# US 11,440,836 B2 · Glass composition

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- Number: US 11,440,836 B2
- Document ID: US11440836B2
- Status: Granted
- Kind: B2
- Application number: 17/050,571
- Filed: 2019-04-10
- Published: 2021-08-05
- Granted: 2022-09-13
- Earliest claimed: 2018-04-25
- Assignees: Cdgm Glass Co., Ltd
- Applicants: Cdgm Glass Co., Ltd
- Inventors: Lulu Mao; Wei Sun; Bo Kuang
- Web page: https://patentgrep.com/patent/US11440836B2

## CPC

- C03C 3/095: containing rare earths
- C03C 3/091: containing aluminium
- C03C 8/02: Frit compositions, i.e. in a powdered or comminuted form
- C03C 8/04: containing zinc
- G11B 5/73921: {Glass or ceramic substrates}
- H10W 74/43: comprising oxides, nitrides or carbides, e.g. ceramics or glasses
- 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 low density. The glass composition includes the following components by mole percentage: 52-70% of SiO2, 5-10% of B2O3, 5-15% of Al2O3, 8-20% of CaO and 5-18% of MgO. The glass composition uses common chemical raw materials. By reasonably designing the contents of each component, the glass composition has high Young's modulus, low density, good heat resistance and chemical stability, relatively low high-temperature viscosity, and low raw material cost. The glass composition is easy to eliminate stripes and bubbles during manufacturing, and is suitable for hard disk substrate manufacturing other fields that need high Young's modulus materials.

## Claims

### Claim 1

A glass composition, comprising the following components by mole percentage: 52-70% of SiO2, 5-10% of B2O3, 5-12% of Al2O3, 8-20% of CaO and 5-18% of MgO; wherein CaO/MgO: 0.9-2.0, and (CaO+MgO)/Al2O3: 2.5-6.0.

### Claim 2 (depends on 1)

The glass composition according to claim 1, further comprising: 0-5% of SrO, 0-5% of BaO, 0-5% of ZnO, 0-3% of La2O3, 0-5% of Y2O3, 0-10% of TiO2, 0-5% of ZrO2, 0-2% of Sb2O3, 0-2% of CeO2, and 0-2% of SnO2.

### Claim 3

A glass composition, consisting of the following components by mole percentage: 52-70% of SiO2, 5-10% of B2O3, 5-12% of Al2O3, 8-20% of CaO, 5-18% of MgO, 0-5% of SrO, 0-5% of BaO, 0-5% of ZnO, 0-3% of La2O3, 0-5% of Y2O3, 0-10% of TiO2, 0-5% of ZrO2, 0-2% of Sb2O3, 0-2% of CeO2 and 0-2% of SnO2; wherein CaO/MgO: 0.9-2.0, and (CaO+MgO)/Al2O3: 2.5-6.0.

### Claim 4

A glass composition, comprising the following components by mole percentage: 52-70% of SiO2, 5-10% of B2O3, 5-12% of Al2O3, 8-20% of CaO and 5-18% of MgO, wherein Young's modulus of the glass is above 80 GPa, the density is below 3.10 g/cm3, CaO/MgO: 0.9-2.0, and (CaO+MgO)/Al2O3: 2.5-6.0.

### Claim 5 (depends on 4)

The glass composition according to claim 4, comprising the following components by mole percentage: 52-70% of SiO2, 5-10% of B2O3, 5-12% of Al2O3, 8-20% of CaO, 5-18% of MgO, 0-5% of SrO, 0-5% of BaO, 0-5% of ZnO, 0-3% of La2O3, 0-5% of Y2O3, 0-10% of TiO2, 0-5% of ZrO2, 0-2% of Sb2O3, 0-2% of CeO2, 0-2% of SnO2 and not more than 10% of R2O, wherein R2O is the total value of Na2O, K2O and Li2O.

### Claim 6 (depends on 1)

The glass composition according to claim 1, comprising 53-65% of SiO2, and/or 5-8% of B2O3, and/or 7-12% of Al2O3, and/or 10-18% of CaO, and/or 7-16% of MgO, and/or 0-3% of SrO, and/or 0-3% of BaO, and/or 0-2% of ZnO, and/or 0-1% of La2O3, and/or 0.2-3% of Y2O3, and/or 0-5% of TiO2, and/or 0-2% of ZrO2, and/or 0-1% of Sb2O3, and/or 0-1% of CeO2, and/or 0-1% 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 4 conditions:
(1) SiO2+Al2O3: 60-75%;
(2) Al2O3/SiO2: 0.05-0.30;
(3) Al2O3/B2O3: 0.5-2.5;
(4) (CaO+MgO+BaO+SrO)/SiO2: 0.2-0.7.

### Claim 8 (depends on 1)

The glass composition according to claim 1, comprising 54-62% of SiO2, and/or 5-7% of B2O3, and/or 8-12% of Al2O3, and/or 12-17% of CaO, and/or 8-15% of MgO, and/or 0-1% of BaO, and/or 0.3-1% of Y2O3, and/or 0-2% of TiO2, and/or 0-0.5% of Sb2O3, and/or 0-0.5% of CeO2, and/or 0-0.5% of SnO2.

### Claim 9 (depends on 1)

The glass composition according to claim 1, wherein the content of each component satisfies one or more of the following 6 conditions:
(1) SiO2+Al2O3: 62-73%;
(2) Al2O3/SiO2: 0.10-0.25;
(3) Al2O3/B2O3: 0.8-1.8;
(4) CaO/MgO: 1.0-2.0;
(5) (CaO+MgO+BaO+SrO)/SiO2: 0.3-0.6;
(6) (CaO+MgO)/Al2O3: 2.5-5.5.

### Claim 10 (depends on 1)

The glass composition according to claim 1, wherein the content of each component satisfies one or more of the following 6 conditions:
(1) SiO2+Al2O3: 64-70%;
(2) Al2O3/SiO2: 0.15-0.20;
(3) Al2O3/B2O3: 1.0-1.6;
(4) CaO/MgO: 1.1-2.0;
(5) (CaO+MgO+BaO+SrO)/SiO2: 0.4-0.6;
(6) (CaO+MgO)/Al2O3: 2.5-5.0.

### Claim 11 (depends on 1)

The glass composition according to claim 1, comprising not more than 10% of R2O, wherein R2O is the total value of Na2O, K2O and Li2O.

### Claim 12 (depends on 1)

The glass composition according to claim 1, comprising not more than 1% of R2O, wherein R2O is the total value of Na2O, K2O and Li2O.

### Claim 13 (depends on 1)

The glass composition according to claim 1, wherein the Young's modulus of the glass is 80-100 GPa; the density is below 2.80 g/cm3.

### Claim 14 (depends on 1)

The glass composition according to claim 1, wherein the Young's modulus of the glass is 84-100 GPa; the density is below 2.65 g/cm3.

### Claim 15 (depends on 1)

The glass composition according to claim 1, wherein water durability of the glass is Class 2 and above; acid durability is Class 2 and above.

### Claim 16 (depends on 1)

The glass composition according to claim 1, wherein water durability of the glass is Class 1; acid durability is Class 1.

### Claim 17 (depends on 1)

The glass composition according to claim 1, wherein the transition temperature of the glass is above 670° C.; the viscosity of the glass at a molten state of 1400° C. is below 400P.

### Claim 18 (depends on 1)

The glass composition according to claim 1, wherein the transition temperature of the glass is above 680° C.; the viscosity of the glass at a molten state of 1400° C. is below 300P.

### Claim 19 (depends on 1)

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

### Claim 20 (depends on 1)

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