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Anyang, South Korea

The present invention proposes a method for removing an oxide formed on the surface of a copper film used in the process of manufacturing a circuit for a semiconductor, an organic light-emitting diode, an LED, or a liquid crystal display without causing corrosion on a lower metal film. The composition including corrosive amine may remove a metal oxide depending on the content of additive ranging from 0.01 to 10% regardless of the content of ultrapure water. A polar solvent other than the corrosive amine may efficiently remove an oxide from the surface of the metal when the same contains water and 0.01 to 20% of the additive.

The present invention relates to a photoresist stripping composition for all process of manufacturing LCD, more specifically to a water-borne united photoresist stripping composition, as a weak basic composite comprising a tertiary alkanolamine, water, and an organic solvent. The composition according to the present invention prevents a corrosion of Al and Cu metal wiring in process of manufacturing LCD, has a good capability of removing photoresist, and is applied to all Al process, Cu process, an organic film process, and COA process.

Naqvi S.A.A.,Korea Institute of Energy Research | Naqvi S.A.A.,Korea University | Mehran M.T.,Korea Institute of Energy Research | Mehran M.T.,Korea University | And 11 more authors.
Chemical Engineering Journal | Year: 2016

We investigated the operating characteristics of solid oxide carbon fuel cells (SO-CFCs) integrated with a steam gasifier that used carbonaceous fuels, including activated carbon and biomass driven charcoal. Steam gasification was carried out in a specially designed gasifier, which was directly integrated with a solid-oxide based carbon fuel cell. We studied the effects of gasification temperature, steam flow rate and catalyst addition on the electrochemical performance of SO-CFC, and the results showed that among the three tested fuels, activated carbon with a K2CO3 catalyst performed the best. At 850 °C, maximum power density values of 108 mW/cm2, 161 mW/cm2 and 181 mW/cm2 were achieved when the SO-CFC was operated using activated carbon, biomass driven charcoal and activated carbon with a K2CO3 catalyst, respectively. The SO-CFC operated continuously for 100 h and it showed relatively stable performance. This study suggests that by using a catalytic steam gasifier integrated with the SO-CFC, solid carbon fuel resources can be used for power generation with higher efficiency and minimal carbon footprint. © 2016 Elsevier B.V.

Lee J.G.,Yonsei University | Jeon O.S.,Yonsei University | Ryu K.H.,LTC Co. | Ryu K.H.,Yonsei University | And 5 more authors.
Ceramics International | Year: 2015

Solid oxide fuel cells (SOFCs) have advanced rapidly for the last decades. Since 8 mol% yttria-stabilized zirconia (8YSZ) has been considered the most conventional material for SOFC electrolyte, a number of studies have been focused on improving 8YSZ performance by changing dopants or adding a trace of metal oxide. In this study, the effect of a trace of CuO (100 ppm) on the performance of 8YSZ-based SOFCs is investigated. It is found that addition of a trace of CuO not only promotes a densification of the YSZ electrolyte by acting as a sintering aid but also increases the amount of the oxygen vacancy in the YSZ electrolyte. The ionic conductivities are about 0.0173 S cm-1 and 0.0196 S cm-1 in pristine and CuO (100 ppm)-YSZ electrolyte, respectively. The cell performance is about 0.5103 W cm-2 at 800 °C, which is about 1.5 times higher than the cell based on the pure YSZ electrolyte. The gadolinium-doped ceria (GDC)/8YSZ bilayer cell test also shows similar improvement to the single YSZ cell tests. Thus, the introduction of a trace of Cu (100 ppm) to the 8YSZ can be promising for a solid oxide fuel cell electrolyte. © 2015 Elsevier Ltd. and Techna Group S.r.l. All rights reserved.

Turichin G.,Institute of Laser and Welding Technology | Valdaytseva E.,Institute of Laser and Welding Technology | Tzibulsky I.,Institute of Laser and Welding Technology | Lopota A.,LTC Co. | Velichko O.,LTC Co.
Physics Procedia | Year: 2011

The article devoted to steady state and dynamic simulation of melt pool behavior during hybrid laser-arc welding of pipes and shipbuilding sections. The quasi-stationary process-model was used to determine an appropriate welding mode. The dynamical model of laser welding was used for investigation of keyhole depth and width oscillations. The experiments of pipe steel and stainless steel hybrid laser-MAG welding have been made with 15-kW fiber laser in wide range of welding mode parameters. Comparison of experimentally measured and simulated behavior of penetration depth as well as their oscillation spectra approved the self-oscillation nature of melt pool behavior. The welding mode influence of melt pool stability has also been observed. The technological peculiarities, which allow provide high quality weld seam, has been discussed also. © 2011 Published by Elsevier Ltd.

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