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公开(公告)号：US20240021213A1
公开(公告)日：2024-01-18
申请号：US18334651
申请日：2023-06-14
Applicant: UACJ CORPORATION , FURUKAWA ELECTRIC CO., LTD.
Inventor： Kotaro KITAWAKI , Hideyuki HATAKEYAMA , Wataru KUMAGAI , Ryo SAKAMOTO
IPC: G11B5/73
CPC classification number: G11B5/73919
Abstract: An aluminum alloy substrate for a magnetic disc is made of an aluminum alloy, containing Fe: 1.80 mass % or less, Mn: 0.70 mass % or less, Ni: 2.50 mass % or less, Si: 2.50 mass % or less, Cu: 1.00 mass % or less, Zn: 0.48 mass % or less and Mg: 1.00 to 3.50 mass %, wherein a total content of Fe, Mn and Ni is 1.60 to 4.50 mass % and a mass ratio of Cu/Zn is 0.01 to 0.35 or 6.00 to 50.00, with a balance being Al and inevitable impurities.
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公开(公告)号：US20230335161A1
公开(公告)日：2023-10-19
申请号：US18339994
申请日：2023-06-22
Applicant: UACJ CORPORATION , FURUKAWA ELECTRIC CO., LTD.
Inventor： Kotaro KITAWAKI , Ryo SAKAMOTO , Wataru KUMAGAI
CPC classification number: G11B5/73919 , G11B5/8404 , G11B5/858
Abstract: An aluminum alloy disc blank for a magnetic disc made of an aluminum alloy containing Fe: 0.005 to 1.800 mass % with the balance being Al and inevitable impurities, wherein a flatness change of the aluminum alloy disc blank for a magnetic disc when the aluminum alloy disc blank for a magnetic disc is held in the atmosphere at 50° C. or lower for 336 hours is 2.0 μm or less.
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公开(公告)号：US20230120845A1
公开(公告)日：2023-04-20
申请号：US17907490
申请日：2021-04-06
Applicant: UACJ CORPORATION , FURUKAWA ELECTRIC CO., LTD.
Inventor： Kotaro KITAWAKI , Wataru KUMAGAI , Ryo SAKAMOTO , Hideyuki HATAKEYAMA
Abstract: An aluminum alloy substrate for magnetic disks, including an aluminum alloy containing: 1.0 to 6.5 mass % of Mg; and the balance consisting of Al and unavoidable impurities, 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 for magnetic disks.
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公开(公告)号：US20220170142A1
公开(公告)日：2022-06-02
申请号：US17437204
申请日：2020-05-21
Applicant: UACJ Corporation
Inventor： Tomohito KUROSAKI , Hiroki TANAKA , Kotaro KITAWAKI
Abstract: An aluminum-alloy material (1) has an Al matrix and second-phase particles dispersed in the Al matrix, wherein the value of a metallographic-structure factor F indicated in Equation (1) below is 0.005 or more. F=A·ρ·L·exp(B·E) (1) Therein, in the above-mentioned Equation (1), L is the total [μm/μm2] of the perimeters of the second-phase particles, from among the second-phase particles present in an arbitrary cross section, whose circle-equivalent diameters are 0.2 μm or more, ρ is the dislocation density [μm−2], E is the electrical conductivity [% IACS] at 25° C., A and B are correction coefficients determined in accordance with the chemical composition of the aluminum-alloy material, 0.2×10−15≤A≤20×10−15, and 0.1≤B≤1.0.
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公开(公告)号：US20210201946A1
公开(公告)日：2021-07-01
申请号：US16648481
申请日：2019-09-18
Applicant: UACJ CORPORATION , FURUKAWA ELECTRIC CO., LTD.
Inventor： Kotaro KITAWAKI , Makoto YONEMITSU , Takashi NAKAYAMA , Kimie IMAKAWA , Hideyuki HATAKEYAMA
Abstract: Provided is an aluminium alloy substrate for a magnetic disk, a method for fabricating the substrate, and a magnetic disk composed of the aluminium alloy substrate for a magnetic disk. The substrate contains an aluminium alloy composed of one or more elements selected from a group comprising 0.05 to 3.00 mass % (hereinafter abbreviated as “%”) of Fe, 0.05% to 3.00% of Mn, 0.05% to 18.00% of Si, 0.05% to 8.00% of Ni, 0.05% to 3.00% of Cr, and 0.05% to 3.00% of Zr, with a balance of Al and unavoidable impurities. The substrate has a Young modulus of 67 GPa or more in each of the 0° direction, 45° direction, and 90° direction relative to the rolling direction of the substrate.
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Patent Agency Ranking
公开(公告)号：US20210065742A1
公开(公告)日：2021-03-04
申请号：US16644612
申请日：2018-05-15
Applicant: UACJ CORPORATION , FURUKAWA ELECTRIC CO., LTD.
Inventor： Kotaro KITAWAKI , Hideyuki HATAKEYAMA , Takashi NAKAYAMA , Yasuo FUJII , 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 % (hereinafter, “%”) of Fe, less than 0.10% of Si, less than 0.10% of Mg, and the balance of Al and unavoidable impurities, in which an Al—Fe-based intermetallic compound having a longest diameter of 2 μm or more and less than 3 μm is dispersed at a distribution density of 1000 particles/mm2 or more, and a Mg—Si-based intermetallic compound having a longest diameter of 1 μm or more is dispersed at a distribution density of 1 particle/mm2 or less; a method for producing the same; and a magnetic disk in which an electroless Ni—P plating treatment layer and a magnetic layer thereon are disposed on a surface of the aluminum alloy substrate for a magnetic disk.
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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
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.
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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
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.
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公开(公告)号：US20240233766A9
公开(公告)日：2024-07-11
申请号：US18547728
申请日：2022-02-28
Applicant: UACJ CORPORATION , FURUKAWA ELECTRIC CO., LTD.
Inventor： Kotaro KITAWAKI , Shinpei TODO , Ryohei YAMADA , Hideyuki HATAKEYAMA
IPC: G11B19/20
CPC classification number: G11B19/2045
Abstract: A magnetic disk device includes a plurality of disk-shaped magnetic disks 30, spacers 80, a hub 90, a clamp 70, and a fastening member 72. Each of the magnetic disks 30 includes a through-hole in a center section thereof. Each of the spacers 80 includes a through-hole in a center section thereof, and is disposed among the magnetic disks 30. The hub 90 is inserted into the through-holes of the magnetic disks 30 and the spacers 80. The clamp 70 presses and holds the magnetic disks 30 and the spacers 80. The fastening member 72 fastens the clamp 70 to the hub 90. The clamp 70 is fastened to the hub by the fastening member 72 with a torque of from 5 cN·m to 45 cN·m.
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公开(公告)号：US20230238027A1
公开(公告)日：2023-07-27
申请号：US18002695
申请日：2021-06-30
Applicant: UACJ CORPORATION , FURUKAWA ELECTRIC CO., LTD.
Inventor： Kotaro KITAWAKI , Hideyuki HATAKEYAMA , Wataru KUMAGAI , Ryo SAKAMOTO
CPC classification number: G11B5/73921 , G11B5/82 , B32B15/20 , B32B17/061 , B32B2307/7375 , B32B2307/208
Abstract: A magnetic disk substrate includes an aluminum alloy including one type or two or more types of Fe: 8.5 mass % or less, Mn: 2.5 mass % or less, Ni: 6.5 mass % or less, and Mg: 4.5 mass % or less, a balance being Al and unavoidable impurities, wherein, when f (Hz) is a resonance frequency, ρ (g/cm3) is a density, and t (mm) is a plate thickness, (f×ρ/t) is 3800 or greater; and a magnetic disk using the magnetic disk substrate.
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