Aluminum alloy substrate for magnetic disc and magnetic disc
US12243570B2 · kind B2 · utility
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7Claims
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Key dates
| Filing date | Jun 14, 2023 |
| Grant date | Mar 4, 2025 |
| Priority date | — |
| Expiry date | Jun 14, 2043 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B5/8404
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An aluminum alloy substrate for a magnetic disc is made of an aluminum alloy, containing Fe: 1.80 mass % or less, Mn: 0.70 mass % or less, Ni: 2.50 mass % or less, Si: 2.50 mass % or less, Cu: 1.00 mass % or less, Zn: 0.48 mass % or less and Mg: 1.00 to 3.50 mass %, wherein a total content of Fe, Mn and Ni is 1.60 to 4.50 mass % and a mass ratio of Cu/Zn is 0.01 to 0.35 or 6.00 to 50.00, with a balance being Al and inevitable impurities.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.