Chapter 3. Effects of Self-Propagating Synthesis Reactant Compact Character on Ignition, Propagation and Resultant Microstructure

  1. William Smothers
  1. Roy W. Rice,
  2. George Y. Richardson,
  3. James M. Kunetz,
  4. Thomas Schroeter and
  5. William J. McDonough

Published Online: 27 MAR 2008

DOI: 10.1002/9780470320341.ch3

10th Annual Conference on Composites and Advanced Ceramic Materials: Ceramic Engineering and Science Proceedings, Volume 7, Issue 7/8

10th Annual Conference on Composites and Advanced Ceramic Materials: Ceramic Engineering and Science Proceedings, Volume 7, Issue 7/8

How to Cite

Rice, R. W., Richardson, G. Y., Kunetz, J. M., Schroeter, T. and McDonough, W. J. (2008) Effects of Self-Propagating Synthesis Reactant Compact Character on Ignition, Propagation and Resultant Microstructure, in 10th Annual Conference on Composites and Advanced Ceramic Materials: Ceramic Engineering and Science Proceedings, Volume 7, Issue 7/8 (ed W. Smothers), John Wiley & Sons, Inc., Hoboken, NJ, USA. doi: 10.1002/9780470320341.ch3

Author Information

  1. U.S. Naval Research Laboratory Washington, D.C. 20375–5000

Publication History

  1. Published Online: 27 MAR 2008
  2. Published Print: 1 JAN 1986

ISBN Information

Print ISBN: 9780470374672

Online ISBN: 9780470320341

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Keywords:

  • microstructure;
  • carbon;
  • densities propagation;
  • enhancing diffusion

Summary

Studies of reactions involving Ti to produce TiC, TiB2, TiC + TiB2, or 3TiB2 + 5Al2O3 ignited at one end of test plates showed that reactant powder compact densities were a major factor in the rate of reaction propagation along the plate, i.e., a maximum in propagation rate was observed at about 60 ± 10% theoretical density. At higher densities propagation rates not only decreased, but terminated due to self extinction in some cases or failed to even ignite and propagate, typically at ≥90% theoretical density. Both reactant particle size and shape can also affect results, i.e., compacts of large (200m̈m diameter) Ti particles, Ti flakes or foil, or wires failed to ignite or had slower propagation rates. Also, the ignition and propagation rates of carbon fiber tows infiltrated with titanium metal powders depended significantly on the local thermal conductivity. However, overall propagation rates for a given range of reactant compact microstructures increased with the heat of the reaction involved.