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Title:
ALUMINUM-ALLOY SUBSTRATE FOR MAGNETIC DISK, METHOD FOR MANUFACTURING SAME AND MAGNETIC DISK EMPLOYING SAID ALUMINUM-ALLOY SUBSTRATE FOR MAGNETIC DISK
Document Type and Number:
WIPO Patent Application WO/2019/159795
Kind Code:
A1
Abstract:
Provided are an aluminum-alloy substrate for a magnetic disk, a manufacturing method for said aluminum-alloy substrate, and a magnetic disk employing the aluminum-alloy substrate for a magnetic disk, the aluminum-alloy substrate comprising an aluminum alloy that contains Fe at 0.4 to 3.0 mass% (hereinafter, indicated as "%"), Cu at 0.005 to 1.000%, and Zn at 0.005 to 1.000%, the balance being Al and inevitable impurities, wherein the proportion (A/B) of the distribution density A of an Al-Fe-based intermetallic compound having a longest diameter that is equal to or greater than 10 μm and less than 16 μm and the distribution density B of an Al-Fe-based intermetallic compound having a longest diameter that is equal to or greater than 10 μm is equal to or greater than 0.70, and wherein the distribution density of an Al-Fe-based intermetallic compound having a longest diameter that is equal to or greater than 40 μm is equal to or less than 1 /mm2.

Inventors:
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)
FUJII Yasuo (2-3, Marunouchi 2-chome, Chiyoda-k, Tokyo 22, 〒1008322, JP)
SAKAMOTO Ryo (2-3, Marunouchi 2-chome, Chiyoda-k, Tokyo 22, 〒1008322, JP)
Application Number:
JP2019/004294
Publication Date:
August 22, 2019
Filing Date:
February 06, 2019
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:
G11B5/73; C22C21/00; C22F1/04; G11B5/84; 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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