Study on the two and three-parameter working stability regions of 3Y-TZP suspension

摘要

We determined the variation tendency of viscosity (eta) at various solids loading (phi) for 3Y-TZP suspension as a function of dispersant concentration (Cw) using viscosity measurement, measured the diameter of particles as a function of Cw in very dilute suspension using light scattering method, and obtained the surface features of the sediment of suspension with different Cw using SEM. We also discussed the influence of the microstructure of adsorbed polymer layers on particles and their interactions in the dispersing medium on the stability of suspension. Then two different stable states and two different unstable states for 3Y-TZP suspension were given. Accordingly, the (Cw, eta), (Cw, phi), and (phi, eta) two-parameter, and (Cw, phi, eta) three-parameter stability maps were constructed. Based on the DLVO theory calculations, the dispersant concentration, particle distance (r), and interparticle potential energy (V_T) maps with various solids loading for 3Y-TZP aqueous suspension were also constructed. In (Cw, r) two-parameter coordinate system, the stable motion region map for particles was established. The Cw, phi, and V_(T,max) (the highest potential energy) surface of the potential barrier map was obtained through calculation and simulation on the basis of the surfaces of Cw, r, V_T maps introduced above. The (Cw, phi) two-parameter stability map was then obtained from the Cw, phi, V_(T,max) map. The results showed that this theoretical map can qualitatively prove the experimentally obtained results-the existence of different dispersed states of particles in suspension system and the variation tendency of suspension stability with changing each parameter-were reasonable.