公开(公告)号：US20190284668A1

公开(公告)日：2019-09-19

申请号：US16349850

申请日：2017-10-27

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

Inventor： Takuya MURATA ,  Kotaro KITAWAKI ,  Makoto YONEMITSU ,  Naoki KITAMURA ,  Yasuo FUJII ,  Tetsu SAKAI ,  Hideki TAKAHASHI ,  Takashi MORI

IPC: C22F1/047 ,  C22C21/08 ,  G11B5/73 ,  G11B5/84

Abstract: There are provided: an aluminum alloy substrate for a magnetic disk, including 2.0 to 10.0 mass % (hereinafter, simply referred to as “%”) of Mg, 0.003 to 0.150% of Cu, 0.05 to 0.60% of Zn, 0.03 to 1.00% of Mn, and 0.00001 to 0.00200% of Be, as well as Fe restricted to 0.50% or less, Si restricted to 0.50% or less, Cr restricted to 0.30% or less, and Cl restricted to 0.005% or less, with the balance of Al and unavoidable impurities; and a method of producing the aluminum alloy substrate for a magnetic disk.

公开(公告)号：US20210082465A1

公开(公告)日：2021-03-18

申请号：US17028885

申请日：2020-09-22

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

Inventor： Kimie IMAKAWA ,  Toshihiro NAKAMURA ,  Hideki TAKAHASHI ,  Keita YOSHIMURA ,  Wataru KUMAGAI ,  Naoki KITAMURA ,  Kotaro KITAWAKI

IPC: G11B5/73 ,  G11B5/84

Abstract: An aluminum alloy substrate (1) for magnetic disk satisfies at least two of three inequalities of an inequality group [A] and satisfies all of four inequalities of an inequality group [B], or satisfies at least two of the three inequalities of the inequality group [A] and satisfies all of four inequalities of an inequality group [C], when a plate thickness of the disk at a position (b1) is defined as tb1, a plate thickness at a position (b2) is defined as tb2, a plate thickness at a position (b3) is defined as tb3, a plate thickness at a position (a1) is defined as ta1, a plate thickness at a position (a2) is defined as ta2, and a plate thickness at a position (a3) is defined as ta3.

公开(公告)号：US20190172487A1

公开(公告)日：2019-06-06

申请号：US16265884

申请日：2019-02-01

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

Inventor： Kotaro KITAWAKI ,  Takuya MURATA ,  Akira HIBINO ,  Naoki KITAMURA ,  Hiroki OTA ,  Yasuo FUJII ,  Hideki TAKAHASHI ,  Takashi MORI

IPC: G11B5/73 ,  C22F1/047 ,  C22C21/08 ,  C22C1/02

Abstract: An aluminum alloy plate for a magnetic disc substrate according to the present disclosure includes, in mass %, Mg: 3.0 to 8.0%, Cu: 0.002 to 0.150%, Zn: 0.05 to 0.60%, Fe: 0.001 to 0.060%, Si: 0.001 to 0.060%, Be: 0.00001 to 0.00200%, Cr: 0.200% or less, Mn: 0.500% or less, and Cl: 0.00300% or less, with the balance being Al and inevitable impurities, and an abundance of a Cr oxide having a maximum diameter of 3 to 10 μm observed in a metal structure is 1 or less per single side of a disc.

公开(公告)号：US20210008864A1

公开(公告)日：2021-01-14

申请号：US17035467

申请日：2020-09-28

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

Inventor： Toshihiro NAKAMURA ,  Hideki TAKAHASHI ,  Kimie IMAKAWA ,  Naoki KITAMURA ,  Kotaro KITAWAKI ,  Takuya MURATA

IPC: B32B43/00 ,  B32B15/01 ,  B65H1/04 ,  B65H3/62

Abstract: A peeling apparatus for an aluminum plate material is configured to be able to peel one or a plurality of aluminum plate materials from a stack of aluminum plate materials in which a plurality of aluminum plate materials are pressure-annealed and adhered to each other. The peeling apparatus includes a vibration transmitting section that is configured to be able to abut an outer peripheral surface of an aluminum plate material and is configured to be able to apply vibration along a stacking direction of the stack to the aluminum plate material, and a transducer that generates the vibration, and transmits the vibration to the vibration transmitting section.

公开(公告)号：US20180190316A1

公开(公告)日：2018-07-05

申请号：US15570751

申请日：2016-05-23

Applicant: UACJ Corporation ,  Furukawa Electric Co., Ltd.

Inventor： Kotaro KITAWAKI ,  Takuya MURATA ,  Akira HIBINO ,  Naoki KITAMURA ,  Masanobu ONISHI ,  Hideki TAKAHASHI ,  Satoshi YAMAZAKI ,  Sadayuki TODA

IPC: G11B5/65 ,  G11B5/858 ,  C22C21/06 ,  C22F1/047

Abstract: The present invention provides: an aluminum alloy substrate for magnetic discs with excellent plating surface smoothness; a manufacturing method therefor; and a magnetic disc using said aluminum alloy substrate for magnetic discs. The present invention is an aluminum alloy substrate for magnetic discs, a manufacturing method therefor, and a magnetic disc using said aluminum alloy substrate for magnetic discs, the aluminum alloy substrate being characterized in being obtained from an aluminum alloy containing Mg: 2.0-8.0 mass % (“%” below), Be: 0.00001-0.00200%, Cu: 0.003-0.150%, Zn: 0.05-0.60%, Cr: 0.010-0.300%, Si: 0.060% or less, Fe: 0.060% or less, the balance being obtained from Al and unavoidable impurities.