# US 2025/0368564 A1 · Crystallized glass and preparation method therefor

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- Number: US 2025/0368564 A1
- Document ID: US20250368564A1
- Status: Published application
- Kind: A1
- Application number: 19/017,806
- Filed: 2025-01-13
- Published: 2025-12-04
- Earliest claimed: 2024-05-30
- Inventors: Yamashita YUTAKA; Ke ZHANG; Xintao LI; Weifang ZHANG; Morita EIMITSU; Rong LIU
- Web page: https://patentgrep.com/patent/US20250368564A1

## CPC

- C03C 10/0027: {containing SiO2, Al2O3, Li2O as main constituents}
- C03C 3/097: containing phosphorus, niobium or tantalum
- C03C 10/0009: {containing silica as main constituent}
- C03B 32/02: Thermal crystallisation, e.g. for crystallising glass bodies into glass-ceramic articles {(C03B27/012 takes precedence)}
- C03C 21/002: {to perform ion-exchange between alkali ions (C03C21/005 takes precedence)}
- C03C 2204/00: Glasses, glazes or enamels with special properties
- 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

A crystallized glass having the following oxides in mass percentage: 60.0%-70.0% SiO2, 1.0%-5.0% P2O5, 0.1%-10.0% Al2O3, 3.1%-9.99% Li2CO3, 1.0%-3.0% K2CO3, 5.1%-12.0% Na2CO3, 1.0%-5.0% MgO, 0.01%-0.09% TiO2, 1.0%-10.0% ZrO2, 1.0%-2.0% SrO, 0.1%-0.9% La2O3, 0.1%-0.9% Y2O3, 1.0%-2.0% Nb2O5, 1.0%-2.0% Ta2O5, 0.1%-0.9% WO3, 0.1%-0.9% Gd2O3, 0.1%-0.9% Bi2O3, and 0.1%-0.9% TeO2. A preparation method for the crystalized glass is also provided.

## Claims

### Claim 1

A crystallized glass, comprising the following oxides in mass percentage:
60.0%-70.0% SiO2, 1.0%-5.0% P2O5, 0.1%-10.0% Al2O3, 3.1%-9.99% Li2CO3, 1.0%-3.0% K2CO3, 5.1%-12.0% Na2CO3, 1.0%-5.0% MgO, 0.01%-0.09% TiO2, 1.0%-10.0% ZrO2, 1.0%-2.0% SrO, 0.1%-0.9% La2O3, 0.1%-0.9% Y2O3, 1.0%-2.0% Nb2O5, 1.0%-2.0% Ta2O5, 0.1%-0.9% WO3, 0.1%-0.9% Gd2O3, 0.1%-0.9% Bi2O3, and 0.1%-0.9% TeO2.

### Claim 2 (depends on 1)

The crystallized glass of claim 1, wherein a predominant crystalline phase of the crystallized glass is a combination of cristobalite, lithium disilicate, and petalite.

### Claim 3 (depends on 2)

The crystallized glass of claim 2, wherein the predominant crystalline phase has a particle diameter of 1-100 nm, and a crystallinity of 30%-80%.

### Claim 4

A preparation method for a crystallized glass, comprising the following steps:
mixing raw materials evenly to obtain a mixture, melting the mixture to obtain a molten mixture, and then cooling the molten mixture to obtain a glass sheet, wherein the raw materials comprises the following oxides in mass percentage:
60.0%-70.0% SiO2, 1.0%-5.0% P2O5, 0.1%-10.0% Al2O3, 3.1%-9.99% Li2CO3, 1.0%-3.0% K2CO3, 5.1%-12.0% Na2CO3, 1.0%-5.0% MgO, 0.01%-0.09% TiO2, 1.0%-10.0% ZrO2, 1.0%-2.0% SrO, 0.1%-0.9% La2O3, 0.1%-0.9% Y2O3, 1.0%-2.0% Nb2O5, 1.0%-2.0% Ta2O5, 0.1%-0.9% WO3, 0.1%-0.9% Gd2O3, 0.1%-0.9% Bi2O3, and 0.1%-0.9% TeO2;
subjecting the glass sheet to thermal nucleation treatment and crystal growth treatment according to conventional prior art to obtain the crystallized glass.

### Claim 5 (depends on 4)

The preparation method of claim 4, wherein the mixing of the raw materials is carried out in a mixer for a period of 5-60 min; and the mixer rotates at a speed of 1.0-30 rpm; the melting of the mixture is carried out in a quartz crucible, a zircon crucible, or a platinum crucible at a melting temperature of 1500-1700° C. for a period of 2-72 h; and the melting temperature is reduced to 1000-1450° C. at a start of the cooling of the molten mixture, and then the molten mixture are poured into a mold and slowly cooled to produce the glass sheet.

### Claim 6 (depends on 4)

The preparation method of claim 4, wherein the thermal nucleation treatment is carried out at a temperature of 500-850° C. for a period of 30-4000 min; the crystal growth treatment is carried out at a temperature of 500-850° C. for a period of 30-1800 min.

### Claim 7 (depends on 4)

The preparation method of claim 4, also comprising a step of subjecting the crystallized glass to grinding and polishing; soaking the crystallized glass ground and polished in a saline solution containing potassium or sodium; forming a compressive stress layer on a surface of the crystallized glass having soaked in the saline solution by a thermal strengthening treatment or an ion implantation method.

### Claim 8 (depends on 7)

The preparation method of claim 7, wherein the soaking is carried out for a period of 1-720 min; the saline solution has a temperature of 350-550° C.; the saline solution is potassium nitrate or sodium nitrate.

### Claim 9 (depends on 7)

The preparation method of claim 7, wherein the thermal strengthening treatment is as follows: after heating the crystallized glass having soaked in the saline solution to 300-600° C., rapid cooling is carried out to form the compressive stress layer resulting from a temperature difference between the surface and an interior of the crystallized glass having soaked in the saline solution.

### Claim 10 (depends on 7)

The preparation method of claim 7, wherein the ion implantation method is as follows: the surface of the crystallized glass having soaked in the saline solution is impacted with ions, and the ions are then implanted into the surface of the crystallized glass having soaked in the saline solution to form the compressive stress layer.