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The present study investigated experimentally the effects of temperature and pressure upon effective thermal conductivity of packed bed of magnesium alloy particles. The test particles made of AM50A or AZ91D were poured into a cylindrical vessel and were applied a given superficial pressure for six hours under a constant temperature condition. The superficial pressure was changed between 2.5 MPa and 10 MPa, and the temperature was varied from 95.5°C to 457°C. After removing the packed bed of magnesium alloy particles from the cylindrical vessel, the measurement of effective thermal conductivity was carried out under the steady state comparison method. The effective thermal conductivity increased with an increasing in the pressure, temperature and the thermal conductivity of the particle. At a given material of particle, the effective thermal conductivity was mainly dominated by the relative density and was increased with an increasing in the relative density. The dependency of the effective thermal conductivity upon the relative dencity was remarkable in the low relative dencity region and the high relative dencity region.

Fundamental Study on Injection Molding of Magnesium Alloy (2nd Report, Effective Thermal Conductivity of Packed Bed of Magnesium Alloy Particles)