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The High-Pressure Cold Gas-Dynamic Spray Process
In the high-pressure process, a pressurized powder feeder forces spray feedstock into a flow of carrier gas before passing through a DeLaval (converging-diverging) nozzle to form the powder-laden jet. The spray feedstock powders are typical of those used in HVOF but custom tailored powders are also available. The carrier gas has traditionally been helium but newer systems utilize nitrogen to greatly reduce the gas cost. This gas is maintained at pressure above 30 bar and temperature of up to 900oC. The high velocities of this process make it capable of spraying some materials not possible with low-pressure cold gas-dynamic spray. And the deposition efficiency tends to also be higher – approaching 95%. Equipment for this process is manufactured by CGT – Cold Gas Technology GmbH in Ampfing, Germany. Their KINETIKS® line of equipment is available in the US from ASB Industries of Barberton, Ohio. www.asbindustries.com
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