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Patent Searching and Data


Title:
MAGNETIC DISC, ALUMINUM ALLOY SUBSTRATE FOR MAGNETIC DISC, AND PRODUCTION METHOD FOR ALUMINUM ALLOY SUBSTRATE
Document Type and Number:
WIPO Patent Application WO/2019/163239
Kind Code:
A1
Abstract:
Provided are a magnetic disc and a production method therefor, said magnetic disc being characterized in that: the magnetic disc is provided with an electroless Ni-P plating layer formed, through a compound removal process, on a surface of an aluminum alloy sheet produced by a continuous casting (CC) method from an aluminum alloy containing Fe: 0.4-3.0 mass% (hereinafter referred to simply as %), Mn: 0.1-3.0%, Cu: 0.005-1.000%, Zn: 0.005-1.000%, and the balance Al and inevitable impurities; the maximum amplitude of waviness having a wavelength of 0.4-5.0 mm is less than or equal to 5 nm; and the maximum amplitude of waviness having a wavelength of 0.08-0.45 mm is less than or equal to 1.5 nm.

Inventors:
MURATA Takuya (1-7-2 Otemachi, Chiyoda-k, Tokyo 04, 〒1000004, JP)
KITAWAKI Kotaro (1-7-2 Otemachi, Chiyoda-k, Tokyo 04, 〒1000004, JP)
YONEMITSU Makoto (1-7-2 Otemachi, Chiyoda-k, Tokyo 04, 〒1000004, JP)
HATAKEYAMA Hideyuki (2-3, Marunouchi 2-chome, Chiyoda-k, Tokyo 22, 〒1008322, JP)
NAKAYAMA Takashi (2-3, Marunouchi 2-chome, Chiyoda-k, Tokyo 22, 〒1008322, JP)
SAKAMOTO Ryo (2-3, Marunouchi 2-chome, Chiyoda-k, Tokyo 22, 〒1008322, JP)
OTA Hiroki (2-3, Marunouchi 2-chome, Chiyoda-k, Tokyo 22, 〒1008322, JP)
Application Number:
JP2018/043880
Publication Date:
August 29, 2019
Filing Date:
November 28, 2018
Export Citation:
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Assignee:
UACJ CORPORATION (1-7-2, Otemachi Chiyoda-k, Tokyo 04, 〒1000004, JP)
FURUKAWA ELECTRIC CO., LTD. (2-3 Marunouchi 2-chome, Chiyoda-ku Tokyo, 22, 〒1008322, JP)
International Classes:
G11B5/65; C22C21/00; C22F1/04; G11B5/73; G11B5/82; G11B5/84; C22C21/10; C22C21/12; C22F1/00
Attorney, Agent or Firm:
KIMURA MITSURU (2nd Floor, Kyohan Building 7, Kandanishiki-cho 2-chome, Chiyoda-k, Tokyo 54, 〒1010054, JP)
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