Abstract
Metal/fluoropolymer composites are a category of energetic structural materials that release energy through exothermic chemical reactions initiated under highly dynamic loadings. In this paper, the chemical reaction mechanism of PTFE (polytetrafluoroethylene)/Ti/W composites is investigated through thermal analysis and composition analysis. These composites undergo exothermic reactions at 510 °C to 600 °C, mainly producing TiFx. The tungsten significantly reduces the reaction heat due to its inertness. In addition, the dynamic compression properties and impact-induced reaction behaviors of PTFE/Ti/W composites with different W content prepared by pressing and sintering are studied using Split Hopkinson Pressure Bar and high speed photography. The results show that both the mechanical strength and the reaction degree are significantly improved with the increasing strain rate. Moreover, as W content increases, the mechanical strength is enhanced, but the elasticity/plasticity is decreased. The PTFE/Ti/W composites tend to become more inert with the increasing W content, which is reflected by the reduced reaction degree and the increased reaction threshold for the impact ignition.
Highlights
Metal/fluoropolymer composites have high energy density and rapidly release energy upon impact, which has allured researchers into intensely studying them in recent years [1,2]
This paper presents research on the impact-induced reaction characteristics of PTFE/Ti composites enhanced by W particles
The reactions between Ti and C2F4 release a large amount of energy, so they are considered the present in the composites, resulting in decreased reaction heat per unit of mass, which can be visualized main chemical reactions
Summary
Metal/fluoropolymer composites have high energy density and rapidly release energy upon impact, which has allured researchers into intensely studying them in recent years [1,2]. Metal/fluoropolymer composites are formed when active metal powders are uniformly mixed into a fluoropolymer matrix, cold pressed, and undergo a sintering hardening process to enhance their mechanical strength These composites are sufficiently inert and insensitive to friction, flame, and detonation under normal conditions, which is markedly different from traditional energetic materials, such as explosives and propellants. Shock energy drives the active metal and the fluoropolymer to react violently, causing a detonation-like phenomenon to occur that releases a large amount of thermal energy and gaseous products Due to their mechanical and energetic properties, metal/fluoropolymer composites are widely used in both military and civilian applications as replacements for components traditionally made of inert materials, such as fragmentation warheads, shaped-charge warheads, penetrating warheads, and oil-well perforations [3]. The chemical reaction mechanism and dynamic compression properties of PTFE/Ti/W composites were established
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