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Determination of the Thermal Diffusivity of a Zr/PbCrO 4 Pyrotechnical Mixture and of the arrhenius parameters of the ignition reaction in presence of an oxidizing atmosphere
Author(s) -
Marlin F.,
Roux M.,
Brassy C.,
Espagnacq A.
Publication year - 1994
Publication title -
propellants, explosives, pyrotechnics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.56
H-Index - 65
eISSN - 1521-4087
pISSN - 0721-3115
DOI - 10.1002/prep.19940190302
Subject(s) - thermal diffusivity , oxidizing agent , ignition system , arrhenius equation , diffusion , zirconium , materials science , autoignition temperature , analytical chemistry (journal) , inert gas , thermodynamics , oxygen , arrhenius plot , chemistry , activation energy , metallurgy , chromatography , organic chemistry , composite material , physics
An experimental device with main features closely related to those of Cook‐Off type (1) devices has been developed to attain the specific study requirements. The tested product is a pyrotechnical compound containing zirconium and lead chromate in the proportion of 60% Zr and 40% PbCrO 4 . An iterative calculation method has been developed to determine thermal diffusivity without any reaction and to evaluate the Arrhenius kinetic parameters of the product ignition reaction. The Zr/PbCrO 4 compounds appear as cylindrical tablets dia. 14 mm and 11.7 mm high. From room temperature to about 100°C, thermal diffusivity ranges between 3.2 and 3.9. 10 7 m 2 /s. The ignition reaction kinetic parameters in an oxidizing atmosphere are as follows: Ea = 47 kJ/mol and Z = 10 · s −1 . With the results from thermal analysis, we demonstrate that initiation can be attributed to the oxygen contained in air, which diffuses into the product porosities. Lead chromate behaves as an inert substance throughout the ignition phase.