Ignition of Some Powder Mixtures of Metals with Teflon

Resumo

The dependence of ignition and the formation of the product structure in powder mixtures of W–Ti, Ti–B, Ti–Cu, and Ni–Al metals with Teflon (Tf) on the blending method and heating rate is studied. The increase in the heating rate is shown to affect slightly the ignition temperature of the Ti–B–Tf and Ti–Cu–Tf systems. However, it significantly changes the structure of the reaction products, leading to the formation of a large amount of melt. Compositions forming a large volume of gaseous products in the process of ignition and combustion fly out completely (W–Ti–Tf) or form a highly porous structure. Estimates of the activation energy of the process are obtained for the weakly energetic Ti–Cu–Tf system.