PRODUCTION OF POROUS MOLDED BODY FROM QUARZ GLASS WITHOUT USING TOOL AND CHILD CAST IRON COATING MATERIAL

摘要

A method is described for the production of porous bodies from vitreous silica without the use of tools. Vitreous silica wool and/or threads are wound in layers on a form. After the coil has attained a certain minimum thickness, the threads of each succeeding layer are permanently bonded by heating the threads of the preceding layer at the points where the threads cross. The form is removed, and then the threads on the inside of the body are bonded together. The bodies are used for the production of high-purity blocks of silicon for solar cells.