Rheological Property and Fluid Constitutive Relationship of Medium-density W-Ni-Fe Feedstock in Metal Injection Molding Process

Rheology properties of three kinds of W-Ni-Fe feedstock with different densities (10,14,17 g·cm-3 respectively after sintered) were studied to determine the effect of shear rate,temperature and tungsten-nickel ratio.Results suggest that W-Ni-Fe feedstock is a kind of pseudo-plastic fluid.The apparent viscosity of the W-Ni-Fe feedstock declined as shear rate increases or temperature rised.Non-Newtonian exponent increased as temperature rised.The tungsten-nickel feedstock became more sensitive to shear rate and temperature when the ratio of tungsten increased.In addition,fluid constitutive relationship of the feedstock was derived through the non-linear fit technology.