公开(公告)号：US20210319806A1

公开(公告)日：2021-10-14

申请号：US17284187

申请日：2019-10-15

Applicant: UACJ CORPORATION ,  FURUKAWA ELECTRIC CO., LTD.

Inventor： Kotaro KITAWAKI ,  Yu IGARASHI ,  Keisuke KAMIYA ,  Yu MATSUI ,  Makoto YONEMITSU ,  Ryo SAKAMOTO ,  Hideyuki HATAKEYAMA ,  Hiroki OTA

IPC: G11B5/706 ,  C22C21/02 ,  C23C18/32

Abstract: An aluminum alloy sheet for a magnetic disk, a method for manufacturing same, and a magnetic disk using same. The aluminum alloy sheet is made of an aluminum alloy comprising 0.10 to 3.00 mass % of Fe, 0.003 to 1.000 mass % of Cu, and 0.005 to 1.000 mass % of Zn, with a balance of Al and unavoidable impurities, wherein a value obtained by dividing a difference in an area ratio (%) of second phase particles between a region (A) and a region (B) by an average value of area ratios (%) of second phase particles in the regions (A) and (B) is 0.05 or less, the region (A) being a region from a sheet thickness center plane to a front surface of the sheet, and the region (B) being a region from the sheet thickness center plane to a rear surface of the plate.

公开(公告)号：US20210151077A1

公开(公告)日：2021-05-20

申请号：US16611770

申请日：2018-04-09

Applicant: UACJ CORPORATION ,  FURUKAWA ELECTRIC CO., LTD.

Inventor： Kotaro KITAWAKI ,  Takuya MURATA ,  Makoto YONEMITSU ,  Yu MATSUI ,  Yasuo FUJII ,  Ryo SAKAMOTO ,  Takashi NAKAYAMA ,  Wataru KUMAGAI

IPC: G11B5/73 ,  C22C21/12 ,  C22C21/10 ,  C22C21/06 ,  C22F1/057 ,  C22F1/053 ,  C22F1/047

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.

公开(公告)号：US20190066724A1

公开(公告)日：2019-02-28

申请号：US16171005

申请日：2018-10-25

Applicant: UACJ CORPORATION ,  FURUKAWA ELECTRIC CO., LTD.

Inventor： Toshihiro NAKAMURA ,  Takashi NAKAYAMA ,  Kimie IMAKAWA ,  Wataru KUMAGAI ,  Sadayuki TODA ,  Kotaro KITAWAKI ,  Takuya MURATA ,  Yu MATSUI ,  Makoto YONEMITSU ,  Hideyuki HATAKEYAMA

IPC: G11B5/73 ,  C22F1/04 ,  C22C21/00 ,  G11B5/84

Abstract: An aluminum alloy substrate for a magnetic disk, wherein the sum of the circumferences of second phase particles having the longest diameter of 4 μm or more and 30 μm or less in the metal microstructure is 10 mm/mm2 or more.