The Electrical Pre-Stress Effect on Field Dependent Conductivity of the Polyethylene and Carborundum Composite

The composite of polyethylene filled with carborundum powder shows the field dependent conductivity properties. During the compression moulding of the composite, a DC voltage, so called electrical pre-stress, is applied between especially designed electrodes in the mould. The field dependent conductivities of composites made with and without electrical pre-stress were compared though experiment. The results of experiment show that the function of the electrical pre-stress is same as to increase the filling content of the filler. And the possible mechanism of electrical pre-stress is discussed