BLUE REFLECTIVE GLASS SUBSTRATE AND METHOD FOR MANUFACTURING THE SAME

Abstract

A method for manufacturing blue reflective glass substrates by ion implantation, the method including ionizing a N.sub.2 source gas so as to form a mixture of single charge and multicharge ions of N, forming a beam of single charge and multicharge ions of N by accelerating with an acceleration voltage A between 15 kV and 35 kV and a dosage D between 9.3310.sup.15A/kV+3.8710.sup.17 ions/cm.sup.2 and 7.5010.sup.17 ions/cm.sup.2. A blue reflective glass substrate including an area treated by ion implantation with a mixture of simple charge and multicharge ions according to the method.

Claims

1. A method for producing a blue reflective glass substrate, the method comprising: a) providing a N.sub.2 source gas, b) ionizing the N.sub.2 source gas so as to form a mixture of single charge ions and multicharge ions of N, c) accelerating the mixture of single charge ions and multicharge ions with an acceleration voltage so as to form a beam of single charge ions and multicharge ions of N, wherein the acceleration voltage A is comprised between 15 kV and 35 kV and the dosage D is comprised between 9.3310.sup.15A/kV+3.8710.sup.17 ions/cm.sup.2 and 7.5010.sup.17 ions/cm.sup.2, d) providing a glass substrate, and e) positioning the glass substrate in the trajectory of the beam of single charge and multicharge ions of N.

2. The method for producing a blue reflective glass substrate according to claim 1, wherein the acceleration voltage A is comprised between 32 kV and 35 kV and the dosage D is comprised between 610.sup.17 ions/cm.sup.2 and 710.sup.17 ions/cm.sup.2.

3. The method for producing a blue reflective glass substrate according to claim 1 wherein the glass substrate comprises the following composition ranges expressed as weight percentage of the total weight of the glass: SiO.sub.2 35-85%, Al.sub.2O.sub.3 0-30%, P.sub.2O.sub.5 0-20%, B.sub.2O.sub.3 0-20%, Na.sub.2O 0-25%, CaO 0-20%, MgO 0-20%, K.sub.2O 0-20%, and BaO 0-20%.

4. The method for producing a blue reflective glass substrate according to claim 3, wherein the glass substrate is selected from the group consisting of a soda-lime glass sheet, a borosilicate glass sheet and an aluminosilicate glass sheet.

5. The method for producing a blue reflective glass substrate according to claim 4, wherein the glass substrate is a clear glass sheet.

6. A method, comprising employing a mixture of single charge and multicharge ions of N to increase the blue color of the reflectance of a glass substrate, the mixture of single charge and multicharge ions being implanted in the glass substrate with an ion dosage and acceleration voltage effective to increase the blue color of the reflectance of the glass substrate.

7. The method according to claim 6, the mixture of single charge and multicharge ions being implanted in the glass substrate with a dosage and acceleration voltage effective to increase the blue color of the reflectance to b* in reflectance to less than or equal to 3.

8. The method according to claim 7, the mixture of single charge and multicharge ions being implanted in the glass substrate with a dosage and acceleration voltage effective to increase the blue color of the reflectance to b* in reflectance to less than or equal to 3 while maintaining the color coordinate a* in reflectance comprised between 3 and 3.

9. The method according to claim 8, the mixture of single charge and multicharge ions being implanted in the glass substrate with an acceleration voltage A comprised between 15 kV and 35 kV and the dosage D is comprised between 9.3310.sup.15A/kV+3.8710.sup.17 ions/cm.sup.2 and 7.5010.sup.17 ions/cm.sup.2.

10. A blue reflective glass substrate produced by the method of claim 1.

11. A monolithic glazing, laminated glazing or multiple glazing with interposed gas layer, comprising a blue reflective glass substrate according to claim 10.

12. The glazing of claim 10, further comprising sun-shielding, heat-absorbing, anti-ultraviolet, antistatic, low-emissive, heating, anti-soiling, security, burglar proof, sound proofing, fire protection, anti-mist, water-repellant, anti-bacterial or mirror means.

13. The glazing of claim 11, wherein said antireflective glass substrate is frosted, printed or screen process printed.

14. The glazing of claim 11, wherein said substrate is tinted, tempered, reinforced, bent, folded or ultraviolet filtering.

15. The glazing of claim 11, comprising a laminated structure comprising a polymer type assembly sheet interposed between the antireflective glass substrate, with the ion implantation treated surface facing away from the polymer assembly sheet, and another glass substrate.

16. The glazing of claim 15, wherein said glazing is a car windshield.

Description

DETAILED DESCRIPTION OF PARTICULAR EMBODIMENTS

[0058] The ion implantation examples were prepared according to the various parameters detailed in the tables below using an RCE ion source for generating a beam of single charge and multicharge ions. The ion source used was a Hardion+ RCE ion source from Quertech Ingnierie S.A.

[0059] All samples had a size of 1010 cm.sup.2 and were treated on the entire surface by displacing the glass substrate through the ion beam at a speed between 20 and 30 mm/s.

[0060] The temperature of the area of the glass substrate being treated was kept at a temperature less than or equal to the glass transition temperature of the glass substrate.

[0061] For all examples the implantation was performed in a vacuum chamber at a pressure of 10.sup.6 mbar.

[0062] Ions of N were implanted in 4 mm regular clear soda-lime glass substrates. The parameters can be found the table 4 below.

TABLE-US-00005 TABLE 4 acceler- a* b* ation reflectance reflectance refer- Source glass voltage ion dosage [CIELAB, [CIELAB, ence gas substrate [kV] [ions/cm.sup.2] D65, 10] D65, 10] E1 N.sub.2 Sodalime 35 .sup.1 10.sup.17 1.12 5.16 E2 N.sub.2 Sodalime 25 2.5 10.sup.17 0.93 4.84 E3 N.sub.2 Sodalime 15 7.5 10.sup.17 1.95 5.04 E4 N.sub.2 Sodalime 25 7.5 10.sup.17 4.07 8.18 C1 Sodalime 0 0 0.53 0.56 C2 N2 Sodalime 20 .sup.6 10.sup.16 0.22 0.40 C3 N2 Sodalime 25 .sup.6 10.sup.16 0.14 0.57

[0063] As can be seen from examples E1 to E4 of the present invention, the chosen key parameters used for the ion implantation, where acceleration voltage A is comprised between 15 kV and 35 kV and the dosage D is comprised between 9.3310.sup.15A/kV+3.8710.sup.17 ions/cm.sup.2 and 7.5010.sup.17 ions/cm.sup.2, leads to an increased blue color of the reflectance of the glass substrate with b* being less than 3. An untreated sodalime glass sample C1 as well as other sodalime glass samples C2 and C3, treated with implantation parameters outside of the specific ranges of the present invention, do not provide the sought after blue color in reflectance.