XU Tan, LIU Wenyan, LIU Lu, XIAO Jianzhong
(State Key Laboratory of Materials Processing and Die & Mold Technology, School of Materials Science and Engineering, Huazhong
University of Science and Technology, Wuhan 430074, Hubei, China)
Abstract: Ammonium polyacrylate (PAA-NH4) and polyvinylpyrrolidone (PVP) were used as dispersants for the preparation of ZrO2 aqueous suspensions. The effect of single dispersant, mixing dispersants and addition mode on the rheology of ZrO2 aqueous suspensions was investigated by viscosity measurement. Then the adsorption of dispersants on the particle surface and the dispersion mechanism were briefly discussed by FTIR. The results showed that the solid content of 20vol.% and pH 9.0 of 3YSZ suspensions with co-addition of 1wt.% PAANH 4 and 1wt.% PVP obtained much lower viscosity, and there may be complexation between PAA-NH4 and PVP.
Key words: addition mode; zirconia suspension; rheology; dispersion mechanism