Research on Thermal Damage of Polycrystalline Diamond Tools During Hi-frequency Induction Brazing
Based on the engineering practice,the brazing experiment of polycrystalline diamond(PCD)tools is de-signed.The form and mechanism of thermal damage are studied.The thermal damage forms of PCD tools include pit,bulge and crack,of which pit is the most preponderant thermal damage form.Graphitization of PCD tools doesn't occur during bra-zing.Part of cobalt and its oxides fall off,the bad wettability between cobalt oxides and diamond,and welding tensile stress result in thermal damage.The results show that the increase of brazing temperature and constant time exacerbate the degree of thermal damage.A method for evaluating the degree of PCD tools'thermal damage which image recognition pit area meth-od based on machine learning is proposed,and it can quantitatively characterize the degree of thermal damage.
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