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US 10,239,779 B2Granted
Glass ceramic and method for producing same
AssigneeSchott AG
InventorsFalk Gabel, Friedrich Siebers, Evelin Weiss
Life of this patent
Estimating the term…
Abstract
A glass ceramic article is provided so that a reliable coloring with a defined transmittance is ensured. The reliable coloring of the glass ceramic article is based on a high content of iron oxide of more than 0.1 percent by weight which itself has a strongly coloring effect does not further reduce transmittance but rather interacts with vanadium oxide to attenuate the absorption caused by vanadium oxide.
Claims15
A lithium aluminosilicate glass ceramic article comprising:
- titanium oxide;
- vanadium oxide as a color-imparting component in a proportion of at least 0.005;
- tin oxide in a proportion of 0.15 to 0.5 percent by weight;
- and
- a decoloring agent consisting of iron oxide in a proportion of more than 0.1 percent by weight,
- wherein the proportion by weight of the iron oxide is greater than the proportion by weight of vanadium oxide by a factor from 5 up to a factor of 20,
- wherein the article has a light transmittance in the visible spectral range when illuminated perpendicularly to a surface of the article that is greater than 2.5%,
- wherein the proportions of the tin oxide, the titanium oxide, and the iron oxide meet a relationship of (M(SnO2)+0.1*M(TiO2))/(M(Fe2O3))<4, and
- wherein M is the respective proportion in percent by weight of the component in the following brackets.
6 more elements
A lithium aluminosilicate glass ceramic article comprising:
- titanium oxide;
- vanadium oxide as a color-imparting component in a proportion of at least 0.005;
- tin oxide in a proportion of from 0.15 to 0.5 percent by weight;
- and
- a decoloring agent comprising iron oxide in a proportion of more than 0.1 percent by weight and/or cerium oxide in a proportion of at least 0.1 percent by weight,
- wherein the decoloring agent has a proportion by weight of a sum of the iron oxide and the cerium oxide that is greater than the proportion by weight of vanadium oxide by a factor from 7.7 up to a factor of 20,
- wherein the article has a light transmittance in the visible spectral range when illuminated perpendicularly to a surface of the article that is greater than 2.5%,
- wherein the proportions of the tin oxide, the titanium oxide, and the iron oxide and/or the cerium oxide meet a relationship of (M(SnO2)+0.1*M(TiO2))/(M(Fe2O3)+M(CeO2))<4,
- wherein M is the respective proportion in percent by weight of the component in the following brackets, and
- wherein the sum of the iron oxide and the cerium oxide is at most 0.6 percent by weight.
7 more elements
Dependencies are inferred from the claim text.