• Title, Summary, Keyword: Electrode

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The Usability of Zinc Electrode using Wireless Measuring System of Electric Potential (무선전위측정시스템에 사용하는 아연전극 활용성 검토)

  • Lee, Jong-Rark;Leem, Sa-Hawn;Kim, Sang-O
    • Proceedings of the Korea Committee for Ocean Resources and Engineering Conference
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    • pp.177-180
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    • 2006
  • This study is to make a basic study if solid zinc (Zn) can be used for buried reference electrode, so we examined the adequacy of zinc as reference electrode by using zinc which showed regular electrode for buried period. The deference of electric potential if zinc electrode for corrosion factor such as soil resistivity or pH didn't show fixed trend and there was no clear trend on the change of measurement period. From field test, it is known that the natural electric potential difference of CSE electrode and zinc electrode is 1,100mV, but the electric potential of zinc electrode for CSE electrode in the natural soil and copying soil was 1,094~1,158mV. There was no fixed trend on the change of measurement period and electric potential difference of zinc electrode for corrosion factors such as soil resistivity or pH. Consequently, there was 40~60mV of electric potential difference in every copying soil during the experiment measurement.

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An Maximization of Ionic Wind Utilizing a Cylindrical Corona Electrode (관형 코로나 방전전극을 이용한 이온풍속의 최대화)

  • Jung, Jae-Seung;Moon, Jae-Duk
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.59 no.12
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    • pp.2256-2261
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    • 2010
  • A corona discharge system with needle point or wire type corona electrode has been well used as an ionic wind blower. The corona discharge system with a needle point electrode produces ions at lower applied voltage effectively. However, the corona discharge on the needle point electrode transits to the arc discharge at lower voltage, and it is hard to obtain the elevated electric field in the discharge airgap for enhancing the ion migration velocity due to the weak Coulomb force. A cylindrical corona electrode with sharp round tip is reported as one of effective corona electrode, because of its higher breakdown voltage than that of the needle electrode. A basic study, for the effectiveness of cylindrical electrode shape on the ionic wind generation, has been investigated to obtain an maximum wind velocity, which however is the final goal for the real field application of this kind ionic wind blower. In this paper, a parametric study for maximizing the ionic wind velocity utilizing the cylindrical corona electrode and a maximum ion wind velocity of 4.1 m/s were obtained, which is about 1.8 times higher than that of 2.3m/s obtained with the needle corona electrode from the velocity profile.

The Experimental Study of Flux Improvement of Wet Underwater Arc Welding Electrode (습식 수중 용접봉의 피복제 개발에 관한 기초연구)

  • Kim, Min-Nam;Kang, Jung-Gun
    • Journal of Ocean Engineering and Technology
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    • v.13 no.4
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    • pp.28-36
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    • 1999
  • Wet underwater arc welding process is investigated by using experimentally developed flux coated underwater arc welding electrode and SS400 steel plate of 12mm thickness as base metal. Three kinds of different flux covered wet arc welding electrode of 4mm diameter(BK-01, BK-02, BK-03) are individually developed, and one of the improved underwater welding electrode (BK-03) may be put to practical use for underwater wet arc welding process. The results obtained from this experimental study are as follows : 1. Arc stability of developed underwater wet welding electrode is better than that of the domestic covered arc welding electrode. 2. Workability of welding electrode, remove ability of slag and bead appearances using improved underwater wet welding electrode are remarkably better than that of others. 3. Heat affected zone of test specimen welded in the underwater gets to become a lot smaller than that of test specimen welded in the air, and the maximum hardness of heat affect zone of developed underwater wet welding electrode is lower to that of domestic arc welding electrode.

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Fabrications of Silver Nanowire/NiO Based High Thermal-Resistance Hybrid Transparent Electrode (은나노선/Ni 산화물 고내열성 하이브리드 투명전극의 형성)

  • Jung, Sunghoon;Lee, Seunghun;Kim, Do-Geun
    • Journal of the Korean institute of surface engineering
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    • v.50 no.6
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    • pp.486-491
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    • 2017
  • Silver nanowire (AgNW) transparent electrode is one of next generations of flexible and transparent electrode. The electrode shows high conductivity and high transparency comparable to ITO. However, the electrode is weak against heat. The wires are separated into nanodots at temperature above $200^{\circ}C$. It causes the electrical resistance increase. Moreover, it is vulnerable to oxygen and moisture in the atmosphere. The improvement of thermal and moisture resistance of silver nanowire transparent electrode is the most important for commercializing. We proposed silver nanowires transparent electrode which is capped with very thin nickel oxide layer. The nickel oxide layer is five nanometers of thickness, but the heat and moisture resistance of the transparent electrode is effectively improved. The AgNW/NiO electrode can endure at $300^{\circ}C$ of temperature for 30 minutes, and resistance is not increased for 180 hours at $85^{\circ}C$ of temperature and 85% of relative humidity. We showed an applications of transparent and flexible heater using the electrode, the heater is operated more than $180^{\circ}C$ of temperature.

Development of Discharge Electrode for Machining Connector Mold applying MIM Process (MIM 공법 적용 커넥터 금형 가공용 방전 전극 개발)

  • Shin, Kwang-Ho;Jeon, Yong-Jun;Heo, Young-Moo
    • Journal of the Korea Society of Die & Mold Engineering
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    • v.8 no.2
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    • pp.37-40
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    • 2014
  • A discharge electrode plays a role of shaving off workpiece with spark generated by current in discharge machining. Accordingly, for the discharge electrode, an electrode with excellent wear resistance is necessary. Generally, Graphite and Cu are used as the materials of the electrode, and recently Cu-W is mainly used as an electrode with excellent wear resistance. However, the form of the electrode generally used is produced mostly using cutting work, so a lot of costs incur if several similar forms are needed. Thus, this study developed a Cu-W electrode using Metal Injection Molding (MIM) process to produce similar forms with excellent productivity and a great quantity of electrodes in a similar form in discharge machining and carried out a discharge machining test. In developing an electrode applying MIM, predicting contraction of a product in a sintering process, a mold expansion ratio of 1.29486 was given, but the actual product showed a percentage of contraction 24% to 32%, which showed a difference of 3% to 5%. In addition, to verify wear resistance of the discharge electrode, abrasion loss was measured after the discharge.

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Effects of Electrode Shape on Electrode Life of Resistance Spot Welding of Mg Alloy (Mg 합금 저항 점 용접의 연속 타점 수명에 미치는 전극 형상의 영향)

  • Choi, Dongsoon;Kang, Moonjin;Ryu, Jaewook;Kim, Dongcheol
    • Transactions of the Korean Society of Automotive Engineers
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    • v.22 no.4
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    • pp.30-35
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    • 2014
  • According to weight lightning trend of automobile body, necessity of resistance spot welding (RSW) of Mg alloy on automobile industry is increasing rapidly because of the highest specific strength among commercial metals. Mg alloy has low electric resistance and high thermal conductivity like as Al alloy, so that needs applying high current in short time when welding. Thick oxide film of Mg alloy pollutes the electrodes and makes partial current carrying paths when on welding. Partial current carrying paths signify excessive concentration of current. There can initiate expulsion easily and reduces electrode life rapidly. Generating partial current carrying paths and expulsions are influenced by shapes of electrode. Therefore, electrode life also influenced by shape. In this study, we perform life test of RSW electrode of radius type. Measure tensile shear load and nugget size every spot alternately. As a result, radius type electrode can extend life over twice as dome type electrode.

The simulation on a electric field distribution of dielectric beads with a shape of ball in water (유전체 비드를 이용한 수중 방전의 전계 분포 특성 평가)

  • Lee, Dong-Hoon;Park, Honh-Jae;Park, Jae-Youn
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • pp.15-18
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    • 2003
  • In this paper, We explained the best shape design of electrode for discharge on the water. Electrode with rounding was reduced maximum electric field of over 40% to electrode without rounding for discharge on the water and the best shape of electrode for discharge on the water designed when shape of electrode had a curve radius of over $60^{\circ}$ at electrode's face to electrode's face with minimum distance and a curve radius of under $120^{\circ}$ at electrode's side face to electrode's front face. And When dielectric beads are used between electrodes, the life of electrodes is improved by lower stress of electric field on surface of electrodes.

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A Study on Ion Wind Characteristics of Acceleration Type Multipoint Electrode (가속형 다침전극의 이온풍 특성 연구)

  • Kim, Jin-Gyu
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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    • v.25 no.5
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    • pp.104-109
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    • 2011
  • In this paper, after an acceleration typed ion wind generator which could format strong electric field in air was manufactured and installed, the effects of the electrode configuration and distance of acceleration type ion wind generator with triangle structure on the ion wind generation characteristics were investigated. As a result, the ion wind generator with curvature multipoint electrode could generate higher ion wind velocity and ion wind generation yield than others with multipoint electrode, curvature line electrode, line electrode structure. The ion wind generator with curvature multipoint electrode showed a peak ion wind velocity of 1.33[m/s] at 19.0[kV] and a ion wind generation yield of 0.12[m/Ws] at 15.0[kV].

Electrical Characteristics of Porous Carbon Electrode According to NaCl Electrolyte Concentration (NaCl 전해질 농도 변화에 따른 다공질 탄소전극의 전기적 특성)

  • Kim, Yong-Hyuk
    • Journal of the Korean Institute of Electrical and Electronic Material Engineers
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    • v.23 no.10
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    • pp.814-819
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    • 2010
  • Porous carbon electrodes with wooden materials are manufactured by molding carbonized wood powder. Electrical properties of the interface for electrolyte and porous carbon electrode are investigated from viewpoint of NaCl electrolyte concentration, capacitance and complex impedance. Density of porous carbon materials is 0.47~0.61 g/$cm^3$. NaCl electrolytic absorptance of the porous carbon materials is 5~30%. As the electrolyte concentration increased, capacitance is increased and electric resistance is decrease with electric double layer effect of the interface. The electric current of the porous carbon electrode compared in the copper and the high density carbon electrode was improved on a large scale, due to a increase in surface area. The circuit current increased as the distance between of the porous carbon electrode and the zinc electrode decreased, due to increase in electric field. Experimental results indicated that the current properties of galvanic cell could be improved by using porous carbon electrode.

Effect of the Biased Third Electrode of a Wire-Plate Type Plasma Reactor on Corona Discharge and Ozone Generation Characteristics (선대 평판형 플라즈마장치의 코로나 방전 및 오존발생 특성에 미치는 바이어스된 3전극의 영향)

  • Jung, Jae-Seung;Moon, Jae-Duk
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.57 no.4
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    • pp.648-652
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    • 2008
  • Corona discharge and ozone generation characteristics of a wire-plate plasma reactor, with a biased third electrode, have been investigated with an emphasis on the role of the bias voltage and frequency applied on the third electrode. It was found that the wire-plate plasma reactor, with the biased third electrode, had a switching characteristic on its I-V characteristics for negative and positive discharges, which is very different from that of a conventional wire-plate plasma reactor without the third electrode. As a result, the corona discharge and ozone generation characteristics of the proposed plasma reactor could be controlled by adjusting the bias voltage and frequency of the third electrode. The corona onset and breakdown voltages, and ozone generation and yield, were increased compared with those of without the third electrode. These, however, reveal the effectiveness of the biased third electrode.