NON-FLAT FORMED GLASS, METHOD FOR PRODUCING SAME, AND USE THEREOF

Abstract

A formed or non-flat formed glass is provided that exhibits high transmittance to electromagnetic radiation in a range of wavelengths from 200 nm to 1500 nm. The transmittance for the formed or non-flat formed glass having a thickness of 1 mm is 20% or more at a wavelength of 254 nm, 82% or more at a wavelength of 300 nm, 90% or more at a wavelength of 350 nm, 92% or more at a wavelength of 546 nm, 92.5% or more at a wavelength of 1400 nm, 91.5% or more in a wavelength range from 380 nm to 780 nm, and 92.5% or more in a wavelength range from 780 nm to 1500 nm.

Claims

1. A non-flat formed glass comprising a transmittance to electromagnetic radiation for non-flat formed glass having a thickness of 1 mm that is 20% or more at a wavelength of 254 nm, 82 or more at a wavelength of 300 nm, 90% or more at a wavelength of 350 nm, 92% or more at a wavelength of 546 nm, 92.5% or more at a wavelength of 1400 nm, 91.5% or more in a wavelength range from 380 nm to 780 nm, and 92.5% or more in a wavelength range from 780 nm to 1500 nm.

2. The non-flat formed glass of claim 1, wherein the transmittance is 60% or more at the wavelength of 254 nm, 90% or more at the wavelength of 300 nm, 91% or more at the wavelength of 350 nm, 92.5% or more at the wavelength of 546 nm, 93% or more at the wavelength of 1400 nm, 92% or more in the wavelength range from 380 nm to 780 nm, and 93% or more in the wavelength range from 780 nm to 1500 nm.

3. The non-flat formed glass of claim 1, wherein the transmittance is 85% at the wavelength of 254 nm and 91% or more at the wavelength of 300 nm.

4. The non-flat formed glass of claim 1, wherein the transmittance is 88% or more at the wavelength of 254 nm.

5. The non-flat formed glass of claim 1, further comprising a content of oxides of network formers of not more than 98 mol % in total.

6. The non-flat formed glass of claim 5, wherein the oxides of network formers comprise oxides of silicon and/or boron.

7. The non-flat formed glass of claim 1, further comprising a coefficient of linear thermal expansion α between 2.4*10.sup.−6/K and 3.5*10.sup.−6/K.

8. The non-flat formed glass of claim 1, further comprising a content of SiO.sub.2 of at least 68 mol %.

9. The non-flat formed glass of claim 8, wherein the content of SiO.sub.2 is at most 85 mol %.

10. The non-flat formed glass of claim 9, wherein the content of SiO.sub.2 is at least 76 mol %.

11. The non-flat formed glass of claim 1, further comprising a content of B.sub.2O.sub.3 between 10 mol % and 25 mol %.

12. The non-flat formed glass of claim 11, wherein the content of B.sub.2O.sub.3 is at most 22 mol %.

13. The non-flat formed glass of claim 1, further comprising Σ(SiO.sub.2+B.sub.2O.sub.3) of 87 mol % to 98 mol %.

14. The non-flat formed glass of claim 13, wherein the Σ(SiO.sub.2+B.sub.2O.sub.3) is at least 92 mol %.

15. The non-flat formed glass of claim 1, further comprising ΣR.sub.2O that is between 1 mol % and 6 mol %, wherein R.sub.2O is alkali metal oxides.

16. The non-flat formed glass of claim 1, further comprising a ratio of molar amounts of B.sub.2O.sub.3/SiO.sub.2 between 0.12 to 0.35 and/or Σ(Me.sub.xO.sub.y)/(Σ(SiO.sub.2+B.sub.2O.sub.3) is 0.02 to 0.10, wherein Me represents a metal which usually has an oxidation number y in oxides.

17. The non-flat formed glass of claim 1, further comprising a ratio of weight fractions of ions of iron that satisfies: 0.1≤Fe.sup.2+/(Fe.sup.2++Fe.sup.3+)≤0.3.

18. The non-flat formed glass of claim 1, wherein for the weight fractions, in ppm, of Fe, Co, Ni, Cr, Cu, Mn, and V, the following applies: Σ(1*Fe+300*Co+70*Ni+50*Cr+20*Cu+5*Mn+2*V) [ppm by mass] is less than 200 ppm, wherein a total content of considered metals is considered irrespective of an oxidation state thereof.

19. The non-flat formed glass of claim 1, further comprising a property selected from a group consisting of: a transformation temperature between 350° C. and 550° C.; a viscosity η wherein Ig η has a value of 4 at temperatures between 1000° C. and 1320° C.; a refractive index at a light wavelength of 587.6 nm that is less than 1.479; a value of chemical resistance against water according to DIN ISO 719 class HGB 1; a value of chemical resistance against acids according to DIN 12116 class S 1 W; and a value of chemical resistance against alkalis according to DIN ISO 695 class A3 or better.

20. The non-flat formed glass of claim 1, comprising: SiO.sub.2 68 mol % to 85 mol %; B.sub.2O.sub.3 10 mol % to 25 mol %; Al.sub.2O.sub.30.2 mol % to 3.5 mol %; Na.sub.2O 0.5 mol % to 5.0 mol %; K.sub.2O 0 mol % to 1.5 mol %; and Li.sub.2O 0 mol % to 2.5 mol %, wherein the alkali metal oxides Na.sub.2O, K.sub.2O, Li.sub.2O amount to less than 6 mol % in total.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0173] FIG. 1 shows curves of spectral transmittance for electromagnetic radiation in the wavelength range from 200 nm to 1500 nm for formed glass according to the invention;

[0174] FIG. 2 shows a further transmittance spectrum in the wavelength range from 200 nm to 800 nm for the exemplary glass 8 in comparison with selected comparative glasses; and

[0175] FIG. 3 is a schematic view of a non-flat formed glass, not drawn to scale.

DETAILED DESCRIPTION

[0176] FIG. 1 shows curves of spectral transmittance of different non-flat formed glasses for a thickness of 1 mm according to different embodiments.

[0177] Transmittance curve 1 was obtained for a non-flat formed glass with a composition corresponding to glass 5 from TABLE 1.

[0178] Transmittance curve 2 was obtained for a non-flat formed glass with a composition corresponding to glass 4 from TABLE 1.

[0179] Transmittance curve 3 was obtained for a non-flat formed glass with a composition corresponding to glass 8 from TABLE 1.

[0180] Transmittance curve 4 was obtained for a non-flat formed glass with a composition corresponding to glass 3 from TABLE 1.

[0181] Transmittance curve 5 was obtained for a non-flat formed glass with a composition corresponding to glass 2 from TABLE 1.

[0182] FIG. 2 shows a further transmittance spectrum of a non-flat formed glass for a thickness of 1 mm according to one embodiment in comparison to transmittance spectra that were obtained for selected comparative glasses, again for a thickness of 1 mm. Here, the wavelength range from 200 nm to 800 nm is considered.

[0183] Transmittance curve 6 was obtained for a non-flat formed glass with a composition corresponding to glass 8 from TABLE 1.

[0184] Transmittance curve 7 was obtained for a glass of 1 mm thickness with a composition corresponding to glass B from TABLE 2.

[0185] Transmittance curve 8 was obtained for a glass of 1 mm thickness with a composition corresponding to glass F from TABLE 2.

[0186] Transmittance curve 9 was obtained for a glass of 1 mm thickness with a composition corresponding to glass D from TABLE 2.

[0187] Transmittance curve 10 was obtained for a glass of 1 mm thickness with a composition corresponding to glass I from TABLE 2.

[0188] Transmittance curve 11 was obtained for a glass of 1 mm thickness with a composition corresponding to glass E from TABLE 2.

[0189] It can clearly be seen that the non-flat formed glass according to an embodiment of the invention exhibits increased transmittance within the entire illustrated wavelength range, in comparison to the prior art glasses.

[0190] FIG. 3 is a schematic view of a non-flat formed glass 100, here in the form of a tube, not drawn to scale. The non-flat formed glass 100 comprises two surfaces 101 and 102. In the context of the present invention, the two principal surfaces of the glass body are referred to as the surfaces 101, 102 of the non-flat formed glass 100, i.e. those surfaces which account for more than 50 percent of the total surface area of the glass body of the non-flat formed glass. Here, these are the inner surface (102) and the outer surface (101) of the non-flat formed glass 100.

[0191] The non-flat formed glass 100 exhibits transmittance for electromagnetic radiation, in particular in the wavelength range from 200 nm to 1500 nm, and at a thickness of the non-flat formed glass of 1 mm the non-flat formed glass exhibits a transmittance to electromagnetic radiation which is 20% or more, preferably 60% or more, more preferably 85% or more, and most preferably 88% or more at a wavelength of 254 nm; and/or which preferably is 82% or more, preferably 90% or more, more preferably 91% or more at a wavelength of 300 nm; and/or which preferably is 90% or more, preferably 91% or more at a wavelength of 350 nm; and/or which preferably is 92% or more, preferably 92.5% or more at a wavelength of 546 nm; and/or which preferably is 92.5% or more, preferably 93% or more at a wavelength of 1400 nm; and/or which is 91.5% or more, preferably 92% or more in a wavelength range from 380 nm to 780 nm; and/or which preferably is 92.5% or more, preferably 93% or more in a wavelength range from 780 nm to 1500 nm.

[0192] According to a preferred embodiment, the non-flat formed glass 100 comprises a content of oxides of network formers, in particular of oxides of silicon and/or boron, of not more than 98 mol % in total.

[0193] Preferably, the non-flat formed glass 100 has a coefficient of linear thermal expansion a between 2.4*10.sup.−6/K and 3.5*10.sup.−6/K.

[0194] According to one embodiment, the non-flat formed glass 100 has a content of SiO.sub.2 of at least 68 mol %, preferably between 68 mol % and 85 mol %, more preferably between 72 mol % and 85 mol %, most preferably between 76 mol % and 85 mol %.

[0195] According to a further embodiment, the non-flat formed glass 100 comprises B.sub.2O.sub.3, wherein preferably the content of B.sub.2O.sub.3 in the non-flat formed glass is between 10 mol % and 25 mol %, most preferably between 10 mol % and 22 mol %.

[0196] The non-flat formed glass 100 preferably comprises SiO.sub.2 and B.sub.2O.sub.3, wherein preferably Σ(SiO.sub.2+B.sub.2O.sub.3) is 87 mol % to 98 mol %, preferably 92 mol % to 98 mol %.

[0197] According to another embodiment of the non-flat formed glass 100, R.sub.2O is between 1 mol % and 6 mol %, preferably 1 mol % to 5 mol %, wherein R.sub.2O stands for alkali metal oxides.

[0198] With regard to the ratio of molar amounts of the components of the non-flat formed glass 100, preferably the following applies:

[0199] B.sub.2O.sub.3/SiO.sub.2 0.12 to 0.35; and/or

[0200] Σ(Me.sub.xO.sub.y)/(Σ(SiO.sub.2+B.sub.2O.sub.3) 0.02 to 0.10;

[0201] wherein Me represents a metal which usually has the oxidation number y in oxides, in particular one of an alkali metal and/or alkaline earth metal, and aluminum.

[0202] According to yet another embodiment of the non-flat formed glass 100, the following applies to the ratio of weight fractions of the iron ions contained in the non-flat formed glass:

[0203] 0.1≤Fe.sup.2+/(Fe.sup.2++Fe.sup.3+)≤0.3.

[0204] In accordance with yet another embodiment of the non-flat formed glass 100, the following applies to the metals Fe, Co, Ni, Cr, Cu, Mn, V contained in the non-flat formed glass 100 with regard to the weight fractions thereof, in ppm: Σ(1*Fe+300*Co+70*Ni+50*Cr+20*Cu+5*Mn+2*V) [ppm by mass] is less than 200 ppm, preferably less than 150 ppm, more preferably less than 100 ppm, yet more preferably less than 50 ppm, and most preferably less than 25 ppm; wherein the total content of the considered metals in the non-flat formed glass 100 is considered irrespective of their oxidation state.

[0205] Preferably, the transformation temperature T.sub.g of the non-flat formed glass 100 is between 450° C. and 550° C.

[0206] According to one embodiment of the non-flat formed glass 100, it has a viscosity η and Ig η has a value of 4 at temperatures between 1000° C. and 1320° C.

[0207] According to yet another embodiment of the non-flat formed glass 100, the refractive index n.sub.d of the non-flat formed glass 100 at a light wavelength of 587.6 nm is less than 1.479, preferably less than 1.475.

[0208] The non-flat formed glass 100 is preferably distinguished by values of chemical resistance against water according to DIN ISO 719 class HGB 1; against acids according to DIN 12116 class S 1 W; and against alkalis according to DIN ISO 695 class A3 or better.

[0209] According to another embodiment, the formed glass 100 comprises the following constituents:

[0210] SiO.sub.2 68 mol % to 85 mol %, preferably 72 mol % to 85 mol %, most preferably 76 mol % to 85 mol %,

[0211] B.sub.2O.sub.3 10 mol % to 25 mol %, preferably 10 mol % to 22 mol %,

[0212] Al.sub.2O.sub.30.2 mol % to 3.5 mol %, preferably 0.2 mol % to 2.5 mol %,

[0213] Na.sub.2O 0.5 mol % to 5.0 mol %,

[0214] K.sub.2O 0 mol % to 1.5 mol %, preferably 0 mol % to 1.0 mol %,

[0215] Li.sub.2O 0 mol % to 2.5 mol %, preferably 0 mol % to 1.5 mol %,

[0216] wherein, preferably, the alkali metal oxides Na.sub.2O, K.sub.2O, Li.sub.2O contained in the non-flat formed glass 100, preferably all alkali metal oxides contained in the non-flat formed glass 100, amount to less than 6 mol % and preferably less than 5 mol % in total.

[0217] According to one embodiment, the non-flat formed glass 100 is produced or producible by a melting process with subsequent hot forming, in particular in a drawing process, for example a tube drawing process such as a Danner process or a Vello process.