Abstract：Composition,crystal form,particle size and surface properties of the imported and domestic silicon carbide powders were characterized by XRD,EDS,TEM and particle size test.The results show that two kinds of powders have similar composition and microscopic structure.But their slurries show obviously different rheological properties.The imported samples can obtain stable suspension with solid volume fraction of 55% with low viscosity,while the largest solid volume fraction of the domestic powders is 40% which appears shear thickening phenomenon.Microscopic difference of surface properties results in different rheological properties of slurries.

Keywords：silicon carbide powders;surface property;rheological property;solid content