Effects of oxidizer structure on thermal and combustion behavior of Fe2O3/Zr thermite

Materials Research Express - Tập 8 Số 10 - Trang 105014 - 2021
Chunhong Li1,2, Xiaoli Kang1
1Civil-Military Integration Key Laboratory for Advanced Energetic Materials and Devices, Xihua University, Chengdu 610039, People's Republic of China
2School of Materials Science and Engineering, Xihua University, Chengdu, 610039, People's Republic of China

Tóm tắt

Abstract Performance of MOF-derived micrometer porous Fe2O3 as the oxidizer in Zr-fuelled thermite is compared with commercial nano-sized Fe2O3 by characterizing thermal and combustion behavior of Fe2O3/Zr mixture via differential scanning calorimetry, optical emission measurement as well as composition and morphology analysis on condensed combustion products. Results show that thermal behaviors of Fe2O3/Zr with a slow heating rate have little difference regardless of the kind of Fe2O3. However, MOF-derived micrometer porous Fe2O3 show an obvious superiority in enhancing combustion of Fe2O3/Zr heated by a high rate. Combustion reactions of Fe2O3/Zr under high heating rates are probably rate-controlled by condensed reaction. The better performance of MOF-derived Fe2O3 is attributed to its larger contact area with Zr particle in that micrometer porous Fe2O3 particles are easily broken into primitive nano-sized particles, which effectively avoid the agglomeration of oxidizer. The MOF-derived Fe2O3 particles obtained at calcination temperature of 550 °C enable the best combustion performance of Fe2O3/Zr thermite. This should be because the crystallinity and porous structure of 550 °C-Fe2O3 are more favorable for the mass transfer process during high-rate combustion.

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Materials Research Express

Tập 8 Số 10

105014

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