Fig.3 and Fig.4 show the effect of

Fig.3 and Fig.4 show the effect of reshaping technology on apparent viscosity of SiC slurry. The apparent viscosity of the slurry make of reshaping fine powders are only 1100mPa.s at the shear rate of 0.3 r.min-1, as shown in Fig.3. The initial and reshaping powders exhibit the same shear-shinning charactenistic, but the apparent viscosity of initial fine powders increased more obvious than reshaping fine powders when the shear rate lower than 6 r.min-1. According to Fig.4, when the weight ratio of fine powders and coarse powders were 1:1, the apparent viscosity of the system with reshaping fine powders and reshaping coarse powders is the lowest; secondly it is the system of reshaping fine powders and initial coarse powders; thirdly it is the system of initial fine powders and reshaping coarse powders;the apparent viscosity of the system with initial fine powders and initial coarse powders is the highest. As a result, comparing to coarse powders, the reshaping technology of the fine powders gives the greatest contribution to the decrease of the apparent viscosity of the slurry system and the increase of green body density. The fine powders form the continuous phase in the slurry system, the coarse powders are isolated by the fine powders, the reshaping technology of the fine powders is the key factor that lead to the close packing of the particles and higher volume density of the green body.