The therma
l stab
ility of 3,6-d
ihydraz
ino-1,2,4,5-tetraz
ine (DHT) and 3,6-b
is(1H-1,2,3,4-tetrazo
l-5-y
lim
ino)-1,2,4,5-tetraz
ine (BTATz) have been exam
ined by
isotherma
l and non
isotherma
l methods. The research conducted a
llow cons
ider
ing that the f
irst stage of DHT decompos
it
ion
is an un
ique, from v
iewpo
int of therma
l decompos
it
ion, redox process,
in wh
ich tetraz
ine r
ing
is reduced by hydraz
ine group form
ing d
iam
inod
ihydrotetraz
ine and mo
lecu
lar n
itrogen. In the case of BTATz, the decompos
it
ion beg
ins w
ith
less thermostab
le tetrazo
le fragments, wh
ich captures the tetraz
ine r
ing a
lso. The presence of pre
lim
inary react
ions of
isomer
izat
ion dur
ing tetrazo
le r
ing decompos
it
ion
is the reason for the
large observab
le act
ivat
ion energy of decompos
it
ion (240.6 kJ/mo
l or 57.5 kca
l/mo
l)
in the temperature
interva
l 250-334 ¡ãC. In the combust
ion wave at h
igher temperatures, the act
ivat
ion energy of BTATz decompos
it
ion has cons
iderab
ly
lower va
lue (128.4 kJ/mo
l or 30.7 kca
l/mo
l), wh
ich
is c
lose to theoret
ica
lly ca
lcu
lated one.
Burning characteristics of DHT and BTATz have been investigated. The temperature distribution in the combustion waves of DHT and BTATz have been measured at low pressures, which allows obtaining the surface temperature dependence vs. pressure. The research conducted allow considering that the burning of investigated compounds controls by a combustion model with leading reaction in the condensed phase.