Effect of Nitrogen Impurity on Wear Rate of Single Point Diamond Cutting Tool

Abstract

Effect of nitrogen impurity on thermo-chemical wear properties of single point diamond cutting tools in turning of iron and nickel were analyzed using ab-initio molecular dynamics calculation. The results of the analyses show that the substitutional nitrogen atoms weaken the bond strength of carbon atoms on diamond surface in contact with iron and nickel. The results suggest that the wear rate of type Ib diamond is larger than that of type IIa. An erosion test and cutting test also show that the wear rate of diamond tools of type Ib are higher than those of type IIa.