Investigation of a High Temperature Electrical Conductivity Device for Use with Thermal Image Heating

摘要

The 'double-clamshell' imaging system has been successfully used to measure electrical conductivity of single crystal and polycrystalline aluminum oxide and pyrolytic boron nitride in the absence of impressed electric and magnetic fields. A furnace with a controlled atmosphere was designed and constructed for the conductivity measurements up to a temperature greater than 2130K. Two-5000 watt xenon arc lamps were used for energy sources. At 1500K a temperature gradient of 6 deg K along the empty furnace axis was measured with alumina-shielded thermo-coupcouples. The thermal conductivity of a sample reduced the gradient to less than 1 deg K. (Author)