The effects of TiH₂ on the thermal decomposition performances of ammonium perchlorate-based molecular perovskite (DAP-4)

ABSTRACT

In order to promote the development of molecular perovskite energetic materials, studying thermal decomposition performances of AP-based molecular perovskite energetic materials ((H₂dabco)[NH₄(ClO₄)₃], DAP-4) catalyzed by metal hydrogen storage fuel is significant. In this study, the morphology, structure and thermal decomposition characteristics of TiH₂, DAP-4 and DAP-4/TiH₂ composite materials were characterized and investigated. The experimental results showed that the DAP-4 peak exothermic temperature at different heating rates both showed a decreasing trend with TiH₂ content increased. With 20 wt% TiH₂ added, the DAP-4 peak exothermic temperature decreased from 394.3 ℃ to 352.8 ℃ (10 ℃/min heating rate), and the apparent activation energy (E_a) also decreased from 201.5 KJ/mol to 182.3 KJ/mol. A possible catalytic thermal decomposition mechanism of perovskite catalyzed by TiH₂ was proposed. This work is helpful to further understand the thermal decomposition characteristics of molecular perovskite energetic materials in the presence of metal hydrides.

KEYWORDS:

• Molecular perovskite
• metal hydride TiH₂
• (H₂dabco)[NH₄(ClO₄)₃]
• decomposition characteristics

Supplementary material

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Additional information

Funding

This work was supported by the National Natural Science Foundation of China (NSFC) [U1730108].