Glass-ceramic article and enamel suitable for the coating thereof

Patent metadata

Field	Value
Publication number	US-10527291-B2
Application number	US-201414766920-A
Country	US
Kind code	B2
Filing date	Feb 10, 2014
Priority date	Feb 11, 2013
Publication date	Jan 7, 2020
Grant date	Jan 7, 2020

Abstract

The present invention relates to a glass-ceramic article at least partly coated with at least one layer of an enamel formed from a glass frit having the following composition, the proportions being expressed as weight percentages:

SiO 2
50-66% and preferably 50 < SiO 2 ≤ 65%

MgO
3-8% and preferably 3-6%

Na 2 O
7-15%

K 2 O
≤3%

Li 2 O
≤3%, in particular ≤2%

CaO
≤1%

BaO
>0-15% and preferably 5-15%

Al 2 O 3
3-20% and preferably 3 < Al 2 O 3 < 20%

ZrO 2
0-4%, preferably 0 < ZrO 2 < 4%, in particular 0.5-2%

ZnO
>0-5%

B 2 O 3
>0-6% and preferably 0 < B 2 O 3 ≤ 5%

the sum of the alkaline-earth metal oxides CaO+BaO moreover being between 8 and 15%, and the sum of the alkali metal oxides Na 2 O+K 2 O+Li 2 O moreover being between 7 and 20%. The invention also relates to the reinforced glass-ceramics obtained.

First claim

The invention claimed is:

1. A glass-ceramic article at least partly coated with at least one layer of an enamel formed from a glass frit having the following composition:

SiO 2
50-66% by weight;

MgO
3-8% by weight;

Na 2 O
7-15% by weight;

K 2 O
≤3% by weight;

Li 2 O
≤3% by weight;

CaO
≤1% by weight;

BaO
7-15% by weight;

Al 2 O 3
>3-20% by weight;

ZrO 2
0-4% by weight;

ZnO
>0-5% by weight; and

B 2 O 3
>0-6% by weight,

wherein:
a sum of alkaline-earth metal oxides CaO+BaO is between 8 and 15% by weight; and
a sum of alkali metal oxides Na 2 O+K 2 O+Li 2 O is between 7 and 20% by weight.

2. The glass-ceramic article of claim 1 , wherein the glass frit comprises more than 4% by weight of alumina Al 2 O 3 .

3. The glass-ceramic article of claim 1 , wherein the glass frit comprises at least one of
more than 7% by weight of Na 2 O, and
less than 13% by weight of BaO.

4. The glass-ceramic article of claim 1 , wherein the glass frit comprises at most 2% by weight of Li 2 O.

5. The glass-ceramic article of claim 1 , wherein the article is formed from a glass-ceramic comprising less than 0.2% by weight of arsenic oxides.

6. The glass-ceramic article of claim 1 , wherein the article is coated with the at least one layer of enamel on at least one part of its upper face.

7. A device for baking or for maintaining a high temperature, the device comprising the glass-ceramic article of claim 1 and one or more heating elements.

8. The glass-ceramic article of claim 1 , wherein the glass frit comprises more than 5% by weight of alumina Al 2 O 3 .

9. The glass-ceramic article of claim 1 , wherein the glass frit comprises more than 7% by weight of alumina Al 2 O 3 .

Assignees

• Eurokera

Inventors

• Lecomte Emmanuel
• Rouillon Marie-Helene
• Faillat Caroline
• Vilato Pablo
• Baret Bertrand

Classifications

• C03C17/04

  by fritting glass powder · CPC title

• C03C8/04

  containing zinc · CPC title

• F24C15/04 Primary

  with transparent panels · CPC title

• C03C10/0027

  containing SiO2, Al2O3, Li2O as main constituents · CPC title

• C03C3/093 Primary

  containing zinc or zirconium · CPC title