# US 2026/0092005 A1 · Alkali-free boron aluminosilicate glasses with high thermal stability and high crystallization margin and methods for preparing the same

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- Number: US 2026/0092005 A1
- Document ID: US20260092005A1
- Status: Published application
- Kind: A1
- Application number: 19/393,499
- Filed: 2025-11-18
- Published: 2026-04-02
- Earliest claimed: 2024-09-29
- Assignees: Caihong Display Devices Co., Ltd.
- Applicants: Caihong Display Devices Co., Ltd.
- Inventors: Jing LAN; Lihua XU; Zhao ZENG
- Web page: https://patentgrep.com/patent/US20260092005A1

## CPC

- C03C 3/091: containing aluminium
- C03C 3/087: containing calcium oxide, e.g. common sheet or container glass
- C03B 17/064: {by the overflow downdraw fusion process; Isopipes therefor}
- C03C: CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- C03B: MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES

## Abstract

The present disclosure relates to the technical field of electronic glass, and specifically relates to an alkali-free boron aluminosilicate glass with high thermal stability and high crystallization margin and a method for preparing the same. alkali-free boron aluminosilicate glass thermal stability In mole percentage, raw materials for preparing the alkali-free boron aluminosilicate glass with high thermal stability and high crystallization margin include: 68.54 to 72.82% SiO2, 11.84 to 13.5% Al2O3, ≤2.23% B2O3, 4.72 to 6.6% MgO, 4.65 to 5.8% CaO, 0.8 to 1.5% SrO, 3.2 to 3.79% BaO, and 0.1% SnO2, SiO2+Al2O3 is 81.63 to 84.66%, and (MgO+CaO+SrO+BaO)/Al2O3 is 1.15 to 1.30.

## Claims

### Claim 1

An alkali-free boron aluminosilicate glass with high thermal stability and high crystallization margin, wherein, in mole percentage, raw materials for preparing the alkali-free boron aluminosilicate glass with high thermal stability and high crystallization margin include: 68.54% to 72.82% SiO2, 11.84% to 13.5% Al2O3, ≤2.23% B2O3, 4.72% to 6.6% MgO, 4.65% to 5.8% CaO, 0.8% to 1.5% SrO, 3.2% to 3.79% BaO, and 0.1% SnO2, SiO2+Al2O3 is 81.63% to 84.66%, and (MgO+CaO+SrO+BaO)/Al2O3 is 1.15 to 1.30.

### Claim 2 (depends on 1)

The alkali-free boron aluminosilicate glass with high thermal stability and high crystallization margin according to claim 1, wherein, in mole percentage, the raw materials include: 69.12% to 72.82% SiO2, 11.84% to 13.1% Al2O3, ≤2.23% B2O3, 5.28% to 6.59% MgO, 4.65% to 5.78% CaO, 0.8% to 1.5% SrO, 3.2% to 3.79% BaO, and 0.1% SnO2, SiO2+Al2O3 is 81.63% to 84.66%, and (MgO+CaO+SrO+BaO)/Al2O3 is 1.15 to 1.30.

### Claim 3 (depends on 1)

The alkali-free boron aluminosilicate glass with high thermal stability and high crystallization margin according to claim 1, wherein, in mole percentage, the raw materials include: 69.33% to 72.82% SiO2, 11.84% to 13.1% Al2O3, ≤2.23% B2O3, 5.28% to 6.59% MgO, 4.65% to 5.52% CaO, 0.8% to 1.5% SrO, 3.2% to 3.79% BaO, and 0.1% SnO2, SiO2+Al2O3 is 81.63% to 84.66%, and (MgO+CaO+SrO+BaO)/Al2O3 is 1.15 to 1.30.

### Claim 4 (depends on 1)

The alkali-free boron aluminosilicate glass with high thermal stability and high crystallization margin according to claim 1, wherein, in mole percentage, the raw materials include: 70.5% to 72.82% SiO2, 11.84% to 13.1% Al2O3, ≤1.23% B2O3, 5.28% to 6.29% MgO, 4.99% to 5.01% CaO, 0.8% to 1.1% SrO, 3.54% to 3.79% BaO, and 0.1% SnO2, SiO2+Al2O3 is 83% to 84.66%, and (MgO+CaO+SrO+BaO)/Al2O3 is 1.15 to 1.29.

### Claim 5 (depends on 1)

The alkali-free boron aluminosilicate glass with high thermal stability and high crystallization margin according to claim 1, wherein, in mole percentage, the raw materials include: 72.82% SiO2, 11.84% Al2O3, 5.28% MgO, 5.32% CaO, 1.1% SrO, 3.54% BaO, and 0.1% SnO2, SiO2+Al2O3 is 84.66%, and (MgO+CaO+SrO+BaO)/Al2O3 is 1.29.

### Claim 6 (depends on 1)

The alkali-free boron aluminosilicate glass with high thermal stability and high crystallization margin according to claim 1, wherein a strain point temperature of the alkali-free boron aluminosilicate glass with high thermal stability and high crystallization margin is higher than 735° C.

### Claim 7 (depends on 1)

The alkali-free boron aluminosilicate glass with high thermal stability and high crystallization margin according to claim 1, wherein a liquidus viscosity of the alkali-free boron aluminosilicate glass with high thermal stability and high crystallization margin is higher than 203426 P, and a crystallization margin of the alkali-free boron aluminosilicate glass with high thermal stability and high crystallization margin is higher than 80° C.

### Claim 8 (depends on 1)

A method for preparing the alkali-free boron aluminosilicate glass with high thermal stability and high crystallization margin according to claim 1, comprising: mixing the raw materials, melting, and refining to obtain a refined glass melt; and forming the refined glass melt by an overflow downdraw process to obtain the alkali-free boron aluminosilicate glass with high thermal stability and high crystallization margin.

### Claim 9 (depends on 8)

The method according to claim 8, wherein a temperature of the melting is in a range of 1590° C. to 1630° C.

### Claim 10 (depends on 8)

The method according to claim 8, wherein a temperature of the forming is in a range of 1270° C. to 1300° C.