Glass material

Abstract

To provide a glass material that can achieve high strength without the application of reinforcing process.SOLUTION: A glass material contains, in mol%, more than 15% and up to 50% of R2O3 and more than 0% and up to 80% of SiO2+B2O3+P2O5+Al2O3, R2O3 being at least one selected from Sc2O3, Y2O3 and La2O3.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a glass material. [Background technology]

[0002] In recent years, mobile terminals, digital cameras, and touch panel displays have become increasingly popular. Glass substrates used in these applications are required to be resistant to damage caused by impacts and scratches.

[0003] Conventionally, so-called tempered glass substrates have been used for these applications (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2004-359504 Summary of the Invention [Problem to be solved by the invention]

[0005] The manufacture of tempered glass substrates requires a tempering process, such as ion exchange, to strengthen the glass, which increases the manufacturing cost of the glass.

[0006] In view of the above, an object of the present invention is to provide a glass material that can achieve high strength without undergoing a tempering process. [Means for solving the problem]

[0007] The glass material of the present invention is characterized in that it contains, in mole percent, more than 15% to 50% R2O3 and more than 0% to 80% SiO2 + B2O3 + P2O5 + Al2O3, and the R2O3 is at least one selected from Sc2O3, Y2O3, and La2O3.

[0008] In the glass material of the present invention, R2O3 preferably contains at least Sc2O3.

[0009] The glass material of the present invention preferably contains, in mol %, 30% to 50% of R2O3.

[0010] The glass material of the present invention preferably contains, in mole percent, more than 20% and up to 80% of SiO.

[0011] The glass material of the present invention preferably contains, in mole percent, 30% to 80% B2O, 50% to 80% P2O, and 30% to 80% Al2O.

[0012] The glass material of the present invention preferably contains, in mole percent, more than 55% and up to 80% of SiO2+B2O3+P2O5+Al2O3.

[0013] The glass material of the present invention preferably has a Vickers hardness of 5.0 GPa or more.

[0014] The glass material of the present invention preferably has a Young's modulus of 80 GPa or more. [Effects of the Invention]

[0015] According to the present invention, it is possible to provide a glass material that can achieve high strength without undergoing a tempering process. [Brief explanation of the drawings]

[0016] [Figure 1] 1 is a schematic cross-sectional view showing one embodiment of an apparatus for producing a glass material of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0017] The glass material of the present invention is characterized by containing, in mole percent, more than 15% to 50% R2O3 and more than 0% to 80% SiO2 + B2O3 + P2O5 + Al2O3, where R2O3 is at least one selected from Sc2O3, Y2O3, and La2O3. The reasons for specifying the glass composition in this way and the content of each component are explained below. In the following explanation, "%" means "mol %" unless otherwise specified.

[0018] R2O3 is at least one selected from Sc2O3, Y2O3, and La2O3, and is a component that improves the Vickers hardness and Young's modulus of the glass. The R2O3 content (total amount of Sc2O3, Y2O3, and La2O3) is more than 15% to 50%, and is preferably 16% to 50%, 17% to 50%, 20% to 50%, 25% to 50%, 30% to 50%, 30% to 49%, 30% to 48%, and particularly preferably 30% to 45%. If the R2O3 content is too high, vitrification becomes difficult. If the R2O3 content is too low, the Vickers hardness and Young's modulus tend to decrease. The contents of each component are as follows:

[0019] The Sc2O3 content is preferably 0% to 50%, more than 0% to 50%, 1% to 50%, 2% to 50%, 5% to 50%, 10% to 50%, more than 15% to 50%, 16% to 50%, 17% to 50%, 20% to 50%, 25% to 50%, 30% to 50%, 30% to 49%, 30% to 48%, and particularly preferably 30% to 45%.

[0020] The Y2O3 content is preferably 0% to 50%, more than 0% to 50%, 1% to 50%, 2% to 50%, 5% to 50%, 10% to 50%, more than 15% to 50%, 16% to 50%, 17% to 50%, 20% to 50%, 25% to 50%, 30% to 50%, 30% to 49%, 30% to 48%, and particularly preferably 30% to 45%.

[0021] The La2O3 content is preferably 0% to 50%, more than 0% to 50%, 1% to 50%, 2% to 50%, 5% to 50%, 10% to 50%, more than 15% to 50%, 16% to 50%, 17% to 50%, 20% to 50%, 25% to 50%, 30% to 50%, 30% to 49%, 30% to 48%, and particularly preferably 30% to 45%.

[0022] It is preferable that R2O3 contains at least Sc2O3. This makes it easier to further increase the Vickers hardness and Young's modulus of the glass material. Furthermore, from the viewpoint of improving the ease of vitrification, it is preferable that Y2O3 and / or La2O3 be contained. Note that two or more selected from Sc2O3, Y2O3, and La2O3 may be contained.

[0023] SiO2, B2O3, P2O5, and Al2O3 are components that form the glass skeleton. The content of SiO2 + B2O3 + P2O5 + Al2O3 (the total amount of SiO2, B2O3, P2O5, and Al2O3) is greater than 0% to 80%, and is preferably 1% to 80%, 2% to 80%, 5% to 80%, 10% to 80%, 20% to 80%, 30% to 80%, 40% to 80%, 45% to 80%, 50% to 80%, 55% to 80%, greater than 55% to 80%, greater than 55% to 79%, greater than 55% to 78%, or greater than 55% to 77%, and particularly preferably greater than 55% to 75%. If the content of SiO2 + B2O3 + P2O5 + Al2O3 is too low, vitrification becomes difficult. If the content of SiO2 + B2O3 + P2O5 + Al2O3 is too high, the Vickers hardness and Young's modulus tend to decrease. The content of each component is as follows:

[0024] The SiO2 content is preferably 0% to 80%, more than 0% to 80%, 1% to 80%, 2% to 80%, 5% to 80%, 10% to 80%, 20% to 80%, 30% to 80%, 40% to 80%, 45% to 80%, 50% to 80%, 55% to 80%, more than 55% to 80%, more than 55% to 79%, more than 55% to 78%, more than 55% to 77%, and particularly preferably more than 55% to 75%.

[0025] The B2O3 content is preferably 0% to 80%, more than 0% to 80%, 1% to 80%, 2% to 80%, 5% to 80%, 10% to 80%, 20% to 80%, 30% to 80%, 40% to 80%, 45% to 80%, 50% to 80%, 55% to 80%, more than 55% to 80%, more than 55% to 79%, more than 55% to 78%, more than 55% to 77%, and particularly preferably more than 55% to 75%.

[0026] The P2O5 content is preferably 0% to 80%, more than 0% to 80%, 1% to 80%, 2% to 80%, 5% to 80%, 10% to 80%, 20% to 80%, 30% to 80%, 40% to 80%, 45% to 80%, 50% to 80%, 55% to 80%, more than 55% to 80%, more than 55% to 79%, more than 55% to 78%, more than 55% to 77%, and particularly preferably more than 55% to 75%.

[0027] The Al2O3 content is preferably 0% to 80%, more than 0% to 80%, 1% to 80%, 2% to 80%, 5% to 80%, 10% to 80%, 20% to 80%, 30% to 80%, 40% to 80%, 45% to 80%, 50% to 80%, 55% to 80%, more than 55% to 80%, more than 55% to 79%, more than 55% to 78%, more than 55% to 77%, and particularly preferably more than 55% to 75%.

[0028] Of SiO2, B2O3, P2O5, and Al2O3, it is preferable to contain at least SiO2 or B2O3, and it is more preferable to contain at least SiO2.

[0029] The content of R2O3+SiO2+B2O3+P2O5+Al2O3 (total amount of R2O3, SiO2, B2O3, P2O5, and Al2O3) is preferably 80% or more, 90% or more, 95% or more, or 98% or more, particularly preferably 99% or more. The upper limit may be 100%.

[0030] The glass material of the present invention has the above composition, thereby achieving high Vickers hardness and high Young's modulus. Specifically, the Vickers hardness is preferably 5.0 GPa or more, 5.5 GPa or more, 6.0 GPa or more, 6.2 GPa or more, and particularly preferably 6.5 GPa or more. The Young's modulus is preferably 80 GPa or more, 90 GPa or more, 100 GPa or more, 110 GPa or more, and particularly preferably 120 GPa or more.

[0031] The glass material of the present invention can be produced, for example, by a containerless levitation method. Fig. 1 is a schematic cross-sectional view showing one embodiment of an apparatus for producing the glass material of the present invention. The method for producing the glass material of the present invention will be described below with reference to Fig. 1.

[0032] The glass material manufacturing apparatus 1 has a molding die 10. The molding die 10 has a molding surface 10a and a plurality of gas outlet holes 10b opening into the molding surface 10a. The gas outlet holes 10b are connected to a gas supply mechanism 11 such as a gas cylinder. Gas is supplied from the gas supply mechanism 11 to the molding surface 10a via the gas outlet holes 10b. The type of gas is not particularly limited, and may be, for example, air or oxygen, or may be a reducing gas containing nitrogen gas, argon gas, helium gas, carbon monoxide gas, carbon dioxide gas, or hydrogen.

[0033] First, raw material ingot 12 is placed on molding surface 10a. Examples of raw material ingot 12 include raw material powders integrated by press molding or the like, a sintered body obtained by integrating raw material powders by press molding or the like and then sintering, and an aggregate of crystals having a composition equivalent to the target glass composition.

[0034] Next, gas is ejected from the gas ejection holes 10b to levitate the raw material lump 12 above the forming surface 10a. That is, the raw material lump 12 is held in a state where it is not in contact with the forming surface 10a. In this state, laser light is irradiated onto the raw material lump 12 from the laser light irradiation device 13. This heats and melts the raw material lump 12, vitrifying it to obtain molten glass. The molten glass is then cooled to obtain a glass material. During the process of heating and melting the raw material lump 12 and the process of cooling the molten glass and further the glass material until their temperatures are at least below their softening points, it is preferable to continue ejecting gas at least to prevent contact between the raw material lump 12, the molten glass, and further the glass material and the forming surface 10a. Note that the method of heating and melting the raw material lump 12 may be radiation heating in addition to laser light irradiation. Note that the glass material may be processed into a desired shape by cutting, polishing, pressing, etc., as necessary. [Example]

[0035] The present invention will be described below based on examples, but the present invention is not limited to these examples.

[0036] Table 1 shows Examples 1 to 5 of the present invention and Comparative Example 6.

[0037] [Table 1]

[0038] Each sample was prepared as follows: First, raw materials were mixed to prepare a raw material batch having the glass composition shown in Table 1. The raw material batch was sintered by heat treatment at a temperature of 1050°C to obtain a glass raw material lump.

[0039] Next, glass material (approximately 2 mm in diameter) was produced by the containerless levitation method using an apparatus similar to that shown in Figure 1. A 100 W CO2 laser oscillator was used as the heat source. O2 gas was used to levitate the glass raw material mass in the air, and the supply flow rate was set to 0.1 L / min to 30 L / min. The obtained glass material was annealed in air near the glass transition point for 1 hour, and then the following measurements were performed. The results are shown in Table 1.

[0040] The Vickers hardness was calculated from the area of ​​the indentation by pressing a Vickers indenter with a load of 0.98 N for 5 seconds onto the surface of an optically polished glass material in a thermo-hygrostat chamber at a temperature of 25°C and a humidity of 60%.

[0041] The Young's modulus was measured by processing the glass material into parallel planes, optically polishing it, and then using an ultrasonic pulse method.

[0042] As shown in Table 1, the glass materials of Examples 1 to 5 had a Vickers hardness of 6.7 GPa to 9.5 GPa and a Young's modulus of 103 GPa to 137 GPa.

[0043] On the other hand, the glass material of Comparative Example 6 had a Vickers hardness of 6.1 GPa and a Young's modulus of 74 GPa. [Industrial Applicability]

[0044] The glass material of the present invention can be suitably used for semiconductor elements and cover members for optical devices, optical elements, and the like, which require high strength. [Explanation of symbols]

[0045] 1 Manufacturing equipment 10 mold 10a Molding surface 10b Gas vent 11 Gas supply mechanism 12 Raw material lump 13 Laser light irradiation device

Claims

1. In mole percent, R ２ O ３ 30% to 50%, SiO ２ More than 0% to 70%, SiO ２ +B ２ O ３ +P ２ O ５ +Al ２ O ３ Contains 40% to 70% The R ２ O ３ But Sc ２ O ３ , Y ２ O ３ and La ２ O ３ At least one selected from In mole percent, at least Sc ２ O ３ A glass material containing more than 15% of

2. In mole percent, B ２ O ３ 0% to less than 70%, P ２ O ５ 0% to less than 70%, Al ２ O ３ The glass material according to claim 1, containing 0% to less than 70%.

3. In mole percent, R 2 O 3 30% to less than 45%, SiO ２ +B ２ O ３ +P ２ O ５ +Al ２ O ３ The glass material according to claim 1 or 2, containing more than 55% to 70%.

4. In mole percent, SiO ２ The glass material according to any one of claims 1 to 3, containing 40% to 70%.

5. A composition comprising, in mole percent, 30% to 50% of R 2 O 3 , 40% to 70% of SiO 2 , and 40% to 70% of SiO 2 + B 2 O 3 + P 2 O 5 + Al 2 O 3 , the R 2 O 3 is at least one selected from Sc 2 O 3 , Y 2 O 3 and La 2 O 3 ; A glass material containing, in mole percent, at least more than 15% of Sc 2 O 3 .

6. The glass material according to claim 5, containing, in mole percent, 0% to 30% of B 2 O 3 , 0% to 30% of P 2 O 5 , and 0% to 30% of Al 2 O 3 .

7. 7. The glass material according to claim 1, having a Vickers hardness of 5.0 GPa or more.

8. 8. The glass material according to claim 1, having a Young's modulus of 80 GPa or more.

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