active aluminium flake powder
preparation and activity of flake aluminium powder
in order to obtain flake aluminium powder with high activity , a vertical ball Miller was employee to mill spherical aluminium powder with particular size at 14um , and ethylene acetate was used as solvent .morphology and particle size of aluminium powder before and after milling was analyst useing laser size analyzer and scanning electro microscopy (SEM ), cystal structure of aluminium powder before and afraid milling was aslo characterized by X-ray powder diffraction (XRD).
it is found that 1um flake aluminium powder could be prepared through milling for 2h , and ITIL has same crystal form as aluminium powder before milling , further more , the mass fraction of active aluminium before and after milling was determined by oxidation -reduction titration reaction , which is 90.4%and 98.42% , respectively , the thermal reaction characteristics of aluminium powder before and mill were investigated by TG-DSC method , the weight of aluminium powder after milling increase by 84.8% between 480degree to 980degree , indicating that oxidation reactivity of aluminium is greatly by ball milling , therefore , the superfine and laminarization of aluminium powder can enhance the energy of propellant and explosive .
