http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
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, 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>