Abstract
Flame-front propagation in a matrix of compacted Ti and C particles is studied experimentally, in relation to fundamental research on self-propagating high-temperature synthesis (SHS). The effects of mixture ratio, diameters of particles, relative density, and degree of dilution on burning velocity are investigated. Burning velocity has been defined as the flame-front velocity normal to its surface through the adjacent unburned condensed medium. Results show that there exist flammability limits, over which flame-front propagation occurs, and outside of which the flame cannot be self-sustained. The diameter of carbon particles is found to exert great influence on the burning velocity, while that of Ti particles presents no marked effects when particle sizes are smaller than the thickness of the reaction zone. Dilution with the combustion product is also shown to be effective in controlling the burning velocity although there exists a dilution limit beyond which the flame front ceases to propagate.
