Components in a vacuum chamber are treated in an ionized gas atmosphere at temperatures ranging from 400 to 580 °C. Depending on the application, this gas may be ammonia or some combination of nitrogen, hydrogen or methane.
Pulse power plasma nitriding occurs in the context of controlled glow discharge.
This involves directing treatment gas into the furnace. This gas is then heated by a carefully controlled recipient heating system. Through a combination of high voltage and very low pressure, the gas is converted into an electrically conductive plasma in which gas ions with high levels of kinetic energy bombard the surface of the ferritic workpiece material. This causes a layer of iron nitride to form on the surface which then reacts with more iron atoms. In its final stage, nitrogen diffuses into the workpiece and creates an extremely hard surface layer. The pressure stresses generated by this process determine the depth of this nitride layer.
The formation of a diffusion zone with a depth of up to 1 mm and a wear-oriented connecting layer which can be up to 25 microns thick are the most important physical and chemical properties of the pulse power plasma nitriding process.
The real strength of our hardening process is the scope to respond so flexibly to different type of wear.