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Combustion Aspects of Sodium Azide and its mixtures with potassium perchlorate and burning catalysts
Author(s) -
Hasue Kazuo,
Iwama Akira,
Kazumi Takashi
Publication year - 1991
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.19910160509
Subject(s) - ammonium perchlorate , chemistry , thermal decomposition , potassium perchlorate , combustion , catalysis , analytical chemistry (journal) , potassium , decomposition , sodium , sodium azide , particle size , particle (ecology) , adiabatic flame temperature , inorganic chemistry , organic chemistry , combustor , oceanography , geology
Linear burning rate, thermal aualysis, temperature profile, flame structure and cryogenic burnability for the mixtures of sodium azide (SA) of different particle sizes (3.5 μm, 22 μm, and 67 μm), potassium perchlorate (KP) and with or without three kinds of burning catalysts (GeO 2 , Er 2 O 3 , and Y 2 O 3 ) have been investigated. The linear burning rates increase with the KP content up to 33Wt% for similar SA particle size. The temperature‐time histories in the vicinity of burning surface were obtained with 20 μm Type K thermocouple embedded in a Strand. The burning surface temperaturres of neat SA and of the SA/KP mixtures are nearly 350°C and 350°C ∼ 550°C, respectively, while the existence of the decomposition surface at 250 °C and condensed layer was suggested with SA/KP mixtures. In visual observation for the flame structure, the front of luminous flame zone appers to be in contact with the condensed phase surface. For example, however, the temperature profile suggests that there exists finitc distance from decomposition surface to flame front in the order of 0.05 mm ∼ 0.1 mm at 1 MPa for SA/KP = 80/20. The differential thermal analysis indicates that the tested catalysts have retarding effect on SA combustion, but a positive effect on neat KP decomposition in spite of being impotent for the burning rate increase of the SA/KP mixture. It was also found that SA strands containing appropatiae fractions of KP can hurn even in liquid nitrogen.