Tungsten wire heating element: Tungsten wire is an important component as a heating element in the sapphire growth furnace. More commonly the tungsten wire heating element is the strip type tungsten wire heating element and the mesh type tungsten wire heating element. The producing process of tungsten wire heating element is more complicated than that of tungsten sheet heating element. The surface heat load is very small, the surface heat effect is good, the heat distribution is stable and uniform, the temperature is uniform in the furnace. The resistance value of tungsten wire mesh is easier to control when design it, according to the needs of the production process, it can be made into single-phase or three-phase star and triangle type. The current voltage is easy to control in a reasonable range to save cost and improve the production efficiency. When adjust the equipment, it is not prone to danger, the shape of the location is very convenient to adjust. Tungsten wire heating element has a very high production efficiency in production, in recent years, many domestic industry graphite hair heater and tungsten sheet heating element are gradually being replaced by a tungsten wire heating element.

Tungsten sheet heating element: Compared with the tungsten wire heating element, it is easy to be processed, the surface heat load is larger, the resistance value is not easy to adjust, the voltage and current is not easy to control in a reasonable range. Assembly, installation, adjustment is more prone to damage, crack, the position shape is not easy to control. The service life is short, and the production is easy to damage, and the resistance value of the whole body can be changed greatly when the heating element of the tungsten sheet disappear the crack used in the process. After the restoration of the tungsten sheet heating element, it will produce great stress in the repair point, the service life is short, which can not guarantee the normal safety of production.