# US 11,440,835 B2 · Glass composition

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- Number: US 11,440,835 B2
- Document ID: US11440835B2
- Status: Granted
- Kind: B2
- Application number: 16/759,766
- Filed: 2018-11-19
- Published: 2021-06-17
- Granted: 2022-09-13
- Earliest claimed: 2017-12-15
- Assignees: Cdgm Glass Co., Ltd
- Applicants: Cdgm Glass Co., Ltd
- Inventors: Lulu Mao; Bo Kuang; Xiaochun Li; Wei Sun; Zhenyu Liu; Liangzhen Hao
- Web page: https://patentgrep.com/patent/US11440835B2

## CPC

- C03C 3/087: containing calcium oxide, e.g. common sheet or container glass
- C03C 3/068: containing rare earths
- C03C 3/095: containing rare earths
- C03C 8/24: Fusion seal compositions being frit compositions having non-frit additions, i.e. for use as seals between dissimilar materials, e.g. glass and metal; Glass solders
- G11B 5/73921: {Glass or ceramic substrates}
- H10W 74/43: comprising oxides, nitrides or carbides, e.g. ceramics or glasses
- H10W 76/60: Seals
- 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
- G11B: INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER (recording measured values in a way that does not require playback through a transducer G01D9/00; recording or playback apparatus using mechanically marked tape, e.g. punched paper tape, or using unit records, e.g. punched or magnetically marked cards G06K; transferring data from one type of record carrier to another G06K1/18; circuits for coupling output of reproducer to radio receiver H04B1/20; gramophone pick-ups or like acoustic electromechanical transducers or circuits therefor H04R)
- H10W: GENERIC PACKAGES, INTERCONNECTIONS, CONNECTORS OR OTHER CONSTRUCTIONAL DETAILS OF DEVICES COVERED BY CLASS H10

## Abstract

A glass composition with high Young's modulus and specific modulus, wherein the glass composition includes the following components by weight percentage: 30-46% of SiO2, 0-6% of B2O3, 10-30% of Al2O3, 4-20% of CaO, 2-15% of MgO, and 13-32% of Y2O3. The glass composition uses common chemical raw materials. By reasonably arranging the contents of each component, the glass is good in heat resistance, chemical stability and press-molding devitrification resistance performance, low in high-temperature viscosity, convenient in bubble elimination, with specific modulus above 34 and Young's modulus above 100 GPa, and is suitable for hard disk substrate manufacturing, semiconductor sealing and other fields.

## Claims

### Claim 1

A glass composition, comprising the following components by weight percentage: 30-46% of SiO2, 0.5-6% of B2O3, 10-30% of Al2O3, 4-20% of CaO, 2-15% of MgO, and 13-32% of Y2O3,
wherein the weight percentage of Al2O3 and the weight percentage of B2O3 satisfy a ratio of Al2O3/B2O3 in a range of 4-36.

### Claim 2 (depends on 1)

The glass composition according to claim 1, also comprising the following components by weight percentage: 0-7% of TiO2, 0-5% of ZrO2, 0-5% of SrO, 0-5% of BaO, 0-5% of ZnO, 0-15% of La2O3, 0-2% of Sb2O3, 0-2% of CeO2, and 0-2% of SnO2.

### Claim 3 (depends on 1)

The glass composition according to claim 1, wherein the content of each component satisfies one or more of the following conditions by weight percentage:
(1) (SiO2+Al2O3)/B2O3 is 10-80;
(2) Al2O3/TiO2 is 3-41;
(3) CaO+MgO is not more than 21%;
(4) CaO/MgO is 0.8-8.0;
(5) (CaO+MgO)/Y2O3 is 0.2-1.0;
(6) (CaO+MgO+Y2O3)/SiO2 is 0.5-1.5;
(7) La2O3/Y2O3 is not greater than 0.8.

### Claim 4 (depends on 1)

The glass composition according to claim 1, comprising 32-42% of SiO2, and/or 15-28% of Al2O3, and/or 5-15% of CaO, and/or 3-10% of MgO, and/or 15-30% of Y2O3, and/or 0.5-7% of TiO2, and/or 0-3% of ZrO2, and/or 0-3% of SrO, and/or 0-3% of BaO, and/or 0-3% of ZnO, and/or 0-9% of La2O3, and/or 0-1% of Sb2O3, and/or 0-1% of CeO2, and/or 0-1% of SnO2.

### Claim 5 (depends on 1)

The glass composition according to claim 1, wherein the content of each component satisfies one or more of the following 8 conditions by weight percentage:
(1) (SiO2+Al2O3)/B2O3 is 15-70;
(2) Al2O3/B2O3 is 6-30;
(3) Al2O3/TiO2 is 6-30;
(4) CaO+MgO is not more than 19%;
(5) CaO/MgO is 0.9-5.0;
(6) (CaO+MgO)/Y2O3 is 0.3-0.9;
(7) (CaO+MgO+Y2O3)/SiO2 is 0.7-1.4;
(8) La2O3/Y2O3 is not greater than 0.4.

### Claim 6 (depends on 1)

The glass composition according to claim 1, comprising 34-40% of SiO2, and/or 1-5% of B2O3, and/or 19-25% of Al2O3, and/or 6-10% of CaO, and/or 4-8% of MgO, and/or 18-26% of Y2O3, and/or 1-6% of TiO2, and/or 0-2% of ZrO2, and/or 0-2% of ZnO, and/or 0-5% of La2O3, and/or 0-0.5% of Sb2O3, and/or 0-0.5% of CeO2, and/or 0-0.5% of SnO2.

### Claim 7 (depends on 1)

The glass composition according to claim 1, wherein the content of each component satisfies one or more of the following 8 conditions by weight percentage:
(1) (SiO2+Al2O3)/B2O3 is 20-60;
(2) Al2O3/B2O3 is 8-20;
(3) Al2O3/TiO2 is 8-20;
(4) CaO+MgO is not more than 18%;
(5) CaO/MgO is 1-2.5;
(6) (CaO+MgO)/Y2O3 is 0.4-0.8;
(7) (CaO+MgO+Y2O3)/SiO2 is 0.8-1.3;
(8) La2O3/Y2O3 is not greater than 0.15.

### Claim 8 (depends on 1)

The glass composition according to claim 1, wherein the specific modulus of the glass is above 34; and the Young's modulus is 100-130 GPa.

### Claim 9 (depends on 1)

The glass composition according to claim 1, wherein Tg temperature of the glass is above 740° C.; and the devitrification resistance performance is Class B or above.

### Claim 10 (depends on 1)

The glass composition according to claim 1, wherein the viscosity of the glass is not more than 150 P at 1400° C.; and the degree of glass bubble is Grade A0 or above.

### Claim 11 (depends on 1)

A hard disk substrate, formed by the glass composition according to claim 1.

### Claim 12 (depends on 1)

A method for sealing a semiconductor comprising applying the glass composition according to claim 1 to a surface of the semiconductor.

### Claim 13

A glass composition, consisting of the following components by weight percentage: 30-46% of SiO2, 0.5-6% of B2O3, 10-30% of Al2O3, 4-20% of CaO, 2-15% of MgO, 13-32% of Y2O3, 0-7% of TiO2, 0-5% of ZrO2, 0-5% of SrO, 0-5% of BaO, 0-5% of ZnO, 0-15% of La2O3, 0-2% of Sb2O3, 0-2% of CeO2, and 0-2% of SnO2.