METHOD FOR PRODUCING SYNTHETIC QUARTZ GLASS OF SIO2 GRANULATE AND SIO2 GRANULATE SUITED THEREFOR

摘要

A method for producing synthetic quartz glass by fusion of SiO2 granulate involves synthesizing amorphous SiO2 primary particles, granulating the amorphous SiO2 primary particles to form an open-pore SiO2 granulate, sintering the open-pore SiO2 granulate by heating in a sintering atmosphere at a sintering temperature and for a sintering period to form a densified SiO2 granulate, and melting the densified SiO2 granulate at a melting temperature to form the synthetic quartz glass. To provide an inexpensive production of low-bubble transparent components of quartz glass despite the use of still open-pore SiO2 granulate, the sintering atmosphere, sintering temperature and sintering duration are adjusted such that the densified SiO2 granulate still comprises open pores but manifests a material-specific infrared transmission T1700 at a wavelength of 1700 nm. This transmission is in the range of 50-95% of the infrared transmission T1700 of quartz glass granules of the same material.

主权项

1. A method for producing synthetic quartz glass, comprising the following method steps:
(a) synthesizing amorphous SiO2 primary particles, (b) granulating the amorphous SiO2 primary particles to form an open-pore SiO2 granulate, (c) sintering the open-pore SiO2 granulate by heating in a sintering atmosphere at a sintering temperature and for a sintering period to form a densified SiO2 granulate, and (d) melting the densified SiO2 granulate at a melting temperature to form the synthetic quartz glass;wherein for the production of transparent quartz glass, the sintering atmosphere, the sintering temperature, and the sintering duration are adjusted during sintering in step (c) such that the densified SiO2 granulate still comprises open pores and manifests a material-specific infrared transmission T1700 at a wavelength of 1700 nm, wherein the transmission is in a range of 50-95% of the infrared transmission T1700 of quartz glass granules of the same material.