Title:
磁気記録媒体用アルミニウム合金基板とその製造方法、磁気記録媒体用基板、磁気記録媒体およびハードディスクドライブ
Document Type and Number:
Japanese Patent JP7011943
Kind Code:
B2
Abstract:
This aluminum alloy substrate for a magnetic recording medium has a metal structure made of an Al alloy having a composition including Si in a range of 18.0% by mass to 22.0% by mass, Fe in a range of 4.0% by mass to 6.0% by mass, Cu in a range of 2.5% by mass to 4.0% by mass, and Mg in a range of 0.8% by mass to 1.5% by mass with a remainder being Al, a primary-crystal Si precipitate having a maximum diameter of 0.5 μm or more and an average particle diameter of 2 μm or less is dispersed in the metal structure, a diameter is in a range of 53 mm to 97 mm, and a thickness is in a range of 0.2 mm to 0.9 mm.
Inventors:
Takenori Hashimoto
Wataru Sato
Wataru Sato
Application Number:
JP2018007500A
Publication Date:
February 10, 2022
Filing Date:
January 19, 2018
Export Citation:
Assignee:
SHOWA DENKO K.K.
International Classes:
G11B5/73; B22F3/20; C22C1/04; C22C21/02; G11B5/84; B22F1/05
Domestic Patent References:
| JP2018005969A | ||||
| JP2104641A | ||||
| JP60194050A | ||||
| JP60125345A | ||||
| JP60145349A | ||||
| JP11195282A |
Foreign References:
| WO2017188320A1 |
Attorney, Agent or Firm:
Shu Oikawa
Norihiko Ara
Tomomasa Katsumata
Norihiko Ara
Tomomasa Katsumata