초록 ▼

A tungsten carbide surface is finished to an RMS surface roughness of about 25 nm (1.0 microinch) or less by abrasion using diamond grit particles. The tungsten carbide surface is abraded by a sequence of grit particle-containing abrasive members, such as abrasive films, pastes, or slurries, at leas

A tungsten carbide surface is finished to an RMS surface roughness of about 25 nm (1.0 microinch) or less by abrasion using diamond grit particles. The tungsten carbide surface is abraded by a sequence of grit particle-containing abrasive members, such as abrasive films, pastes, or slurries, at least one of the members having an average grit particle diameter of about 2 .mu.m or less. The finish is enhanced by oscillating the abrasive member back and forth over the tungsten carbide surface. A different speed is used for at least two consecutive films in the series, thereby generating scratches at different angles which can be distinguished. A superfinish, corresponding to a lack of visible scratches at 100.times. magnification, can be obtained by abrading the tungsten carbide surface with a diamond slurry or paste having grit particles with an average diameter of about 1 .mu.m or less.

대표청구항 ▼

[ What is claimed is:] [5.] A cylindrical article, comprising:a cylindrical substrate; anda surface layer on the cylindrical substrate, the surface layer having an RMS surface roughness of about 25 nm or less as determined by light scattering and a surface profile which varies by about .+-.0.013 mm

[ What is claimed is:] [5.] A cylindrical article, comprising:a cylindrical substrate; anda surface layer on the cylindrical substrate, the surface layer having an RMS surface roughness of about 25 nm or less as determined by light scattering and a surface profile which varies by about .+-.0.013 mm or less, wherein the surface layer comprises a tungsten carbide composition.