Glass material for a substrate, glass substrate, and information recording medium employing the same
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
C03C-003/093
C03C-003/095
출원번호
US-0227287
(2002-08-26)
우선권정보
JP-0166548 (2002-06-07)
발명자
/ 주소
Kawai, Hideki
출원인 / 주소
Minolta Co., Ltd.
대리인 / 주소
Burns, Doane, Swecker &
인용정보
피인용 횟수 :
10인용 특허 :
8
초록▼
A glass material for a substrate, or a glass substrate, consists essentially of the following glass ingredients: from 45 to 70 wt % of SiO2, from 1 to 10 wt % of Al2O3, from 0.5 to 8 wt % of B2O3, from 7 to 20 wt % of Li2O+Na2O+K2O, from 0.1 to 10 wt % of MgO, from 0.1 to 10 wt % of CaO, from 1 to 1
A glass material for a substrate, or a glass substrate, consists essentially of the following glass ingredients: from 45 to 70 wt % of SiO2, from 1 to 10 wt % of Al2O3, from 0.5 to 8 wt % of B2O3, from 7 to 20 wt % of Li2O+Na2O+K2O, from 0.1 to 10 wt % of MgO, from 0.1 to 10 wt % of CaO, from 1 to 15 wt % of MgO+CaO, from 0.5 to 10 wt % of TiO2, from 0.5 to 10 wt % of ZrO2, from 0 to 5 wt % of ZnO, and from 0 to 8 wt % of La2O3. The glass material, or the glass substrate, has uniform composition between at the surface and in the interior and has an amorphous structure. With this design, it is possible to obtain high mechanical strength without strengthening treatment, a linear thermal expansion coefficient close to motor components, and excellent chemical durability.
대표청구항▼
1. A glass material for a substrate, consisting essentially of the following glass ingredients:from 53 to 60 wt % of SiO2, from 4 to 8 wt % of Al2O3, from 3 to 4 wt % of B2O3, from 7 to 20 wt % of Li2O+Na2O+K2O, from 0.1 to 10 wt % of MgO, from 0.1 to 10 wt % of CaO, from 1 to 15 wt % of MgO+CaO, fr
1. A glass material for a substrate, consisting essentially of the following glass ingredients:from 53 to 60 wt % of SiO2, from 4 to 8 wt % of Al2O3, from 3 to 4 wt % of B2O3, from 7 to 20 wt % of Li2O+Na2O+K2O, from 0.1 to 10 wt % of MgO, from 0.1 to 10 wt % of CaO, from 1 to 15 wt % of MgO+CaO, from 3 to 7 wt % of TiO2, from 4 to 8 wt % of ZrO2, from 0 to 5 wt % of ZnO, and from 0 to 8 wt % of La2O3. 2. A glass material as claimed in claim 1, wherein the glass material has a linear thermal expansion coefficient A of 60×10?7/° C. or higher.3. A glass material as claimed in claim 1, wherein the glass material has alkali elution B of 250 ppb or lower per 2.5-inch disk.4. A glass material as claimed in claim 1, wherein the glass material has a Young's modulus E of 85 GPa or higher.5. A glass material as claimed in claim 1, wherein the glass material fulfills the following condition:(A/B)×E×107?30 whereA represents a linear thermal expansion coefficient (/° C.); B represents alkali elution (ppb) (per 2.5-inch disk); and E represents a Young modulus (GPa). 6. A glass material as claimed in claim 1, wherein the glass material fulfills the following conditions:A?70×10?7, B?150 ppb (per 2.5-inch disk), and E?90. 7. A glass substrate consisting essentially of the following glass ingredients:from 45 to 70 wt % of SiO2, from 1 to 10 wt % of Al2O3, from 0.5 to 8 wt % of B2O3, from 7 to 20 wt % of Li2O+Na2O+K2O, from 0.1 to 10 wt % of MgO, from 0.1 to 10 wt % of CaO, from 1 to 15 wt % of MgO+CaO, from 0.5 to 10 wt % of TiO2, from 0.5 to 10 wt % of ZrO2, from 0 to 5 wt % of ZnO, and from 0 to 8 wt % of La2O3, wherein the glass substrate has uniform composition between at a surface and in an interior and has an amorphous structure and wherein the glass substrate is produced by undergoing a polishing step and then a cleaning step in which the glass substrate is cleaned with at least one of a cure water liquid, an acidic liquid, and an alkaline liquid, and a surface roughness Ra after the polishing step and a surface roughness Ra′ after the cleaning step fulfill both of the following conditions: Ra′/Ra?1.5, and Ra?1.0 nm. 8. A glass material as claimed in claim 7, wherein the glass material has a Vickers hardness Hv higher than 550.9. A glass material as claimed in claim 7, wherein a liquid phase temperature TL at which the glass material is melted when produced is 1,300° C. or lower.10. A glass material as claimed in claim 7, wherein a temperature Tlogη=2 at which the glass material has a melt viscosity of logη=2 is 1,450° C. or lower.11. A glass material as claimed in claim 7, wherein the glass material has a glass transition point Tg of 600° C. or lower.12. An information recording medium comprising:a glass substrate; and a magnetic film formed on top of the glass substrate directly or with one or more primer and/or protective layers sandwiched in between, wherein the glass substrate consists essentially of the following glass ingredients: from 45 to 70 wt % of SiO2, from 1 to 10 wt % of Al2O3, from 05 to 8 wt % of B2O3, from 7 to 20 wt % of Li2O+Na2O+K2O, from 0.1 to 10 wt % of MgO, from 0.1 to 10 wt % of CaO, from 1 to 15 wt % of MgO+CaO, from 0.5 to 10 wt % of TiO2, from 0.5 to 10 wt % of ZrO2, from 0 to 5 wt % of ZnO, and from 0 to 8 wt % of La2O3, wherein the glass substrate is produced by undergoing a polishing step and then a cleaning step in which the glass substrate is cleaned with at least one of a pure water liquid, an acidic liquid, and an alkaline liquid, and a surface roughness Ra after the polishing step and a surface roughness Ra′ after the cleaning step fulfill both of the following conditions: Ra′/Ra?1.5, and Ra?1.0 nm. 13. A glass material for a substrate, consisting essentially of the following glass ingredients:from 53 to 70 wt % of SiO2, from 1 to 10 wt % of Al2O3, from 2 to 5 wt % of B2O3, from 7 to 20 wt % of Li2O+Na2O, from 0.1 to 10 wt % of MgO, from 0.1 to 10 wt % of CaO, from 1 to 15 wt % of MgO+CaO, from 0.5 to 10 wt % of TiO2, from 0.5 to 10wt % of ZrO2, from 0 to 5 wt % of ZnO, from 0 to 8 wt % of La2O3, from 60 to 75 wt % of SiO2+Al2O3+B2O3, and from 7 to 14 wt % of TiO2+ZrO2. 14. A glass material as claimed in claim 13, the glass material fulfills the following condition:(A/B)×E×107?30 whereA represents a linear thermal expansion coefficient (/° C.), B represents alkali elution (ppb) (per 2.5-inch disk), and E represents a Young's modulus (GPa).
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이 특허에 인용된 특허 (8)
Zou Xuelu,JPX ; Toratani Hisayoshi,JPX, Disc substrates for information recording discs and magnetic discs.
Nagashima, Tatsuo; Nagai, Kensuke; Nakashima, Tetsuya; Maeda, Kei, Glass for data storage medium substrate, glass substrate for data storage medium and magnetic disk.
Nagashima, Tatsuo; Nagai, Kensuke; Nakashima, Tetsuya; Maeda, Kei, Glass for data storage medium substrate, glass substrate for data storage medium and magnetic disk.
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