Abstract
Al-PTFE (aluminum-polytetrafluoroethene) is regarded as one of the most promising reactive materials (RMs). In this work, Ni (Nickel) was added to Al-PTFE composites for the purpose of improving the energy density and damage effect. To investigate the thermal behavior, mechanical properties and reaction characteristics of the Al-Ni-PTFE composites, an Al-PTFE mixture and an Al-Ni mixture were prepared by ultrasonic mixing. Six types of Al-Ni-PTFE specimens with different component mass ratios were prepared by molding sintering. Simultaneous thermal analysis experiments were carried out to characterize the thermal behavior of the Al-PTFE mixture and the Al-Ni mixture. Quasi-static compression tests were performed to analyze the mechanical properties and reaction characteristics of the Al-Ni-PTFE specimens. The results indicate that the reaction onset temperature of Al-Ni (582.7 °C) was similar to that of Al-PTFE (587.6 °C) and that the reaction heat of Al-Ni (991.9 J/g) was 12.5 times higher than that of Al-PTFE (79.6 J/g). With the increase of Ni content, the material changed from ductile to brittle and the strain hardening modulus and compressive strength rose first and then subsequently decreased, reaching a maximum of 51.35 MPa and 111.41 MPa respectively when the volume fraction of Ni was 10%. An exothermic reaction occurred for the specimens with a Ni volume fraction no more than 10% under quasi-static compression, accompanied by the formation of Ni-Al intermetallic compounds. In the Al-Ni-PTFE system, the reaction between Al and PTFE preceded the reaction between Al and Ni and the feasibility of increasing the energy density and damage effect of the Al-Ni-PTFE reactive material by means of Ni-Al reaction was proved.
Highlights
Reactive materials, which are generally composed of two or more non-explosive solid materials, are a new type of energetic material induced by an impact
Al-PTFE mixture and an Al-Ni mixture were characterized by thermogravimetric-differential scanning calorimetry (TG-DSC) and six types of Al-Ni-PTFE specimens with different equivalence ratios were prepared
The failure strain of the material decreased monotonously with the increase in Ni content, reaching a maximum value of 2.04 when the material was not added to Ni and a minimum value of 0.35 when the Ni volume fraction was 40%, indicating that the material changed from ductile to brittle with an increasing
Summary
Reactive materials, which are generally composed of two or more non-explosive solid materials, are a new type of energetic material induced by an impact. As a typical reaction material, Al-PTFE (aluminum-polytetrafluoroethene) has the characteristics of a higher energy density, better mechanical properties, stronger stability, and easier preparation compared with traditional energetic materials such as explosives and propellants [4,5]. Ni has a higher density (8.9 g/cm3 ) and Eakins found that Ni and Al can undergo chemical reactions under impact loading to form Ni-Al intermetallic compounds [17,18,19] In this regard, the addition of Ni particles to Al-PTFE can increase the strength and density of the material but can increase the energy density of the material and enhance the damaging effect on target. Al-PTFE mixture and an Al-Ni mixture were characterized by thermogravimetric-differential scanning calorimetry (TG-DSC) and six types of Al-Ni-PTFE specimens with different equivalence ratios were prepared Their mechanical properties and reaction characteristics under quasi-static compression were investigated
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