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Effects of flocculated structure formed by metal powder in poly (ethylene glycol) on thermal conductivity and rheological properties were investigated. The suspension of metal powder shows a remarkable shear thinning and pseudoplastic flow and this tendency becomes pronounced with increasing the concentration of metal powder. Frequency dependences of G' and G" were also investigated, and they showed the characteristic ones of concentrated suspensions having the flocculated structure. The thermal conductivity of metal powder is larger than that of disperse medium, therefore the thermal conductivity of the system increases with increasing the concentration of metal powder. When the metal powder is uniformly dispersed, the thermal conductivity of the system is comparatively high. However, it decreases as the flocculated structure of metal powder is constructed because the path of thermal conduction is broken or shrunk. Key-words : Metal powder, Suspension, Flocculated structure, Thermal conductivity

Rheological Properties and Thermal Conductivity of Suspension of Metal Powder