Aluminum alloy disc blank for magnetic disc and magnetic disc

Aluminum alloy disc blank for magnetic disc and magnetic disc

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 i...

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Bibliographische Detailangaben
Hauptverfasser: Kitawaki, Kotaro, Nakamura, Toshihiro, Yamada, Ryohei, Todo, Shinpei, Kumagai, Wataru, Hatakeyama, Hideyuki, Sakamoto, Ryo
Format: Patent
Sprache:eng
Schlagworte:
INFORMATION STORAGE
INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORDCARRIER AND TRANSDUCER
PHYSICS
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Zusammenfassung: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.