Chapter 56. Effect of Particulate Additions on the Rheological Properties of Polymer Based Slurry Mixtures and the Characteristics of Polymer Based Slurry Derived Preforms

  1. John B. Wachtman Jr.
  1. J. D. Kiser

Published Online: 26 MAR 2008

DOI: 10.1002/9780470314784.ch56

Proceedings of the 19th Annual Conference on Composites, Advanced Ceramics, Materials, and Structures - B: Ceramic Engineering and Science Proceedings, Volume 16, Issue 5

Proceedings of the 19th Annual Conference on Composites, Advanced Ceramics, Materials, and Structures - B: Ceramic Engineering and Science Proceedings, Volume 16, Issue 5

How to Cite

Kiser, J. D. (1995) Effect of Particulate Additions on the Rheological Properties of Polymer Based Slurry Mixtures and the Characteristics of Polymer Based Slurry Derived Preforms, in Proceedings of the 19th Annual Conference on Composites, Advanced Ceramics, Materials, and Structures - B: Ceramic Engineering and Science Proceedings, Volume 16, Issue 5 (ed J. B. Wachtman), John Wiley & Sons, Inc., Hoboken, NJ, USA. doi: 10.1002/9780470314784.ch56

Author Information

  1. NASA Lewis Research Center, Cleveland, OH 44135; M. Singh, NYMA Inc., Lewis Research Center Group, Cleveland, OH 44135

Publication History

  1. Published Online: 26 MAR 2008
  2. Published Print: 1 JAN 1995

ISBN Information

Print ISBN: 9780470375389

Online ISBN: 9780470314784

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Keywords:

  • limitations;
  • evaluate;
  • orifice;
  • variables;
  • consuming

Summary

Rheological properties of resin mixtures containing various amounts and types of carbon participates have been characterized with viscosity measurements. The mixtures evaluated in this study exhibited non-Newtonian behavior, and were characterized as pseudoplastic liquids or pseudoplastic liquids having a yield point. Thus, as shear rate was increased, the viscosity decreased. For each of the powders examined, increased additions of powder caused the viscosity to increase (at a given shear rate). Curing of these mixtures at room temperature caused their viscosities to increase with time. Thus, the effect of time (following preparation of the mixture) was identified as an important variable to monitor/control when performing viscosity tests on polymeric mixtures containing a strong acid catalyst. Specimens were fabricated by curing and pyrolyzing the mixtures to yield microporous carbon preforms, and then, melt infiltrating with silicon to form monolithic reaction-formed silicon carbide (RFSC). Mercury porosimetry and scanning electron microscopy were used to characterize the microstructure of the preforms. Carbon paniculate additions were observed to influence the preform morphology. Metallography revealed that the microstructures of the RFSC materials were dependent on the microstructures of the carbon preforms.