| 摘要 |
PURPOSE:To mass-produce the titled glass in a high yield by adding liq. phosphoric acid to hydrolyzates of halides of positive elements constituting glass to form a phosphoric acid compound and vitrifying the compound by heat melting. CONSTITUTION:GaCl3 and NH4OH are introduced into reactor R to precipitate Ca(OH)3 by hydrolysis. Next, SiCl4, GeCl4, etc. are introduced into reactor R to precipitate SiO2, GeO2, etc. by hydrolysis, and H3PO4 is introduced into reactor R, where it is reacted with the precipitates to form phosphate glass contg. Si, Ge and Ga. This glass is precipitated in glass melting crucible 2 under reactor R. Crucible 2 is then separated, and the glass is freed of water by heating and further heated in a furnace at about 1,400 deg.C. The resulting transparent glass is dehydrated and drawn out of the bottom of crucible 2 to obtain a glass fiber for an optical fiber. |
