Aluminum alloy substrate for magnetic disks, method for producing same, and magnetic disk using said aluminum alloy substrate for magnetic disks
US11721361B2 · kind B2 · utility
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Key dates
| Filing date | Apr 9, 2018 |
| Grant date | Aug 8, 2023 |
| Priority date | — |
| Expiry date | May 16, 2040 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B5/73919
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
There are provided: an aluminum alloy substrate for a magnetic disk, the aluminum alloy substrate including an aluminum alloy including 0.4 to 3.0 mass % of Fe and the balance of Al and unavoidable impurities, in which second phase particles having a longest diameter of 0.5 μm or more and less than 2.0 μm are dispersed at a distribution density of 5000 particles/mm2 or more; a method for producing the same; and a magnetic disk using the aluminum alloy substrate for a magnetic disk.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.