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조주현,김두헌,최시영,강충일,문갑영,Cho, Chu-Hyun,Kim, Doo-Hun,Choi, Si-Young,Kang, Chung-Il,Moon, Gap-Young 한국전기전자재료학회 2012 전기전자재료학회논문지 Vol.25 No.10
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.
조주현,강충일,하윤철,진윤식,이경자,이창규,Cho, Chu-Hyun,Kang, Chung-Il,Ha, Yoon-Cheol,Jin, Yun-Sik,Lee, Kyung-Ja,Rhee, Chang-Kyu 한국전기전자재료학회 2010 전기전자재료학회논문지 Vol.23 No.9
Nickel wires of 0.8 mm in diameter and 80 mm in length were electrically exploded in liquid media such as water, ethyl alcohol. The distribution of particle sizes was broad from a few micrometers to tens of nanometer. It was identified that the particles could be classified according to its sizes by using centrifugal separator. The powder prepared in distilled water showed mainly pure metallic Ni phase although a little oxide phase was observed. The powders prepared in ethyl alcohol showed complicated unknown phases, which is attributed to the compound of carbon in the organic liquid. This unknown phase was turned to pure metallic Ni phase after heat treatment.
초고압 차단기용 코일건 타입 조작기의 기술적 타당성 검토
曺柱鉉(Chu-Hyun Cho),李弘植(Hong-Sik Lee),金錫煥(Seog-Whan Kim),金永培(Young-Bae Kim),李佑暎(Woo-Young Lee),金烘?(Hong-Kyu Kim) 대한전기학회 2006 전기학회논문지C Vol.55 No.7
A novel coil gun type actuator has been proposed and tested for its possibility as an actuator for a high voltage circuit breaker by experimental method. The 20kJ capacitor bank with the electrolytic condensers was charged up to 500V and discharged to a couple of 100 turn coils connected with parallel through a thyristor switch. The repulsive force between coil and the actuator made by copper conductor of 20㎏ reached up to 23,000 N, and over 800J of energy was transferred to the kinetic energy of the conductor. The experimental results showed that the coil gun type actuator has a good possibility for the high voltage circuit breaker.
曺柱鉉(Chu-Hyun Cho),金秉杰(Byung-Geol Kim),朴相河(Sang-Ha Park),姜忠日(Chung-Il Kang),李弘植(Hong-Sik Lee),林根熙(Geun-Hie im) 대한전기학회 2006 전기학회논문지C Vol.55 No.9
The technology of wire explosion have been used to product nanopowders. A new concept was proposed to produce metallic nanosized powders, which is wire explosion in liquid media. We have exploded the Ag or Cu wires of diameter of 0.3㎜, 40㎜ long, in the de-ionized water or acetone, respectively. Electrical energy of 1.1kJ was stored in 10㎌ capacitor and released to the wires through a triggered spark gap switch. The process was observed by high-speed camera. Those images showed that the powders were generated by vapor condensation in the shell formed by shock wave in the water. The particles were directly dispersed into the water with collapse of the shell. The sizes of Ag and Cu nanopowders were evaluated to 35㎚ and 17㎚, respectively.