ALUMINUM ALLOY SUBSTRATE FOR MAGNETIC DISK AND MANUFACTURING METHOD THEREFOR, AND MAGNETIC DISK USING THE ALUMINUM ALLOY SUBSTRATE FOR MAGNETIC DISK

To provide an aluminum alloy substrate for a magnetic disk having good flattering property and strength, a manufacturing method therefor, and a magnetic disk using the aluminum alloy substrate for a magnetic disk.SOLUTION: There are provided an aluminum alloy substrate for a magnetic disk consisting...

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Bibliographic Details
Main Authors HATAKEYAMA HIDEYUKI, YONEMITSU MAKOTO, KITAWAKI KOTARO, SAKAMOTO RYO, OTA YUKI
Format Patent
LanguageEnglish
Japanese
Published 16.01.2020
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Summary:To provide an aluminum alloy substrate for a magnetic disk having good flattering property and strength, a manufacturing method therefor, and a magnetic disk using the aluminum alloy substrate for a magnetic disk.SOLUTION: There are provided an aluminum alloy substrate for a magnetic disk consisting of an aluminum alloy containing Fe:0.05 to 3.00 mass%, Zr:0.01 to 0.50 mass% and the balance Al with inevitable impurities, in which distribution density of an Al-Zr-based intermetallic compound having the longest diameter of 1 μm or more of 1/mmor less, a manufacturing method therefor, and a magnetic disk having an electroless Ni-P plating treatment layer and a magnetic substance layer thereon on a surface of the aluminum alloy substrate for a magnetic disk.SELECTED DRAWING: Figure 1 【課題】良好なフラッタリング特性と強度を有する磁気ディスク用アルミニウム合金基板及びその製造方法、ならびに、この磁気ディスク用アルミニウム合金基板を用いた磁気ディスクを提供する。【解決手段】Fe:0.05〜3.00mass%、Zr:0.01〜0.50mass%を含有し、残部Al及び不可避不純物からなるアルミニウム合金からなり、1μm以上の最長径を有するAl−Zr系金属間化合物の分布密度が1個/mm2以下であることを特徴とする磁気ディスク用アルミニウム合金基板及びその製造方法、ならびに、当該磁気ディスク用アルミニウム合金基板の表面に、無電解Ni−Pめっき処理層とその上の磁性体層が設けられている磁気ディスク。【選択図】図1
Bibliography:Application Number: JP20180131836