• 제목/요약/키워드: Electrode Form

검색결과 373건 처리시간 0.027초

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

  • 신광호;전용준;허영무
    • Design & Manufacturing
    • /
    • 제8권2호
    • /
    • pp.37-40
    • /
    • 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.

  • PDF

Mold 법에 의해 제작된 FED용 전계에미터어레이의 특성 분석 (Fabrication & Properties of Field Emitter Arrays using the Mold Method for FED Application)

  • 류정탁;조경제;이상윤;김연보
    • 한국전기전자재료학회:학술대회논문집
    • /
    • 한국전기전자재료학회 2001년도 하계학술대회 논문집
    • /
    • pp.347-350
    • /
    • 2001
  • A typical Mold method is to form a gate electrode, a gate oxide, and emitter tip after fabrication of mold shape using wet-etching of Si substrate. In this study, however, new Mold method using a side wall space structure is used in order to make sharper emitter tip with a gate electrode. Using LPCVD(low pressure chemical vapor deposition), a gate oxide and electrode layer are formed on a Si substrate, and then BPSG(Boro phospher silicate glass) thin film is deposited. After, the BPSG thin film is flowed into a mold as high temperature in order to form a sharp mold structure. Next TiN thin film is deposited as a emitter tip substance. The unfinished device with a glass substrate is bonded by anodic bonding techniques to transfer the emitters to a glass substrate, and Si substrate is etched using KOH-deionized water solution. Finally, we made sharp field emitter array with gate electrode on the glass substrate.

  • PDF

미세 구멍가공을 위한 전극성형 가공특성에 관한 연구 (A Study on the Characteristics of Electrode Fabrication for Micro Hole-making)

  • 이주경;이종항;박철우;조웅식
    • 대한기계학회논문집A
    • /
    • 제31권11호
    • /
    • pp.1053-1058
    • /
    • 2007
  • Micro-EDM technology (or the manufacture of miniature parts is used to make a micro hole. Two electrode shaping methods, mechanical electrode grinding and WEDG technique, have been studied. In this study, an electrode shaping method by using previously machined hole is introduced in order to obtain an optimal hole-making condition. Key factors such as applied voltage, capacitance, feedrate, and hole-dimension have an influence on the fabricating error of electrode shaping, which are taper ratio of a hole, electrode form accuracy, and electrode surface. Therefore, we try to investigate the optimal fabricating of electrode shaping from various experiments. Results from experiments, it was able to minimize the electrode fabricating error as voltage increases, and also applied feedrate and capacitance decreases.

실리콘 태양전지 투명전극용 스크린 프린팅을 이용한 구리 도금 전극 패터닝 형성 (Formation of Copper Electroplated Electrode Patterning Using Screen Printing for Silicon Solar Cell Transparent Electrode)

  • 김경민;조영준;장효식
    • 한국재료학회지
    • /
    • 제29권4호
    • /
    • pp.228-232
    • /
    • 2019
  • Copper electroplating and electrode patterning using a screen printer are applied instead of lithography for heterostructure with intrinsic thin layer(HIT) silicon solar cells. Samples are patterned on an indium tin oxide(ITO) layer using polymer resist printing. After polymer resist patterning, a Ni seed layer is deposited by sputtering. A Cu electrode is electroplated in a Cu bath consisting of $Cu_2SO_4$ and $H_2SO_4$ at a current density of $10mA/cm^2$. Copper electroplating electrodes using a screen printer are successfully implemented to a line width of about $80{\mu}m$. The contact resistance of the copper electrode is $0.89m{\Omega}{\cdot}cm^2$, measured using the transmission line method(TLM), and the sheet resistance of the copper electrode and ITO are $1{\Omega}/{\square}$ and $40{\Omega}/{\square}$, respectively. In this paper, a screen printer is used to form a solar cell electrode pattern, and a copper electrode is formed by electroplating instead of using a silver electrode to fabricate an efficient solar cell electrode at low cost.

Cu/Ni/Au 전극을 이용한 일회용 포도당 센서 개발 (Development of the disposable glucose sensor using Cu/Ni/Au electrode)

  • 이영태;이승로
    • 센서학회지
    • /
    • 제15권5호
    • /
    • pp.352-356
    • /
    • 2006
  • In this paper, we developed enzyme electrode of a new form to improve performance of disposable glucose sensor. We could fabricate electrode of Cu/Ni/Au structure which has very low electrical resistance (0.1 $\Omega$) by sticking copper film to plastic film with laminating method and electro-plated nickle and gold on it. The enzyme electrode was completed by immobilizing enzyme on the fabricated electrode. The fabricated glucose sensor has very quick sensing time as 3 seconds, and excellent reproducibility, fabrication yield as well.

A Spontaneous Growth of a Diaphorase Enzyme Layer over a Gold Electrode for the Catalytic Reduction of $NAD^+$

  • 김소형;윤세옥;강찬
    • Bulletin of the Korean Chemical Society
    • /
    • 제22권11호
    • /
    • pp.1192-1196
    • /
    • 2001
  • A diaphorase enzyme electrode for the catalytic reduction of NAD+ , the oxidized form of nicotinamide adenine dinucleotide, has been prepared. The enzyme layer grew spontaneously over an aminoethanethiol self assembled monolayer on a go ld plate electrode. The growth was accomplished by simply dipping the electrode covered by the aminoethanethiol monolayer into a solution containing both glutaraldehyde and diaphorase. We suggested that the glutaraldehyde as a cross-linking reagent was attached to the amino groups of the aminoethanethiol monolayer and the diaphorase enzyme molecules were bound to free aldehyde groups of the glutaraldehyde. Further attachments of the enzyme molecules over the bound enzyme molecules continued with the bridging of the glutaraldehyde. In frequency measurements with a quartz crystal microbalance, the frequency decrease was much more than it was for that of the enzyme monolayer formation, and an enzyme layer thicker than a monolayer was formed. The modified electrode was employed to reduce NAD+ , using diffusional methyl viologen as an electron transfer mediator. The NAD+ was electrocatalytically reduced, and the catalytic current was almost equivalent to that with the multilayered electrode of ten enzyme layers.

전극 형태에 따른 평판형 오존발생기의 특성 (The Characteristics of Plate Type Ozonizer with Variation of Electrode Form)

  • 윤병한;이창호;우성훈;이광식
    • 조명전기설비학회논문지
    • /
    • 제22권1호
    • /
    • pp.149-156
    • /
    • 2008
  • 최근 오존은 그 활용성을 인정받아 다양한 분야에서 사용되고 있으며, 그 수요 또한 계속 증가하는 추세이다. 이에 다양한 종류의 오존발생기가 연구되고 있으며, 고농도 및 고수율을 얻는 것이 연구목표라 할 수 있다. 본 논문에서는 전극 형태에 따른 평판형 오존발생기를 제작하여 원료가스의 유량 및 방전전력의 변화에 의한 오존생성농도, 오존생성량 및 오존생성수율 특성을 연구하였다.

복합형 전극을 이용한 피부의 전기저항 측정 (SKIN IMPEDANCE MEASUREMENTS USING COMPOUND ELECTRODES)

  • 우응제
    • 대한의용생체공학회:학술대회논문집
    • /
    • 대한의용생체공학회 1991년도 추계학술대회
    • /
    • pp.98-100
    • /
    • 1991
  • We studied the characteristics of the compound electrode and found that the compound electrode provides the four-electrode method in a compact form. We developed a new method of measuring the skin impedance using simple electrodes at low frequencies. At high frequencies where the effect of internal tissue impedance is not negligible, we used the compensation method using compound electrodes since they measure the voltage right under the skin. At 50 kHz, we measured the real part of the skin impedance of less than $80\;{\Omega}$ on the thorax.

  • PDF

배전선로용 접지전극 재료별 공사비의 경제성 평가 (The Valuation of Economical Efficient for Construction Cost of Ground Electrodes in Distribution Lines)

  • 심건보;김경철;이형수;박재덕;박상만
    • 한국조명전기설비학회:학술대회논문집
    • /
    • 한국조명전기설비학회 2006년도 춘계학술대회 논문집
    • /
    • pp.293-297
    • /
    • 2006
  • To receive size of same ground resistance by form of construction work of ground electrode, there is difference of amount or price of used resources, and should construct ground electrode little more effectively because appear to differ in life period according to nature of ground electrode resources, but should consider economical efficient.

  • PDF

Fabrication of Electro-active Polymer Actuator Based on Transparent Graphene Electrode

  • Park, Yunjae;Choi, Hyonkwang;Im, Kihong;Kim, Seonpil;Jeon, Minhyon
    • 한국진공학회:학술대회논문집
    • /
    • 한국진공학회 2014년도 제46회 동계 정기학술대회 초록집
    • /
    • pp.386.1-386.1
    • /
    • 2014
  • The ionic polymer-metal composite (IPMC), a type of electro-active polymer material, has received enormous interest in various fields such as robotics, medical sensors, artificial muscles because it has many advantages of flexibility, light weight, high displacement, and low voltage activation, compare to traditional mechanical actuators. Mostly noble metal materials such as gold or platinum were used to form the electrode of an IPMC by using electroless plating process. Furthermore, carbon-based materials, which are carbon nanotube (CNT) and reduced graphene-CNT composite, were used to alter the electrode of IPMC. To form the electrode of IPMC, we employ the synthesized graphene on copper foil by chemical vapor deposition method and use the transfer process by using a support of PET/silicone film. The properties of graphene were evaluated by Raman spectroscopy, UV/Vis spectroscopy, and 4-point probe. The structure and surface of IPMC were analyzed via field emission scanning electron microscope. The fabricated IPMC performance such as displacement and operating frequency was measured in underwater.

  • PDF