Base for magnetic recording medium

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United States of America Patent

PATENT NO 9875765
SERIAL NO

15271359

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Abstract

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A base for a magnetic recording medium includes, a substrate made of an Al alloy, and a film made of a NiP-based alloy and provided on the substrate. The Al alloy of the substrate includes Mg in a range of 0.2 mass % to 6 mass %, Si in a range of 3 mass % to 17 mass %, Zn in a range of 0.05 mass % to 2 mass %, and Sr in a range of 0.001 mass % to 1 mass %. An average grain diameter of Si grains in an alloy structure of the substrate is 2 μm or less. The film has a thickness of 10 μm or greater. The substrate has an outer diameter of 53 mm or greater, a thickness of 0.9 mm or less, and a Young's modulus of 79 GPa or higher.

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Patent Owner(s)

  • SHOWA DENKO K.K.

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Kobayashi, Tomoya Tochigi, JP 17 505
Murase, Isao Tochigi, JP 16 546
Sugimoto, Kiminori Osaka, JP 4 27
Yukimatsu, Koji Tochigi, JP 7 12

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