| 摘要 |
PURPOSE:To smooth a cutting edge and satisfy a sharpened cutting quality and a stable cutting edge by irradiating ions to a tool material after the formation of a cutting edge thereon via machining and exposure to heat treatment at 500-630k in the atmospheric pressure or 500-1,500k in vacuum. CONSTITUTION:Ions accelerated at a high speed are irradiated on the surface of a diamond, thereby dispelling carbon atoms within crystal structure near the surface and increasing the number of holes. In this case, the ions of relatively small atomic radius are utilized, including hydrogen, helium, neon, argon and carbon ions. And as irradiation conditions, it is suitable to take an acceleration voltage at 1-10,000kV, and an irradiation quantity at 10<13>-10<19>/cm<2>. Then, the diamond surface is smoothed by heat treatment. In this case, the heating condition of 500-630k under the atmospheric pressure and 500-1,500k in vacuum enables obtaining a good quality and sharp cutting edge and high stability allowing the maintenance of such a cutting edge for a long time.
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