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Co-Dispersion Behavior of ZrB₂-SiC-B₄C-C Powders with Polyethyleneimine
Jie Yin1,2, Jian Chen3, Xuejian Liu4
1State Key Laboratory of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China. yinjie19860810@gmail.com.
Abstract:
The aqueous dispersion behavior of ZrB₂, SiC powders with B₄C and C as sintering aids was investigated. Well co-dispersed suspension can be obtained in acidic solutions in presence of polyethyleneimine (PEI). The adsorption of PEI on the powder surface was measured by thermal gravimetric (TG) analysis. Rheological measurements displayed the effect of dispersant on the flow behavior of as-prepared slurries. An optimum condition was obtained with 1 wt % PEI. The viscosity of 40 vol % ZrB₂-SiC-B₄C-C (ZSBC) suspension at 100 s-1 was as low as 0.74 Pa·s, which was suitable for aqueous processing.

