• Journal of the Korean Chemical Society
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• v.29 no.3
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• pp.319-327
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• 1985

The effect of titanate coupling agents on the electrical and mechanical properties of conductive poly (vinyl chloride)-nickel composite was studied as functions of filler concentration, the variation of the amount of titanate coupling agents and the type of titanate coupling agents. It was found that the electrical and mechanical properties of PVC-Ni system were improved by the treatment of titanate coupling agents, but the excessive use of titanate coupling agents influenced to give worse properties.

• Korean Journal of Materials Research
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• v.30 no.11
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• pp.636-640
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• 2020

Due to the serious air pollution problem, interest in eco-friendly vehicles is increasing. Solving the problem of pollution will necessitate the securing of high energy storage technology for batteries, the driving force of eco-friendly vehicles. The reason for the continuing interest in the transition metal oxide LiMO₂ as a cathode material with a layered structure is that lithium ions reveal high mobility in two-dimensional space. Therefore, it is important to investigate the effective intercalation and deintercalation pathways of Li⁺, which affect battery capacity, to understand the internal structure of the cathode particle and its effect on the electrochemical performance. In this study, for the cathode material, high nickel Ni_0.8Co_0.1Mn_0.1(OH)₂ precursor is synthesized by controlling the ammonia concentration. Thereafter, the shape of the primary particles of the precursor is investigated through SEM analysis; X-ray diffraction analysis is also performed. The electrochemical properties of LiNi_0.8Co_0.1Mn_0.1O₂ are evaluated after heat treatment.

• 한국태양에너지학회:학술대회논문집
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• 2009.11a
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• pp.350-355
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• 2009

The crysralline silicon solar cell where the solar cell market grows rapidly is occupying of about 85% or more high efficiency and low cost endeavors many crystalline solar cells. The fabricaion process of high efficiency crystalline silicon solar cells necessitate complicated fabrication processes and Ti/Pd/AG contact, This metal contacts have only been used in limited areas in spite of their good srability and low contact resistance because of expensive materials and process. Commercial solar cells with screen-printed solar cells formed by using Ag paste suffer from loe fill factor and high contact resistance and low aspect ratio. Ni and Cu metal contacts have been formed by using electroless plating and light-induced electro plating techniques to replace the Ti/Pd/Ag and screen-printed Ag contacts. Copper and Silver can be plated by electro & light-induced plating method. Light-induced plating makes use the photovoltaic effect of solar cell to deposit the metal on the front contact. The cell is immersed into the electrolytic plating bath and irradiated at the front side by light source, which leads to a current density in the front side grid. Electroless plated Ni/ Electro&light-induced plated Cu/ Light-induced plated Ag contact solar cells result in an energy conversion efficiency of 16.446 % on 0.2~0.6${\Omega}$ cm, $20{\times}20mm^2$, CZ(Czochralski) wafer.

• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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• 2007.11a
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• pp.83-84
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• 2007

Sn-filled and Ni-doped $CoSb_3$ skutterudites were prepared by encapsulated induction melting, and their filling and doping effects on thermoelectric properties were investigated. Single phase ${\delta}-CoSb_3$ was successfully obtained by encapsulated induction melting and subsequent heat treatment at 823K for 5 days. Nickel atoms acted as electron donors by substituting cobalt atoms. Thermoelectric properties were remarkably improved by Sn filling and Ni doping.

• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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• 2006.06a
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• pp.24-25
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• 2006

In this study, Ni silicide on the SOI substrate doped B11 is proposed to improve thermal stability. The sheet resistance of Ni-silicide utilizing pure SOI substrate increased after the post-silicidation annealing at $600^{\circ}C$ for 30 min. However, using the proposed B11 implanted substrate, the sheet resistance showed stable characteristics after the post-silicidation annealing up to $700^{\circ}C$ for 30 min.

• Korean Journal of Materials Research
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• v.15 no.7
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• pp.486-490
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• 2005

Thin films of tungsten oxide and nickel oxide were deposited on $Al_2O_3/Si-substrate$ by high vacuum thermal evaporation. The properties of microstructure and crystallinity were analyzed by SEM and XRD respectively. $WO_3$ films without addition of NiO showed polycrystalline structure after annealing at $500^{\circ}C$ for SO min. There were the cracks between the polycrystalline grains and the crack width was increased with the thickness of $WO_3$ films. The cracks in the $WO_3$ films could be controlled by an optimum deposition of NiO on $WO_3$ films and either less or more than the optimum addition fails to suppress the cracks. A process mechanism to suppress the crack has been discussed.

• Korean Journal of Materials Research
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• v.4 no.8
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• pp.877-887
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• 1994

Cu-Ni-Si-P alloys have been studied in order to develop connector material which has a favorable combination of strength, electrical conductivity, elastic limit, thermal softening resistence and bend formability. Three kinds of trial alloys with various nickel and silicon content were melted and cast, hot rolled at about $900^{\circ}C$ and cold rolled. Mechanical properties and electrical conductivities of these alloys annealed at $450^{\circ}C$, $500^{\circ}C$ and $550^{\circ}C$ were investigated. An alloy with the composition of Cu-2.7%Ni-0.53%Si-O.O29%P, which shows a favorable combination of high strength and high electrical conductivity, has been developed. Various characteristics of the alloy 1 connector material were evaluated and compared with phospher bronze(C521OR-H) and brass(C26OOR-EH) connector material.

• Journal of Powder Materials
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• v.15 no.3
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• pp.239-243
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• 2008

Ni-W(1-5 at.%) alloy rods were made by powder metallurgy process including powder mixing, compacting and subsequent sintering. Ni and W powder of appropriate compositions were mixed by a ball milling and isostatically pressed in a rubber mold into a rod. The compacted rods were sintered at $1000^{\circ}C-1150^{\circ}C$ at a reduced atmosphere for densification. The lattice parameters of Ni-W alloys were estimated by a high resolution neutron powder diffractometer. All sintered rods were found to have a face centered cubic structure without any impurity phase, but the diffraction peak locations were linearly shifted with increasing W content. The lattice parameter of a pure Ni rod was $3.5238{\AA}$ which is consistent with the value reported in JCPDS data. The lattice parameter of N-W alloy rods increased by $0.004{\AA}$ for 1 atomic % of W, which indicates the formation of a Ni-W solid solution due to the substitution of nickel atoms by tungsten atoms of larger size.

• Journal of Powder Materials
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• v.9 no.6
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• pp.455-462
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• 2002

The microstructures and properties of TiC dispersed nickel-base alloy were studied in this work. The alloy prepared by powder metallurgical processing was solution treated, 1st-aged at $880^{\circ}C$ for 16 hours, and then 2nd-aged at $760^{\circ}C$ for 4 hours. Microstucture of sintered specimen showed that TiC particles are uniformly dispersed in Ni base alloy. In the specimen aged at $880^{\circ}C$ for 8 hours, the fine $\gammaNi_3$(Al,Ti) precipitates with round shape are observed and the very fine $\gammaNi_3$(Al,Ti) particles with round shape are precipitated in the specimen aged at $760^{\circ}C$ for 4 hours. The presence of ${\gamma}$precipitates in TiC/Ni base alloy increased the hardness and wear resistance of the specimen. The hardness and wear resistance of the Ni-base with TiC are higher than those of conventional Ni-base superalloy X-750 because of dispersion strengthening of TiC particles. The hardness, transverse rupture strength and resistance of the specimen 2nd-aged at $760^{\circ}C$ for 4 hours are higher than those of 1st-aged specimen due to ultrafine $\gammaNi_3$(Al,Ti) precipitates.

• Journal of Hydrogen and New Energy
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• v.19 no.6
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• pp.520-528
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• 2008

2-step methane reforming, consisting of syn-gas production and water splitting step, was carried out over Cu-ferrite/$ZrO_2$. To improve the reactivity over Cu-ferrite/$ZrO_2$ presenting low reactivity in 2-step methane reforming, the addition of Ni was considered. As the results, the added Ni to Cu-ferrite/$ZrO_2$ improved the reactivity in syn-gas production step. However, (Cu, Ni) ferrite/$ZrO_2$ showed carbon deposition in syn-gas production step when an excess Ni was added. Furthermore, (Cu, Ni) ferrite/$ZrO_2$ showed the high durability without the deactivation of the medium during repeated ten cycles, although it showed more deposited carbon than the medium without Ni.