| 摘要 |
<P>PROBLEM TO BE SOLVED: To produce a quartz glass molded body at a high yield and at a low cost. <P>SOLUTION: A lower mold 52, a quartz glass preform 16, a pressing tool 18, a guide member 20 and a load plate 22 are sequentially placed on the circular carbon bottom plate 12 of 1 cm thickness and 50 cm diameter. An orthohexagonal column-shaped outer cylinder 14 is assembled on the outside of those by combining six carbon plates of 20 cm width, 30 cm length and 3 cm thickness, and the outer cylinder is fixed by a carbon tool to assemble a production apparatus. The quartz glass preform 16 is set within the outer cylinder, put in an electric furnace and melted by heating at 1,800°C for 2 h to thereby obtain an orthohexagonal column-shaped quartz glass molded body 16a of 20 cm length of one side and 12 cm average height having a recessed portion of 22 cm ϕ and 5 cm depth in the center of the upper surface and a recessed portion of 20 cm ϕ and 4 cm depth in the center of the lower surface. <P>COPYRIGHT: (C)2012,JPO&INPIT |
