| 摘要 |
PURPOSE:To produce a quartz glass pipe contg. no crack, in high yield with satisfactory precision of dimension by charging silica sol to a bottomed cylindrical vessel provided with an inserted bar which becomes liquid at a temp. in the stage of drying the gel, letting it stand, drying the silica sol after gelatification and then sintering the dry gel. CONSTITUTION:A bar which is not eluted by silica sol, having no interaction between the silica sol and the bar, and liquefying by melting at the drying temp. of silica gel, such as paraffin, is inserted coaxially into a bottomed cylindrical vessel. Then, silica sol is poured into a space between an external periphery of the inserted bar and the internal periphery of the cylindrical vessel. The vessel is closed tightly with a cover, and the silica sol is gelled by allowing to stand. Thereafter, the cylindrical vessel is covered with a cap provided with a hole, and the gel is dried, contracted and solidified at a specified temp. Obtd. dry gel is discharged from the cylindrical vessel and sintered. Thus, a quartz glass pipe is obtd. inexpensively without being restricted by the size of the pipe. |
