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Choice Materials for Spun Crucibles
The sapphire crystal growing industry has seen a significant increase in the fabrication of crucibles for growing sapphire crystals used in the manufacture of LEDs. These crucibles have distinctive designs for melting alumina in a precise and highly controlled crystal growth environment.
Spun crucibles produced from molybdenum possess excellent thermal properties required to withstand the critical environment for growing sapphire crystals. Molybdenum is characterized by its high melting temperature, creep resistance, low thermal expansion coefficient (CTE), excellent thermal conductivity, which combined with low CTE, makes the entire crystal growing system very stable. In addition, molybdenum and other refractory metals do not contaminate the alumina melt resulting in a higher quality sapphire.