Abstract: Three kinds of Si-based slurries:(1)100wt%Si(2)5wt%Si_3N_4,95wt%Si(3)5wt% Si_3N_4,10wt%SiC,85wt% Si were synthesized.The rheological behaviors of Si-based slurries were investigated by changing additions of(C_2H_5O)_3PO and pH value.The results showed that the isoelectric point (IEP) of Si is around pH value of 3.1.The rheological behaviors of the slurries with different additions of(C_2H_5O)_3PO and at different pH could be significantly improved;the best content of (C_2H_5O)_3PO and the best pH were known respectively.

Key words: Si powder%slurry%rheological property%dispersant%pH value