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Reaction Injection Molding of Silica-Alumina Mixtures Using Heterocoagulation

Published online by Cambridge University Press:  25 February 2011

Vijay V. Pujar ,
James D. Cawley ,
Ping Hu  and
L. James Lee
Vijay V. Pujar
Affiliation:
Dept. of Materials Science and Engineering, andThe Ohio State University, Columbus, OH 43210.
James D. Cawley
Affiliation:
Dept. of Materials Science and Engineering, andThe Ohio State University, Columbus, OH 43210.
Ping Hu
Affiliation:
Dept. of Chemical Engineering, The Ohio State University, Columbus, OH 43210.
L. James Lee
Affiliation:
Dept. of Chemical Engineering, The Ohio State University, Columbus, OH 43210.
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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.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 249: Symposium Q – Synthesis and Processing of Ceramics: Scientific Issues , 1991 , 317
Copyright
Copyright © Materials Research Society 1992

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References

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