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Glass for magnetic recording medium substrate, magnetic recording medium substrate, and magnetic recording medium

A magnetic recording medium and substrate technology, applied in the direction of magnetic recording, magnetic recording layer, base layer of recording layer, etc.

Active Publication Date: 2021-09-14
HOYA CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, there is a limit to using an aluminum substrate with poor surface hardness and rigidity.

Method used

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  • Glass for magnetic recording medium substrate, magnetic recording medium substrate, and magnetic recording medium
  • Glass for magnetic recording medium substrate, magnetic recording medium substrate, and magnetic recording medium
  • Glass for magnetic recording medium substrate, magnetic recording medium substrate, and magnetic recording medium

Examples

Experimental program
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Effect test

Embodiment

[0097] Hereinafter, the present invention will be described in more detail through examples. However, this invention is not limited to the form shown to an Example.

[0098] [Example No.1 to No.15]

[0099] Raw materials such as oxides, carbonates, nitrates, and hydroxides were weighed and mixed so as to obtain glasses having the compositions shown in Table 1 to prepare blended raw materials. The blended raw material is put into a melting tank, heated and melted in the range of 1400-1600°C to obtain a molten glass, and the molten glass is kept in a clarification tank at 1400-1550°C for 6 hours, and then the temperature is lowered. The range of -1400 degreeC was hold|maintained for 1 hour, clarification was performed, and molten glass was obtained.

[0100] (1) bubble density level

[0101] A glass plate (substrate blank) having a thickness of about 1.2 mm was produced from the molten glass obtained above. The surface of the glass plate is ground flat and smooth, and the in...

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Abstract

In mol%, SiO of glass for magnetic recording medium substrate 2 The content is 56-75%, Al 2 o 3 The content is 0.1~10%, Li 2 O content is 0~2%, Na 2 O and K 2 The total content of O is 3-15%, the total content of MgO, CaO and SrO is 14-35%, the content of Ti oxide is 0.20-2.50%, the total content of Sn oxide and Ce oxide is 0.10-1.55%, Sb oxide content is 0-0.02%, Li 2 O content relative to SiO 2 and Al 2 o 3 The molar ratio of the total content {Li 2 O / (SiO 2 +Al 2 o 3 )} is 0.02 or less, and the glass transition temperature is 600° C. or more.

Description

[0001] Cross-reference of related applications [0002] This application claims the priority of Japanese Patent Application No. 2015-132038 for which it applied on Jun. 30, 2015, and all descriptions are referred in this specification as an indication especially. technical field [0003] The present invention relates to a glass for a magnetic recording medium substrate, a magnetic recording medium substrate and a magnetic recording medium. Background technique [0004] Conventionally, substrates made of aluminum have been widely used as substrates for magnetic recording media such as hard disks (magnetic recording medium substrates). However, in recent years, for hard disk drives, in addition to impact resistance, high-density recording and thinning of magnetic recording media have been accompanied, and the requirements for improving the surface smoothness and thinning of magnetic recording medium substrates have become increasingly stringent. . Therefore, there is a limit...

Claims

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Application Information

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IPC IPC(8): C03C3/085C03C3/087G11B5/73
CPCC03C3/085C03C3/087G11B5/73921
Inventor 下岛胜治
Owner HOYA CORP