Influence of composition and microstructure on the properties of PTFE/Mg reactive materials

To investigate the effect of composition and microstructure on the properties of PTFE/Mg reactive materials, four composition ratios were designed and eight kinds of PTFE/Mg reactive powders were prepared by ball-milling mixing and ultrasonic mixing. Subsequently, the bulk PTFE/Mg materials were obtained via cold isostatic pressing of the PTFE/Mg powders followed by vacuum sintering. The morphologies, heat of reaction and burning rates of the PTFE/Mg powders, as well as the microstructure and impact-initiated reaction characteristics of the bulk PTFE/Mg materials were comprehensively characterized. The results show that with the increase of Mg content, the properties of the materials prepared by the two mixing processes show different trends. In addition, compared to the PTFE/Mg materials prepared by ball-milling mixing, the PTFE/Mg materials prepared by ultrasonic mixing show higher heat of reaction and burning rate, and the corresponding bulk PTFE/Mg materials have more uniform microstructures and demonstrate enhanced impact-initiated reaction characteristics.