| 摘要 |
<p>The present invention provides a method for producing a silica container, wherein the method comprises: a step of forming a preliminarily molded substrate, wherein a first powdered raw material (silica particles) is fed to an inner wall of an outer frame having aspiration holes while rotating the outer frame, a step of forming a preliminarily molded intermediate layer, wherein a second powdered raw material (silica particles) added with an aluminum compound or a crystal nucleating agent as an additive is fed to an inner wall of the preliminarily molded substrate, and a step of forming an inner layer, wherein the preliminarily molded substrate and the preliminarily molded intermediate layer are degassed by aspiration from a peripheral side with heating from an inside thereby forming a substrate and an intermediate layer, and while a third powdered raw material having a high silica purity is spread from inside the substrate having the formed intermediate layer with heating from the inside thereby forming an inner layer on an inner surface of the intermediate layer. Accordingly, a method for producing a silica container with a high dimensional precision, a high durability, and low gas rele,ase, and with a reduced energy consumption and a low production cost, by using a cheap and relatively low grade powdered silica as a main raw material, as well as the silica container thus produced are provided.</p> |
