88/12 Feedstock Properties ![]()
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