Title:
GLASS SUBSTRATE FOR MAGNETIC RECORDING MEDIUM, GLASS DISK FOR MAGNETIC RECORDING MEDIUM, METHOD FOR MANUFACTURING MAGNETIC RECORDING MEDIUM, AND METHOD FOR MANUFACTURING GLASS DISK
Document Type and Number:
WIPO Patent Application WO/2023/100893
Kind Code:
A1
Abstract:
A glass substrate for a magnetic recording medium according to the present invention is characterized by having an average linear thermal expansion coefficient in the temperature range of 30-380°C which is 30×10-7/°C-40×10-7/°C, a Young's modulus of not less than 80 GPa, a specific Young's modulus of not less than 30 GPa/g·cm-3, and a strain point of not lower than 700°C.
Inventors:
MIWA SHINKICHI (JP)
Application Number:
PCT/JP2022/044030
Publication Date:
June 08, 2023
Filing Date:
November 29, 2022
Export Citation:
Assignee:
NIPPON ELECTRIC GLASS CO (JP)
International Classes:
G11B5/73; C03C3/091; C03C3/093; G11B5/82; G11B5/84
Domestic Patent References:
| WO2020032146A1 | 2020-02-13 | |||
| WO2020256945A1 | 2020-12-24 |
Foreign References:
| JP2021086643A | 2021-06-03 | |||
| JP2017052661A | 2017-03-16 | |||
| JP2021075407A | 2021-05-20 |
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