Substrate for magnetic recording medium, magnetic recording medium, hard disk drive
The invention provides a substrate for a magnetic recording medium, the magnetic recording medium, and a hard disk drive. The present invention provides a substrate for a magnetic recording medium inwhich bulges are not easily formed on a surface thereof by a physical impact in a size for a 2.5-inch...
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| creator | YUKIMATSU KOJI YOKOYAMA SHO MACHIDA HIROYUKI |
| description | The invention provides a substrate for a magnetic recording medium, the magnetic recording medium, and a hard disk drive. The present invention provides a substrate for a magnetic recording medium inwhich bulges are not easily formed on a surface thereof by a physical impact in a size for a 2.5-inch type hard disk drive, and a width of displacement caused by fluttering is small. The substrate fora magnetic recording medium includes an Al alloy substrate and a Ni alloy plating film formed on a surface of the Al alloy substrate, has a diameter of 54 to 70 mm, and a disk shape having a hole whose inner diameter ranges from 19 to 26 mm in the center thereof. The Al alloy substrate has a Young's modulus (E) of 74 GPa or more, a density Rho of 2.75 g/cm3 or less, and a ratio (E/Rho) of 27 or more between the Young's modulus (E) and the density (Rho). The Ni alloy plating film has a thickness of 4 to 7 mum, and when an indentation is formed by pressing a diamond indentor whose tip has a square pyramid shape against |
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The present invention provides a substrate for a magnetic recording medium inwhich bulges are not easily formed on a surface thereof by a physical impact in a size for a 2.5-inch type hard disk drive, and a width of displacement caused by fluttering is small. The substrate fora magnetic recording medium includes an Al alloy substrate and a Ni alloy plating film formed on a surface of the Al alloy substrate, has a diameter of 54 to 70 mm, and a disk shape having a hole whose inner diameter ranges from 19 to 26 mm in the center thereof. The Al alloy substrate has a Young's modulus (E) of 74 GPa or more, a density Rho of 2.75 g/cm3 or less, and a ratio (E/Rho) of 27 or more between the Young's modulus (E) and the density (Rho). The Ni alloy plating film has a thickness of 4 to 7 mum, and when an indentation is formed by pressing a diamond indentor whose tip has a square pyramid shape against</description><language>chi ; eng</language><subject>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 ; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUSMETALS OR ALLOYS ; INFORMATION STORAGE ; INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORDCARRIER AND TRANSDUCER ; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION INGENERAL ; MAKING METAL MALLEABLE BY DECARBURISATION, TEMPERING OR OTHERTREATMENTS ; METALLURGY ; METALLURGY OF IRON ; MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS ; PHYSICS ; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THESURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION ; TREATMENT OF ALLOYS OR NON-FERROUS METALS</subject><creationdate>2020</creationdate><oa>free_for_read</oa><woscitedreferencessubscribed>false</woscitedreferencessubscribed></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktohtml>$$Uhttps://worldwide.espacenet.com/publicationDetails/biblio?FT=D&date=20200707&DB=EPODOC&CC=CN&NR=111383668A$$EHTML$$P50$$Gepo$$Hfree_for_read</linktohtml><link.rule.ids>230,308,778,883,25551,76302</link.rule.ids><linktorsrc>$$Uhttps://worldwide.espacenet.com/publicationDetails/biblio?FT=D&date=20200707&DB=EPODOC&CC=CN&NR=111383668A$$EView_record_in_European_Patent_Office$$FView_record_in_$$GEuropean_Patent_Office$$Hfree_for_read</linktorsrc></links><search><creatorcontrib>YUKIMATSU KOJI</creatorcontrib><creatorcontrib>YOKOYAMA SHO</creatorcontrib><creatorcontrib>MACHIDA HIROYUKI</creatorcontrib><title>Substrate for magnetic recording medium, magnetic recording medium, hard disk drive</title><description>The invention provides a substrate for a magnetic recording medium, the magnetic recording medium, and a hard disk drive. The present invention provides a substrate for a magnetic recording medium inwhich bulges are not easily formed on a surface thereof by a physical impact in a size for a 2.5-inch type hard disk drive, and a width of displacement caused by fluttering is small. The substrate fora magnetic recording medium includes an Al alloy substrate and a Ni alloy plating film formed on a surface of the Al alloy substrate, has a diameter of 54 to 70 mm, and a disk shape having a hole whose inner diameter ranges from 19 to 26 mm in the center thereof. The Al alloy substrate has a Young's modulus (E) of 74 GPa or more, a density Rho of 2.75 g/cm3 or less, and a ratio (E/Rho) of 27 or more between the Young's modulus (E) and the density (Rho). 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The present invention provides a substrate for a magnetic recording medium inwhich bulges are not easily formed on a surface thereof by a physical impact in a size for a 2.5-inch type hard disk drive, and a width of displacement caused by fluttering is small. The substrate fora magnetic recording medium includes an Al alloy substrate and a Ni alloy plating film formed on a surface of the Al alloy substrate, has a diameter of 54 to 70 mm, and a disk shape having a hole whose inner diameter ranges from 19 to 26 mm in the center thereof. The Al alloy substrate has a Young's modulus (E) of 74 GPa or more, a density Rho of 2.75 g/cm3 or less, and a ratio (E/Rho) of 27 or more between the Young's modulus (E) and the density (Rho). The Ni alloy plating film has a thickness of 4 to 7 mum, and when an indentation is formed by pressing a diamond indentor whose tip has a square pyramid shape against</abstract><oa>free_for_read</oa></addata></record> |
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| language | chi ; eng |
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| subjects | 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 GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUSMETALS OR ALLOYS INFORMATION STORAGE INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORDCARRIER AND TRANSDUCER INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION INGENERAL MAKING METAL MALLEABLE BY DECARBURISATION, TEMPERING OR OTHERTREATMENTS METALLURGY METALLURGY OF IRON MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS PHYSICS SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THESURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION TREATMENT OF ALLOYS OR NON-FERROUS METALS |
| title | Substrate for magnetic recording medium, magnetic recording medium, hard disk drive |
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