| 초록 |
Aluminum alloys containing the variety contents of silicon were investigated to define the effect of silicon on the thermal properties of aluminum alloys. The alloys had been manufactured by gravity cast, they included 0.8, 1.5, 3, 6.5, and 9.5wt% silicon respectively. Thermal analyses were carried out using laser flash analysis, thermal mechanical analysis and differential scanning calorimetry. LFA had measured the thermal diffusivity of alloys on static mode at 530℃. TMA and DSC were analyzed on dynamic mode from 20℃ to 530℃and at a heating rate of 10℃/min. The excessive silicon more than the silicon solubility in the aluminum were observed as an irregular shape and the number of particles was increased as following the silicon content proportionately. Thermal conductivity of these alloys was in inverse proportion to the amount of silicon in the alloys. The reduction ratio of conductivity decreased slowly as increasing the silicon amount in the aluminum alloys. In the result of thermo-mechanical analysis, we found a temperature interval which occurring the rapid reaction, it also appeared on the result of differential scanning calorimetry. The additive elements in aluminum alloys had an effect on the matrix lattice and consequently the thermal properties were changed |
