Sapphire ingot is grown by melting high-purity aluminum oxide and allowing it to solidify around an oriented seed crystal under carefully controlled thermal conditions. The objective is to produce a large single crystal with the required orientation, low internal stress, uniform composition, and minimal bubbles, inclusions, cracks, or dislocations.
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2026-08-27
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2026-07-26Sapphire crystal ingots are synthetic single crystals of alpha-aluminum oxide, Al₂O₃, grown as starting material for wafers and parts. Unlike polycrystalline alumina, each ingot has a continuous ordered lattice. The quality of sapphire crystal ingot material determines how much usable area remains after orientation, cutting, and polishing.