Patent ID: 9145325
Filing Date: 2015-09-29
Classification: C03B,C30B,Y10T

Abstract:
1. A method for producing a silica container comprised of at least a silica as its main component and arranged with a silica substrate having a rotational symmetry, wherein the method comprises: a step of preparing a powdered substrate's raw material comprised of silica particles for forming the silica substrate, a step of forming a preliminarily molded silica substrate, wherein the powdered substrate's raw material is fed to an inner wall of an outer frame having a rotational symmetry and aspiration holes arranged splittingly in the inner wall while rotating the outer frame thereby preliminarily molding the powdered substrate's raw material to an intended shape in accordance with the inner wall of the outer frame, and a step of forming the silica substrate, wherein the preliminarily molded silica substrate is degassed by aspiration from an outer peripheral side through the aspiration holes formed in the outer frame with controlling a humidity inside the outer frame by ventilating gases present in the outer frame with charging from inside the preliminarily molded silica substrate a gas mixture comprised of an O