Patent ID: 7993454
Filing Date: 2011-08-09
Classification: C03C,C30B,Y10S,Y10T

Abstract:
1. A process for making a surface modified glass crucible, comprising: coating at least the inside surface of a glass crucible with a liquid solution comprising a metal salt, which is one or more salts of metals selected from the group consisting of magnesium, calcium, strontium, and barium, to obtain a crucible having at least a coated inside surface, drying said crucible having a coated inside surface to thermally decompose the metal salt and to produce a transparent coated layer of a metal oxide baked on said surface of said crucible, baking said dried, coated crucible at a temperature higher than a thermal decomposition temperature of the metal salt to obtain a baked, coated crucible, wherein the baked, coated crucible is not devitrified, and wherein the dried coating liquid is baked on at a temperature of from 600 to 1200° C., for 10 to 120 minutes, without polysilicon in the crucible, and washing the baked crucible with water and drying, wherein the baking is carried out before silicon is melted in the dried, coated crucible.