Study on the Effect of Value of the Current on Synthesis of W-C-Co Composites under an Electric Field

Abstract

Using Gleele-1500D thermal simulation instrument, the effect of value of the current on synthesis of W-C-Co composites was investigated. It was shown that the nature of combustion products depended on the magnitude of the current intensity and the electric field was not only providing the Joule heat for a compact, but also accelerating the diffusion among atoms in the synthesis process. X-ray and microscopic analysis of combustion products suggest that the solid state reaction takes place at a relatively lower temperature by passing through the samples with current intensities between 20000 A and 30000 A. Moreover, as the current increases, the TTE becomes lower. At the same time, the relative strength of WC diffraction peaks in XRD diagram increases while that of W2C decreases.