Preparation method of ceramic slurry capable of high solid content and good fluidity

Abstract

The invention discloses a preparation method of ceramic slurry with high solid content and good mobility. First weighing certain quality alumina powder and putting in boiling flask with temperature control and stirring device; then weighing polyacrylic acid dispersant according 0.8 to 1.8% of dry powder quality, weighing deionized water according to the solid-phase volume percentage of actual needed prepared slurry and preparing dispersant water solution, adjusting the pH to 2.5~6.5, heating to 60 ~ 95 degree C; finally, mixing the dispersant water solution and the powder body, putting it in ultrasonic instrument 5 ~ 10 mins at constant temperature 60-95DEG C, adsorbing 2~12 hours in the constant temperature stirring status after ultrasound action then preparing the slurry product. The invention reduces the structural water of solid particles surface of slurry through heating, increases the free water amount in slurry, reduces the slurry viscosity, increases the chain segment density of dispersant through temperature, increases the repelling force position energy between particles to making the slurry keep uniform and stable performance while the flowability is increased.

Description

technical field

[0001] The invention relates to a high-tech ceramic material wet processing technology, in particular to a preparation method of ceramic slurry with high solid content and good fluidity. Background technique

[0002] Wet forming is a common forming method for high-tech ceramic materials. Wet forming is highly valued by material workers for its advantages of high green body density, small pores, narrow pore size distribution, and the ability to form ceramic devices with complex shapes in net dimensions. The requirements of wet molding process for ceramic slurry mainly include three aspects: first, high solid phase volume fraction φ > 50%, that is, high solid content, the higher the solid phase volume fraction, the greater the density of the green body after molding, and the green body The smaller the shrinkage after sintering, the better the effect of net size molding; the second is good fluidity, good fluidity of slurry, that is, low viscosity characteris...