... , tungsten crucible is widely applied in industry furnace such as sapphire growth furnace, quartz glass melting furnace, and reare earth smelting ... working environment of tungsten crucible is above 2000°C. For sapphire crystal growth furnace, high-purity, high-density, no internal- ... of pulling crystal, metamictization pot-committed and service life during sapphire growth process. tungsten crucible