• Title, Summary, Keyword: electrode material

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Development of CCFL with Nb/Ni Gad Electrode for high efficiency (Nb/Ni Clad 전극을 이용한 고효율 CCFL 개발)

  • Park, Ki-Duck;Yang, Seong-Su;Park, Doo-Sung;Kim, Seo-Yoon;Lim, Young-Jin
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • pp.441-443
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    • 2005
  • According as CCFL(Cold Cathode Fluorescent lamp) of light source in Backlight unit for Note PC (Personal computer) is presently needed to low power consumption and long life time, the development focus of CCFL is going on the discharge gas, phosphor and electrode material. First of all, discharge voltage characteristic of CCFL is closely connected with electrode material For low discharge voltage, the characteristic of electrode material is needed to low work function, low sputtering ratio and superior manufacturing property. We developed new CCFL with Nb/Ni Clad electrode superior to conventional CCFL. Because Nb/Ni Clad electrode with Ni material and Nb material, the electrical characteristic is superior to other electrode materials. The electrode of Nb/Ni Clad is composed that Ni of outside material has superior manufacturing property and Nb of inside material has low work function. Nb/Ni Clad of new electrode material is made by process of Rolling mill at high pressure and heat treatment. We compared electrical characteristic of Nb/Ni clad electrode with conventional Mo electrode by measurement. Mo electrode and Nb/Ni Clad electrode of cup type with diameter 1.1 mm and length 3.0mm are used to this experiment. Material content of Mo electrode is Mo 100%. But, Nb/Ni Clad electrode is composed by content of Nb 40% and Ni 60%. The result of comparison measurement between new CCFL with Nb/Ni Clad electrode and conventional CCFL was appeared that CCFL with Nb/Ni Clad electrode had superior characteristic than conventional CCFL. As a result of experiment, we completed Note PC with low power consumption and long life time by application of new CCFL with Nb/Ni Clad electrode.

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Characteristics of Chlorine-Based Oxidant Production on Insoluble Electrode (불용성 전극의 염소계 산화제 생성 특성)

  • Park, Mi-Jung;Lee, Taek-Soon;Kang, Meea
    • Journal of Korean Society of Water Science and Technology
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    • v.25 no.6
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    • pp.27-34
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    • 2017
  • The electrochemical water treatment process using the insoluble electrode, the chemical reaction occurs through the electrode, which is the most important factor determining the water treatment ability and treatment efficiency of the electrode. The performance characteristics of the electrode vary greatly depending on various parameters of the manufacturing process, and the oxidant generation characteristics and the current efficiency are different depending on the material of the catalyst electrode layer of the electrode. The effects of the material and composition of the catalyst electrode layer on the chlorine oxidizer formation characteristics were evaluated in order to improve the utilization of the insoluble electrode as a water treatment electrode. The ruthenium dioxide ($RuO_2$) electrode, the iridium dioxide ($IrO_2$) electrode, the platinum (Pt) electrode, and the mixed metal oxide electrode (MMO) are used in the platinum-based insoluble electrode used in the water treatment. In this study, it was confirmed that the ruthenium-based catalyst electrode layer was the most effective, especially the electrode containing palladium was more excellent as a result of comparing the production characteristics of the chlorine-based oxidizing agent for the single material electrode and the composite material electrode.

Partial Discharge Characteristics of XLPE According to Electrode Shape and Void (전극형상 및 보이드에 따른 XLPE의 부분방전 특성)

  • Shin, Jong-Yeol;Kim, Guin-sik;Hong, Jin-Woong
    • Journal of the Korean Institute of Electrical and Electronic Material Engineers
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    • v.29 no.1
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    • pp.50-57
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    • 2016
  • Transmission equipment is mainly used for the XLPE (cross-linked polyethylene) insulation cable for ultra high voltage power to minimize power loss. The experiment examined the partial discharge characteristics according to the insertion of the bar electrode and needle electrode into the XLPE specimen and the air voids. XLPE insulation cable manufactured by T. company and tungsten electrode material by K. company were used for specimens, by adhering conductive tape on the semi-conductive material of the lower electrode of XLPE specimen with the dimension of $16{\times}40{\times}30$ [mm] was used as negative electrode. In order to investigate the PD with ${\phi}$-q-n of XLPE specimen according to the electrode shape and the size of air voids. we examined the PD by varying the voltage after applying voltage of 3~20 kV on the electrode. Therefore, it was confirmed from the result of PD characteristics of specimen that the larger the air void than the gap between electrode (+) and electrode(-), the larger effect on the discharge when the bar electrode and needle electrode inserted into XLPE, and the closer the distance between the insulation and the needle electrode, the faster insulation breakdown.

Effects of the Mixing of an Active Material and a Conductive Additive on the Electric Double Layer Capacitor Performance in Organic Electrolyte

  • Yang, Inchan;Kwon, Soon Hyung;Kim, Bum-Soo;Kim, Sang-Gil;Lee, Byung-Jun;Kim, Myung-Soo;Jung, Ji Chul
    • Korean Journal of Materials Research
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    • v.25 no.3
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    • pp.132-137
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    • 2015
  • The effects of the mixing of an active material and a conductive additive on the electrochemical performance of an electric double layer capacitor (EDLC) electrode were investigated. Coin-type EDLC cells with an organic electrolyte were fabricated using the electrode samples with different ball-milling times for the mixing of an active material and a conductive additive. The ball-milling time had a strong influence on the electrochemical performance of the EDLC electrode. The homogeneous mixing of the active material and the conductive additive by ball-milling was very important to obtain an efficient EDLC electrode. However, an EDLC electrode with an excessive ball-milling time displayed low electrical conductivity due to the characteristic change of a conductive additive, leading to poor electrochemical performance. The mixing of an active material and a conductive additive played a crucial role in determining the electrochemical performance of EDLC electrode. The optimal ball-milling time contributed to a homogeneous mixing of an active material and a conductive additive, leading to good electrochemical performance of the EDLC electrode.

Thermal characteristic of PRAM with top electrode (상부전극에 따른 상변화 메모리의 발열 특성)

  • Choi, Hong-Kyw;Jang, Nak-Won;Kim, Hong-Seung;Lee, Seong-Hwan;Mah, Suk-Bum
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • pp.97-98
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    • 2007
  • In this paper, we analyzed the reset current variation of PRAM device with top electrode using the 3-D finite element analysis tool. As thickness of phase change material thin film decreased, reset current caused by phase transition highly increased. Joule's heat which was generated at the contact surface of phase change material and bottom electrode of PRAM was given off through top electrode to which was transferred phase change material. As thermal conductivity of top electrode decreased, heating temperate was increased.

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Effects of Surfactant in Semicon Electrode on Electrical Conduction of XLPE (반도전 전극에 들어 있는 계면활성제가 XLPE의 전기전도 특성에 미치는 영향)

  • 조준상;서광석;이건주
    • Journal of the Korean Institute of Electrical and Electronic Material Engineers
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    • v.13 no.3
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    • pp.227-234
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    • 2000
  • Electrical conduction characteristics of crosslinked polyethylene(XLPE) were investigated using an electrode made of semicon material containing a surfactant. When the semicon material is used as an electrode the conduction of XLPE obeys a space charge limited conduction(SCLC) mechanism which holds true for both control and surfactant-containing semicon electrodes. Conduction currents get higher with the addition of surfactant in the semicon electrodes while the charge mobility increases with the increase of surfactant content in the semicon electrode. The diffusion of surfactant molecules into the XLPE was confirmed via a $\mu$-FTIR analysis. It was found through a measurement of spatial charge distributions that the surfactant in the semicon electrodes enhances the injection of negative charge into the XLPE from the electrode. Experimental results and their origins are discussed in detail.

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Production of Te Electrode for Low Surge Vacuum Circuit Breaker (저surge 진공 차단기용 Te 전극 제조)

  • 김봉서;우병철;변우봉;이희웅
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • pp.123-128
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    • 1996
  • As electrode materials like as Cu-Pb, Cu-Bi, WC-Ag, W-Ag for vacuum circuit breaker have high chopping current or bad insulation-recovery characteristics, it can affect induction machinery like as transformer and motor. To produce low surge electrode material, it have been suggested Co-Ag-Te electrode which were infiltrated with Ag-Te intermetallic compound into sintered Co matrix in vacuum. In this paper, we would like to represent that production method and microstructure of Co-Ag-Te electrode material in each condition. The microstructure and characteristics of Ag-Te intermetallic compound and Co-(Ag-Te) electrode were investigated by using optical microscope, SEM, XRD, EPMA.

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Synthesis of Ag-Pd Electrode having Oxide Additive (산화물을 첨가한 Ag-Pd 전극의 제조)

  • Lee, Jae-Seok;Lee, Dong-Yoon;Song, Jae-Sung;Kim, Myoung-Ho
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • pp.735-738
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    • 2003
  • Downsizing electronics requires precision position control with an accuracy of sub-micron order, which demands development of ultra-fine displacive devices. Piezoelectric transducer is one of devices transferring electric field energy into mechanical energy and being capable for fine displacement control. The transducer has been widely used as fine Position control device Multilayer piezoelectric actuator, one of typical piezo-transducer, is fabricated by stacking alternatively ceramic and electrode layers several hundred times followed by cofiring process. Electrode material should be tolerable in the firing process maintaining at ceramic-sintering temperatures up to $1100{\sim}1300^{\circ}C$. Ag-Pd can be used as stable electrode material in heat treatment above $960^{\circ}C$. Besides, adding small quantity ceramic powder allow the actuator to be fabricated in a good shape by diminishing shrinkage difference between ceramic and electrode layers, resulting in avoidance of crack and delamination at and/or nearby interface between ceramic an electrode layers. This study presents synthesis of nano-oxide-added Ag/Pd powders and its feasibility to candidate material tolerable at high temperature. The powders were formed in a co-precipitation process of Ag and Pd in nano-oxide-dispersed solution where Ag and Pd precursors are melted in $HNO_3$ acid.

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Single Grained PZT Array Fabricated by Physical Etching of Pt Bottom Electrode

  • Park, Eung-Chul;Lee, Jang-Sik;Kim, Kwang-Ho;Park, Jung-Ho;Lee, Byung-Il
    • The Korean Journal of Ceramics
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    • v.6 no.1
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    • pp.74-77
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    • 2000
  • Ta-doped PZT thin films prepared by reactive co-sputtering method could be transformed into single grained perovskite structure utilizing physical etching of Pt bottom electrode. It is found that PZT perovskite phase on damaged (111) Pt electrode by IMD was more easily crystallized than random oriented Pt electrode and less crystallized than (111) Pt electrode. This shows that amorphized Pt electrode surface by IMD process has an effect on crystallization of PZT perovskite phase. 40$\mu\textrm{m}\times40\mu\textrm{m}$ square shape single grain PZT array could be obtained utilizing the difference of incubation time for nucleation of rosettes between ion damaged Pt and (111) oriented Pt electrode. Single grained PZT thin films show low leakage current density of $1\times10^{-7}$ A/$\textrm{cm}^2$ and high break down field of 440kV/cm. The loss of remanent polarization after $10^{11}$ cycles was less than 15% of initial value.

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