ALUMINUM ALLOY SUBSTRATE FOR MAGNETIC DISK AND MANUFACTURING METHOD THEREOF, ALUMINUM ALLOY BASE FOR MAGNETIC DISK AND MANUFACTURING METHOD THEREOF, AND MAGNETIC DISK AND MANUFACTURING METHOD THEREOF

• Main Authors: HATAKEYAMA HIDEYUKI, YONEMITSU MAKOTO, KITAWAKI KOTARO, MURATA TAKUYA, SAKAMOTO RYO, OTA YUKI
• Format: Patent
• Language: English; Japanese
• Published: 04.06.2020
• 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; INFORMATION STORAGE; INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORDCARRIER AND TRANSDUCER; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION INGENERAL; METALLURGY; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLICMATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASSC23 AND AT LEAST ONEPROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25; NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE; PHYSICS; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THESURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; TREATMENT OF ALLOYS OR NON-FERROUS METALS

To provide an aluminum alloy base for a magnetic disk having a small disk flutter, and a reduced abnormal portion on an electroless Ni-P plated surface, and a method for manufacturing the same, the aluminum alloy substrate for a magnetic disk for manufacturing the aluminum alloy base for the magnetic disk, and a method for manufacturing the same, and the magnetic disk using the aluminum alloy base for the magnetic disk and a method for manufacturing the same.SOLUTION: An aluminum alloy substrate for a magnetic disk, an aluminum alloy base for the magnetic disk and a magnetic disk using the same, and a manufacturing method thereof, which contain Fe: 0.1 to 3.0 mass%, Cu: 0.005 to 1.000 mass%, Zn: 0.005 to 1.000 mass%, is made of aluminum alloy with balance Al and unavoidable impurities, and have a maximum diameter of 10 μm or more on the outer peripheral surface, and is less than 200 pieces/mm.SELECTED DRAWING: Figure 1 【課題】ディスクフラッタが小さく、かつ、無電解Ｎｉ−Ｐめっき表面の異常部を低減した磁気ディスク用アルミニウム合基盤及びその製造方法、当該磁気ディスク用アルミニウム合基盤を製造するための磁気ディスク用アルミニウム合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基盤を用いた磁気ディスク及びその製造方法を提供する。【解決手段】Ｆｅ：０．１〜３．０ｍａｓｓ％、Ｃｕ：０．００５〜１．０００ｍａｓｓ％、Ｚｎ：０．００５〜１．０００ｍａｓｓ％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、外周面において、最長径１０μｍ以上の孔が２００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、これを用いた磁気ディスク用アルミニウム合金基盤及び磁気ディスク、ならびに、これらの製造方法。【選択図】図１