Enhancement of Nitridation in Synthesis of Aluminum Nitride Nanosize Powders by Pulsed Wire Discharge

Cho, Chuhyun; Kinemuchi, Yoshiaki; Suematsu, Hisayuki; Jiang, Weihua; Yatsui, Kiyoshi

doi:10.1143/jjap.42.1763

Cited by 45 publications

(29 citation statements)

References 2 publications

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“…On the other hand, particles with diameters from 100 nm to a few micrometers in the powders synthesized by PWD have been also observed [2], [6]. We described the particles over 100 nm as submicron-sized particles.…”

Section: Introductionmentioning

confidence: 73%

“…The vapor produced by the explosion of the wire is cooled by collisions with the atmospheric molecules, and nanosized particles are formed from the condensed vapor. By PWD, not only metallic powders but also oxidized or nitrided powders can be produced by using oxygen or nitrogen as an atmospheric gas [1]- [6]. PWD is considered to be a promising and fascinating method because of its high energy-conversion efficiency and simplicity of the apparatus.…”

Section: Introductionmentioning

confidence: 99%

“…The origin of the submicron-sized particles might be attributed to the liquid droplets that were generated by the incomplete vaporization of the wire. In the syn- thesis of ceramic powders by PWD, submicron-sized particles resulted in impurity [6]. Thus, we expect that if the energy deposition in the wire increases, the number of micrometer-sized particles will be decreased.…”

Section: Introductionmentioning

confidence: 99%

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Enhancement of Energy Deposition in Pulsed Wire Discharge for Synthesis of Nanosized Powders

Cho

Murai

Suzuki

et al. 2004

IEEE Trans. Plasma Sci.

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Nanosized particles, less than 100 nm in diameter, have been successfully synthesized by pulsed wire discharge (PWD). The powders prepared by PWD contained submicron-sized particles, in the range of 0.1 m-1 m in diameter. The existence of submicron-sized particles is attributed to liquid droplets due to lower energy deposition in the wire than vaporization energy of the whole wire. The effect of the energy deposition on particle size distribution was investigated with the copper powders prepared in the atmospheric gas of nitrogen. The energies deposited in the wire were estimated by measuring the currents and voltages for various discharge conditions. Under the conditions of high atmospheric pressure and fast-current rise, the energy deposition was significantly enhanced. The energy deposition mainly affects the quantity of submicron-sized particles that originates from unvaporized liquid droplets rather than the average particle size of nanosized powders.

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Section: Introductionmentioning

confidence: 73%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Enhancement of Energy Deposition in Pulsed Wire Discharge for Synthesis of Nanosized Powders

Cho

Murai

Suzuki

et al. 2004

IEEE Trans. Plasma Sci.

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“…전기폭발에 의한 나노분말 제조기술은 펄스파워 기술이 갖는 높은 에 너지 효율 및 고순도 나노분말 제조 가능 등의 장점 을 가지고 있다 [1][2][3][4][5][6][7][8][9][10]. 액중 전기폭발 기술은 기중 전기폭발 기술에 비하여 입도 및 분산에 있어서 장점 이 있다 [11,12].…”

Section: 서 론 1)unclassified

Synthesis and Analysis of Zn Nanopowders by Wire Explosion In Liquids

Cho

Kim²,

Choi³

et al. 2012

Journal of the Korean Institute of Electrical and Electronic Ma

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Zn wires have been electrically exploded in methanol or distilled water using the pulsed power technologies. The nanopowders produced by the explosions have been observed by using SEM and TEM, and analyzed its phase by using EDS and XRD. The nanopowders produced in distilled water showed ZnO phase only. On the other hands, the nanopowder produced in methanol showed mixed phases with Zn and ZnO. The HR-TEM images of the nanopowders produced in methanol showed that the some particles have been coated with carbon like materials. It is considered that the carbon coatings could be depended on the positions of the particles during the plasma state formed by explosion.

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“…The electrical explosion of wire (EEW) has become an attractive method to fabricate the nanosized powders due to the simple and promising methods for lowcost production [10][11][12]. The wire explosion in liquids reported in recent years has been presented as a new method to prepare nanopowders with smaller size and narrower size distribution in comparison with that carried out in gas atmospheres [13].…”

Section: Introductionmentioning

confidence: 99%

Synthesis of Fe–Ni invar alloy nanopowder by the electrical explosion of wire in the liquid

Bac

Kim

2010

Res Chem Intermed

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The present work studied the synthesis of Fe-Ni Invar alloy nanopowder by the electrical explosion of wire (EEW) in deionized water. X-ray diffraction (XRD) was used to investigate the phase of the nanopowder. It indicated that the assynthesized nanopowder had c-Fe-Ni solid solution and FeO phase. Pure c-Fe-Ni phase was obtained when the as-synthesized powder was reduced under the hydrogen at 700°C for 30 min. Particle sizes of the as-synthesized and the reduced powders were observed by electron transmission microscope. The as-synthesized and the reduced nanopowders were in a nearly spherical shape with average size of 32.5 and 180 nm, respectively. The as-synthesized particles had a core-shell structure that was composed of c-Fe-Ni in the core and FeO in the shell. The alloy compositions of the wire before exploding and the reduced nanopowder determined by electron probe microanalysis were almost the same. The hysteresis loop of the as-synthesized nanopowder, the hydrogen-reduced nanopowder and the sintered sample were examined with a vibrating sample magnetometer. The sintered sample had the smallest coercivity with a value of 14.26 Oe.

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Enhancement of Nitridation in Synthesis of Aluminum Nitride Nanosize Powders by Pulsed Wire Discharge

Cited by 45 publications

References 2 publications

Enhancement of Energy Deposition in Pulsed Wire Discharge for Synthesis of Nanosized Powders

Enhancement of Energy Deposition in Pulsed Wire Discharge for Synthesis of Nanosized Powders

Synthesis and Analysis of Zn Nanopowders by Wire Explosion In Liquids

Synthesis of Fe–Ni invar alloy nanopowder by the electrical explosion of wire in the liquid

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