Aluminum alloy substrate for magnetic recording medium, substrate for magnetic recording medium, magnetic recording medium, and hard disk drive

A technology for magnetic recording media and aluminum alloy substrates, which is used in magnetic recording, data recording, recording information storage, etc., and can solve problems such as difficulty in reading hard disk drives stably

Inactive Publication Date: 2020-07-07
RESONAC HOLDINGS CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the chatter becomes large, it will be difficult to stably read the magnetic information of the hard disk drive

Method used

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  • Aluminum alloy substrate for magnetic recording medium, substrate for magnetic recording medium, magnetic recording medium, and hard disk drive
  • Aluminum alloy substrate for magnetic recording medium, substrate for magnetic recording medium, magnetic recording medium, and hard disk drive
  • Aluminum alloy substrate for magnetic recording medium, substrate for magnetic recording medium, magnetic recording medium, and hard disk drive

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～4、 comparative example 1～5

[0101] [Aluminum alloy plate]

[0102] As Al raw materials, pure Al lumps, Si, Fe, Mn, Cu, Mg, Zn, Sr, Zr, Ti, Ni, and Cr were prepared. In addition, each raw material of pure Al bulk, Si, Fe, Mn, Cu, Mg, Zn, Sr, Zr, Ti, Ni, and Cr was prepared with a purity of 99.9% by mass or more.

[0103] The prepared raw materials of each element were weighed so that the composition after casting would be the composition shown in Table 1 below, and they were melted at 820° C. in the air to prepare alloys 1 to 3. The obtained alloys 1 to 3 were fabricated into aluminum alloy ingots using a direct chill casting method (DC casting method). Next, the obtained aluminum alloy ingot was held at 460° C. for 2 hours to perform a homogenization treatment. Thereafter, rolling was performed to obtain a plate material with a thickness of 0.50 mm. In Examples 1 to 4 and Comparative Examples 1 to 5, in order to change the average number and average particle size of the coarse crystal grains of the al...

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PUM

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Abstract

The present invention discloses an aluminum alloy substrate for a magnetic recording medium, a substrate for the magnetic recording medium, the magnetic recording medium, and a hard disk drive. What is provided is an aluminum alloy substrate for a magnetic recording medium which has high rigidity and an excellent plating properties. The aluminum alloy substrate for a magnetic recording medium hasa constitution in which coarse grains whose average grain size is within a range that exceeds 2 [mu]m and is less than or equal to 20 [mu]m are dispersed, the average number of coarse grains per areaof 0.042 mm2 is 100 or more, and a surface roughness Ra is less than or equal to 0.2 [mu]m.

Description

technical field [0001] The present invention relates to an aluminum alloy substrate for a magnetic recording medium, a substrate for a magnetic recording medium, a magnetic recording medium, and a hard disk drive (HDD). [0002] This application claims priority to Japanese Patent Application No. 2018-247150 filed on December 28, 2018, and uses the content thereof here. Background technique [0003] In recent years, magnetic recording media used in hard disk drives have gradually achieved a significant increase in recording density. In particular, since the introduction of MR (magneto resistive, magnetoresistive) head and PRML (Partial Response Maximum Likelihood, partial response maximum likelihood) technology, the increase in areal recording density of magnetic recording media has further increased dramatically. [0004] In addition, due to the development of the Internet and the expansion of big data applications in recent years, the data storage capacity of data centers ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C18/50G11B5/82
CPCC23C18/50G11B5/82G11B5/7353G11B5/73919G11B5/7371
Inventor 幸松孝治町田裕之横山翔
Owner RESONAC HOLDINGS CORPORATION
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