Effect of Grain Size upon the Thermal Behavior of Copper and Diamond Powders using Differential Scanning Calorimetry (DSC)

摘要

Objectives: In this study, the heat capacity and heat flow of varied grain size of copper and diamond powders were investigated. Methods: Heat capacity and heat flow of varied grain size of copper (1 μm-70 μm) and diamond powders (2 μm-300 μm) were measured using differential scanning calorimetry (DSC). The thermal properties of copper and diamond powders were determined in a temperature range of 0-500oC, with a heating rate of 5k/min in a nitrogen environment. Findings: Heat capacity and heat flow of copper and diamond powders increases with grain size and it is consistent with earlier researchers. Heat capacity of copper and diamond powders also increases with grain size. The heat capacity and heat flow was 1.4 J/gk and 0.24 mW/mg respectively for 60-70μm grain size of copper powder, whereas the values of the same were found to be 0.9 J/gk and 0.4 mW/mg for diamond powder of grain size in the range of 270 to 300 μm is determined. This study reveals that the diamond powders show better thermal performance over copper powder. Application/Improvements: Determination of thermal behavior is critical in determining the amount of heat transferred in micro electronics and solar thermal based applications.