Abstract:To study the mechanical properties and reaction characteristics of aluminum/titanium hydride/polytetrafluoroethylene (Al/TiH2/PTFE) reaction materials, four kinds of specimens with different content of TiH2(0%, 5%, 10%, 20%) were prepared by cold isostatic pressing and vacuum sintering process.At the same time, TiH2/PTFE specimens without active Al particles were also prepared as the control group, then all the specimens were subjected to quasi-static compression experiments. The stress-strain curves and the reaction rate data of the specimens with different TiH2 content were obtained, and the reaction phenomena of the specimens were recorded.Moreover, the phase analyses of reaction residues were performed by XRD and the reaction mechanism of the materials was discussed.Results show that the content of TiH2 has a significant effect on the material properties and the reaction rate.When the content of TiH2 is 5%, the reaction rate is 90% and the material strength reaches the maximum value of 108 MPa, which is 15.1% higher than that of Al/PTFE type material.When the content of TiH2 and Al is the same, the reinforcing effect of TiH2 particles on PTFE matrix is greater than that of Al particles.Compared with Al/PTFE material, a special combustion flaming phenomenon appears in the reaction of TiH2-containing samples, and the phenomenon gradually is obvious with the increasing of TiH2 content.The high temperature of the crack tip of materials causes the reaction between Al and PTFE, which makes TiH2 activate, hydrogen release and TiC generate, the energy of TiH2 fully release and the purpose of using as a high-energy additive reach.
