Spray-anti-solvent crystallization method for preparing doped aluminum powder composite microspheres
Nano-aluminum powder is widely used in the field of energetic composite materials as a high-energy additive.However,the preparation of high sphericity aluminum powder doped composite microspheres is faced with a series of challenges.In this paper,a spray-crystallization method for the preparation of composite functional microspheres formed by nano-aluminum powder and organic molecules was explored by using the method of spray and anti-solvent crystallization.Through the self-designed internal mixing three-flow air atomization nozzle,the precursor liquid is atomized into liquid droplets.After receiving in the anti-solvent receiving bath,the solvent and anti-solvent rapidly mutual diffusion and mass transfer process occur.The energetic molecular simulation sucrose octaacetate(SOA)is precipitated in the droplet,the aluminum powder is wrapped in it,and the aluminum powder doped composite microspheres are obtained after washing and drying.In this paper,by adjusting suitable conditions such as atomization,solvent and anti-solvent,additives,etc.,the phenomenon of low sphericity and agglomeration of the composite microspheres after drying was successfully solved.Finally,the doped aluminum powder microsphere composite material with narrow particle size distribution,uniform morphology,good dispersion,sphericity and high compactness was prepared.
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