Patent ID: 7381266

Claim:
A sapphire crystal growth method, comprising: a first step of grinding including crushing and grinding a powder of an aluminum oxide into micro powder particles; a second step of purification including purifying the powder particles of the aluminum oxide to reach a purity more than 99.999%; a third step of spraying and drying particles including stirring the purified powder particles of the aluminum oxide to form a glue-shaped aluminum oxide, pressurizing the glue-shaped aluminum oxide, spraying the glue-shaped aluminum oxide, and drying the glue-shaped aluminum oxide to form aluminum oxide particles having uniform sizes; a fourth step of adding organic bonding agent including adding an organic bonding agent into the aluminum oxide particles having uniform sizes; a fifth step of press molding including press molding the aluminum oxide particles having uniform sizes to form an aluminum oxide blank; a sixth step of crystal growth including pre-burning the aluminum oxide blank into an aluminum oxide cake disposed at a half-baked state, heating the aluminum oxide cake into a melted state until aluminum oxide crystals are grown, and solidifying, cooling and shrinking the aluminum oxide crystals into a single-crystal sapphire.