Glass substrate with interference colouration for a facing panel
The invention relates to a glass substrate with interference coloration for a facing panel, comprising a glass sheet covered on one of the faces thereof by a stack of coatings including successively at least: a first transparent coating made from a dielectric material having an optical thickness at least greater than or equal to 5 nm and at most less than or equal to 258 nm; a semi-transparent functional coating having a geometric thickness at least greater than or equal to 0.1 nm and at most less than or equal to 50 nm; a second transparent coating made from a dielectric material and having an optical thickness at least greater than or equal to 20 nm and at most less than or equal to 300 nm; and a coating providing opacity or quasi-opacity and having a geometric thickness at least greater than or equal to 30 nm.
1. A glass substrate, comprising a glass sheet and a stack of coatings covering a face of the glass sheet, wherein the stack of coatings comprises in succession from the glass sheet:
a first transparent coating comprising a dielectric material with an optical thickness of 5.0 nm or more and 258.0 nm or less,
a semi-transparent functional coating with a geometric thickness of 0.1 nm or more and 50.0 nm or less,
a second transparent coating comprising a dielectric material with an optical thickness of 20.0 nm or more and 300.0 nm or less, and
an opacifying coating, comprising a metal, metalloid, nitride, carbide, or any combination thereof, capable of providing opacity or quasi-opacity of the stack,
wherein a geometric thickness of the opacifying coating is 50.0 nm or more, and
the glass substrate has interference coloration and is suitable for a facing panel,
wherein the first and second transparent coatings comprise at least one layer having a material selected from the group consisting of silicon oxides, mixed oxides of at least silicon and aluminum, silicon nitrides, aluminum nitrides, mixed nitrides of aluminum and silicon, silicon oxynitride, aluminum oxynitride, and mixed oxynitrides of silicon and aluminum,
wherein the semi-transparent functional coating comprises at least one layer having a metal selected from the group consisting of titanium, tungsten, niobium, chromium, nickel, copper, tantalum, zirconium, yttrium, palladium, iron, and alloys or mixtures of at least two of these metals and stainless steels, and
wherein the stack of coatings provides a visible light transmittance of at most 4%, when said stack is applied to a clear silica soda lime float glass 4 mm thick, measured with a source corresponding to the CIE standard D65 “daylight” illuminant and at a solid angle of 2°, according to standard EN410.
2. The glass substrate of claim 1 ,
wherein the semi-transparent functional coating is a metallic coating with a color attenuation thickness of 0.3 nm or more and 30.0 nm or less, and
the color attenuation thickness is a product of the geometric thickness of the functional coating multiplied by a complex part, k, of a refractive index at 550 nm of a metal in the semi-transparent functional coating.
3. The glass substrate of claim 1 , wherein the semi-transparent functional coating and the opacifying coating are metallic coatings.
4. The glass substrate of claim 1 , wherein the glass sheet consists of a clear silica soda lime glass.
5. The glass substrate of claim 1 , further comprising:
a protective coating with a geometric thickness 5.0 nm or more above the opacifying coating.
6. The glass substrate of claim 5 , wherein the protective coating comprises a layer comprising at least one material selected from the group consisting of carbon, chromium, nickel, aluminum, stainless steel, nickel-chromium metal alloy, NiCrAlY metal alloy, silicon oxides, silicon nitrides, and silicon oxynitrides.
7. The glass substrate of claim 1 , further comprising:
a further coating comprising a transparent dielectric material, between the glass sheet and the first transparent coating,
wherein the further coating is configured to improve adhesion.
8. The glass substrate of claim 1 , wherein the opacifying coating comprises a layer having a chemical composition of a layer of the semi-transparent functional coating.
9. The glass substrate of claim 7 ,
wherein the further coating comprises silicon oxynitride and has a geometric thickness of 0.0 nm or more and 50.0 nm or less,
the dielectric material of the first transparent coating is silicon nitride,
a geometric thickness of the first transparent coating is 10.0 nm or more and 129.0 nm or less,
the semi-transparent functional coating is a metallic functional coating with a color attenuation thickness of 0.3 nm or more and 30.0 nm or less,
the color attenuation thickness is a product of the geometric thickness of the functional coating multiplied by a complex part, k, of a refractive index at 550 nm of a metal in the semi-transparent functional coating,
the second transparent coating comprises, as a dielectric material, silicon nitride,
a geometric thickness of the second transparent coating is 10.0 nm or more and 150.0 nm or less, and
the opacifying coating is a metallic coating comprising a layer of stainless steel.
10. The glass substrate of claim 8 ,
wherein the first transparent coating comprises silicon nitride and has a geometric thickness of between 10.0 nm and 120.0 nm,
the semi-transparent functional coating is a metallic coating of titanium,
the geometric thickness of the semi-transparent functional coating is from 1.0 nm to 10.0 nm,
the second transparent coating comprises silicon nitride and has a geometric thickness of from 20.0 nm to 120.0 nm,
the opacifying coating comprises a first layer of titanium.
11. The glass substrate of claim 9 ,
wherein the semi-transparent functional coating comprises stainless steel,
the geometric thickness of the semi-transparent functional coating is from 0.1 nm to 10.0 nm, and
the geometric thickness of the opacifying coating is 50.0 nm or more and 1000.0 nm or less.
12. The glass substrate of claim 1 , wherein the glass substrate is toughenable.
13. A facade, comprising:
an opaque zone comprising the glass substrate of claim 1 , and a viewing zone comprising a laminated glazing,
wherein the glass substrate has the same color characteristics after toughening as those of the laminated glazing,
the glass substrate and the laminated glazing each comprise coatings on a glass sheet, and
the glass sheet of the glass substrate and the glass sheet of the laminated glazing have identical chemical composition.
14. A method for manufacturing the glass substrate of claim 1 , the method comprising:
depositing the first transparent dielectric coating by magnetic field-assisted vacuum cathode sputtering,
depositing the semi-transparent functional coating by magnetic field-assisted vacuum cathode sputtering,
depositing the second transparent dielectric coating by magnetic field-assisted vacuum cathode sputtering, and
depositing the opacifying coating by magnetic field-assisted vacuum cathode sputtering.
15. A facade facing panel comprising the glass substrate of claim 1 .
16. The glass substrate of claim 11 , wherein the layer of stainless steel in the opacifying coating is a first layer in the opacifying coating.
17. The glass substrate of claim 11 , wherein the geometric thickness of the opacifying coating is 100.0 nm or more and 200.0 nm or less.
18. The glass substrate of claim 1 , wherein the stack of coatings provides a visible light transmittance of at most 1%, when said stack is applied to a clear silica soda lime float glass 4 mm thick, measured with a source corresponding to the CIE standard D65 “daylight” illuminant and at a solid angle of 2°, according to standard EN410.
19. A glass substrate, comprising a glass sheet and a stack of coatings covering a face of the glass sheet, wherein the stack of coatings comprises in succession from the glass sheet:
a first transparent coating comprising a dielectric material with an optical thickness of 5.0 nm or more and 258.0 nm or less,
a semi-transparent functional coating with a geometric thickness of 0.1 nm or more and 50.0 nm or less,
a second transparent coating comprising a dielectric material with an optical thickness of 20.0 nm or more and 300.0 nm or less, and
an opacifying coating, comprising a metal, metalloid, nitride, carbide, or any combination thereof,
wherein a geometric thickness of the opacifying coating is 50.0 nm or more,
wherein the first and second transparent coatings comprise at least one layer having a material selected from the group consisting of silicon oxides, mixed oxides of at least silicon and aluminum, silicon nitrides, aluminum nitrides, mixed nitrides of aluminum and silicon, silicon oxynitride, aluminum oxynitride, and mixed oxynitrides of silicon and aluminum,
wherein the semi-transparent functional coating comprises at least one layer having a metal selected from the group consisting of titanium, tungsten, niobium, chromium, nickel, copper, tantalum, zirconium, yttrium, palladium, iron, and alloys or mixtures of at least two of these metals and stainless steels, and
wherein the stack of coatings provides a visible light transmittance of at most 4%, when said stack is applied to a clear silica soda lime float glass 4 mm thick, measured with a source corresponding to the CIE standard D65 “daylight” illuminant and at a solid angle of 2° , according to standard EN410.
20. The glass substrate of claim 19 , wherein the semi-transparent functional coating and the opacifying coating are metallic coatings.