Abstract
To analyze the mechanical properties and reaction characteristics of Al-ZrH2-PTFE (aluminum-zirconium hydride-polytetrafluoroethylene) composites under quasi-static compression, five types of specimens with different ZrH2 contents (0%, 5%, 10%, 20% and 30%) were prepared by molding-vacuum sintering. The true stress-strain curves and reaction rates of the different specimens were measured using quasi-static compression. The specific reaction processes were recorded by a high-speed camera. The corresponding reaction products were characterized by the XRD phase analysis, the calorific value was tested by a Calorimeter, and the reaction mechanism was analyzed. According to the results, the strength of the composites increased first and then decreased with the increase in the content of ZrH2. It reached a maximum of 101.01 MPa at 5%. Violent reaction occurred, and special flames were observed during the reaction of the specimens with 5% ZrH2. With the increase in the content of ZrH2, the chemical reaction was hard to induce due to the reduction in strength and toughness of composites. The reaction mechanism of Al/ZrH2/PTFE reveals that high temperatures at crack tip induced the reaction of Al and PTFE. Subsequently, ZrH2 decomposed to release hydrogen and generate ZrC. Calorimetric experiment shows that the calorific value of Al/ZrH2/PTFE with 20% ZrH2 is higher than that of Al/PTFE. The findings verify the potential of ZrH2 as an energetic additive for the enhancement of strength and release of the energy of the composites.
Highlights
Reactive materials generally refer to the metastable energetic composites composed of two or more non-explosive solid materials, e.g., polymers-metals and metals-metals, which can have a violent reaction under impact loading
Compared with the conventional insensitive explosives, Al-PTFE exhibits a higher level of energy release and better mechanical properties [5,6,7]
It has high application implication in the field of military damage, e.g., the unit functionalized to cause secondary damage, and large application potential in other fields of air defense, anti-missile, barrier breaking, rocket propulsion system, petroleum exploitation, etc. [8,9] For instance, the advantage of reactive materials applied in warheads is that when high-speed
Summary
Reactive materials generally refer to the metastable energetic composites composed of two or more non-explosive solid materials, e.g., polymers-metals and metals-metals, which can have a violent reaction under impact loading. Compared with the conventional insensitive explosives, Al-PTFE exhibits a higher level of energy release and better mechanical properties [5,6,7]. It has high application implication in the field of military damage, e.g., the unit functionalized to cause secondary damage, and large application potential in other fields of air defense, anti-missile, barrier breaking, rocket propulsion system, petroleum exploitation, etc. A new type of energetic materials, have aroused huge attention from scholars in recent years. They have been extensively used in both the military and civil fields for their high hydrogen storage density, high chemical energy and excellent activity [16]. The mechanical properties and reaction characteristics were explored by the quasi-static compression experiments and under the scanning electron microscope (SEM), adiabatic bomb calorimeter and X-ray diffraction (XRD), and the reaction mechanism of the material was analyzed
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