Abstract
The authors developed “Dynamic Friction Polishing (DF polishing) Method” utilizing a thermochemical reaction between a diamond workpiece and a metal. This method enables high efficiency abrasive-free polishing of single crystal and polycrystalline diamonds (PCD) by simply pressing them against a stainless steel (SUS304) disc rotating at a high peripheral speed (VS>2500m/min). In the authors’ previous paper, a top of the diamond test piece (0.6mm×0.6mm, (100) plane) was removed at a rate of 2.6mm/min (0.94mm3/min) under the polishing condition of sliding speed VS=4000m/min, loading pressure P=130MPa and polishing time t=10s. A bottleneck for practical use of this method is a high pressure over 100MPa required for pressing a diamond workpiece against a rotating stainless steel disc. In this paper, a high efficiency tool was manufactured by electro-spark deposition of highly reactive special metals on a base disc tool. Among various reactive metals Nb and W brought very high efficiency in the polishing of a single crystal diamond.
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