Preparation of Si_3N_4 Slurry with α-Si_3N_4 Whiskers for Tape Casting

In this paper,the influence of sintering aids,the dispersant and the binder for ceramic tape casting slurry with α-Si3N4 whiskers was investigated by analyzing the parameters of viscosity and ζ-potential.The results of the experiments show that the isoelectric point of Si3N4 slurry is at pH 4.3 and the optimal value of ζ-potential for tape casting is about at pH 11.The addition of the dispersant can make the isoelectric point of silicon nitride slurry move ahead,and make the slurry become better.The optimal value of the dispersant is about between 1.9%-2.1%.The silicon nitride slurry for tape casting with certain content of solid phase,good fluidity and stability was prepared.The film has excellent flexility.