STUDY ON THE RHEOLOGICAL BEHAVIOR OF THE SLURRIES OF Al2O3/ NiAl COMPOSITE CERAMICS
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Abstract
The present paper deals with a primary study on the dispersion behavior of Al2O3 /NiAl slurries. The experiments are shown as follows: the zeta potential of both Al2O3 and NiAlparticles reaches the highest point in a slurry with respect to pH> 10. 6. For Al2O3 slurries with a solid content higher than 40 vol% , the optimum pH range is 11~12; the optimum dispersant contents of 40 vol% , 50 vol% and 60 vol% slurries are 0. 6 wt% , 2. 8 wt% and 8. 0 wt% respectively.For NiAl slurries with a solid content less than 30 vol% , the optimum pH range is 9~11; the optimum dispersant content is 0. 5 wt% . The slurry with 50 vol% ( Al2O3 / NiAl-20) exhibits excellent dispersion behavior under the best dispersing conditions.
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