| || Burn Rate Studies of a Titanium Based Pyrotechnic Smoke Composition
Author : Rajendra, A.G.;Kartha, C.B.;Babu, V.V.
Source : Defence Science Journal ; Vol:50(2) ; 2000 ; pp 199-206
Subject : 662.3 Propellants;66 Chemical Technology
Keywords : Pyrotechnic smoke compositions;Burn rate
Abstract : A pyrotechnic smoke composition producing titanium tetrachloride (TiCl/sub 4/) as one of the major reaction products has been studied. The composition consists of titanium metal powder, hexachloroethane (C/sub 2/Cl/sub 6/), potassium perchlorate (KClO/sub 4/) and titanium dioxide (TiO/sub 2/)/zinc oxide (ZnO). Pyrotechnic aluminium was added in small percentages to tailor the burn rate. The effect of percentage variation of KClO/sub 4/, TiO/sub 2/ ZnO, titanium and aluminium on the burn rate has been investigated. While, the burn rate decreases as the percentage of TiO/sub 2/ ZnO increases, it reaches a maximum as the percentage of KClO/sub 4/ is successively increased, but falls off on further increase. This maximum has been first fixed by studying the tricomponent system containing no oxide. It corresponds to 25 percent KClO/sub 4/. Successive additions of C/sub 2/Cl/sub 6/ and ZnO in 1:3 mol ratio or C/sub 2/Cl/sub 6/ and TiO/sub 2/ in 2:3 mol ratio lead to cooler compositions that burn smoothly without much flame and at lower temperatures. Compositions containing less than 5 per cent titanium is difficult to ignite. Similarly, addition of excess titanium or small quantities of aluminium to the composition is found to increase the burn rate.