| 摘要 |
PURPOSE:To obtain a blue sapphire contg. no inclusion such as bubbles, etc. and being colored uniformly from the external peripheral part to the central part by synthesizing blue sapphire from powder raw materials consisting of aluminium oxide, a specified amt. of titanium oxide and iron oxide by the sintering process of raw material bar using an FZ furnace. CONSTITUTION:A desired blue sapphire is obtd. by using powdery raw material consisting fundamentality of aluminium oxide with 0.5-5wt% titanium oxide and iron oxide as additive component, and using an FZ furnace for sintering the raw material bar. The raw material bar is sintered preferably at >=1,800 deg.C in the reducing atmosphere arranging the sintering bar at high density. Any reducing gas may be used but CO or H2 is especially preferred. |
