Glass-ceramic article

Patent metadata

Field	Value
Publication number	US-12275667-B2
Application number	US-201916967772-A
Country	US
Kind code	B2
Filing date	Feb 18, 2019
Priority date	Feb 19, 2018
Publication date	Apr 15, 2025
Grant date	Apr 15, 2025

Abstract

The present invention relates to a glass-ceramic article comprising at least one substrate, such as a plate, made of glass-ceramic, said substrate being coated in at least one area with at least one enamel coating such that:
1) the enamel has a gloss at 60° of less than 40, 2) the coverage rate of said enamel in said area coated with said coating is 40 to 80%, 3) said enamel comprises pigments in the form of mica and/or aluminum oxide and/or silica particles coated with metal oxides or combinations of metal oxides, 4) said enamel has a roughness Ra greater than or equal to 0.4 μm, 5) said enamel has a roughness Rt greater than 4 μm.

First claim

The invention claimed is:

1. A glass-ceramic article, comprising:
at least one substrate made of glass-ceramic, wherein said substrate is coated in at least one area with at least one enamel coating such that:
1) said enamel has a gloss at 60° of less than 40;
2) the coverage rate of said enamel in said area coated with said coating is 40 to 80%;
3) said enamel comprises reflective pigments in the form of a mixture of mica particles coated with TiO 2 , mica particles coated with Fe 2 O 3 , and mica particles coated with a TiO 2 —Fe 2 O 3 —SnO 2 combination and/or aluminum oxide coated with metal oxides or combinations of metal oxides and/or silica particles coated with metal oxides or combinations of metal oxides;
4) said enamel has a roughness Ra of 0.4 μm-0.7 μm; and
5) said enamel has a roughness Rt of 4 μm-8 μm.

2. The glass-ceramic article as claimed in claim 1 , wherein said substrate is based on a glass-ceramic having intrinsically a light transmittance LT under illuminant D65 of less than 40% and an optical transmittance between 0.5 and 3% for a wavelength of 625 nm.

3. The glass-ceramic article as claimed in claim 1 , wherein the area coated with said enamel coating is at least 5 cm by 5 cm.

4. The glass-ceramic article as claimed in claim 1 , wherein a profile or pattern of said enamel coating is random and isotropic.

5. The glass-ceramic article as claimed in claim 1 , wherein said enamel comprises a proportion of B 2 O 3 less than or equal to 25% by weight.

6. The glass-ceramic article as claimed in claim 1 , wherein a thickness of said coating is between 1.5 μm and 3.5 μm.

7. The glass-ceramic article as claimed in claim 1 , wherein said enamel coating is devoid of hydrophobic character and devoid of oleophobic character.

8. The glass-ceramic article as claimed in claim 1 , wherein said area is coated with said enamel coating without preliminary treatment of said area.

9. The glass-ceramic article as claimed in claim 1 , wherein said article or said substrate is a cooktop or a worktop or a central island or a console.

10. The glass-ceramic article as claimed in claim 1 , wherein the area coated with said enamel coating is at least 10 cm by 10 cm.

11. The glass-ceramic article as claimed in claim 1 , wherein the area coated with said enamel coating is at least 20 cm by 20 cm.

12. The glass-ceramic article as claimed in claim 1 , wherein said area coated with said enamel coating is not primarily coated with a primer.

13. The glass-ceramic article as claimed in claim 1 , wherein said enamel comprises reflective pigments in the form of a mixture of mica particles coated with TiO 2 , mica particles coated with Fe 2 O 3 , and mica particles coated with a TiO 2 —Fe 2 O 3 —SnO 2 combination.

14. The glass-ceramic article as claimed in claim 1 , wherein said enamel comprises a reflective pigment in the form of aluminum oxide particles coated with a TiO 2 —SnO 2 combination or with a TiO 2 —SnO 2 —SiO 2 combination.

15. The glass-ceramic article as claimed in claim 1 , wherein said enamel comprises a reflective pigment in the form of silica particles coated with a TiO 2 —SnO 2 combination or a Fe 2 O 3 —ZrO 2 combination.

16. The glass-ceramic article as claimed in claim 1 , wherein said enamel comprises a reflective pigment in the form of aluminum oxide coated with metal oxides or combinations of metal oxides.

17. The glass-ceramic article as claimed in claim 1 , wherein said enamel comprises a reflective pigment in the form of silica particles coated with metal oxides or combinations of metal oxides.

18. The glass-ceramic article as claimed in claim 1 , wherein said coverage rate of said enamel in said area coated with said coating is 42 to 80%.

19. The glass-ceramic article as claimed in claim 1 , wherein said coverage rate of said enamel in said area coated with said coating is 55 to 78%.

20. A process for manufacturing a glass-ceramic article as claimed in claim 1 , the process comprising:
applying at least one enamel coating such that:
1) said enamel has a gloss at 60° of less than 40;
2) the coverage rate of said enamel in said area coated with said coating is 40 to 80%;
3) said enamel comprises reflective pigments in the form of a mixture of mica particles coated with TiO 2 , mica particles coated with Fe 2 O 3 , and mica particles coated with a TiO 2 —Fe 2 O 3 —SnO 2 combination and/or aluminum oxide coated with metal oxides or combinations of metal oxides and/or silica particles coated with metal oxides or combinations of metal oxides;
4) said enamel has a roughness Ra of 0.4 μm-0.7 μm; and
5) said enamel has a roughness Rt of 4 μm-8 μm;

either on at least part of a glass substrate and then performing ceramization of the glass substrate thus coated, or
on at least part of a glass-ceramic substrate and then firing the enamel.

Assignees

• Eurokera

Inventors

• Roux Nicolas
• Faillat Caroline
• Bontemps Amélie
• Guedon Thibault

Classifications

• F24C15/10

  Tops, e.g. hot plates; Rings (cover lids or splash guards F24C15/12; spillage trays or grooves F24C15/14) · CPC title

• C03C2217/78

  Coatings specially designed to be durable, e.g. scratch-resistant · CPC title

• C03C2217/77

  Coatings having a rough surface · CPC title

• C03C2218/119

  by printing · CPC title

• C03C2217/485

  Pigments · CPC title