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Aluminum alloy substrate for magnetic disks, method for producing same, and magnetic disk using aluminum alloy substrate for magnetic disks

An aluminum alloy substrate and a technology for a manufacturing method, which are applied to the aluminum alloy substrate for magnetic disks and its manufacture, and the field of magnetic disks using the aluminum alloy substrate for magnetic disks, can solve the problems of unobtained, different chattering suppression effects, and easy occurrence of disk chattering, etc. problem, to achieve the effect of excellent flutter characteristics

Active Publication Date: 2019-10-15
FURUKAWA SKY ALUMINUM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0010] However, in the method disclosed in Patent Document 1, the flutter suppression effect differs due to the difference in the distance between the installed air spoiler and the magnetic disk substrate, and the high precision of the parts is required, which leads to an increase in the cost of the parts.
[0011] In addition, although the method of adding a large amount of Mg to the aluminum alloy plate shown in Patent Document 2 is effective for improving the strength, the current situation is that the disc chatter is prone to occur, and the targeted small disc chatter characteristics have not been obtained.

Method used

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  • Aluminum alloy substrate for magnetic disks, method for producing same, and magnetic disk using aluminum alloy substrate for magnetic disks
  • Aluminum alloy substrate for magnetic disks, method for producing same, and magnetic disk using aluminum alloy substrate for magnetic disks
  • Aluminum alloy substrate for magnetic disks, method for producing same, and magnetic disk using aluminum alloy substrate for magnetic disks

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Embodiment

[0131] Hereinafter, the present invention will be described in more detail based on examples, but the present invention is not limited thereto.

[0132] 1. Aluminum alloy substrate for disk with bare material

[0133] First, an example of a bare aluminum alloy substrate for a magnetic disk will be described. Each alloy material with the composition shown in Table 1 to Table 3 was melted according to a conventional method to produce an aluminum alloy melt (step S101 ). In Tables 1 to 3, "-" indicates a measurement limit value or less.

[0134] [Table 1]

[0135]

[0136] [Table 2]

[0137]

[0138] [table 3]

[0139]

[0140] Next, as shown in Tables 4 to 6, alloy Nos.A1 to A26, A28 to A31, A35 to A64, AC1 and AC3 to AC13 cast aluminum alloy melts by the DC casting method and make slabs, alloy Nos.A27, A32-A34, A65, and AC2 cast aluminum alloy melts by the CC casting method to produce cast slabs (step S102 ). The slabs of alloy Nos. A36 to A43, A54, A55, A57, A59...

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Abstract

An aluminum alloy substrate for magnetic disks, which is characterized by being formed from an aluminum alloy that contains 0.4-3.0 mass% of Fe with the balance made up of Al and unavoidable impurities; a method for producing the aluminum alloy substrate for magnetic disks; and a magnetic disk which is characterized in that an electroless Ni-P plating layer and a magnetic material layer on top ofthe electroless Ni-P plating layer are provided on the surface of the aluminum alloy substrate for magnetic disks.

Description

technical field [0001] The present invention relates to an aluminum alloy substrate for a magnetic disk having high strength and good fluttering characteristics, a method for producing the same, and a magnetic disk using the aluminum alloy substrate for a magnetic disk. Background technique [0002] Magnetic disks used in computer storage devices are manufactured using substrates that have good plating properties and are excellent in mechanical properties and processability. For example, based on JIS5086 (containing Mg: 3.5-4.5mass%, Fe: 0.50mass% or less, Si: 0.40mass% or less, Mn: 0.20-0.70mass%, Cr: 0.05-0.25mass%, Cu: 0.10mass% Below, Ti: 0.15mass% or less, and Zn: 0.25mass% or less, the remainder is composed of Al and unavoidable impurities) aluminum alloy-based substrates, etc. are manufactured. [0003] A general magnetic disk is manufactured by first manufacturing an annular aluminum alloy substrate, plating the aluminum alloy substrate, and then attaching a magneti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G11B5/73C22C21/00C22F1/00C22F1/04G11B5/84
CPCC22C21/00C22F1/00C22F1/04G11B5/73919G11B5/73913G11B5/858
Inventor 北脇高太郎村田拓哉米光诚滝口浩一郎中山贤今川公惠藤井康生畠山英之
Owner FURUKAWA SKY ALUMINUM CORP
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