# US 12,180,110 B2 · Glass-ceramic article

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- Number: US 12,180,110 B2
- Document ID: US12180110B2
- Status: Granted
- Kind: B2
- Application number: 17/441,521
- Filed: 2020-03-19
- Published: 2022-05-12
- Granted: 2024-12-31
- Earliest claimed: 2019-03-22
- Assignees: Eurokera S.N.C.
- Applicants: Eurokera S.N.C.
- Inventors: Théo Jegorel; Erwann Luais
- Web page: https://patentgrep.com/patent/US12180110B2

## CPC

- C03C 17/225: {Nitrides}
- C03C 2217/281: Nitrides
- C03C 2217/78: Coatings specially designed to be durable, e.g. scratch-resistant
- C03C 2218/156: by magnetron sputtering
- C03C: CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS

## Abstract

A glass-ceramic article, includes at least one substrate, such as a plate, made of glass-ceramic, the substrate being coated in at least one zone with at least one layer including zirconium silicon nitride, SixZryNz, with an atomic ratio of Zr to the sum Si+Zr, y/(x+y), of 10% to 90%.

## Claims

### Claim 1

A glass-ceramic article, comprising at least one substrate made of glass-ceramic, said substrate being coated in at least one zone with at least one layer comprising zirconium silicon nitride, SixZryNz, with an atomic ratio of Zr to the sum Si+Zr, y/(x+y), of 10% to 90%, wherein a thickness of said layer is within a range extending from 200 to 5000 nm.

### Claim 2 (depends on 1)

The glass-ceramic article as claimed in claim 1, wherein said layer is a zirconium silicon nitride layer, essentially formed to at least 85% by weight, with the exception of the impurities possibly present which do not represent more than 5% of the layer, of silicon, zirconium and nitrogen.

### Claim 3 (depends on 1)

The glass-ceramic article as claimed in claim 1, wherein said layer exhibits a hardness H of greater than 15 GPa and a modulus of elasticity E of greater than 140 GPa.

### Claim 4 (depends on 1)

The glass-ceramic article as claimed in claim 1, wherein the coating including said layer contains only a single layer comprising zirconium silicon nitride.

### Claim 5 (depends on 1)

The glass-ceramic article as claimed in claim 1, wherein the substrate is coated with at least one layer of enamel and/or of paint on or under said layer comprising zirconium silicon nitride.

### Claim 6 (depends on 1)

The glass-ceramic article as claimed in claim 1, wherein said layer is directly in contact with said substrate made of glass-ceramic, without other underlying coating layer.

### Claim 7 (depends on 1)

The glass-ceramic article as claimed in claim 1, wherein said layer, or at least one layer incorporating zirconium silicon nitride, constitutes an exterior layer of the glass-ceramic.

### Claim 8 (depends on 1)

The glass-ceramic article as claimed in claim 1, wherein said layer is coated with at least one layer having a coefficient of friction of less than 0.25.

### Claim 9 (depends on 1)

The glass-ceramic article as claimed in claim 1, wherein said layer exhibits a nitridation z ranging from 4/3 (x+y) to 5/3 (x+y).

### Claim 10 (depends on 1)

The glass-ceramic article as claimed in claim 1, wherein a content of dopant(s) in a target used, as well as in the layer, or a content of other component(s) in the layer, being less than 15% by weight.

### Claim 11 (depends on 1)

The glass-ceramic article as claimed in claim 1, wherein the substrate is a plate.

### Claim 12 (depends on 1)

The glass-ceramic article as claimed in claim 1, wherein the atomic ratio of Zr to the sum Si+Zr, y/(x+y) is from 15% to 50%.

### Claim 13 (depends on 12)

The glass-ceramic article as claimed in claim 12, wherein the atomic ratio of Zr to the sum Si+Zr, y/(x+y) is 28% to 33%.

### Claim 14 (depends on 1)

The glass-ceramic article as claimed in claim 1, wherein the thickness of said layer is within a range extending from 700 to 2500 nm.

### Claim 15 (depends on 14)

The glass-ceramic article as claimed in claim 14, wherein the thickness of said layer is within a range extending from 1000 to 1500 nm.

### Claim 16 (depends on 1)

A process for the manufacture of an article made of glass-ceramic as claimed in claim 1, said article comprising at least one substrate made of glass-ceramic, in which at least one layer comprising zirconium silicon nitride, SixZryNz, with an atomic ratio of Zr to the sum Si+Zr, y/(x+y), of 10% to 90% is deposited on at least one zone of said substrate.

### Claim 17 (depends on 16)

The process as claimed in claim 16, wherein said substrate, thus coated, is subjected to a tempering treatment or to an annealing each at a temperature of 750° C. to 900° C.

### Claim 18 (depends on 16)

The process as claimed in claim 16, wherein the deposition of said layer is carried out by cathode sputtering.

### Claim 19

A glass-ceramic article, comprising at least one substrate made of glass-ceramic, said substrate being coated in at least one zone with at least one layer comprising zirconium silicon nitride, SixZryNz, with an atomic ratio of Zr to the sum Si+Zr, y/(x+y), of 10% to 90%, wherein the glass-ceramic article is a cooking device additionally comprising one or more heating elements.