Aluminum alloy substrate for magnetic recording medium, substrate for magnetic recording medium, magnetic recording medium, and hard disk drive
US-2019062878-A1 · Feb 28, 2019 · US
Magnetic recording medium substrate and hard disk drive
US10593359B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-10593359-B2 |
| Application number | US-201715621319-A |
| Country | US |
| Kind code | B2 |
| Filing date | Jun 13, 2017 |
| Priority date | Jul 8, 2016 |
| Publication date | Mar 17, 2020 |
| Grant date | Mar 17, 2020 |
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Abstract
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A magnetic recording medium substrate is provided in which a NiP type plating film is formed on a surface of an aluminum alloy substrate that includes Si in a range of 9.5 mass % or more and 11.0 mass % or less, Mn in a rage of 0.45 mass % or more and 0.90 mass % or less, Zn in a range of 0.32 mass % or more and 0.38 mass % or less, Sr in a range of 0.01 mass % or more and 0.05 mass % or less. In the alloy structure of the aluminum alloy substrate, an average particle diameter of Si particles is 2 μm or less, the film thickness of the NiP type plating film is 7 μm or more. An outer diameter of the magnetic recording medium substrate is 53 mm or more, the thickness is 0.9 mm or less, and the Young's modulus is 79 GPa or more.
First claim
Opening claim text (preview).
What is claimed is: 1. A magnetic recording medium substrate in which a NiP plating film is formed on a surface of an aluminum alloy substrate, wherein the aluminum alloy substrate includes Si in a range of 9.5 mass % or more and 11.0 mass % or less, Mn in a range of 0.45 mass % or more and 0.90 mass % or less, Zn in a range of 0.32 mass % or more and 0.38 mass % or less, Sr in a range of 0.01 mass % or more and 0.05 mass % or less, wherein an average particle diameter of Si particles in an alloy structure of the aluminum alloy substrate is 2 μm or less, wherein film thickness of the NiP plating film is 7 μm or more, and wherein an outer diameter of the magnetic recording medium substrate is 53 mm or more, thickness of the magnetic recording medium substrate is 0.9 mm or less, and Young's modulus (E) of the magnetic recording medium substrate is 79 GPa or more. 2. The magnetic recording medium substrate according to claim 1 , wherein, in the aluminum alloy substrate, Mg content is 0.01 mass % or less, or Mg is not included. 3. The magnetic recording medium substrate according to claim 1 , wherein, in a case where density is ρ (g/cm 3 ), E/ρ of the magnetic recording medium substrate is 29 GPa*cm 3 /g or more. 4. A hard disk drive that uses the magnetic recording medium substrate according to claim 1 , wherein the hard disk drive uses six or more of the magnetic recording medium substrate. 5. The hard disk drive according to claim 4 , wherein the inside of a hard disk drive case of the hard disk drive includes air. 6. The hard disk drive according to claim 4 , wherein the hard disk drive is a 3.5 inch standardized hard disk drive.
Assignees
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Classifications
Producing a magnetic layer by electro-plating or electroless plating · CPC title
Inorganic substrates · CPC title
specially adapted for disk drive assemblies, e.g. assembly prior to operation, hard or flexible disk drives (G11B5/488 - G11B5/54 take precedence) · CPC title
- G11B5/73919Primary
Aluminium or titanium elemental or alloy substrates · CPC title
- G11B5/73913Primary
Composites or coated substrates · CPC title
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Frequently asked questions
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- What does patent US10593359B2 cover?
- A magnetic recording medium substrate is provided in which a NiP type plating film is formed on a surface of an aluminum alloy substrate that includes Si in a range of 9.5 mass % or more and 11.0 mass % or less, Mn in a rage of 0.45 mass % or more and 0.90 mass % or less, Zn in a range of 0.32 mass % or more and 0.38 mass % or less, Sr in a range of 0.01 mass % or more and 0.05 mass % or less. …
- Who is the assignee on this patent?
- Showa Denko Kk
- What technology area does this patent fall under?
- Primary CPC classification G11B5/73919. Mapped technology areas include Physics.
- When was this patent published?
- Publication date Tue Mar 17 2020 00:00:00 GMT+0000 (Coordinated Universal Time) (B2). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 7 related publications on this page (citations in our corpus or others sharing the same primary CPC).