Numerical Simulation of Temperature Field during Vacuum Sublimation Purification of Metal Tm

Abstract:

The thermo physical parameters of Tm vapor and the range of sublimation temperature have been determined by vapor pressure of metal Tm, and a 2-D axis-symmetric heat transfer model has been developed to investigate the temperature distribution in sublimation furnace. The simulation results show that, due to the heat loss at crucible bottom, the temperature of crucible, solid metal and Tm vapor increases with crucible height increasing, reaches the maximum value in the middle of crucible in height direction, and then decreases rapidly, and the maximum temperature is closer to the heating body temperature with its increasing; at the outside surface of condenser, the temperature decreases sharply, and the temperature curves with various heating body temperature are almost overlapped, the condensing region of Tm vapor is not affected by the heating body temperature; the temperature of upper surface of solid Tm is about 30°C lower than that of heating body, and the absolute and relatively temperature differences decrease correspondingly with increasing of heating body temperature.

• Periodical: Materials Science Forum (Volume 762)
• Pages: 313-318
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.762.313
• Online since: July 2013
• Authors: Xiao Wei Zhang, Rui Ying Miao, Zhi Qiang Wang, Zong An Li
• Keywords: Numerical Simulation, Temperature Field, Tm Vapor, Vacuum Sublimation

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