Kermetico AK-IDR Rotating HVAF Spray Gun Sprays Metals and Carbides onto Bores and Internal Diameters
The ID rotating HVAF spray torch is a recent development of Kermetico Inc., and it is a perfect tool for the application of coatings inside sophisticated shapes, such as elbows, square-to-round shape transition nozzles as well as for internal spraying of parts where the rotation of such parts is difficult or impossible.
They include vessels with long protruding nozzles, massive blocks of cylinders, pump housings, etc.
The ID rotating gun fits internal diameters from 100 mm (4″) and larger, up to 600 mm (2′) deep.
High-torque motors are used in the Kermetico rotators, with the entire rotating assembly mounted on the robot or linear traverse device.
HVAF Process Description and Advantages
Usually, reducing the size of HVOF ID guns leads to low particle velocity and poor coating quality.
Kermetico HVAF gun design leads to a different result.
The Kermetico HVAF AK-IDR gun is “a small rocket engine,” generating a jet of spray particles with a velocity of more than 800 m/sec even with a short nozzle, the length of which is restricted by the ID size. Such particles form dense and tough coatings.
The internal diameter tungsten carbide coatings (WC-12Co, WC-10Co-4Cr, etc.) are non-permeable to gas and have hardness 1,050-1,250 HV300.
Regardless of the high hardness, these coatings are not brittle since neither decarburization nor oxidation occurs in our low-temperature HVAF process.
The combustion temperature of air-fuel mixtures (1,800-2,100o C / 3,272-3,812°F) is ideal for gradual and precise heating of the spray particles of metals and cemented carbides to or slightly above the metal’s melting temperature. This prevents material oxidation, carbide decomposition, and formation of other coating defects. Our equipment applies many alloys without particle melting.
Features
The Kermetico HVAF ID rotating burners have three main differences from any other equipment:
- Axial powder injection through the combustion chamber provides enough time to heat the powder in size-restricted areas of small ID parts
- We spray very fine powder particles that are easier to heat and accelerate
- The lower HVAF process temperature prevents overheating of such fine particles and the sprayed coating layer
Those features allowed us to create the smallest internal diameter guns in the world, working inside pipes as long as needed to deposit high-quality tungsten carbide and metal alloy coatings.
The Kermetico HVAF AK-IDR gun is “a small rocket engine,” generating a jet of spray particles with a velocity of more than 800 m/sec even with a short nozzle, the length of which is restricted by the ID size. Such particles form dense and tough coatings.
The internal diameter tungsten carbide coatings produced (WC-12Co, WC-10Co-4Cr, etc.) are non-permeable to gas and have hardness 1,050-1,250 HV300.
Regardless of the high hardness, these coatings are not brittle since neither decarburization nor oxidation occurs in our low-temperature HVAF process.
The combustion temperature of air-fuel mixtures (1,800-2,100o C / 3,272-3,812°F) is ideal for gradual and precise heating of the spray particles of metals and cemented carbides to or slightly above the metal’s melting temperature. This prevents material oxidation, carbide decomposition, and formation of other coating defects. Our equipment applies many alloys without particle melting.
Applications
The Kermetico HVAF AK-IDR gun is a perfect tool for the application of coatings inside sophisticated shapes, such as elbows, square-to-round shape transition nozzles as well as for internal spraying of parts where the rotation of such parts is difficult or impossible.
They include vessels with long protruding nozzles, massive blocks of cylinders, pump housings, etc.
The ID rotating gun fits internal diameters from 100 mm (4″) and larger, up to 600 mm (2′) deep.
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