SHEET-LIKE GLASS ARTICLE, METHOD FOR PRODUCING SAME, AND USE THEREOF

Abstract

A chemically toughenable or toughened sheet-like glass article is provided. The article has a glass with a composition comprising Al.sub.2O.sub.3, SiO.sub.2, Li.sub.2O, and Na.sub.2O, wherein (Al.sub.2O.sub.3)−(Li.sub.2O+Na.sub.2O), in mol %, is less than 0; a thickness between 0.3 mm and 4 mm; a light transmittance of at least 0.001% to at most 60% at 450 nm, of at least 0.001% to at most 30% at 540 nm, and of at least 0.001% to at most 30% at 630 nm; and an IR transmittance of at least 10% to not more than 99% at any wavelength in a wavelength range from 900 nm to 1100 nm. The light and IR transmittances are determined for a thickness of the article of 1 mm.

Claims

1. A chemically toughenable or toughened sheet-like glass article, comprising: a glass with a composition comprising Al.sub.2O.sub.3, SiO.sub.2, Li.sub.2O, and Na.sub.2O, wherein (Al.sub.2O.sub.3)−(Li.sub.2O+Na.sub.2O), in mol %, is less than 0; a thickness between 0.3 mm and 4 mm; a light transmittance of at least 0.001% to at most 60% at 450 nm, of at least 0.001% to at most 30% at 540 nm, and of at least 0.001% to at most 30% at 630 nm; and an IR transmittance of at least 10% to not more than 99% at any wavelength in a wavelength range from 900 nm to 1100 nm, wherein the light transmittance and the IR transmittance are determined for a thickness of the article of 1 mm.

2. The article of claim 1, wherein the composition further comprises K.sub.2O and/or B.sub.2O.sub.3, and wherein (Al.sub.2O.sub.3+B.sub.2O.sub.3)−(Li.sub.2O+Na.sub.2O+K.sub.2O), all in mol %, is less than 0.

3. The article of claim 1, further comprising at least 0.1 mol % and at most 5 mol % of at least one color-imparting component.

4. The article of claim 3, wherein the at least one color-imparting component is selected from a group consisting of CoO, Fe.sub.2O.sub.3, TiO.sub.2, Cr.sub.2O.sub.3, MnO, and any mixtures thereof.

5. The article of claim 1, wherein the light transmittance is at least 0.1% at 450 nm, at 540 nm, and at 630 nm.

6. The article of claim 1, wherein: the composition comprises 0.1 mol % to 2 mol % of CoO, the light transmittance is at least 20% and up to at most 60% at 450 nm, at most 20% at 540 nm, and at most 20% at 630 nm, and the IR transmittance of at least 20% from 900 nm to 1100 nm.

7. The article of claim 1, wherein the composition comprises 0.3 mol % to 1.5 mol % of CoO.

8. The article of claim 1, wherein: the composition comprises 0.5 mol % to 5 mol % of Fe.sub.2O.sub.3 and 0.5 mol % to 3 mol % of TiO.sub.2, the light transmittance is at most 20% at 450 nm, at most 30% at 540 nm, and at most 30% at 630 nm, and the IR transmittance is at least 10% from 900 nm to 1100 nm.

9. The article of claim 8, wherein the composition further comprises between 0.1 mol % and 1 mol % of CoO.

10. The article of claim 8, wherein the composition comprises between 1.5 mol % to 4 mol % of Fe.sub.2O.sub.3 and/or 1 mol % to 2.5 mol % of TiO.sub.2.

11. The article of claim 1, wherein: the composition comprises 0.1 mol % to 1 mol % of Cr.sub.2O.sub.3 and 0.5 mol % to 4 mol % of MnO, the light transmittance is at most 10% at 450 nm, at most 20% at 540 nm, and at most 30% at 630 nm, and the IR transmittance is at least 10% from 900 nm to 1100 nm.

12. The article of claim 11, wherein the composition comprises 0.2 mol % to 0.6 mol % of Cr.sub.2O.sub.3 and/or 1 mol % to 3 mol % of MnO.

13. The article of claim 1, further comprising a compressive stress (Cs) at a surface of the glass from at least 200 MPa to at most 1100 MPa, a compressive stress (Cs30) at a depth of 30 μm of at least 50 MPa up to 300 MPa, and a depth of compressive layer (DoCL) between 0.054 and 0.3*t, wherein t is the thickness of the glass in μm.

14. The article of claim 1, wherein the thickness is at least 0.3 mm, preferably at least 0.5 mm, and/or at most 2.5 mm, and preferably not more than 2 mm.

15. The article of claim 1, wherein the composition comprises, in mol %: TABLE-US-00007 SiO.sub.2 60 to 70; B.sub.2O.sub.3 0 to 7; Al.sub.2O.sub.3 10 to 15; Li.sub.2O 7 to 12; Na.sub.2O 0.5 to 11; K.sub.2O 0 to 1; MgO 0 to 5; P.sub.2O.sub.5 0 to 3; and ZrO.sub.2 0 to 5.

16. The article of claim 15, wherein the composition comprises, in mol %: TABLE-US-00008 SiO.sub.2 63 to 68; B.sub.2O.sub.3 is not contained at all apart from impurities; Al.sub.2O.sub.3 10 to 13; Li.sub.2O 7 to 11; Na.sub.2O 1 to 10; and P.sub.2O.sub.5 0.2 to 2.

17. The article of claim 1, wherein the glass is configured for a use selected from a group consisting of a back cover sheet for a display device, a back cover sheet for a computer screen, a back cover sheet for a measurement device, a back cover sheet for a television set, a back cover plate for a mobile terminal, a back cover plate for a mobile data processing device, a back cover plate for a mobile phone, a back cover plate for a mobile computer, a back cover plate for a palmtop, a back cover plate for a laptop, a back cover plate for a tablet computer, a back cover plate for a wearable device, a back cover plate for watch, and a back cover plate for a time measuring device.

18. A method for producing a toughened glass article (10) as claimed in any of claims 1 to 7, comprising the steps of performing an ion exchange in the glass article (10) in an exchange bath that comprises between at least 10 wt % and up to 100 wt % of a sodium salt, preferably sodium nitrate NaNO.sub.3, over a duration of at least 2 hours, preferably at least 4 hours, and not more than 24 hours, at a temperature between at least 380° C. and at most 440° C., wherein optionally a potassium salt can be added to the exchange bath, in particular potassium nitrate KNO.sub.3, in particular such that the total contents of sodium salt and potassium salt add up to 100 wt %; and performing a second ion exchange in the glass article (10) in an exchange bath that comprises between 0 wt % and 10 wt % of a sodium salt, preferably sodium nitrate NaNO.sub.3, based on the total amount of salt, over a duration of at least one hour and at most 6 hours, at a temperature of the exchange bath of at least 380° C. and at most 440° C., wherein a potassium salt is added to the exchange bath, most preferably potassium nitrate KNO.sub.3, in particular such that the total contents of sodium salt and potassium salt add up to 100 wt %; and optionally one or more further ion exchange steps.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0085] The invention will be explained in more detail below with reference to figures, wherein:

[0086] FIG. 1 is a schematic view, not true to scale, of a glass article according to one embodiment; and

[0087] FIG. 2 shows transmittance profiles of the three exemplary glasses.

DETAILED DESCRIPTION

[0088] FIG. 1 shows, schematically and not true to scale, a sheet-like glass article 10 according to embodiments of the present disclosure. The sheet-like glass article 10 is flat here, but more generally, without being limited to a specific embodiment, it may also be curved or bent. The glass article 10 is sheet-like by virtue of having a thickness t that is smaller than the width and the length of the glass article. The length and width of the glass article define its faces (also referred to as main surfaces), namely the upper side and the lower side or, depending on the orientation of the glass article, the front and back sides.

[0089] FIG. 2 shows transmittance profiles for the three exemplary glasses listed in the table above. Transmittance profile 1 was obtained for exemplary glass 1, transmittance profile 2 for exemplary glass 2, and transmittance profile 3 for exemplary glass 3.

LIST OF REFERENCE NUMERALS

[0090] 10 Glass article [0091] 1, 2, 3 Transmittance profiles [0092] t Thickness of 10