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허민선,최철진,권대환 한국분말야금학회 2004 한국분말재료학회지 (KPMI) Vol.11 No.1
The Indium Tin Oxide(ITO) nano powders were prepared by spray drying and heat treatment process. The liquid solution dissolved Indium and Tin salts was first spray dried to prepare chemically homogeneous recursor powders at the optimum spray drying conditions. Subsequently, the precursor powders were subjected to eat treatment process. The nano size ITO powders was synthesized from the previous precursor powders and the npuities also were decreased with increasing heat treatment temperature. Furthermore, the lattice parameter of TO nano powders was increased by doping Tin into Indium with increasing heat treatment temperature. The par icle size of the resultant ITO powders was about 20∼50nm and chemical composition was composed of In:Sn =86:10 wt.% at 80$0^{\circ}C$.
개량형 인바합금의 미세조직에 미치는 열처리 및 Ti 첨가 영향
허민선(Min Sun Huh),이정한(Jung Han Lee),이찬규(Chan Gyu Lee),이재현(Jae Hyun Lee) 한국열처리공학회 2000 熱處理工學會誌 Vol.13 No.6
There has been a considerable attention on Invar alloys due to its low thermal expansion property. A low thermal expansion property of Invar alloys, lower than 10^(-6) near the room temperature, is attractive for electric transmission lines and precision machine tools. However, the expansion property of Invar alloys is limited below about 520K, and mechanical properties are relatively low to apply to electric transmission line. In order to improve mechanical properties in this alloy, Ti alloying element was added to the Ni_(38)-Mo₂-Cr₁-Fe invar alloy. The microstructure Ti added alloy showed finer than that of the unalloyed one. It was found that the(Mo, Ti), Mo carbide formed by Ti addition obstacled grain growth by pinning effect and supplyed recrystallization sites during heat-treatment. Optimum heat-treatment conditions with Ti addition were also discussed in the modified Invar alloy.