Takashi Furuki

Expanded Austenite Formation on Stainless Steel via Nitrogen/Hydrogen Atmospheric-Pressure Thermal Plasma Jet

Ryuta Ichiki, Takashi Furuki, Seiji Kanazawa

Surface layers of expanded austenite (S-phase) are formed on JIS SUS304 austenitic stainless steel by nitrogen doping using a pulsed-arc plasma jet under atmospheric pressure. The characteristics of the formed S-phase strongly depend on the fraction of hydrogen gas in the operating …

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Tribological Properties of Steel Surface Nitrided by Atmospheric-Pressure Thermal Plasma Jet

Shoho Ando, Koki Koyanagi, Ryuta Ichiki, Takefumi Otsu et autres

We performed the ball-on-disk tribological test for tool steels nitrided by the atmospheric-pressure pulsed-arc plasma jet to investigate improvement of the wear resistance. The test with an alumina ball proved that the plasma-jet nitriding decreases the wear rate approximately by half. Moreover, …

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Deepening of the Study of Corona Discharges by Recent Advances of Electrical and Optical Measurement Techniques

Seiji Kanazawa, T. Mitsui, Akihito Kuno, Takashi Furuki et autres

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大分大学理工学部技術部の科研費申請における取り組み

Yuko Iwami, Hirofumi Kumasako, Takashi Furuki, Toshitaka Matsuki et autres

チーム開発のためのGitLabを用いたWebサイト開発環境の構築

Iori Miura, Shohei Ueno, Toshitaka Matsuki, Takashi Furuki et autres

Development and Evaluation of Newly Designed Coaxial Cylindrical Plasma Reactor with Liquid Flow Control and Post-Discharge Reactions for Water Treatment

Kosuke Tachibana, Ryosuke Hanabata, Takashi Furuki, Ryuta Ichiki et autres

Water purification by non-equilibrium atmospheric pressure plasma has attracted much attention and is expected to be a next-generation method. However, general approaches to improve the energy efficiency of the water purification have not been revealed. Therefore, to investigate important factors for increasing …

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Implementation of a single-shot LIF technique for 2-D imaging of metastable nitrogen molecules in a discharge afterglow at sub-atmospheric pressures

Seiji Kanazawa, J. Mizeraczyk, Toshiaki Nakatani, Akihito Kuno et autres

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Implementation of a Single-Shot Lif Technique for 2-D Imaging of Metastable Nitrogen Molecules in a Discharge Afterglow at Sub-Atmospheric Pressures

Seiji Kanazawa, J. Mizeraczyk, Toshiaki Nakatani, Akihito Kuno et autres

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Extension of Treatable Area in Atmospheric-Pressure Plasma-Jet Nitriding

Ryuta Ichiki, N. Yagawa, Takashi Furuki, Seiji Kanazawa

A unique nitriding technique using the atmospheric-pressure plasma jet has been upgraded by extending the treatable area. The previous manner to heat up a steel sample was spraying the thermal plasma jet onto the sample surface, which could maintain the treatment temperature …

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Ignition-area extension of dielectric barrier discharge under high temperature

Ryuta Ichiki, Tomoki Komatsu, Kaito Yakushiji, Kosuke Tachibana et autres

We discovered that the ignition area of a planar dielectric barrier discharge gradually extends beyond the area of the opposite electrode when the ambient temperature increases. Even with the opposite electrode the sectional area of which is less than 1 mm 2 …

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A new measurement method of DC corona-discharge characteristics using repetitive ramp and triangular voltages

Kosuke Tachibana, Takahiro Koshiishi, Takashi Furuki, Ryuta Ichiki et autres

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Bright nitriding using atmospheric-pressure pulsed-arc plasma jet based on NH emission characteristics

Kiho Toda, Ryuta Ichiki, Yuka Kanbara, Kento Kojima et autres

Abstract Bright nitriding of a steel surface is demonstrated by an atmospheric-pressure pulsed-arc plasma jet, keeping the original metallic luster and low roughness. As the hydrogen fraction in the nitrogen–hydrogen gas mixture increases, the optical emission intensity of NH radicals decreases. Following …

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