Analysis on oxidation and diffusion wear of PCBN tool in cutting nickel base alloy

The wear mechanism of PCBN tool when cutting nickel-based alloy was studied by cutting experiments.The difference of the reaction mechanism of oxidative wear on the rake face and flank face of the tool was analyzed by the Gibbs free energy function method.The main oxidation reaction equation of oxidative wear was obtained.The solubility of boron nitride in different elements of nickel-based alloy was calculated by thermodynamic dissolution theory model.The difference of the mechanism of diffusion process between rake face and flank face was obtained.The results show that both the rake face and flank face of the tool have serious oxidation wear and diffusion wear.Diffusion and dissolution of elements increase the occurrence of diffusion wear.