Mn+Sb2O3 thermite/intermetallic delay compositions

Show simple item record Montgomery, Yolandi C. Focke, Walter Wilhelm Atanasova, Maria T. Del Fabbro, Olinto Kelly, Cheryl 2016-11-09T09:47:21Z 2016-10
dc.description.abstract The binary Mn + Sb2O3 pyrotechnic composition was investigated for mining detonator time delay applications. EKVI thermodynamic modelling predicted two maxima in the adiabatic reaction temperature. The local maximum, at a manganese fuel content of ca. 36 wt-%, corresponds to a pure thermite-type redox reaction: 3Mn + Sb2O3  3MnO + 2Sb. The overall maximum in the adiabatic reaction temperature (ca. 1640 K), at the fuel-rich composition of 49 wt-% Mn, is consistent with the reaction 5Mn + Sb2O3  3MnO + 2MnSb, i.e. a combination of the standard thermite with an additional exothermic intermetallic reaction. XRD analysis of combustion residues confirmed the formation of MnSb and Mn2Sb for fuel-rich compositions. Burn rates were measured using delay elements assembled into commercial detonators. The d50 particle sizes were 23.4 and 0.92 m for the Mn fuel and Sb2O3 oxidant powders respectively. The delay elements comprised rolled lead tubes with a length of 44 mm and an outer diameter of 6.4 mm. The rolling action compacted the pyrotechnic compositions to 74  2 % theoretical maximum density. The burning rate increased linearly from 4.2 to 9.4 mm s1 over the composition range 25 - 50 wt-% Mn. en_ZA
dc.description.department Chemical Engineering en_ZA
dc.description.embargo 2017-10-31
dc.description.librarian hb2016 en_ZA
dc.description.sponsorship Financial support from AEL Mining Services and the THRIP programme of the Department of Trade and Industry and the National Research Foundation. en_ZA
dc.description.uri en_ZA
dc.identifier.citation Montgomery, YC, Focke, WW, Atanasova, M, Del Fabbro, O & Kelly, C 2016, 'Mn+Sb2O3 thermite/intermetallic delay compositions', Propellants, Explosives, Pyrotechnics, vol. 41, no. 5, pp. 919-925. en_ZA
dc.identifier.issn 0721-3115 (print)
dc.identifier.issn 1521-4087 (online)
dc.identifier.other 10.1002/prep.201600007
dc.language.iso en en_ZA
dc.publisher Wiley en_ZA
dc.rights © 2016 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim. This is the pre-peer reviewed version of the following article : Mn+Sb2O3 thermite/intermetallic delay compositions, Propellants, Explosives, Pyrotechnics, vol. 41, no. 5, pp. 919-925, 2016. doi : 10.1002/prep.201600007. The definite version is available at : en_ZA
dc.subject Delay composition en_ZA
dc.subject Thermite en_ZA
dc.subject Intermetallic en_ZA
dc.subject Particle size en_ZA
dc.subject Burn rate en_ZA
dc.title Mn+Sb2O3 thermite/intermetallic delay compositions en_ZA
dc.type Postprint Article en_ZA

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