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By A. W. Babister

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Ignition delay has been found to depend on both the partial pressure of 0 0 as well as the total pressure. 7. It was further suggested that AP decomposition contributes to ignition when the surrounding atmosphere contains less than 50-60$ 00. 18 Summerfield et al. found in their shock tube experiments that a surface temperature of 433 K is obtained in propellant ignition. They argued that at such a low surface temperature the TO of AP will not be significant because ignition occurs in a short time (

Consequently, an electron-transfer process in the presence of a catalyst has been suggested, followed by the decomposition of the NH* and CIO* to NHj, (\I2, 0 2 , C102, and ClO^. However, 67 68 K. KISHORE AND V. GAYATHRI Pearson and Button^? have invoked the same protontransfer mechanism for both catalyzed and uncatalyzed decomposition of AP. Studies on the e f f e c t of catalysts on AP de- composition by Inami and Wise 32 have led to the conclusions that CC plays a dual role in a propellant system by acting as an oxidation catalyst for MH, and other organic fuel binder molecules and as a decomposition catalyst for HC10,.

Data from high heating rate studies are presented and compared with results obtained from the more traditional, controlled tests described. Results from shock tube studies are also presented. The ignition behavior of HMX is presented showing that when the sample is subjected to an energy flux several events occur with time: heating and gasification of the sample, reaction of the pyrolysis products, ignition, and self-deflagration. The dependence of selfdeflagration rates as functions of pressure and initial sample temperature are given over the pressure range 1 atm <, p <^ 50,000 psi and -150 j< to _< 150°C.

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