Hot Zone For Sapphire Growth

Hot Zone For Sapphire Growth Description

Crystal growth furnace is used to grow sapphire crystal. Sapphire crystal is an important material in LED (light-emitting diode) manufacturing. Crystal growth furnace has a unique hot zone design. When alumina is put in the crucible, crystal growth furnace can melt alumina well and control crystal growth accurately. Molybdenum and tungsten materials are used in the hot zone, components and fixtures of the crystal growth furnace.

Hot zones can be divided into two types. One is all-metal hot zone and the other is mixed hot zone.

All the parts in the all-metal hot zone are made of metal. Hot zones in high temperature furnace, crystal growth furnace and sapphire growth furnace are all-metal hot zones, which are mainly produced using the metals of molybdenum, molybdenum-Lanthanum, TZM, tungsten and tantalum. The most commonly used metal is molybdenum (the ambient temperature range of which is generally 1000-2500 ℃/ 1800-4532 ℉). Tungsten is required if the ambient temperature is higher than 2500℃, and the metal with ordinary heat resistance, such as steel, can be used if the temperature is lower than 1000℃.

Mixed hot zones are the hot zones that not only made of metal materials but also graphite and ceramics. Since materials like graphite are used in the mixed hot zone, it may cause pollution to the heating body during the process of heating and heat preservation. Therefore, all-metal hot zone is the best choice as furnace component.

The hot zone is mainly composed of the body, heat insulation screen, heating element and supports. We produce various types of hot zones including square vertical, square horizontal, circular vertical and circular horizontal. We also provide the components of the hot zones including seed holder, heat shield, heating element, support column, gasket, crucible, fixtures and other support components. These high-temperature materials are characterized by their low coefficient of thermal expansion, high thermal and electrical conductivity, and outstanding strength and stability at temperatures over 2,000℃. Customized furnace components and fixtures for high-temperature furnaces are available at SSC.

Physical Properties of Pure Metal Hot Zone

Hot Zone Applications and Related Industries

● Sintering Furnace

● Vacuum Furnace

● Walking Beam Furnace

● Continuous Furnace

● Hot Isostatic Pressing (HIP)

● Crystal Growth