Plasma nitriding treatment (ion nitriding treatment)

This is an introduction to environmentally focused nitriding treatment using plasma energy in a vacuum.

At Asahi Heat Treatment Industry Co., Ltd., we conduct environmentally conscious nitriding treatment using plasma energy in a vacuum. When a direct current voltage is applied between the furnace wall and the workpiece in the vacuum furnace, glow discharge occurs. Hydrogen and gas are used as reaction gases to initiate the glow discharge. When nitrogen gas is introduced as the nitriding reaction gas into the excited plasma, nitrogen atoms are similarly excited and converted into N+ ions. These N+ ions are charged on the surface of the workpiece, allowing activated nitrogen elements to diffuse and harden the surface. Typically, the treatment is performed under a vacuum pressure of 1 to 10 torr at temperatures ranging from 400°C to 570°C. 【Features】 ■ The heat source used for treatment is plasma, which is energy-efficient. ■ Gas concentration can be easily adjusted, allowing for the tuning of nitriding characteristics. ■ By using carburizing gas, carburizing can be performed alongside nitriding. ■ Nitriding treatment can be conducted at low temperatures below 500°C, resulting in minimal dimensional changes and distortion. ■ Masking (nitriding prevention) can be easily achieved with jigs, allowing for partial nitriding. ■ The process is pollution-free and uses very few gases that contribute to global warming. *For more details, please refer to the PDF document or feel free to contact us.

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