ALUMINUM ALLOY SUBSTRATE FOR MAGNETIC DISK, AND MAGNETIC DISK USING SAME

An aluminum alloy substrate for magnetic disks, including an aluminum alloy containing: 1.0 to 6.5 mass% of Mg; and the balance consisting of Al and unavoidable impurities, in which the distribution of Si-K-O-based particles with a longest diameter of 1 ?m or more adhering to the surface from the su...

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Bibliographische Detailangaben
Hauptverfasser:	HATAKEYAMA Hideyuki, KUMAGAI Wataru, KITAWAKI Kotaro, SAKAMOTO Ryo
Format:	Patent
Sprache:	eng
Schlagworte:	ALLOYS CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS ANDNON-FERROUS ALLOYS CHEMICAL SURFACE TREATMENT CHEMISTRY COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATIONOR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY IONIMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL COATING MATERIAL WITH METALLIC MATERIAL COATING METALLIC MATERIAL DIFFUSION TREATMENT OF METALLIC MATERIAL FERROUS OR NON-FERROUS ALLOYS INFORMATION STORAGE INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORDCARRIER AND TRANSDUCER INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION INGENERAL METALLURGY PHYSICS SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THESURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION TREATMENT OF ALLOYS OR NON-FERROUS METALS
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Beschreibung
Zusammenfassung:	An aluminum alloy substrate for magnetic disks, including an aluminum alloy containing: 1.0 to 6.5 mass% of Mg; and the balance consisting of Al and unavoidable impurities, in which the distribution of Si-K-O-based particles with a longest diameter of 1 ?m or more adhering to the surface from the surrounding environment is equal to or less than one particle /6,000 mm2; and in which the distribution of Ti-B-based particles with a longest diameter of 1 ?m or more present on the surface is equal to or less than one particle /6,000 mm2, and a magnetic disk using the aluminum alloy substrate for magnetic disks.