Magnetic disc, aluminum alloy substrate for magnetic disc, and production method for aluminum alloy substrate
US-11211088-B2 · Dec 28, 2021 · US
Aluminum alloy disc blank for magnetic disc and magnetic disc
US12087342B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-12087342-B2 |
| Application number | US-202318339994-A |
| Country | US |
| Kind code | B2 |
| Filing date | Jun 22, 2023 |
| Priority date | Dec 24, 2020 |
| Publication date | Sep 10, 2024 |
| Grant date | Sep 10, 2024 |
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Abstract
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An aluminum alloy disc blank for a magnetic disc made of an aluminum alloy containing Fe: 0.005 to 1.800 mass % with the balance being Al and inevitable impurities, wherein a flatness change of the aluminum alloy disc blank for a magnetic disc when the aluminum alloy disc blank for a magnetic disc is held in the atmosphere at 50° C. or lower for 336 hours is 2.0 μm or less.
First claim
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The invention claimed is: 1. An aluminum alloy disc blank for a magnetic disc made of an aluminum alloy comprising Fe: 0.005 to 1.800 mass %, Mn: 1.80 mass % or less, Cu: 1.00 mass % or less, Si: 14.00 mass % or less, Zn: 0.70 mass % or less, wherein Mn, Cu, Si, and Zn are present, with a balance being Al and inevitable impurities, and wherein the aluminum alloy disc blank for a magnetic disc has a flatness change when the aluminum alloy disc blank for a magnetic disc is held in the atmosphere at 50° C. or lower for 336 hours is 2.0 μm or less. 2. The aluminum alloy disc blank for a magnetic disc according to claim 1 , wherein the aluminum alloy further comprises one or more elements selected from the group consisting of Ni: 2.50 mass % or less, Mg: 4.50 mass % or less, Cr: 0.30 mass % or less, Zr: 0.15 mass % or less, Be: 0.0015 mass % or less, Sr: 0.10 mass % or less, Na: 0.10 mass % or less, and P: 0.10 mass % or less. 3. The aluminum alloy disc blank for a magnetic disc according to claim 1 , wherein the aluminum alloy disc blank for a magnetic disc has a crystal grain diameter on a surface thereof that is 18 μm or less. 4. The aluminum alloy disc blank for a magnetic disc according to claim 1 , wherein the aluminum alloy disc blank for a magnetic disc has a crystal grain diameter on a surface thereof that is 15 μm or less. 5. The aluminum alloy disc blank for a magnetic disc according to claim 1 , wherein the aluminum alloy disc blank for a magnetic disc has a crystal grain diameter on a surface thereof that is 12 μm or less. 6. The aluminum alloy disc blank for a magnetic disc according to claim 1 , wherein the aluminum alloy disc blank for a magnetic disc has a crystal grain diameter on a surface thereof that is 11 μm or less. 7. The aluminum alloy disc blank for a magnetic disc according to claim 1 , wherein the aluminum alloy disc blank for a magnetic disc has a crystal grain diameter on a surface thereof that is 10 μm or less. 8. A magnetic disc, comprising: on a surface of an aluminum alloy substrate made of the aluminum alloy disc blank for a magnetic disc according to claim 1 , a Ni—P plated layer; and a magnetic body layer on the Ni—P plated layer.
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Classifications
Producing a magnetic layer by electro-plating or electroless plating · CPC title
manufacturing base layers · CPC title
Composites or coated substrates · CPC title
of alloys with silicon as the next major constituent · CPC title
Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working (apparatus for mechanical working of metal B21, B23, B24) · CPC title
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- What does patent US12087342B2 cover?
- An aluminum alloy disc blank for a magnetic disc made of an aluminum alloy containing Fe: 0.005 to 1.800 mass % with the balance being Al and inevitable impurities, wherein a flatness change of the aluminum alloy disc blank for a magnetic disc when the aluminum alloy disc blank for a magnetic disc is held in the atmosphere at 50° C. or lower for 336 hours is 2.0 μm or less.
- Who is the assignee on this patent?
- Uacj Corp, Furukawa Electric Co Ltd
- 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 Sep 10 2024 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 3 related publications on this page (citations in our corpus or others sharing the same primary CPC).