Chapter 3. Effects of Self-Propagating Synthesis Reactant Compact Character on Ignition, Propagation and Resultant Microstructure
- William Smothers
Published Online: 27 MAR 2008
Copyright © 1986 The American Ceramic Society, Inc.
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
- Published Online: 27 MAR 2008
- Published Print: 1 JAN 1986
Print ISBN: 9780470374672
Online ISBN: 9780470320341
- densities propagation;
- enhancing diffusion
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.