Patent ID: 7909949

Claim:
A surface processing method for a sputtering target, comprising the steps of: preparing a target surface of a sputtering target containing at least Co, Cr, Pt and B by melting, casting and rolling in which intermetallic compounds, oxides, carbides, carbonitrides and other substances without ductility exist in a highly ductile matrix phase of said target at a volume ratio of 1 to 50%, said substances without ductility being of a size in which an average particle diameter is at least 0.5 to 50 μm, a Vickers hardness of said highly ductile matrix phase being 400 or less, a Vickers hardness of said substances without ductility being 400 or more, and a hardness difference thereof being at least 1.5 times; preliminarily subjecting said target to primary processing of cutting work by cutting a thickness of 1 mm to 10 mm from said target surface; and then subsequently finish processing said target, said finishing processing step consisting of polishing a thickness of 1 μm to 50 μm from said target surface with sandpaper or a grindstone having a rough abrasive grain size of #80 to #400 after said primary processing such that surface defects of 10 μm or more resulting from machine work do not exist.