Aluminum alloy plates for magnetic disks, aluminum alloy blanks for magnetic disks, and aluminum alloy substrates for magnetic disks
The aluminum alloy plate with a controlled intermetallic compound area ratio and specific composition addresses the challenge of maintaining machinability and thermal deformation resistance, enhancing the production of magnetic disks.
JP7832242B2Active Publication Date: 2026-03-17KOBE STEEL LTD
View PDF -1 Cites 0 Cited by
Patent Information
- Authority / Receiving Office
- JP · JP
- Patent Type
- Patents
- Current Assignee / Owner
- Filing Date
- 2024-02-19
- Publication Date
- 2026-03-17
Abstract
To provide an aluminum alloy plate for a magnetic disk, an aluminum alloy plate blank for a magnetic disk, and an aluminum alloy plate substrate for a magnetic disk, which have good grindability and are capable of suppressing thermal deformation during magnetic film sputtering.SOLUTION: An aluminum alloy plate for a magnetic disk contains 0.1-7.0 mass % of Mg, 0.005-1.0 mass % of Cr, 3-100 mass ppm of Be, 100 mass ppm or less of Zr, and 0.20 mass % or less of Si. The total of at least one or more of Fe, Mn, and Ni is 0.05-3.0 mass %, and the remainder comprises Al and impurities. The area ratio of an intermetallic compound on a surface is 0.10-40%, and the area ratio is calculated for an intermetallic compound having a maximum length of 0.33 μm or more.SELECTED DRAWING: None
Need to check novelty before this filing date? Find Prior Art