• 제목/요약/키워드: soldering process

검색결과 144건 처리시간 0.031초

절연절단법을 이용한 프로브 빔의 제작 (Fabrication of Probe Beam by Using Joule Heating and Fusing)

  • 홍표환;공대영;이동인;김봉환;조찬섭;이종현
    • 센서학회지
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    • 제22권1호
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    • pp.89-94
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    • 2013
  • In this paper, we developed a beam of MEMS probe card using a BeCu sheet. Silicon wafer thickness of $400{\mu}m$ was fabricated by using deep reactive ion etching (RIE) process. After forming through silicon via (TSV), the silicon wafer was bonded with BeCu sheet by soldering process. We made BeCu beam stress-free owing to removing internal stress by using joule heating. BeCu beam was fused by using joule heating caused by high current. The fabricated BeCu beam measured length of 1.75 mm and width of 0.44 mm, and thickness of $15{\mu}m$. We measured fusing current as a function of the cutting planes. Maximum current was 5.98 A at cutting plane of $150{\mu}m^2$. The proposed low-cost and simple fabrication process is applicable for producing MEMS probe beam.

산화아연소자의 성형공정에 따른 전기적 특성과 성능평가 (Electrical Characteristics and Performance Evaluation with Manufacturing Process of Zinc Oxide Varistors)

  • 조한구;윤한수;김석수;최인혁
    • 한국전기전자재료학회논문지
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    • 제19권11호
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    • pp.1061-1066
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    • 2006
  • This paper presents the electrical characteristics with manufacturing process and performance evaluation of high performance zinc oxide varistors. ZnO varistors were fabricated with typical ceramic production methods with different thickness and the structural and electrical characteristics of ZnO varistors were investigated. All varistors exhibited high density, which was in the range of $5.41{\sim}5.49g/cm^3$. In the electrical properties, the reference voltage increased in the range of $4.410{\sim}5.250kV$ with increasing their thickness and the residual voltage exhibited the same trends as the reference voltage. In the long duration current impulse withstand test, E-2 and F-1 samples failed at the two and four shots of impulse current, respectively, but E-1 and F-2 samples survived 18 shots during the test. Before and after this test, the variation ratio of residual voltage of E-1 and F-2 samples were -0.34 % and 0.05 %, respectively, which were in the acceptance range of 5 %. According to the results of tests, it is thought that if the fabrication process such as insulating coating, sintering condition, and soldering method is improved, these ZnO varistors would be possible to apply to the station class arresters in the near future.

플럭스가 점착된 솔라 리본 건조 연구 (A Study on the Drying Performance of the Flux Adhered to Photovoltaic Ribbon)

  • 조남철;전용한;한상필;김동춘;이채문;전택종
    • 한국태양에너지학회 논문집
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    • 제35권1호
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    • pp.29-34
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    • 2015
  • The photovoltaic ribbon attached the flux reduces the solar module manufacturing process and the pollution. This paper presents an analytical method for solving the continuous flux drying system of photovoltaic ribbon. Also, some experiments of the drying of photovoltaic ribbon are carried out in order to design the drying system. Numerical results indicate the air temperature, the air velocity, the air pressure and the timewise temperature variation of ribbon during drying process. In case of the drier process length is short, 400mm, the photovoltaic ribbon is wet. Thus, another study of drying system is necessary to improve the drying ability. As a result, multi-stage drier system is proposed and shown to be good drying ability.

COG(chip on glass) 구조에서 유리를 투과하는 레이저 조사 방식에 의한 area array type 패키지의 마운팅 공정

  • 이종현;김원용;이용호;김영석
    • 한국마이크로전자및패키징학회:학술대회논문집
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    • 한국마이크로전자및패키징학회 2001년도 The IMAPS-Korea Workshop 2001 Emerging Technology on packaging
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    • pp.119-126
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    • 2001
  • Chip-on-glass(COG) mounting of area array electronic packages was attempted by heating the rear surface of a contact pad film deposited on a glass substrate. The pads consisted of an adhesion(i.e. Cr or Ti) and a top coating layer(i.e. Ni or Cu) was heated by an UV laser beam transmitted through the glass substrate. The laser energy absorbed on the pad raised the temperature of a solder ball which is in physical contact with the pad, forming a reflowed solder bump. The effects of the adhesion and top coating layer on the laser reflow soldering were studied by measuring temperature profile of the ball during the laser heating process. The results were discussed based on the measurement of reflectivity of the adhesion layer. In addition, the microstructures of solder bumps and their mechanical properties were examined.

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박판 몰드를 이용한 솔더 범프 패턴의 형성 공정 (Fabrication of Solder Bump Pattern Using Thin Mold)

  • 남동진;이재학;유중돈
    • Journal of Welding and Joining
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    • 제25권2호
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    • pp.76-81
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    • 2007
  • Solder bumps have been used to interconnect the chip and substrate, and the size of the solder bump decreases below $100{\mu}m$ to accommodate higher packaging density. In order to fabricate solder bumps, a mold to chip transfer process is suggested in this work. Since the thin stainless steel mold is not wet by the solder, the molten solder is forced to fill the mold cavities with ultrasonic vibration. The solders within the mold cavities are transferred to the Cu pads on the polyimide film through reflow soldering.

Development of High-Temperature Solders: Contribution of Transmission Electron Microscopy

  • Bae, Jee-Hwan;Shin, Keesam;Lee, Joon-Hwan;Kim, Mi-Yang;Yang, Cheol-Woong
    • Applied Microscopy
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    • 제45권2호
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    • pp.89-94
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    • 2015
  • This article briefly reviews the results of recently reported research on high-temperature Pb-free solder alloys and the research trend for characterization of the interfacial reaction layer. To improve the product reliability of high-temperature Pb-free solder alloys, thorough research is necessary not only to enhance the alloy properties but also to characterize and understand the interfacial reaction occurring during and after the bonding process. Transmission electron microscopy analysis is expected to play an important role in the development of high-temperature solders by providing accurate and reliable data with a high spatial resolution and facilitating understanding of the interfacial reaction at the solder joint.

플라스틱 IC 패키지의 습열 파괴 해석 (Hygrothermal Cracking Analysis of Plastic IC Package)

  • 이강용;양지혁
    • 한국정밀공학회지
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    • 제15권1호
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    • pp.51-59
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    • 1998
  • The purposes of the paper are to consider the failure phenomenon based on delamination and crack when the encapsulant of plastic IC package under hygrothermal loading in the IR soldering process is on elastic and viscoelastic behavior due to the temperature and to show the optimum design using fracture mechanics. The model for analysis is the plastic SOJ package with a dimpled diepad. The package model with the perfect delamination between chip and diepad is chosen to estimate the resistance to fracture by calculating J-integrals in low temperature and C(t)-integrals in high temperature with the change of the design under hygrothermal loading. The optimum design to depress the delamination and crack in the plastic IC package is presented.

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Eutectic Au-20Sn solder와 Cu/ENIG 기판과의 계면반응 (Interfacial Reactions Between Au-20Sn Solder and Cu Substrate with or without ENIG plating layer)

  • 전현석;윤정원;정승부
    • 대한용접접합학회:학술대회논문집
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    • 대한용접접합학회 2006년도 춘계 학술대회 개요집
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    • pp.230-232
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    • 2006
  • Eutectic Au-20Sn solder has been widely used for optoelectronic packages because of fluxless soldering process and thus are particularly valuable for many applications such as biomedical, photonic, and MEMS devices that can not use any flux. Also when good joint strength, superior resistance to corrosion, whisker-free, and good thermal conductivity are demanded, eutectic Au-20Sn solder can be satisfied with above-mentions best. In this study, we tried to know the interfacial reactions between Au-20Sn solder and Cu substrate with or without ENIG plating layer In the results, Au-Cu-Sn ternary phases were formed at the Au-20Sn/Cu substrate, and Au-Ni-Sn, Au-Ni-Cu-Sn phases were formed at the Au-20Sn/ENIG substrate.

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Effects of Nano-sized Diamond on Wettability and Interfacial Reaction for Immersion Sn Plating

  • Yu, A-Mi;Kang, Nam-Hyun;Lee, Kang;Lee, Jong-Hyun
    • 마이크로전자및패키징학회지
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    • 제17권3호
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    • pp.59-63
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    • 2010
  • Immersion Sn plating was produced on Cu foil by distributing nano-sized diamonds (ND). The ND distributed on the coating surface broke the continuity of Sn-oxide layer, therefore leading to penetrate the molten solder through the oxide and retarding the wettability degradation during a reflow process. Furthermore, the ND in the Sn coating played a role of diffusion barrier for Sn atoms and decreased the growth rate of intermetallic compound ($Cu_6Sn_5$) layer during the solid-state aging. The study confirmed the importance of ND to improve the wettability and reliability of the Sn plating. Complete dispersion of the ND within the immersion Sn plating needs to be further developed for the electronic packaging applications.

초경량 금속구조재의 제작을 위한 새로운 방안 (A New Way to Manufacture Ultra Light Metal Structures)

  • 강기주;전계포;나성준;주보성;홍남호
    • 대한기계학회논문집A
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    • 제28권3호
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    • pp.296-303
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    • 2004
  • Recently, the ultra light metal structure with periodic and three dimensional truss elements takes attention because of its multi-functionality and substantial heat resistance. However, the complicated fabrication process leading to high cost has been a major obstacle to wide applications. In this paper, a new idea to construct an ultra light structure with periodic, three dimensional truss using metal wires is presented. To prove the practical validity, a Kagome-like structure was fabricated from stamped wires and punched face sheets. It was assembled by soldering. Through three-point bending and compression tests, the strength was evaluated and compared with the theory.