ALUMINUM ALLOY BLANK FOR MAGNETIC DISK AND MANUFACTURING METHOD THEREFOR, MAGNETIC DISK USING ALUMINUM ALLOY BLANK FOR MAGNETIC DISK AND MANUFACTURING METHOD THEREFOR

• Main Authors: YONEMITSU MAKOTO, FUJII YASUO, KITAWAKI KOTARO, NAKAYAMA KEN, OTA YUKI
• Format: Patent
• Language: English; Japanese
• Published: 27.02.2020
• 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; 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 blank for magnetic disk having smooth plating surface and a manufacturing method therefor, and a magnetic disk and a manufacturing method therefor.SOLUTION: There is provided an aluminum alloy blank for magnetic disk consisting of an aluminum alloy containing Mg:3.0 to 8.0 mass%(hereafter "%"), Cu:0.003 to 0.150%, Zn:0.05 to 0.60%, Cr:0.010 to 0.300%, Mn:0.001 to 0.500%, Fe:0.001 to 0.030%, Si:0.001 to 0.030%, Be:0.00001 to 0.00200%, and the balance Al with inevitable impurities, and having difference of flatness before and after a heating treatment of 300°C×1 hr. within 168 hr. from detachment after compression annealing of 2.0 μm or less, a manufacturing method therefor, and a magnetic disk using the aluminum alloy blank for magnetic disk.SELECTED DRAWING: Figure 1 【課題】めっき表面が平滑な磁気ディスク用アルミニウム合金ブランク及びその製造方法、ならびに、磁気ディスク及びその製造方法を提供する。【解決手段】Ｍｇ：３．０〜８．０ｍａｓｓ％（以下、「％」）、Ｃｕ：０．００３〜０．１５０％、Ｚｎ：０．０５〜０．６０％、Ｃｒ：０．０１０〜０．３００％、Ｍｎ：０．００１〜０．５００％、Ｆｅ：０．００１〜０．０３０％、Ｓｉ：０．００１〜０．０３０％、Ｂｅ：０．００００１〜０．００２００％、を含有し、残部Ａｌ及び不可避的不純物からなるアルミニウム合金からなり、加圧焼鈍後の剥離から１６８時間以内において、３００℃×１時間の加熱処理前後の平坦度の差が２．０μｍ以下である磁気ディスク用アルミニウム合金ブランク及びその製造方法、ならびに、当該アルミニウム合金ブランクを用いた磁気ディスク。【選択図】図１