Patent ID: 8158542
Filing Date: 2012-04-17
Classification: C03B,C03C

Abstract:
1. A SiO 2 slurry for the production of quartz glass, said SiO 2 slurry comprising: a dispersion liquid and amorphous SiO 2 particles with particle sizes up to a maximum of 500 μm, wherein a majority of the volume of the SiO 2 slurry is composed of SiO 2 particles with particles sizes in the range of 1 μm to 60 μm, and SiO 2 nanoparticles with particle sizes of less than 100 nm are present in the SiO 2 slurry in a concentration in the range of 0.2% by wt. to 15% by wt. (of an entire solids content of the SiO 2 slurry), wherein the SiO 2 particles have a multimodal distribution of particle sizes with a first maximum of the size distribution in the range of 1 μm to 3 μm and a second maximum in the range of 5 μm to 50 μm, and wherein the solids content (as a percentage by weight of the SiO 2 particles and the SiO 2 nanoparticles together) is in the range of 83% to 90%.