高燃烧热 Ti/B/PTFE 活性材料动态力学性能及释能特性

Based on the high calorific value of the Ti/B binary system，this study designed and fabricated the Ti/B/PTFE reactive materials with high energy release efficiency. The materials exhibited practical application prospects in the industrial field. To investigate the energy release characteristics of the Ti/B/PTFE reactive materials，the study conducted combustion tests，dynamic mechanical property experiments and ballistic gun experiments. By employing the oxygen bomb calorimeter and the Split Hopkinson Pressure Bar（SHPB）apparatus，the combustion and dynamic mechanical properties of the Ti/B/PTFE reactive materials were obtained. The influences of PTFE content and ambient atmosphere on the energy release characteristics of Ti/B/PTFE reactive materials were analyzed through the confined vessel impact energy release experiments. The study further calculated the energy release efficiency of the Ti/B/PTFE reactive materials under different operating conditions based on the closed tank pressure curves. Results indicate the energy density of Ti/B/10%PTFE reactive materials（26.15 kJ·g^-1）and Ti/B/15%PTFE reactive materials （26.47 kJ·g^-1）is high than traditional reactive material Al/PTFE（13.89 kJ·g^-1）. Ti/B/PTFE reactive materials exhibit strain rate effect. With the increase of strain rate，the yield strength of the 10% PTFE specimen increases from 28.3 MPa to 34.2 MPa and that of the 15% PTFE specimen increases from 47.1 MPa to 51.1 MPa. The impact energy release process of Ti/B/PTFE reactive materials in confined vessel can be divided into four stages：material destruction，hot spot formation，combustion energy release and pressure relief. The reaction efficiency of Ti/B/PTFE reactive materials depends on the impact velocity. As the impact velocity increases，the reaction efficiency improves significantly. Compared with the inert atmosphere，the energy release of Ti/B/PTFE reactive materials is more intense in air. This is attributed to the oxidation reaction between reactive elements and oxygen in the air.