Molybdenum crucible / Tungsten crucible
Every LED is born in a crucible.
In this crucible, aluminum oxide (Al2O3) is melted and structured into a monocrystalline sapphire crystal. Depending on the method used, this process takes between two and three weeks. The art of growing single crystals: The material is first heated to over 2,000 degrees Celsius and is then allowed to cool slowly in a controlled environment. Only a few materials can be used to produce these crucibles.
This is because they must meet two requirements:
on the one hand, they must be resistant to the high temperatures involved and, on the other, they must not contaminate the melted sapphire. KAMC’s high-performance materials(W&Mo) are able to meet precisely these requirements.
Furthermore, the crucible must be heated up by a high-performance furnace which can generate the high temperatures required and also be precisely controlled andcooled. Here again, KAMC’s expertise in the materials and applications field comes to the fore. The heart of the melting plant, the so-called hot zone, is designed to respond precisely to each customer’s requirements before being constructed from high-performance materials. The thermal process technicians of KAMC’s production are closely working together to equip the high-temperature furnaces required for the production of sapphire crystals worldwide with furnace-making components.
Material |
Density |
Size |
Tungsten (99.95%) |
≥18.3g/cc (sintered) |
Wall thickness: 0.02mm-50mm Diameter:70-800mm Height: 50-700mm |
Molybdenum (99.95%) |
≥9.8g/cc (sintered) |
Wall thickness: 0.02mm-50mm Diameter:70-550mm Height: 50-700mm |
NOTE: Under vacuum or reducing atmosphere, the maximum operating temperature of tungsten crucibles is 2450℃, but 1700℃ for molybdenum crucible. |
Molybdenum sheet
After rolling and processing with deflection reaching 60% , the density of molybdenum sheet basically comes close to molybdenum’s theory density. Therefore, molybdenum sheet possesses the properties of high density, balanced internal structure and excellent high creep strength temperature. Molybdenum sheet is widely used in reflection shield, cover plate applied in the sapphire growth furnace, reflection shield, heating tape, connecting pieces applied in vacuum furnace We provide super size moly sheet 0.3*600*2000mm 0.3*750*2000mm
Molybdenum reflection shield
As the heat-shield parts in the sapphire growth furnace, the most decisive function of molybdenum reflection shield is to prevent and reflect the heat in the furnace. Heat-shield parts with high-density, exact-measurement, smooth-surface, convenient-assembly and reasonable-design has great significance in improving the crystal-pulling.
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