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公开(公告)号：US20230111915A1
公开(公告)日：2023-04-13
申请号：US17907357
申请日：2021-04-06
Applicant: UACJ CORPORATION , FURUKAWA ELECTRIC CO., LTD.
Inventor： Kotaro KITAWAKI , Ryo SAKAMOTO , Wataru KUMAGAI , Hideyuki HATAKEYAMA
Abstract: An aluminum alloy substrate for magnetic disks, including an aluminum alloy containing Fe as an essential element; at least one of Mn or Ni as selective elements; and the balance including Al and unavoidable impurities, with the total amount of Fe, Mn, and Ni having a relationship of 0.10 to 7.00 mass %; in which the distribution of Si—K—O-based particles with a longest diameter of 1 μm or more adhering to the surface from the surrounding environment is equal to or less than one particle/6,000 mm2, and in which the distribution of Ti—B-based particles with a longest diameter of 1 μm or more present on the surface is equal to or less than one particle/6,000 mm2; and a magnetic disk using the aluminum alloy substrate.
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公开(公告)号：US20210264944A1
公开(公告)日：2021-08-26
申请号：US17262971
申请日：2019-07-24
Applicant: UACJ CORPORATION , FURUKAWA ELECTRIC CO., LTD.
Inventor： Kotaro KITAWAKI , Makoto YONEMITSU , Hideyuki HATAKEYAMA , Sadayuki TODA , Ryo SAKAMOTO , Yasuo FUJII
Abstract: An aluminum alloy sheet for a magnetic disk includes an aluminum alloy comprising 0.10 to 3.00 mass % (hereafter simply “%”) of Fe, 0.1 to 3.0% of Mn, 0.003 to 1.000% of Cu, and 0.005 to 1.000 s % of Zn, wherein second phase particles having a maximum diameter of 100 μm or more and 300 μm or less are dispersed at a distribution density of 50 particles/mm2 or less in a region (A) occupying 25% or less of a sheet thickness from a sheet thickness center plane to opposite surfaces of the sheet, second phase particles having a maximum diameter of 100 μm or more and 300 μm or less are 0 particles/mm2 in a region (C) that is obtained by excluding the region (A) from a region (B) occupying 50% or less of the sheet thickness from the sheet thickness center plane to the opposite surfaces of the sheet, and the amount of Mn solid solution is 0.03 mass % or more.
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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
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.
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24.发明申请公开(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
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.
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25.发明申请公开(公告)号：US20160351224A1
公开(公告)日：2016-12-01
申请号：US15117209
申请日：2015-09-24
Applicant: UACJ CORPORATION
Inventor： Kotaro KITAWAKI , Minoru HAYASHI , Yoshiji HASHIMOTO , Toshikazu HISAMOTO
IPC: G11B5/84 , C23C18/31 , C23F17/00 , G11B5/735 , C23C18/36 , B22D15/00 , B21B1/22 , C22F1/047 , C22C21/08
CPC classification number: G11B5/8404 , B21B1/22 , B21B2001/221 , B21B2001/225 , B21B2003/001 , B22D11/00 , B22D11/003 , B22D11/049 , B22D11/1206 , B22D15/00 , C22C21/06 , C22C21/08 , C22F1/00 , C22F1/047 , C23C18/1651 , C23C18/31 , C23C18/36 , C23C18/54 , C23F17/00 , G11B5/735
Abstract: An aluminum alloy plate for a magnetic disk substrate with a flat and smooth ground surface, a production method by which the aluminum alloy plate can be produced at low cost and a magnetic disk are shown. An aluminum alloy plate for a magnetic disk substrate which comprises an aluminum alloy containing Mg: 3.0 to 8.0 mass % (hereinafter %), Cu: 0.005 to 0.150%, Zn: 0.05 to 0.60%, Cr: 0.010 to 0.300%, Fe: 0.001 to 0.030%, Si: 0.001 to 0.030%, (Ti+V+Zr): 0.0010 to 0.0100%, B: 0.0001 to 0.0010% with a balance being Al and inevitable impurities, wherein the density of a Ti—V—B—Zr-based inclusion having a maximum diameter exceeding 5 μm is 0 piece/6000 mm2 and the density of a Ti—V—B—Zr-based inclusion having a maximum diameter of 3 to 5 μm is 1 piece/6000 mm2 or less; a production method thereof; and a method for producing a magnetic disk.
Abstract translation: 一种用于具有平坦且光滑的地面的磁盘基板的铝合金板，显示了可以低成本制造铝合金板的制造方法和磁盘。 一种含有Mg：3.0〜8.0质量％（以下％），Cu：0.005〜0.150％，Zn：0.05〜0.60％，Cr：0.010〜0.300％的Fe合金的铝合金板，Fe： 0.001〜0.030％，Si：0.001〜0.030％，（Ti + V + Zr）：0.0010〜0.0100％，B：0.0001〜0.0010％，余量为Al和不可避免的杂质，Ti-V-B 最大直径超过5μm的Zr基夹杂物为0个/ 6000mm 2，最大直径为3〜5μm的Ti-V-B-Zr系夹杂物的密度为1个/ 6000mm 2以下 ; 其制造方法; 以及制造磁盘的方法。
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Patent Agency Ranking
公开(公告)号：US20240018633A1
公开(公告)日：2024-01-18
申请号：US18334643
申请日：2023-06-14
Applicant: UACJ CORPORATION , FURUKAWA ELECTRIC CO., LTD.
Inventor： Kotaro KITAWAKI , Hideyuki HATAKEYAMA , Wataru KUMAGAI , Ryo SAKAMOTO
CPC classification number: C22C21/08 , C22C1/02 , C22F1/047 , G11B5/73919 , G11B5/84 , H01F1/147 , C22C2202/02
Abstract: An aluminum alloy disc blank for a magnetic disc made of an aluminum alloy containing Mg: 3.40 to 3.90 mass % with the balance being A1 and inevitable impurities, wherein a conductivity of the aluminum alloy disc blank is 36.0% IACS or higher.
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公开(公告)号：US20210358520A1
公开(公告)日：2021-11-18
申请号：US17296610
申请日：2019-10-25
Applicant: UACJ CORPORATION , FURUKAWA ELECTRIC CO., LTD.
Inventor： Takuya MURATA , Kotaro KITAWAKI , Makoto YONEMITSU , Hideyuki HATAKEYAMA , Ryo SAKAMOTO , Hiroki OTA
Abstract: An aluminum alloy substrate for a magnetic disk including an aluminum alloy containing 0.1 to 3.0 mass % of Fe, 0.005 to 1.000 mass % of Cu, and 0.005 to 1.000 mass % of Zn, with a balance of Al and inevitable impurities, wherein in an outer peripheral surface thereof, the number of holes having maximum diameters of 10 μm or more is 200/mm2 or less, an aluminum alloy base disk for a magnetic disk and a magnetic disk, using the aluminum alloy substrate, and methods for manufacturing these.
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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
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.
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公开(公告)号：US20210012801A1
公开(公告)日：2021-01-14
申请号：US16971860
申请日：2018-11-28
Applicant: UACJ CORPORATION , FURUKAWA ELECTRIC CO., LTD.
Inventor： Takuya MURATA , Kotaro KITAWAKI , Makoto YONEMITSU , Hideyuki HATAKEYAMA , Takashi NAKAYAMA , Ryo SAKAMOTO , Hiroki OTA
Abstract: Provided are a magnetic disk and a method of fabricating the magnetic disk. The magnetic disk includes an aluminum alloy plate fabricated by a process involving a CC method and a compound removal process, and an electroless Ni—P plating layer disposed on the surface of the plate. The aluminum alloy plate is composed of an aluminum alloy containing 0.4 to 3.0 mass % (hereinafter abbreviated simply as “%”) of Fe, 0.1% to 3.0% of Mn, 0.005% to 1.000% of Cu, 0.005% to 1.000% of Zn, with a balance of Al and unavoidable impurities. In the magnetic disk, the maximum amplitude of waviness in a wavelength range of 0.4 to 5.0 mm is 5 nm or less, and the maximum amplitude of waviness in a wavelength range of 0.08 to 0.45 mm is 1.5 nm or less.
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30.发明申请公开(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
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.
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