Patent ID: 6106610
Filing Date: 2000-08-22
Classification: C03B,C30B,Y02P,Y10S

Abstract:
A method for producing a quartz glass crucible for pulling up silicon single crystals, comprising the following steps:(a) forming a pre-molding by feeding powdered silicon dioxide into a mold, and by then forming it into a layer along an inner surface of the mold;(b) forming a crucible base body of a translucent quartz glass layer by heating said pre-molding from the inner side, thereby partially melting said powdered silicon dioxide, followed by cooling and solidifying the melt;(c) forming a crystallization promoter-containing layer along the internal wall surface of said crucible base body by scattering the crystallization promoter on the surface of the internal wall of the crucible body during or after forming the crucible base body, andd) forming a synthetic quartz glass inner layer by scattering and fusing a powder of silicon dioxide on the crystallization promoter-containing layer that is formed along the internal wall surface of said crucible base body.