• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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• 2007.06a
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• pp.148-149
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• 2007

현재 전자부품 시장은 RoHS 규정으로 인하여 lead free화가 진행되고 있으며 많은 주목을 받고 있다. 본 논문에서는 반도체 패키지 및 부품표면일장에서 사용 되는 무전해 주석 도금과정 중 산 탈지 후 막의 표면 거칠기 정도가 도금 후의 표면 거칠기 정도에 미치는 영향을 평가 한다. 실험의 효율성을 높이기 위해 통계적인 실험계획법을 사용하였으며 실험의 횟수를 줄이고 표면 거칠기 정도는 이미지 프로세싱을 통하여 분석하였으며 통계적인 모델링을 통해 micro etch가 도금 표면의 거칠기에 주는 영향을 분석하였다.

• Proceedings of the Korean Society for Technology of Plasticity Conference
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• 2006.05a
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• pp.188-190
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• 2006

본 연구에서는 Anodic Aluminum Oxide(AAO) 템플레이트를 이용하여 전기도금법으로 일정한 길이와 고밀도 대면적의 Nickel nanorod를 제작하였다. 전기도금법으로 AAO-템플레이트내를 채우는 방법으로 제작되었다. 그 결과 직경 $80{\sim}100$ nm, 길이 $0.5{\mu}m$ 가량의 균일한 nanorod를 직경 40mm, 두께 $0.8{\mu}m$의 대면적 원형 AAO-템플레이트에 가득 채우는데 성공 하였으며 AAO 템플레이트는 제거되어 기판 위에 free-standing 되는 구조로 제작 되었다

• Journal of the Microelectronics and Packaging Society
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• v.15 no.4
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• pp.71-76
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• 2008

The mechanical properties of Ni-Fe alloy were varied with the current type, current density and bath conditions such as concentrations and temperature. The effect of electroplating parameters on the surface hardness, mechanical strength, residual stress and wear properties were investigated. The mechanical properties of electrodeposits with PC plating is superior to those with DC plating. Ni-Fe electrodeposits with PC has approximately 50% lower residual stress than that of DC plating. The tensile strength of PC electroplated specimen was 15% higher than that of DC electroplated specimen. The wear resistance of PC specimen was 30% improved relative to that of DC specimen.

• Proceedings of the Korean Magnestics Society Conference
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• 2004.12a
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• pp.77-77
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• 2004

• Proceedings of the Korean Institute of Surface Engineering Conference
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• 1999.10a
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• pp.88-89
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• 1999

• Proceedings of the Korean Magnestics Society Conference
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• 2000.05a
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• pp.46-47
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• 2000

• Proceedings of the Korean Magnestics Society Conference
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• 2011.12a
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• pp.162-163
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• 2011

• Resources Recycling
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• v.22 no.3
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• pp.91-99
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• 2013

Steel industry which has been accomplishes the base of our country economy, automobile and electronic industry are taking charge of the role, whose electroplating is important. Large amount of wastewater and various metal salts, including hazardous materials was generated from the electroplating pre-treatment, plating, washing and post-plating. Currently, the general wastewater follows in the environmental law and neutralization after controlling, sludge where the various metal is mixed reclaims below multiple regulative and trust it is controlling. The sludge which includes the gas price metal reclaims in the field and trust it controls. a reclamation price of land it is insufficient but and the control expense holds plentifully and it loses the gas price metal which is valuable. Consequently, The research regarding to recover a gas price metal actively from this waste water, it is advanced. A new method to recover valuable metals from electroplating wastewater synthesis of metal sulfides using topical methods utilizing iron oxidizing bacteria, reagent of sulfides and solvent extraction using an organic solvent, such as the development of the law to recover these metals and metal sulfides of wastewater using selective recovery have been studied. By using these wastewater treatment method under frequency above 95%, it has been obtained the valuable metal from the wastewater, where the metal ion of Fe, Cu, Zn and Ni complexes was mixed. As we discuss the wastewater, which has been discharged from electroplating process, it is important and will be applied to the resources of metal in the urban mine.

• Journal of the Microelectronics and Packaging Society
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• v.17 no.4
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• pp.83-88
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• 2010

The composite electroplating is accomplished by adding inert materials during the electroplating. Permalloy is the term for Ni-Fe alloy and it is used for industrial applications due to its high magnetic permeability. Microhardness for microdevices is enhanced after composite coating and it increases the life cycle. However, the hydroxyl group on the silica makes their surface susceptible to moisture and it causes the silica nanoparticles to be agglomerated in the aqueous solution. The agglomeration problem causes poor dispersion which eventually interrupts uniform deposition of silica nanoparticles. In this study, the dispersion of silica nanoparticles in the permalloy electroplated layer is reported with variation of additives and sonication time. Longer sonication period guaranteed better silica nanopowder dispersion and sonication period also influenced on composition of deposits. The amount of silica nanopowder codeposition and surface morphologies were influenced with variation of additives. In alkaline bath, smooth surface morphology and relatively high contents of silica nanopowder codeposition were obtained with addition of sodium lauryl sulfate.

• Journal of the Microelectronics and Packaging Society
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• v.19 no.4
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• pp.65-69
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• 2012

Composite coating can be manufactured during the electroplating with the bath containing a suspension of particles: ceramic, polymer, nanopowders. Improvement of hardness, wear resistance, corrosion resistance and lubrication properties are well-known advantage of composite coating. In this study, nano $TiO_2$ powder dispersed Ni composite plating was investigated. The improvement of surface hardness and photo decomposition effects can be expected in this coating. Zeta potential was measured with pH. The effect of ultrasonication time and types of ultrasonicator were studied to minimize the agglomeration of $TiO_2$ nanopowders in the electrolyte. Optimum conditions for nano $TiO_2$ dispersed Ni composite coating were $40mA/cm^2$ of current density, pH 3.5, and $50^{\circ}C$. At these conditions, $TiO_2$ nanoparticles contents in the Ni deposit was 15-20 at.%.