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

Ichiki, Ryuta; Nagamatsu, H.; Yasumatsu, Y.; Iwao, Tadasuke; Akamine, Shuichi; Kanazawa, Susumu

doi:10.1016/j.matlet.2011.12.054

Cited by 29 publications

(19 citation statements)

References 9 publications

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“…Second, the PA discharge can produce higher density reactive species than dielectric barrier discharges. Up to now, we have demonstrated that local nitriding is feasible by irradiating the PA plasma jet plume onto a steel surface, provided that H 2 gas is added to the operating N 2 gas [3], [4]. Here, we present effects of H 2 addition on the appearance of jet plume and the thickness of formed hard layer.…”

mentioning

confidence: 88%

Peculiar Relationship of Plume Brightness and Hard Layer Formation in Atmospheric-Pressure Plasma Jet Nitriding

Ichiki

Inoue

Yoshimitsu

et al. 2014

IEEE Trans. Plasma Sci.

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confidence: 88%

Peculiar Relationship of Plume Brightness and Hard Layer Formation in Atmospheric-Pressure Plasma Jet Nitriding

Ichiki

Inoue

Yoshimitsu

et al. 2014

IEEE Trans. Plasma Sci.

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“…For this reason, we are developing a new plasma nitriding method that is conducted under atmospheric pressure. In recent years, Ichiki et al have succeeded in hardening tool steel using a pulse-arc plasma jet under atmospheric pressure [5]. However, the thickness of the resulting nitride layer was not uniform.…”

Section: Introductionmentioning

confidence: 99%

Surface Modification of Tool Steel by Atmospheric-Pressure Plasma Nitriding Using Dielectric Barrier Discharge

et al. 2016

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The plasma nitriding of tool steel under atmospheric-pressure was performed using a dielectric barrier discharge method, resulting in the formation of a uniform nitrided layer. In this study, the tribology properties of the nitrided layer generated by atmospheric-pressure plasma nitriding were investigated. The results showed that the surface hardness of the tool steel nitrided by the atmospheric-pressure plasma method were increased by more than twofold compared with that of the core material. The surface hardness and the thickness of the nitrided layer were uniform, with values of 1300 HV and 30 m, respectively. In addition, the wear rate of the sample nitrided by the atmospheric-pressure plasma method was decreased by more than 25 times compared with that of the untreated sample. Only the emission of the N 2 second positive system and Ar were detected by the optical emission spectroscopic observation of the generated plasma. For this reason, we consider that the nitriding of this research caused by the dissociation of nonexcited N 2 , NH 3 , NH 2 , and NH etc. on the sample like a gas nitriding.

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“…Low-pressure discharge nitrogen plasma is quite indispensable as a processing plasma applied practically in various industries, such as electronics or material engineering [1,2]. It has been widely studied for material processing such as surface hardening of various metallic materials [3,4]. It is also investigated deeply because of its fundamental interests such as environmental protection [5,6], or chemical processes in the ionosphere [7] as well as astronautic applications [8].…”

Section: Introductionmentioning

confidence: 99%

Discussion on population kinetics and number densities of excited species of low‐pressure discharge nitrogen plasma

Akatsuka

Shibata

Nezu

2016

IEEJ Transactions Elec Engng

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A numerical model is constructed to calculate the number densities of some excited species of nitrogen in low-pressure discharge nitrogen plasma, together with simultaneous solution of the self-consistent electron energy distribution function and N 2 -vibration distribution function. We consider species N 2 (X), N 2 (A), N 2 (B), N 2 (C), N 2 (a), N 2 (a ), N + 2 , N + 4 , N( 4 S) and e − . In addition to electron collisional reactions, diffusion losses and molecular relations are included. It is found that the ratio of number densities of N 2 (B) and N 2 (C) states can be a good measure of the electron kinetic temperature. The N 2 (C) state is found to be almost in a corona equilibrium, whereas the N 2 (B) state becomes mainly populated by N 2 (X, v ≥ 6) + N 2 (A) reaction and depopulated by collisional relaxation by the ground-state N 2 (X) molecule.

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

Cited by 29 publications

References 9 publications

Peculiar Relationship of Plume Brightness and Hard Layer Formation in Atmospheric-Pressure Plasma Jet Nitriding

Peculiar Relationship of Plume Brightness and Hard Layer Formation in Atmospheric-Pressure Plasma Jet Nitriding

Surface Modification of Tool Steel by Atmospheric-Pressure Plasma Nitriding Using Dielectric Barrier Discharge

Discussion on population kinetics and number densities of excited species of low‐pressure discharge nitrogen plasma

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