In order to explore the pre-ignition reaction of aluminum/polytetrafluoroethylene(Al/PTFE)material,Al2O3/PTFE com-posites were prepared by ultrasonic mixing method.The crystal structure,microstructure and thermochemical properties were charac-terized and the thermochemical reaction characteristics and influencing factors were analyzed.The results show that Al2O3 can delay the initial temperature of PTFE melting.The smaller the particle size of Al2O3 and PTFE,the easier it is for the Al2O3/PTFE material to re-act and release more heat.Al2O3 with small particle size can delay the initial temperature of AlF3 formation reaction and advance the initial temperature of AlF3 crystal transformation reaction,thus increasing the concentrated heat release of the reaction.The reaction degree of Al2O3(50 nm)and PTFE(1 μm)is the highest.The thermochemical reaction properties of α-Al2O3/PTFE are better than those of γ-Al2O3/PTFE and amorphous Al2O3/PTFE.The thermochemical reaction of Al2O3/PTFE exhibits the typical kinetic charac-teristics.With the increase of the heating rate,the peak temperature of the main heat release peak of the reaction increases.The cal-culated apparent activation energy of Al2O3/PTFE reaction is 45.0kJ/mol.
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