Technical Parameters：
Uniform Temperature Zone Size: Φ460mm×500mm
Max Temperature：1950℃
Working Temperature：1850℃
Heater Form：Side tungsten sheet heater as main heater, upper and
bottom tungsten rod heater as compensation heater
Charging Method: 5 layers supporting tray, 4 tungsten crucibles arranged on every layer
Working Atmosphere：Hydrogen and Nitrogen
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