| 摘要 |
A surgical cutting instrument is formed by producing a cutting edge substrate or workpiece (10) of titanium or a titanium alloy. The substrate (10) is coated with a metalloid layer (12) and the whole is submerged in a bath (14) of liquid nitrogen (16). A laser (22) provides a beam (24) which scans the workpiece (10) and locally heats the surface sufficiently for the surface to melt and for the metalloid to diffuse into the substrate. As the beam passes, the surface is rapidly cooled so that an amorphous layer is formed. The treated substrate is lapped to remove any residual metalloid and to sharpen the cutting edge. |
