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천소영,임영목,김두현,이재호,Chun, So-Young,Rhyim, Young-Mok,Kim, Doo-Hyun,Lee, Jae-Ho 한국마이크로전자및패키징학회 2010 마이크로전자 및 패키징학회지 Vol.17 No.1
다공성 탄소전극기지 위의 무전해 니켈도금에 관한 연구를 하였다. 다공성 탄소전극기지로는 다공도가 20 ${\mu}m$ 이상인 것과 16~20 ${\mu}m$ 인 것을 사용하였다. 소수성인 탄소 표면은 $60^{\circ}C$ 이상의 암모니아 용액에 침적함으로써 그 표면 성질이 친수성으로 변화 되었고, 40분 이상 침적 시 접촉각이 $20^{\circ}$ 이하까지 측정 되었다. 도금욕의 pH가 증가됨에 따라 탄소기지 위에 도금된 니켈 도금층의 인의 석출량은 감소하였으며 니켈 도금층이 결정질 구조를 갖는 현상이 관찰되었다. 도금층의 두께는 pH가 증가함에 따라 증가하였다. 활성화 처리를 위한 $PdCl_2$의 농도에 따른 도금층의 두께 변화는 없었으나, 도금에 필요한 $PdCl_2$의 최소농도는 5 ppm 이상인 것으로 나타났다. Electroless nickel plating on porous carbon substrate was investigated. The pore sizes of carbon substrates were 16-20 ${\mu}m$ and over 20 ${\mu}m$. The carbon surface was changed from hydrophobic to hydrophilic after immersing the substrate in an ammonia solution for 40 min at $60^{\circ}C$. The contact angle of water was decreased from $85^{\circ}$ to less than $20^{\circ}$ after ammonia pretreatment. The content of phosphorous in nickel deposit was decreased with increasing pH and then deposits became crystallized. The thickness of nickel deposit was increased with increasing pH. The minimum concentration of $PdCl_2$ for the electroless nickel plating was 5 ppm and the thickness of nickel was not significantly affected by the concentration of $PdCl_2$.
금속 미세조직의 3차원 이미지 관찰을 위한 순차적 박리 및 재구성 기술
김수현 ( Su-hyeon Kim ),임영목 ( Young Mok Rhyim ) 대한금속재료학회(구 대한금속학회) 2016 대한금속·재료학회지 Vol.54 No.9
Experimental techniques for serial sectioning and reconstruction were investigated in the three-dimensional imaging of microstructures in metallic materials. Mechanical polishing equipped with a light optical microscope and a digital image processor was used for the serial sectioning and reconstruction. Different processing conditions were investigated for three different alloys: Al-Si alloy, Al-SiC composite, and AZ31 magnesium alloy. Proper selection of polishing cloths and polishing abrasives was pre-requisite for obtaining good slice images. The thicknesses of the slices were precisely controlled for each alloy by changing the mechanical polishing and chemical etching conditions. Two-step polishing was a very effective method for serial sectioning of multi-phase alloys with a soft matrix and hard particles such as Al-SiC composites. Image filtering with a delineate and median filter was very useful for successful image segmentation of multi-phase alloys.(Received October 8, 2015; Accepted January 23, 2016)
In-Situ-Template-Interface Reaction (ISTIR)법에 의한 CdSe 중공 입자의 형성
최문희,이윤복,김형국,임영목,김진천,김영석,김양도,Choi Moon-Hee,Lee Yoon-Bok,Kim Hyong-Kuk,Rhyim Young-Mok,Kim Jin-Chun,Kim Young-Seok,Kim Yang-Do 한국분말야금학회 2005 한국분말재료학회지 (KPMI) Vol.12 No.4
CdSe hollow sphere with average size of about 30-50 nm was synthesized from the mixed solution of cadmium chloride $(CdCl_2)$, sodium selenosulfate $(Na_2SeSO_3)$ and ethylenediamine(EDA, $H_2NCH_2CH_2NH_2$) at room temperature. The molar ratio of EDA to $Cd^{2+}$ showed the most significant effect on the morphology of CdSe hollow sphere. This paper will present and discuss the possible formation mechanism of CdSe hollow sphere based on the observation of morphological changes.
고융점 금속의 미소형상 정밀주조를 위한 탄소몰드의 적용성에 관한 연구
지창욱,이은주,김양도,임영목,Ji, Chang-Wook,Yi, Eun-Ju,Kim, Yang-Do,Rhyim, Young-Mok 한국분말야금학회 2011 한국분말재료학회지 (KPMI) Vol.18 No.2
Carbon material shows relatively high strength at high temperature in vacuum atmosphere and can be easily removed as CO or $CO_2$ gas in oxidation atmosphere. Using these characteristics, we have investigated the applicability of carbon mold for precision casting of high melting point metal such as nickel. Disc shape carbon mold with cylindrical pores was prepared and Ni-base super alloy (CM247LC) was used as casting material. The effects of electroless Nickel plating on wettability and cast parameters such as temperature and pressure on castability were investigated. Furthermore, the proper condition for removal of carbon mold by evaporation in oxidation atmosphere was also examined. The SEM observation of the interface between carbon mold and casting materials (CM247LC), which was infiltrated at temperature up to $1600^{\circ}C$, revealed that there was no particular product at the interface. Carbon mold was effectively eliminated by exposure in oxygen rich atmosphere at $705^{\circ}C$ for 3 hours and oxidation of casting materials was restrained during raising and lowering the temperature by using inert gas. It means that the carbon can be applicable to precision casting as mold material.
DEA 용액에서 암모니아를 함유한 염화니켈 수용액으로부터 니켈 분말의 입경 제어
최은영,이윤복,윤석영,김광호,김진천,임영목,김형국,김양도,Choi Eun Young,Lee Yoon Bok,Yoon Suk Young,Kim Kwang Ho,Kim Jin Chun,Rhyim Young Mok,Kim Hyong Kuk,Kim Yang Do 한국분말야금학회 2005 한국분말재료학회지 (KPMI) Vol.12 No.3
Nickel powders were synthesized by the hydrazine reduction of nickel chloride solution containing ammonia in DEA solutions. The size distribution of nickel powders were investigated as a function of ammonia concentration, hydrazine concentration and the mixed composition ratio of diethanolammine (DEA) and triethanolammine (TEA). Nickel powders with the size in submicron range were obtained at $185^{\circ}C$ for 45 minutes by hydrazine reduction of nickel chloride solution in DEA solutions. The hydrazine concentrations showed significant effects on the particle size and shape distribution of nickel powders under $NH_3/Ni^{2+}$ molar ratio of 2.0 condition. As the mixed volume ratio of TEA and DEA increased, nickel powders with relatively larger particle size and low agglomeration were obtained. Nickel powders with particle size in the ranged from 0.4 to $0.9\;{\mu}m$ were obtained at the 50 $vol.%$ of TEA.
비수용성 매질로부터 Ni(OH)<sub>2</sub> 반응슬러리의 환원반응에 의한 니켈 분말의 제조
최은영,이윤복,윤석영,김광호,김진천,임영목,김형국,김양도,Choi Eun Young,Lee Yoon Bok,Yoon Suk Young,Kim Kwang Ho,Kim Jin Chun,Rhyim Young Mok,Kim Hyong Kuk,Kim Yang Do 한국재료학회 2005 한국재료학회지 Vol.15 No.5
Nickel Powders were synthesized by the reduction of $Ni(OH)_2$ reactant slurries from nonaqueous media, and the morphological characteristics of nickel powders with the addition of NaOH, the composition of mixed solvents, reaction temperature and reaction time were investigated. The NaOH addition changed the structure of agglomeration in the submicron range. As the volume ratio of TEA to DEA increased, the powders slightly suppressed the agglomeration between particles and their size increased. The reaction temperature on size and shape of nickel powders was significant. As reaction time was shortened from 40 min to 0.3 min at $220^{\circ}C$, size distribution of nickel powders was transferred to a narrow size distribution owing to the presence of smaller particles with below $1.0\;{\mu}m$.
DEA 용액으로부터 히드라진의 환원 반응에 의한 니켈 분말 제조
최은영,이윤복,윤석영,김광호,김진천,임영목,김형국,김양도,Choi, Eun-Young,Lee, Yoon-Bok,Yoon, Suk-Young,Kim, Kwang-Ho,Kim, Sin-Chun,Rhyim, Yaung-Mok,Kim, Hyong-Kuk,Kim, Ynng-Do 한국세라믹학회 2005 한국세라믹학회지 Vol.42 No.6
Nickel powders synthesized by the reduction of hydrazine of nickel salts fiom diethanolamine(DEA) solution, and investigated the morphological characteristics of nickel powders with the addition of hydrazine, reaction temperature, the composition of mixed solvents. The addition of hydrazine in DEA solution largely affected on size control of nickel powders. Under $N_2H_4/Ni^{2+}$ molar ratio= 1.5 and 2.0 conditions, spherical nickel powders in the submicron range obtained, owing to higher the reduction rate. An increase of temperature increased the size of nickel particles. At $220^{\circ}C$ for 40 min, the nickel powders composed of polyhedral particles with high crystalline in the submicron range. The mixed volume ratio of TEA to DEA affected on the increase of particle size and the inhibition of agglomerate between particles.