Nitriding of steel surface by spraying pulsed-arc plasma jet under atmospheric pressure

Ichiki, Ryuta; Nagamatsu, Hirokazu; Yasumatsu, Yuta; Iwao, Tadasuke; Akamine, Shuichi; Kanazawa, Seiji

Nitriding of steel surface by spraying pulsed-arc plasma jet under atmospheric pressure

2012

Surface hardening of steel has been achieved by nitriding using an atmospheric-pressure plasma. Spraying the pulsed-arc nitrogen plasma jet onto a steel surface produces the diffusion layer and the compound layer, provided that hydrogen gas is added to the ambient nitrogen atmosphere. The entire surface of a disk sample of 20mm in diameter can be hardened although the thickness of the hardened layer is less where the distance from the center of jet spraying is larger.

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