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Energy Performance and Aging of RDX‐based TiH 2 , MgH 2 Explosive Composites
Author(s) -
Xue Bing,
Lin Moujin,
Ma Honghao,
Wang Yixin,
Shen Zhaowu
Publication year - 2018
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.201700269
Subject(s) - explosive material , materials science , hydrogen storage , magnesium hydride , hydride , composite number , composite material , thermogravimetry , thermal stability , mass fraction , metal , overpressure , metallurgy , chemical engineering , alloy , inorganic chemistry , chemistry , thermodynamics , organic chemistry , engineering , physics
Two typical binary metal hydrides, TiH 2 and MgH 2 were introduced into the RDX based explosive composites. Charges with different contents of metal hydride were evaluated through underwater explosion. Composite with 10 % MgH 2 exhibited the best shockwave parameters, peak overpressure, specific impulse and specific shock energy of which promoted by 5.7 %, 7.0 % and 8.4 % respectively. Whereas, the specific bubble energy of composite with 10 % TiH 2 showed the maximum enhancement of 5.5 %, and density specific energy of which increased significantly attributed to the large density of TiH 2 . Meanwhile, a 2‐year ambient storage test of metal hydride reactants and RDX‐metal hydride explosive composites was conducted to evaluate the safety and stability. X‐ray diffraction (XRD), thermogravimetry (TG) and differential thermal analysis (DTA) were then conducted to analyze the aged samples. Results revealed that TiH 2 and its explosive composites showed an excellent storage stability due to the formation of thin TiO 2 film. Whereas, mass fraction of Mg(OH) 2 was found increasing with time in both MgH 2 and its explosive composite, of which hydrolysis of MgH 2 was the main mechanism. Moreover, Mg was found in aged MgH 2 powder as a result of decomposition. The mechanical strength of aged charges of RDX based MgH 2 explosive composite also degraded significantly ascribed to the released hydrogen.