Method for producing a toughened glass article with a durable functional coating and a toughened glass article with a durable functional coating

Abstract

A method for producing a toughened glass article with a functional coating comprises providing a chemically toughened glass substrate with a first and a second face and a thickness (t) there between.The glass substrate has a surface layer with a compressive stress (CS) extending to a depth-of-layer (DoL) below the first and / or second face. The method further comprises applying a sol-gel coating to the first and / or the second face of said glass substrate and curing the sol-gel coating by heating it to curing temperatures above T a-200 DEG C during a curing time t c to produce the durable functional coating. The curing time t c satisfies formula (I) wherein T a is the temperature at the annealing point of the glass material of the glass substrate and T c is the maximum curing temperature, where T a and T c are given in DEG C. Further provided is a toughened glass article with a durable functional coating, in particular produced by the method according to the invention.

Description

technical field

[0001] The present invention relates to tempered glass or glass-ceramic articles having a durable functional coating, wherein the durable functional coating is a sol-gel coating, and a method for producing the same. Background technique

[0002] The market for consumer electronics, such as wearable devices, such as smartphones or tablets, requires glass articles with coated surfaces, such as cover glass for touch screens. Typical coatings are eg antireflective coatings (AR), antimicrobial coatings (AM), antiglare coatings (AG) and antifingerprint coatings (AF) and the like. Coatings need to have high wear resistance in order to withstand the mechanical stresses that occur in everyday use. Coated glass articles should therefore be very thin in order to minimize the volume and weight of the finished product. Such coated glass articles should also exhibit very high durability in everyday use and have the necessary strength and flexibility, eg for effective pro...

Examples

example 5

[0144] Examples 5 and 6 contain samples with a single / double-sided functional coating according to configuration A (A), wherein no additional layers are applied. As can be gleaned from Table 3 above, Example 5 has a medium DoL, while Example 6 has a large DoL. The residual compressive stress CS of Example 5 残余 is 96%, and the residual DoL 残余 is 104%, while the CS of Example 6 残余 then 100% and DoL 残余 96%.

[0145] Examples 7 to 8

[0146]

example 7

[0148] Examples 7 and 8 contain samples prepared with a single layer of functional coating for comparison. A sample of Example 7 was prepared with a single silicate layer functional coating, while a sample of Example 8 was prepared with a single titania layer functional coating. As learned from the table above, the residual CS 残余 and DoL 残余 Similar values ​​are obtained with multilayer coatings according to configuration A (A).

example 9

[0150] Example 9 contains a sample with a single-sided functional coating according to configuration A, wherein no additional layers were applied. Table 5 below shows comparative values ​​of DoL and CS before and after curing the sol-gel coating on the coated and uncoated sides.

[0151]

[0152] Table 5: Single side coated glass samples of Example 9

[0153] The samples of Example 9 clearly show that the change in tempering parameters is not substantially affected by the presence of a coating on one side.

technical field

[0001] The present invention relates to tempered glass or glass-ceramic articles having a durable functional coating, wherein the durable functional coating is a sol-gel coating, and a method for producing the same. Background technique

[0002] The market for consumer electronics, such as wearable devices, such as smartphones or tablets, requires glass articles with coated surfaces, such as cover glass for touch screens. Typical coatings are eg antireflective coatings (AR), antimicrobial coatings (AM), antiglare coatings (AG) and antifingerprint coatings (AF) and the like. Coatings need to have high wear resistance in order to withstand the mechanical stresses that occur in everyday use. Coated glass articles should therefore be very thin in order to minimize the volume and weight of the finished product. Such coated glass articles should also exhibit very high durability in everyday use and have the necessary strength and flexibility, eg for effective pro...

Examples

example 5

[0144] Examples 5 and 6 contain samples with a single / double-sided functional coating according to configuration A (A), wherein no additional layers are applied. As can be gleaned from Table 3 above, Example 5 has a medium DoL, while Example 6 has a large DoL. The residual compressive stress CS of Example 5 残余 is 96%, and the residual DoL 残余 is 104%, while the CS of Example 6 残余 then 100% and DoL 残余 96%.

[0145] Examples 7 to 8

[0146]

example 7

[0148] Examples 7 and 8 contain samples prepared with a single layer of functional coating for comparison. A sample of Example 7 was prepared with a single silicate layer functional coating, while a sample of Example 8 was prepared with a single titania layer functional coating. As learned from the table above, the residual CS 残余 and DoL 残余 Similar values ​​are obtained with multilayer coatings according to configuration A (A).

example 9

[0150] Example 9 contains a sample with a single-sided functional coating according to configuration A, wherein no additional layers were applied. Table 5 below shows comparative values ​​of DoL and CS before and after curing the sol-gel coating on the coated and uncoated sides.

[0151]

[0152] Table 5: Single side coated glass samples of Example 9

[0153] The samples of Example 9 clearly show that the change in tempering parameters is not substantially affected by the presence of a coating on one side.

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