Numerical Solution of a Direct 3D Electrostatic Resistivity Test of Green-State Metal Powder Compacts

摘要

Current research efforts have concentrated on developing an instrumentation approach to test green-state powder metal (P/M) compacts by exploiting the conductivity or resistivity variations in the samples under test [1]. A novel multi-pin sensor is used to inject current in various directions through an array of outer contacts, and a matrix of 7 by 7 pointed needles record the voltage response of the P/M sample. Initial tests with production samples as well as a few controlled samples have shown good sensitivity and the ability to detect flaws of various sizes [6].