Tube-drawable glass, method for the production and use

Patent metadata

Field	Value
Publication number	US-12252439-B2
Application number	US-202017127396-A
Country	US
Kind code	B2
Filing date	Dec 18, 2020
Priority date	Dec 20, 2019
Publication date	Mar 18, 2025
Grant date	Mar 18, 2025

Abstract

A glass has a maximum crystallization rate (KG max ) of at most 0.20 μm/min in a temperature range of 700° C. to 1250° C. and a hydrolytic stability according to a hydrolytic class 1 HGA1 according to ISO 720:1985. In the case of a sample thickness of 2 mm of the glass, a ratio of a minimum transmittance in a wavelength range of 850 nm to 950 nm to a maximum transmittance in a wavelength range of 250 nm to 700 nm is in a range of 1.9:1 to 15:1.

First claim

What is claimed is:

1. A glass, having a maximum crystallization rate (KG max ) of at most 0.20 μm/min in a temperature range of 700° C. to 1250° C. and a hydrolytic stability according to a hydrolytic class 1 HGA1 according to ISO 720:1985, wherein in the case of a sample thickness of 2 mm of the glass a ratio of a minimum transmittance in a wavelength range of 850 nm to 950 nm to a maximum transmittance in a wavelength range of 250 nm to 700 nm is in a range of 1.9:1 to 15:1, wherein the glass comprises cations of the following components in the given portions (in % by cation):

Component
Portion

silicon
40-80

boron
 0-20

aluminum
 0-25

sodium
 2-22

potassium
0.1-10 

chromium
0.05-0.5 

cobalt
0.03-0.5;

wherein a sum of the portions of the cations of sodium and potassium is in a range of 10 to 25% by cation, wherein a sum of the portions of the cations of chromium and cobalt is in a range of 0.15 to 0.55% by cation, and wherein a sum of the portions of the cations of magnesium, calcium, strontium, barium and zinc is at most 15% by cation, wherein a ratio of the sum of the portions of the cations of sodium and potassium to the sum of the portions of the cations of cobalt and chromium is in a range of 40:1 to 150:1.

2. The glass of claim 1 , wherein the glass comprises cations of the following components in the given portions (in % by cation):

Component
Portion

magnesium
0-5

calcium
 0-15

strontium
0-5

barium
0-5

zinc
 0-10

zirconium
 0-10

titanium
  0-10.

3. The glass of claim 1 , wherein the glass has a diffusivity D in a range of 5 to 50 μm 2 per hour.

4. The glass of claim 1 , wherein a transmittance in the whole wavelength range of 850 nm to 950 nm is at least 75%.

5. A glass article, comprising a glass and having a thickness in a range of 0.02 mm to 5 mm, the glass having a maximum crystallization rate (KG max ) of at most 0.20 inn/min in a temperature range of 700° C. to 1250° C. and a hydrolytic stability according to a hydrolytic class 1 HGA1 according to ISO 720:1985, wherein in the case of a sample thickness of 2 mm of the glass a ratio of a minimum transmittance in a wavelength range of 850 nm to 950 nm to a maximum transmittance in a wavelength range of 250 nm to 700 nm is in a range of 1.9:1 to 15:1, wherein the glass comprises cations of the following components in the given portions (in % by cation):

Component
Portion

silicon
40-80

boron
 0-20

aluminum
 0-25

sodium
 2-22

potassium
0.1-10 

chromium
0.05-0.5 

cobalt
0.03-0.5;

wherein a sum of the portions of the cations of sodium and potassium is in a range of 10 to 25% by cation, wherein a sum of the portions of the cations of chromium and cobalt is in a range of 0.15 to 0.55% by cation, and wherein a sum of the portions of the cations of magnesium, calcium, strontium, barium and zinc is at most 15% by cation, wherein a ratio of the sum of the portions of the cations of sodium and potassium to the sum of the portions of the cations of cobalt and chromium is in a range of 40:1 to 150:1.

6. The glass article of claim 5 , wherein the glass comprises cations of the following components in the given portions (in % by cation):

Component
Portion

magnesium
0-5

calcium
 0-15

strontium
0-5

barium
0-5

zinc
 0-10

zirconium
 0-10

titanium
  0-10.

Assignees

• Schott Ag

Inventors

• Grimm Malte
• Eichholz Rainer Erwin
• Biertümpfel Ralf

Classifications

• C03C4/02

  for coloured glass · CPC title

• C03C4/10 Primary

  for infrared transmitting glass · CPC title

• C03C3/091

  containing aluminium · CPC title

• C03C3/083

  containing aluminium oxide or an iron compound · CPC title

• G02B5/226

  Glass filters · CPC title