TITANIUM SUBSTRATE FOR MAGNETIC DISK

摘要

PURPOSE:To provide a Ti substrate usable for a magnetic disk for high density recording and reproduction and to further provide a Ti substrate obtd. by coating the above-mentioned Ti substrate with a nonmagnetic plating layer. CONSTITUTION:The objective Ti substrate for a magnetic disk has 0.0002-0.0060mum center line average roughness Ra and <=25mum diameter of pits in the surface. This Ti substrate is coated with a nonmagnetic plating layer in 0.09-5mum thickness to obtain the objective another Ti substrate for a magnetic disk. When this coated Ti substrate has <=30/100 in a checkers peeling test using a cellophane adhesive tape, it is optimum for use as a Ti substrate for a magnetic disk.