Study On Reaction Heat Measuring And Energy Release Characteristics Of PTFE/Al Reactive Material

Aiming at solving the existing problems in measuring reaction heat and assessing impact energy release for PTFE/Al reactive material,this paper desighed a system based on laser initiation technology for measuring reaction heat of materials,and a system measuring overpressure in a sealed container and impact force out of the container simultaneously for evaluating energy release of materials.The two systems were used to research reaction heat measuring and impact energy release of PTFE/Al reactive material,and the main results were as follows:The calibration and testing results showed that the laser-initiation system had good consistency and veracity,and can be used to measure reaction heat of reactive materials.For PTFE/Al reactive material,the optimum experimental condition was that laser power of laser(P1)=18W and laser initiation time(t)=10s.The experimental results indicated that the data measured by the laser-initiation system had good consistency and could reflect the reaction heat of PTFE/Al reactive material objectively.For PTFE/Al reactive material with non-stoichiometry ratio whose products are relatively complicate and reaction heat cannot be calculated,the designed system could measure its reaction reaction objectively.In addition,the system could measure combustion heat of PTFE/Al and reaction reaction of Fe2O3/Al material.In order to meet the needs of evaluating characteristics of energy output for small dose PTFE/Al reactive material,a system measuring overpressure in a sealed container and impact force out of the container simultaneously for assessing energy release of materials was build.The results of measured overpressure-time and force-time curves showed that the energy release rate of PTFE/Al material was higher while the impact velocity increased.The released energy is about 72% of reaction heat,or 43% of combustion heat under impact velocity of 910m?s-1.