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AssigneeHeraeus Quarzglas GmbH & Co. KG
InventorsAndreas GÖTZENDORFER, Gerrit SCHEICH, Nadine TSCHOLITSCH, Joerg HAMMERSCHMIDT, Miriam Sonja HÖNER
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Producing a molded body made of opaque quartz glass includes providing SiO2 grains obtained by comminuting quartz glass having a purity of at least 99.9 wt % SiO2, forming a slurry containing a suspension liquid and the SiO2 grains and which has a total solids content, wet grinding the SiO2 grains in the slurry so as to form ground SiO2 grain particles, forming a porous green body from the slurry, and sintering the porous green body. To provide a low cost quartz glass, the wet grinding of the SiO2 grains takes place at least temporarily in the presence of SiO2 nanoparticles, the proportion of which in the total solids content of the slurry is in the range of 0.1 wt % to 10 wt %, and the slurry has a solids content in the range of 76 to 80 wt % after addition of the SiO2 nanoparticles and after the wet grinding.
A method for producing a molded body made of opaque quartz glass, comprising:
A molded body comprising opaque, pore-containing quartz glass having a closed porosity, a chemical purity of at least 99.9 wt % SiO2, a density in the range of 2.14 to 2.19 g/cm3, characterized in that the quartz glass has a homogeneity defined by the fact that the molded body has a first volume area with a maximum density and a second volume area with a minimum density, wherein the difference in density between the maximum density and the minimum density is less than 0.026 g/cm3.
Dependencies are inferred from the claim text.