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When case-hardening the surface of steel, or steel alloy parts, commonly used in the transportation industry, such as gears, crank pins, dies and camshafts, the options have traditionally included one-of-three processes: carburising, salt-bath nitrocarburising and gas nitriding. Each process has advantages and disadvantages, but those seeking more precise control of the diffusion layer formation, depth of case hardening and preservation of component dimensions, are increasingly turning to advanced pulse plasma nitriding.
Although pulse plasma has been utilised for decades, superior controls for the DC pulsing signal, along with improved chamber design and construction allow for more precise temperature control and uniform distribution of the heat zone throughout the hot-wall chamber. The result is extremely consistent and uniform nitriding batch-to-batch, with less gas consumption.
"The benefits are more precise control of the diffusion layers and its broader appeal to heat treat more diverse materials, beyond steel, that include titanium, stainless steel and even aluminium," says Thomas Palamides, Senior Product and Sales Manager at PVA TePla America.
In addition, commercial heat treat shops and high-volume part producers can now select from multiple system configurations that offer flexibility, efficiency, repeatability and throughput optimisation. As a result, global manufacturers in machined parts, tool design, die forming, die cutting, medical device manufacturing, additive manufacturing, electric vehicles, trains, electric generators and land-based power systems are now leveraging these systems to run a cleaner, more efficient operation.
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Pulse plasma nitriding improves surface treatment, wear resistance, fatigue and material performance in POLYMERS PAINT COLOUR JOURNAL - PPCJ, Vol. 210, N° 4666 (12/2020)
