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허무영,석윤종 대한금속재료학회(대한금속학회) 1990 대한금속·재료학회지 Vol.28 No.7
The preferred orientations and microstructures of the cold rolled 0.004%C and 0.022%C steel were studied. The crystallographic deformation theory was applied to analyse the results of the x -ray measurements and TEM observations. It was found that the rolling texture of the steels could be described by a {111}//ND fiber and a $lt;110$gt;//ND fiber. The equiaxed cells developed by homogeneous slip might be a major deformation mechanism of the steels at low rolling reductions. At medium to high rolling reductions, however, the major deformation mechanism was changed to the formation of the microbands, which was developed by a localized inhomogeneous slip. As further increasing reduction, the deformation mechanism was changed consecutively as clustering of microbands, decreasing microband thickness, a rotation of microbands to the rolling direction and a development of shear bands in the hard grains.
Effect of Convection Gas on the Synthesis of Nanophase Tin Oxides During a Gas Condensation Method
Huh, Moo Young,AHN, Jae Pyoung,Park, Jong Ku,KIM, Byoung Kee 대한금속재료학회(대한금속학회) 1997 METALS AND MATERIALS International Vol.3 No.3
Tin oxide powders of nanometer size have been synthesized by a gas condensation method using helium or a mixture of oxygen and helium as the convection gas. Changes in the average size, morphology, and crystal phases were investigated during heat treatment at temperatures between 350℃ and 720℃ in the air. Spherical tin oxide powders of 15 nm in average diameter were synthesized in a helium atmosphere, which was composed of Sn, SnO₂, and Sn₂O₃, phases. After annealing at 720℃, these multiphase particles transformed to a single SnO₂ phase and became an irregular shape of about 50 nm in diameter. This rapid coarsening was attributed to fast mass transfer among particles. The spherical SnO₂ powder of 7 nm in average diameter was directly synthesized using a gas mixture of oxygen and helium. Upon annealing up to 720℃, morphological changes were barely observed in the powder synthesized using a convection atmosphere containing oxygen.
Huh, Geun,Kwon, Ki-Ok,Cha, Sang-Ho,Yoon, Sang-Woong,Lee, Moo Young,Lee, Jong-Chan Wiley Subscription Services, Inc., A Wiley Company 2009 Journal of applied polymer science Vol.114 No.4
<P>Bis(2-(oxiran-2-ylmethyl)-1,3-dioxoisoindolin-5-yl) carbonate and polymers containing 9-anthracenylmethylmethacrylate (AMMA), p-tert-butoxy styrene (PTBS), and methacrylic acid (MAA) monomeric units were synthesized with the aim of developing a novel photo-patternable cross-linked epoxy system. The oxirane groups in bis(2-(oxiran-2-ylmethyl)-1,3-dioxoisoindolin-5-yl) carbonate were reacted with the carboxylic acid in the polymer to generate a cross-linked epoxy film, and the photo degradation of the cross-linked film was achieved through decomposition of the carbonate groups in the cross-linked film by deep UV irradiation. Because the copolymer containing anthracene groups has relatively high reflective index and absorption at 248 nm, this cross-linked system can be applied to patternable bottom antireflective coating materials for deep UV lithography applications. © 2009 Wiley Periodicals, Inc. J Appl Polym Sci, 2009</P>
Huh, Moo Young,Lee, J.P.,Lee, Jae Chul,Park, Jong Woo,Chung, Young Hoon Trans Tech Publications, Ltd. 2005 Materials science forum Vol.475 No.-
<P>The evolution of annealing textures and microstructures in the aluminum alloy 3103, which was subjected to deformation by either cold rolling or equal channel angular rolling (ECAR), was investigated. Samples of AA 3103 sheets were repeatedly deformed by ECAR up to six passes. In addition, AA 3103 was cold rolled to the same hardness level of the ECARed samples. Upon annealing, the cold rolled sample was recrystallized by the discontinuous recrystallization which gave rise to the formation of the cube texture and large grains bigger than 30 µm. In contrast, the ECARed sample was recrystallized by extended recovery which led to the formation of ultra-fine grains having a size smaller than 3.5 µm.</P>
가스응축법에 의해 제조된 초미분 주석산화물의 크기 및 형상에 미치는 증발속도 및 가스압력의 영향
허무영,박종구,안재평 대한금속재료학회(대한금속학회) 1996 대한금속·재료학회지 Vol.34 No.7
The effects of evaporation rate and pressure of helium gas on the size of ultrafine tin oxide powder were studied in a gas condensation method. The velocity and size of convection current of helium gas were regulated by varying gas pressure in the chamber and temperature of an evaporation source. As the convection current became slow in velocity and reduced in size, the average size of the synthesized tin oxide powder increased. The respective effects of evaporation rate and gas pressure were analyzed by computer simulation of convection currents at a steady state condition, based on the experimental results. Oxygen gas flown into a condensation chamber filled with constant helium gas provided a proper condition for synthesis of ultrafine tin oxide powder having a narrow size distribution.