PDC钻头复合片真空扩散焊接头的显微分析

Microanalysis and Calculation of Diffusion Coefficient for the Low-Temperature Diffusion Welding of PDC Butt-Joints

The diffusion process in the butt-joints between PDC and stud under low-temperature diffusion welding is studied and the relationship between the diffusion distance of the elements on both sides. of the interface or the interlayer thickness and the shearing strength of the welds is obtained.By the electron microscopy,the diffusion process of Ni, Co,W,C elements on the interface is investigated. The diffusion equations of Ni and Co are derived by using the multi-factor regression method.The diffusion coefficients of Ni and Co have been calculated and analysised by the derivation and integration of the diffusion equations. The multi-factor regression method is proved more reliable, exact and simple than the diagram-integration method.