Rheological Characteristics of Feedstock for Sialon Ceramic Injection Molding

The viscosities of the feedstock using for Sialon ceramic injection molding at different temperatures and the rates of shear strain were investigated by capillary rheometer.The rheological property of the feedstock was analyzed.The sensitivity of the viscosity on the rate of shear strain and the temperature was studied,the effect of injection temperature on the quality of green parts was also discussed.The results show that the feedstock showed non-Newtonian pseudoplastic rheological behavior at high temperatures,and had good moldability.The non-Newtonian index (n) at different temperatures was determined to be less than 1.The minimal n value of feedstock was 0.393 2 at 130 ℃,and the best injection molding quality and the rheological stability could be obtained.