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Reaction Injection Molding of Silica-Alumina Mixtures Using Heterocoagulation

  • Vijay V. Pujar (a1), James D. Cawley (a1), Ping Hu (a2) and L. James Lee (a2)

Abstract

A colloidal processing technique based on the heterocoagulation of selected ceramic oxide systems, and analogous to reaction injection molding of polymers, is described. Commercial colloidal silica and boehmite sols, which have oppositely charged particles in the pH range 2.0-9.0, and mixtures of these suspensions with micron sized oxide powders, have been used to determine whether a liquid to solid transformation could be induced when the two materials are simultaneously injected at high velocities into a mold cavity. Rheological changes have been measured as a function of relative flow rates of the two suspensions, solids loading and oscillatory frequency. Viscosity is observed to increase by as much as six orders of magnitude under optimized conditions.

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Reaction Injection Molding of Silica-Alumina Mixtures Using Heterocoagulation

  • Vijay V. Pujar (a1), James D. Cawley (a1), Ping Hu (a2) and L. James Lee (a2)

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