US 12,030,807 B2
Glass-ceramic article
Nicolas Roux, Chateau-Thierry (FR); Caroline Faillat, Belleau (FR); Amélie Bontemps, Mezy-Moulins (FR); and Thibault Guedon, Paris (FR)
Assigned to EUROKERA S.N.C., Chateau-Thierry (FR)
Appl. No. 16/967,762
Filed by EUROKERA S.N.C., Chateau-Thierry (FR)
PCT Filed Feb. 18, 2019, PCT No. PCT/FR2019/050360
§ 371(c)(1), (2) Date Aug. 6, 2020,
PCT Pub. No. WO2019/158881, PCT Pub. Date Aug. 22, 2019.
Claims priority of application No. 1851395 (FR), filed on Feb. 19, 2018.
Prior Publication US 2020/0361813 A1, Nov. 19, 2020
Int. Cl. C03C 17/04 (2006.01); C03C 10/00 (2006.01); C03C 14/00 (2006.01)
CPC C03C 17/04 (2013.01) [C03C 10/009 (2013.01); C03C 14/006 (2013.01); C03C 2214/16 (2013.01); C03C 2217/228 (2013.01); C03C 2217/283 (2013.01); C03C 2217/452 (2013.01); C03C 2217/77 (2013.01); C03C 2217/78 (2013.01); C03C 2218/10 (2013.01)] 20 Claims
 
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; and
2) the coverage rate of said enamel in said area coated with said coating is 40 to 80%,
and wherein said enamel:
3a) is free of pigments in the form of mica particles coated with metal oxides or combinations of metal oxides, aluminum oxide particles coated with metal oxides or combinations of metal oxides, and silica particles coated with metal oxides or combinations of metal oxides; and
3b) has a roughness Ra greater than or equal to 0.4 μm and/or a luminosity L* greater than 50.
 
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; and
2) the coverage rate of said enamel in said area coated with said coating is 40 to 80%,
and wherein said enamel:
3a) is free of pigments in the form of mica Particles coated with metal oxides or combinations of metal oxides, aluminum oxide particles coated with metal oxides or combinations of metal oxides, and silica particles coated with metal oxides or combinations of metal oxides; and
3b) has a roughness Ra greater than or equal to 0.4 μm and/or a luminosity L* greater than 50,
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.