Gasless mixture

Fast Burning Gasless Mixture, which contains CuO 80 Al (grained) 20%, is suitable as an incendiary. It develops high pressure on fast burning by sublimation of copper Ref W.A Show, "Development of an Incen-diaty Pellet , TCR-59, Technical Command, Army Chemical Center, Maryland (5 May, 1950)... 

Gasless Mixture 668/Mn Mn 10, Cu 30, Si 30 Pb02 30%. Pressure on heating of this mixture was developed by sublimation of metals Ref W.A. Show, Development of an Incendiary Pellet , Tech Command Army Chem Center, Md Kept TCR-59 (May 1950)... 

Gasless Mixture 668/Mn Mn 10, Cu 30, Si 30 Pfc02 Pressure on heating of this mixture... 

A gasless mixture that is relatively safe to process and to handle. It will burn under greatly diminished atmospheric pressure. Used with NC binder and added powdered glass, it adheres to the substratum and its ash continues to adhere for efficient fire transfer. Its efficacy can be increased by an increase in the percentage of boron and replacement of barium chromate by calcium chromate. 

R. H. Comyn, Diamond Ordnance Fuze Laboratories, Washington, D. C., Measurement of Particle Size of Components of Gasless Mixtures, Tech. Rept. 636 (1958). 

I.P. Borovinskaya, A New Class of Combustion Processes , Combustion Science Technology 10 (1975), 195—201. See also A.G. Merxhanov, Regularities and Mechanism of Combustion of Pyrotechnic Titanium Boron Mixtures , 4th Symposium, see Ref 148, See also V. Maslov et al, On Gasless Combustion Mechanism , FizikaGoreniaiVziyva 12, No 5... 

When a mixture of Fe203 powder and Zr powder is ignited, Fe203 acts as an oxidizer of Zr, similar to the oxidation of AL This reaction is exothermic and gasless, and is expressed by ... 

This reaction is highly exothermic without yielding gaseous products, i. e., it is a gasless reaction, and the adiabatic flame temperature is 3460 K at the stoichiometric mixture ratio. However, this reaction only occurs at high temperatures, above 2000 K. In order to initiate the combustion, a high heat input is needed for ignition. 

Note This is a "gasless" delay mixture - the burning rate increases as loading pressure increases. "Gassy" mixtures will show the opposite behavior. aReference 2. 

Contrary to the behavior expected for "gassy" mixtures, the rate of burning for gasless compositions is expected to increase (in units of grams reacting per second) as the eonsolidation pressure is increased. "Gasless" delays propagate via heat transfer... 

Burning behavior can therefore be summarized in two words homogeneity and confinement. An increase in either should lead to an increase in burning rate for most high-energy mixtures. Note, however, that "gasless" compositions do not show the dramatic confinement effects found for "gassy" compositions. 

Formulas 60, 68 69 are taken from Ref 44a, pp 280-81, where 60 is designated as "Gasless Ignition Mixture" and 68 8t 69 as "Highly Sensitive Ignition Mixtures" which can also be initiated by electricity Formulas 164, 165 etc are taken from Ref 57, pp 378-83... 

F33B. Gasless incendiary mixture Zr (200 mesh) 41.0, Fe203 (pigment grade, red) 49.0 "Superfloss" 10%... 

Composition and Properties of Gasless Ignition Mixtures Containing Zirconium. Z 18... 

Zr/Ni/BaCr04 /KG04 26./ 60 / 14 Zr/Ni/BaCr04/KC104 5/17/ 70.5 / 75 497 0.17 0.3-0.03 585,5 sec - As gasless delay mixture wide temperature stability wide range of delay time Variability impact sensitivity 56cm... 

The latter group above shows experimental mixtures representing the most modern trends in gasless delay compns... 

Ternary Mixtures of High Explosives , PATR 1380 (1943) 9) D. Hart, Gasless Powders... 

Delay compositions are mixtures of materials which, when pressed into delay tubes, react without evolution of gaseous products and thus ensure the minimum variation in the delay period. Examples of such mixtures are potassium permanganate with antimony lead dioxide or minium with silicium redox reactions with fluorides and other halides (- also Coruscatives and -+ delay gasless). 

Based on their analyses, and incorporation of additional details, we have outlined some general relationships for gasless combustion synthesis of materials from elements (type 1), as shown schematically in Fig. 3. Both characteristic features of the process, the combustion wave propagation velocity and maximum temperature, have maximum values when the composition of the green mixture corresponds to the most exothermic reaction for a given system (Fig. 3a). In gen-... 

The application of combustion theory to gasless synthesis processes is based on a comparison of the mass and thermal diffusivities in the solid reactant mixture. In these types of systems, the Lewis number is very small ... 

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