Patent ID: 8920878

Claim:
A method for producing a coated component of quartz glass, said method comprising: providing a base body of quartz glass that has a coating surface; applying onto said coating surface a SiO 2 slurry layer by spraying a SiO 2 slurry thereon; drying the slurry layer so as to obtain a green body layer, and sintering the green body layer so as to obtain a SiO 2 -containing functional layer, wherein the slurry contains the following components in a dispersion liquid: (a) splintery amorphous SiO 2 granules with a gain size distribution having a D 550 value in a range between 3 μm and 30 μm, wherein the splintery amorphous SiO 2 granules are present with a weight fraction in a range of 20% by wt. to 60% by wt., based on the total solids content, (b) spherical amorphous SiO 2 particles with a particle size distribution with a D 50 value in a range between 1 μm and 50 μm, with a weight fraction of at least 30% by wt., based on the total solids content, (c) SiO 2 nanoparticles with particle sizes of less than 100 nm with a weight fraction between 0.2% by wt. and 10% by wt, based on the total solids content, (d) a non-ionic, alkali-free surfactant with a fraction in a range from 0.005% to 0.5%, based on the volume of the dispersion liquid.