| 摘要 |
<p>The present invention is a method for producing a silica container arranged with a substrate, having a rotational symmetry, comprised of mainly a silica, and containing gaseous bubbles at least in its peripheral part, and an inner layer, formed on an inner surface of the substrate and comprised of a transparent silica glass; wherein a powdered silica, having particle diameter of 10 to 1000 µm, containing Ca, Sr, and Ba with the total concentration of 50 to 5000 ppm by weight, and releasing hydrogen molecules with the amount of 3×10 16 to 3×10 19 molecules/g upon heating at 1000°C under vacuum, is prepared at least as a powdered raw material for forming the inner layer, and then the inner layer is formed from the powdered silica as the powdered raw material for forming the inner layer. Accordingly, provided by the present invention are; a silica container, producible in a low cost, comprised of a thick transparent silica glass layer not substantially containing gaseous bubbles in its inner wall, and having a high dimensional precision and a high durability at high temperature; a method for producing the silica container; a powdered silica for producing the silica container; and a method for producing the powdered silica.</p> |
