A variety of Al/TFGE binary compounds with coated spherical micron aluminum(Al)powders of different particle sizes(1,5,12,29 µm)were prepared by introducing a new type of terminal hydroxyl fluoropolymer TFGE.The microscopic morphology of micron Al powders with different particle sizes and Al/TFGE binary compounds were characterized by using SEM.The thermal decomposition behaviors of micron Al powder and Al/TFGE binary compounds were analyzed by using TG and DSC.The ignition and combustion process were investigated by laser ignition technique to obtain the influence of the parti-cle size of Al powder on the ignition delay time,and the combustion residue was analyzed by SEM and XRD.The results show that the ignition delay time of the micron Al powder after coating TFGE increases,and the ignition delay time of 1 µmi Al in-creases from 103.5ms to 130.5ms.However,the coating of TFGE can obviously enhance the reactivity and the combustion efficiency of micron Al powder,and promote the combustion performance of micron Al powders.Through the analysis of the combustion residue,it is found that the combustion of Al/TFGE binary compounds generates Al4C3 and AlF3 solid-phase prod-ucts,which are mainly generated by the chemical reactions of CHx and CF3 with Al powder.At the same time,with the in-crease of the particle size of Al powder and the increase of the coating thickness,the proportion of Al4C3 and AlF3 products decreases,the proportion of unreacted aluminum powder increases,and the combustion reaction activity is inhibited.
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维普
