Nitriding of steel surface by spraying pulsed-arc plasma jet under atmospheric pressure
2012
Ichiki, Ryuta | Nagamatsu, Hirokazu | Yasumatsu, Yuta | Iwao, Tadasuke | Akamine, Shuichi | Kanazawa, Seiji
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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