Open AccessEffects of oxidizer structure on thermal and combustion behavior of Fe2O3/Zr thermite
Author(s) -
Chunhong Li,
Xiaoli Kang
Publication year - 2021
Publication title -
materials research express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.383
H-Index - 35
ISSN - 2053-1591
DOI - 10.1088/2053-1591/ac3040
Subject(s) - thermite , combustion , materials science , thermal , metallurgy , nuclear engineering , thermodynamics , chemistry , engineering , aluminium , physics
Performance of MOF-derived micrometer porous Fe 2 O 3 as the oxidizer in Zr-fuelled thermite is compared with commercial nano-sized Fe 2 O 3 by characterizing thermal and combustion behavior of Fe 2 O 3 /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 Fe 2 O 3 /Zr with a slow heating rate have little difference regardless of the kind of Fe 2 O 3 . However, MOF-derived micrometer porous Fe 2 O 3 show an obvious superiority in enhancing combustion of Fe 2 O 3 /Zr heated by a high rate. Combustion reactions of Fe 2 O 3 /Zr under high heating rates are probably rate-controlled by condensed reaction. The better performance of MOF-derived Fe 2 O 3 is attributed to its larger contact area with Zr particle in that micrometer porous Fe 2 O 3 particles are easily broken into primitive nano-sized particles, which effectively avoid the agglomeration of oxidizer. The MOF-derived Fe 2 O 3 particles obtained at calcination temperature of 550 °C enable the best combustion performance of Fe 2 O 3 /Zr thermite. This should be because the crystallinity and porous structure of 550 °C-Fe 2 O 3 are more favorable for the mass transfer process during high-rate combustion.