Chapter 12. Experimental Evaluation of the Mixing Process for the Preparation of Feedstock for Powder Injection Molding

  1. John B. Wachtman Jr.
  1. R. Raman1,
  2. W. Slike III1,
  3. R. M. German1 and
  4. C. I. Whitman2

Published Online: 26 MAR 2008

DOI: 10.1002/9780470314272.ch12

A Collection of Papers on Engineering Aspects of Fabrication of Ceramics: Ceramic Engineering and Science Proceedings, Volume 14, Issue 11/12

A Collection of Papers on Engineering Aspects of Fabrication of Ceramics: Ceramic Engineering and Science Proceedings, Volume 14, Issue 11/12

How to Cite

Raman, R., Slike, W., German, R. M. and Whitman, C. I. (1993) Experimental Evaluation of the Mixing Process for the Preparation of Feedstock for Powder Injection Molding, in A Collection of Papers on Engineering Aspects of Fabrication of Ceramics: Ceramic Engineering and Science Proceedings, Volume 14, Issue 11/12 (ed J. B. Wachtman), John Wiley & Sons, Inc., Hoboken, NJ, USA. doi: 10.1002/9780470314272.ch12

Author Information

  1. 1

    Department of Engineering Science and Mechanics Pennsylvania State University University Park, PA 16802

  2. 2

    SSI Management Consultants, Inc. Norwalk, CT 06850

Publication History

  1. Published Online: 26 MAR 2008
  2. Published Print: 1 JAN 1993

ISBN Information

Print ISBN: 9780470375280

Online ISBN: 9780470314272

SEARCH

Keywords:

  • polypropylene;
  • homogeneity;
  • rheomeby;
  • thermoplastic;
  • rheology

Summary

The mixing of feedstock for powder injection molding is investigated experimentally in a continuous twin-screw processor using a statistical design of experiments. Iron, tungsten, and alumina powders are used for the study, with a wax-based binder containing polypropylene and stearic acid as a dispersant. Three different techniques are used to evaluate the homogeneity of mixed feedstocks: binder burnout, torque rheometry, and capillary rheometry. Capillary rheometry was the best technique for homogeneity evaluation. Empirical correlations from a multiple correlation analysis of the data suggested an exponential dependence of viscosity on the machine variables. These results are explained in terms of the underlying physical principles.