Abstract
The Critical Powder Volume Concentration (CPVC) of compound for plastic forming was investigated. Prior to compounding ceramic powders with resins, the effect of the experimental conditions on the CPVC was examined using a torque rheometer and model liquids. It was found that there are optimum conditions for mixing speed and powder loading ratio. The CPVC obtained at the proper conditions is also dependent on the vehicle used for measurement; i.e. CPVCo (oleic acid)>CPVCw (ion-exchanged water)>CPVCk (kerosene). The critical powder volume concentration for the powder/thermoplastic resin system (CPVCM), which was determined by a flowability test, was from 0.85 to 0.90 of the CPVCo. Characteristic mixing torque-time curves appeared near the CPVCM. The microscopic observation of texture of compound suggested that the time-dependent odd behavior reflected the dynamic process wherein the particles were being dispersed into the melt with high viscosity.
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