Patent ID: 6351972
Filing Date: 2002-03-05
Classification: C03B,C03C

Abstract:
A method for producing a synthetic fused silica member comprising vaporizing a raw material silane compound, hydrolyzing or oxidizing by combustion the vaporized silane compound in oxyhydrogen flame to form silica microparticles so that the silica microparticles deposit on a rotating refractory carrier, and melting the silica microparticles during the deposition to form the synthetic fused silica member, wherein the raw material silane compound is represented by the formula (1):RnSiX4âˆ’nâ€ƒâ€ƒ(1) wherein R each represents hydrogen atom or a monovalent aliphatic hydrocarbon group, which may be identical or different, X represents a halogen atom, and n represents an integer of 0-3, or the formula (2): SixRyOzâ€ƒâ€ƒ(2) wherein R has the same meaning as defined above, x represents an integer not less than 2, y represents a positive integer not more than 2x+2, and z represents a positive integer not more than 2x, is prepared and the sulfur impurities are preliminarily removed from the raw material by absorption with activated carbon after distillation.