Method of manufacturing a lithium aluminosilicate glass product for a glass-ceramic product

Patent metadata

Field	Value
Publication number	US-11548809-B2
Application number	US-201816614153-A
Country	US
Kind code	B2
Filing date	May 16, 2018
Priority date	May 18, 2017
Publication date	Jan 10, 2023
Grant date	Jan 10, 2023

Abstract

A method of manufacturing a lithium aluminosilicate glass product suitable for making a glass-ceramic product, includes melting a vitrifiable mixture of raw materials, which are free from arsenic oxides and antimony oxides, apart from unavoidable traces, refining the molten material, cooling the molten material so as to form a glass, forming of the glass, wherein the vitrifiable mixture of raw materials includes petalite having a fraction by weight of total iron, expressed as Fe2O3, less than or equal to 200 ppm.

First claim

The invention claimed is:

1. A method of manufacturing a lithium aluminosilicate glass product comprising:
a. melting a vitrifiable mixture of raw materials to form a molten material,
b. refining the molten material,
c. cooling said molten material so as to form a glass,
d. forming of said glass,

wherein said vitrifiable mixture of raw materials comprises petalite having a fraction by weight of total iron, expressed as Fe 2 O 3 , less than or equal to 200 ppm, and
wherein the fraction by weight of said petalite in said vitrifiable mixture of raw materials is at least 50%.

2. The method as claimed in claim 1 , wherein the mixture of vitrifiable materials is free from arsenic oxides and antimony oxides, apart from unavoidable traces.

3. The method as claimed in claim 1 , wherein a refining temperature in step b is at most 1700° C.

4. The method as claimed in claim 1 , wherein said petalite comprises petalite mineral in a fraction by weight greater than or equal to 90%.

5. The method as claimed in claim 1 , wherein said petalite has a fraction by weight of total iron, expressed as Fe 2 O 3 , less than or equal to 100 ppm.

6. The method as claimed in claim 1 , wherein said vitrifiable mixture of raw materials comprises one or more fining agents selected from SnO 2 , CeO 2 , MnO 2 , fluorides and chlorides.

7. The method as claimed in claim 6 , wherein said fining agent is SnO 2 , and the fraction by weight of said SnO 2 in the final glass is less than 0.5%.

8. The method as claimed in claim 1 , wherein the fraction by weight of total iron, expressed as Fe 2 O 3 , in the vitrifiable mixture of raw materials is between 4 ppm and 200 ppm.

9. The method as claimed in claim 1 , wherein the glass obtained comprises the following constituents in the ranges defined below expressed in fractions by weight:

SiO 2
52-75%

Al 2 O 3
12-27%

Li 2 O
 2-5.5%

Na 2 O
 0-3%,

K 2 O
 0-3%,

CaO
 0-5%,

MgO
 0-5%,

SrO
 0-5%,

BaO
 0-5%,

ZnO
 0-5%,

TiO 2
 1-6%,

ZrO 2
 0-3%,

P 2 O 5
 0-8%.

10. A glass product obtainable by the method as claimed in claim 1 .

11. The method as claimed in claim 1 , further comprising a ceramizing step e).

12. A glass-ceramic product obtainable by the method as claimed in claim 11 .

13. Cooking equipment, fireplace insert, glazing for fire protection comprising a glass-ceramic product as claimed in claim 12 .

14. The method as claimed in claim 3 , wherein a refining temperature in step b is at most 1550° C.

15. The method as claimed in claim 1 , wherein the fraction by weight of said petalite in said vitrifiable mixture of raw materials is at least 80%.

16. The method as claimed in claim 1 , wherein said petalite has a fraction by weight of total iron, expressed as Fe 2 O 3 , less than or equal to 50 ppm.

17. The method as claimed in claim 7 , wherein said fining agent is SnO 2 , and the fraction by weight of said SnO 2 in the final glass is between 0.4% and 0.1%.

18. A method of manufacturing a lithium aluminosilicate glass product comprising:
a. melting a vitrifiable mixture of raw materials to form a molten material,
b. refining the molten material,
c. cooling said molten material so as to form a glass,
d. forming of said glass,

wherein said vitrifiable mixture of raw materials comprises petalite having a fraction by weight of total iron, expressed as Fe 2 O3, less than or equal to 200 ppm, and
wherein said petalite has a fraction by weight of fluorine greater than or equal to 0.10%.

19. A method of manufacturing a lithium aluminosilicate glass product comprising:
a. melting a vitrifiable mixture of raw materials to form a molten material,
b. refining the molten material,
c. cooling said molten material so as to form a glass,
d. forming of said glass,

wherein said vitrifiable mixture of raw materials comprises petalite having a fraction by weight of total iron, expressed as Fe 2 O 3 , less than or equal to 200 ppm, and
wherein the mixture of raw materials comprises nitrates of alkali metals or of alkaline earths, and wherein an amount of the nitrates of alkali metals or of alkaline earths is in a fraction by weight of greater than 0% and at most 4%.

Assignees

• Eurokera

Inventors

• Cochard Jean-Patrick
• Di Pierro Simonpietro
• Lecomte Emmanuel

Classifications

• C03C1/004

  Refining agents (refining C03B5/225) · CPC title

• C03C1/00 Primary

  Ingredients generally applicable to manufacture of glasses, glazes, or vitreous enamels · CPC title

• C03C3/085

  containing an oxide of a divalent metal · CPC title

• C03C10/0027 Primary

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

• C03C2203/10

  Melting processes · CPC title