The effect of perchlorate on the thermal reaction behavior of Al/PTFE active materials
In order to study the effect of perchlorate on the thermal reaction behavior of Al/PTFE binary active materials,potassium perchlorate(KClO4)and sodium perchlorate(NaClO4)were selected as filling materials,and KClO4/Al/PTFE and NaClO4/Al/PTFE ternary active materials samples were prepared by wet mixing method.The microstructure of the samples was observed by scanning electron microscopy(SEM).The thermal and combustion properties of the perchlorate/Al/PTFE ternary active material system were studied by synchronous thermal analysis(TGA-DSC),X-ray diffraction(XRD),and a self-built combustion testing device.The results showed that the perchlorate powder and Al powder were uniformly distributed on the PTFE substrate.The decomposition reaction temperature of the perchlorate/Al/PTFE active materials system were lower than that of the Al/PTFE active materials system found by the TG-DSC synchronous thermal analysis experiment.Among them,the decomposition heat release of KClO4/Al/PTFE ternary active materials is slightly lower than NaClO4/Al/PTFE ternary active materials;The decomposition temperature of KClO4 were decreased for the catalytic action of PTFE,and the peak temperature of KClO4/Al/PTFE ternary active materials also decreased by 29.1℃;The peak temperature of sodium NaClO4/Al/PTFE ternary active materials was increased by 7.5℃.Compared with NaClO4,the addition of KClO4 was beneficial for the utilization of C.In the ignition experiment,the addition of perchlorate can effectively increase the combustion duration,detonation duration,and maximum pressure of the Al/PTFE active materials system,but it also reduces the pressure increase rate of the system and increases the time to reach the maximum pressure.
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