Through The Near Net Shape Crystal Growth Sapphire Production Dome of The Two Methods

Large sapphire single crystals with the geometry of near net shape domes are grown by the gradient solidification method (GSM). The growth is carried out in double-wall molybdenum crucibles, and perfect crystals, free of grain boundaries and scattering centers, are produced. The process is used to grow sapphire domes with different crystallographic orientations, including the optical axis. This process significantly shortens the fabrication process of the dome, thus leading to a cheaper, high-quality, product.

The progress of the liquid-solid interface during crystal growth of sapphire and spinel using the heat exchanger method (HEM) has been studied and related to processing parameters. Crystal growth has thus been optimized to produce crystals with 95–100% of the material free of voids and scattering centers.


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