Effect of CF on mechanical properties and ignition characteristics of Al/PTFE reactive materials under quasi-static compressive

Abstract

The chopped carbon fiber (CF) was introduced into Al (aluminum) /PTFE (polytetrafluoroethylene) reactive materials, and Al/CF/PTFE reactive materials with different mass fractions of CF were prepared. In order to study the effect of CF on the mechanical properties and ignition characteristics of Al/PTFE reactive materials, quasi-static compression tests were carried out on different types of specimens. The fracture characteristics of the specimens were observed by SEM, and the ignition mechanism was analyzed by crack-induced hot spots. The results show that yield strength and elastic modulus increase while compressive strength and yield strain decrease with increasing CF mass fraction. The decrease in interfacial adhesion between CF and PTFE matrix, uneven load transfer of CF during compression and stress concentration lead to the decrease of mechanical properties of the material. The decrease of compressive strength of Al/CF/PTFE material and the failure of crack tip without ductile brittle transition are the main factors for the non ignition reaction in quasi-static compression. CF did not improve the quasi-static pressure properties of Al/PTFE, but decreased the quasi-static pressure sensitivity.