Effect of the Cooling Time after Combustion Reaction of TiO2 / Al / C System on the Products
고석권 , 민경호 , 김형순 , 원창환 Seok Kwon Ko , Kyoung Ho Min , Hyoung Sun Kim , Chang Whan Won
Abstract
The effect of the processing factors of self-propagating high temperature synthesis(SHS) was studied on the system of TiO₂/Al/C. The effect of the size of green pellet and initial temperature of reactant on the combustion temperature cooling time and grain size were studied. The prepared Al₂O₃-TiC powders under various cooling time were sintered by pressureless-sintering and hot-pressing to compare their properties. The properties of commercial powder and powder synthesized by SHS were compared each properties. The cooling time can change by the preheating and the size of pellet. The cooling time affected largely grain size cf titanium carbide. However, the grain size of alumina was nor affected by cooling time. The cooling time after complete combustion have to maintain during for a long time. The Al₂O₃-TiC composite of powder prepared by SHS had good properties comparable to commercial powder.