The application discloses an aluminum-based
powder fuel with a
grain boundary oxygen vacancy channel and a preparation method and application thereof, and particularly relates to the technical field of
metal fuel and aluminum-based
alloy powder fuel. The method comprises the following steps: heating and melting pure aluminum to form an aluminum melt; then adding an Al-RE intermediate
alloy into the aluminum melt, and adjusting the total content of
rare earth elements RE in the melt to be 0.1-7 wt%; finally, performing controlled supersonic atomization rapid solidification on the uniformly mixed melt to obtain an aluminum-based
alloy powder. After the powder burns, a
rare earth oxide channel rich in
oxygen vacancy defects is constructed at the
grain boundary, and the oxidation
combustion is further promoted. The lattice
distortion caused by the difference in atomic radii of double
rare earth (Ce / La) and the in-situ
solid solution of
boron atoms greatly reduce the formation energy of
oxygen vacancies. In the
combustion process, high-concentration oxygen vacancies form a "high-speed oxygen
transmission channel", break the barrier of the dense
oxide film, and enable oxygen to quickly penetrate into the particle core, thereby significantly improving the
burnout rate and energy release efficiency of the aluminum powder.