Accession Number : ADA311583

Title :   The Effects of Ferrocenic and Carborane Derivative Burn Rate Catalysts in AP Composite Propellant Combustion: Mechanism of Ferrocene-Catalysed Combustion.

Descriptive Note : Technical rept.,

Corporate Author : DEFENCE SCIENCE AND TECHNOLOGY ORGANIZATION CANBERRA (AUSTRALIA)

Personal Author(s) : Nguyen, T. T.

PDF Url : ADA311583

Report Date : AUG 1995

Pagination or Media Count : 50

Abstract : The combustion of HTPB/AP propellants containing ferrocene-type and carborane-type burn rate catalysts was examined. The ferrocenic catalysts are good burn rate enhancers, but the carborane-type compounds showed little improvement, even at 3% catalyst concentration. An order of relative catalyst effectiveness was established for 1% catalyst concentration at 20 deg C. Examination reveals the enhancing effect of 1% Catocene is approximately equivalent to 0.5% Butacene. Characteristic surface features observed for the carborane- catalysed propellants contrast to those for the ferrocene-catalysed propellants. For ferrocene-catalysed combustion, the experimental evidence is in favour of a mechanism whereby the ferrocenic catalyst acts in the binder to catalyse the heterogeneous reactions between the binder and the AP at the binder/oxidiser interface. The evidence includes the following: (1) Enhanced burn rates of the Butacene propellant over the Catocene propellant, both propellants containing the same amount of iron in the ferrocenic catalysts; (2) Fe particles dispersed in the binder of the quenched propellant surface; (3) undercuttings along the boundaries of surface AP particles; and (4) the convex, protruding (sometimes apparently intact) AP particle surface. There was no evidence of the catalyst promoting surface AP decomposition reactions. p50

Descriptors :   *COMBUSTION, *CATALYSTS, *BURNING RATE, *AMMONIUM PERCHLORATE, *CARBORANES, *FERROCENES, *COMPOSITE PROPELLANTS, SCANNING ELECTRON MICROSCOPES, AUGMENTATION, EXPLOSIVES, QUENCHING, IRON, SURFACES, PROPELLANTS, BOUNDARIES, PARTICLES, X RAY PHOTOELECTRON SPECTROSCOPY, ALUMINUM, HETEROGENEITY, BINDERS, AUSTRALIA, DECOMPOSITION, PYROLYSIS, SOLID ROCKET PROPELLANTS, PROPELLANT BURN OUT, HYDROXY TERMINATED POLYBUTADIENE.

Subject Categories : Combustion and Ignition
      Inorganic Chemistry
      Organic Chemistry
      Solid Rocket Propellants

Distribution Statement : APPROVED FOR PUBLIC RELEASE