ALUMINUM ALLOY SUBSTRATE FOR MAGNETIC DISK AND MANUFACTURING METHOD THEREFOR
PROBLEM TO BE SOLVED: To provide an aluminum alloy substrate for magnetic disk excellent in smoothness and strength of a plating surface.SOLUTION: There are provided an aluminum alloy substrate for magnetic disk consisting of an aluminum alloy containing Mg:4.5 to 10.0 mass% (hereafter %), Be:0.0000...
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Main Authors | , , , , , , |
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Format | Patent |
Language | English Japanese |
Published |
09.02.2017
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Subjects | |
Online Access | Get full text |
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Summary: | PROBLEM TO BE SOLVED: To provide an aluminum alloy substrate for magnetic disk excellent in smoothness and strength of a plating surface.SOLUTION: There are provided an aluminum alloy substrate for magnetic disk consisting of an aluminum alloy containing Mg:4.5 to 10.0 mass% (hereafter %), Be:0.00001 to 0.00200%, Cu:0.003 to 0.150%, Zn:0.05 to 0.60%, Cr:0.010 to 0.300%, Si:0.060% or less, Fe:0.060% or less and the balance Al with inevitable impurities, having content of Mg-based oxide of 50 ppm or less and (I/I)×(C)≤0.1000%, where (I) is maximum emission strength of Be in a surface depth direction by a glow discharge emission spectrochemical analysis device, (I) is average emission strength of Be in a base material inside of the aluminum alloy and (C)% is Be content and a manufacturing method therefor.SELECTED DRAWING: Figure 1
【課題】めっき表面の平滑性及び強度に優れる磁気ディスク用アルミニウム合金基板を提供する。【解決手段】Mg:4.5〜10.0mass(以下、%と記す)%、Be:0.00001〜0.00200%、Cu:0.003〜0.150%、Zn:0.05〜0.60%、Cr:0.010〜0.300%、Si:0.060%以下、Fe:0.060%以下を含有し、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、Mg系酸化物の含有量が50ppm以下であり、めっき前処理を施す前において、グロー放電発光分析装置による表面深さ方向におけるBeの最大発光強度を(IBe)とし、アルミニウム合金の母材内部におけるBeの平均発光強度を(Ibulk)とし、上記Be含有量を(CBe)%として、(IBe/Ibulk)×(CBe)≦0.1000%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及びその製造方法。【選択図】図1 |
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Bibliography: | Application Number: JP20160143017 |