Lead-free and cadmium-free glass for glazing, enamelling and decorating glasses or glass-ceramics
OwnerIna Mitrainventor
Life of this patent
Estimating the term…
Abstract
A lead and cadmium free glass for decorating and enamelling glasses or glass-ceramics having a small coefficient of thermal expansion is disclosed comprising the following components (in wt.-%): Σ (Li2O+Na2O+K2O) 0 to 10, Σ (MgO+CaO+SrO)≧0.1, SiO2>65. Preferably, the glass according to the invention is mixed as a glass frit with pigments, fillers and other additions and applied to glasses or glass-ceramics having a very small thermal expansion. Bending strengths of more than 70 MPa can be reached, in particular when coating substrates made of lithium aluminum silicate glass-ceramics.
Claims20
A lead-free and cadmium-free glass for glazing, enamelling or decorating glasses or glass-ceramics, comprising (in % by weight):
- Li2O
- 0-8
- Na2O
- 0-8
- K2O
- 0-8
- Al2O3
- 0-10
- B2O3
- 6.5-35
- MgO
- 0.1-12
- SrO
- 0-16
- CaO
- 0-12
- BaO
- 0-13
- ZnO
- 0-17
- SiO2
- >65-75;
- wherein the sum of alkali metal oxides R2O is between 0.1 and 10 wt.-%.
A lead-free and cadmium-free glass for glazing, enamelling or decorating glasses or glass-ceramics, comprising (in % by weight):
- Li2O
- 0-8
- Na2O
- 0-8
- K2O
- 0-8
- B2O3
- 6.5-30
- MgO
- 0.1-12
- SrO
- 0-16
- CaO
- 0-12
- BaO
- 0-13
- ZnO
- 0-17
- SiO2
- 66-75;
- wherein the sum of the alkali metal oxides is between 0.1 and 8 wt.-%;
- and
- wherein the sum of the components selected from the group formed by MgO, CaO, SrO and BaO is at least 1% by weight.
A method of coating a body consisting a glass-ceramic having a coefficient of thermal expansion of no more than 3·10−6/K in the temperature range between 20 and 700° C., the method comprising the steps of:
- preparing a glass comprising (in % by weight):
- Li2O
- 0-8
- Na2O
- 0-8
- K2O
- 0-8
- Al2O3
- 0-10
- B2O3
- 6.5-35
- MgO
- 0.1-12
- SrO
- 0-16
- CaO
- 0-12
- BaO
- 0-13
- ZnO
- 0-17
- SiO2
- >65-75;
- wherein the sum of alkali metal oxides is between 0.1 and 10 wt.-%;
- milling the glass to prepare a glass frit therefrom;
- mixing the glass frit with additives to prepare a mixture;
- applying the mixture onto a surface of a body to be coated;
- firing the body with the applied mixture at a temperature between 800 and 1200° C.;
- and
- cooling the body to room temperature.
Dependencies are inferred from the claim text.