A study of impact energy release mechanism and reactive characteristic of Ni-Al-W reactive material fragments

Abstract

To study the impact reaction characteristics and energy release mechanism of Ni-Al-W reactive material fragments. As the research object, the fragments had been added to W with different mass fraction and particle size. Ballistic rifle test method had been adopted. Quasi-static overpressure which had been produced from the reaction under certain impact conditions had been measured. The residual particles had been collected so that the microstructure and the reaction products after impact-response was contrastive analyzed, with scanning electron microscope (SEM) and X-ray diffraction (XRD) composition analysis. The characteristics of quasi-static overpressure and the mechanism of energy release had been analyzed. The results showed that When the impact velocity was 1000±50m/s, several Ni-Al-W metallic reactive fragments with different W content could initiate the chemical reactions, release energy and form quasi-static overpressure. By adding a small amount of W to the component, it is beneficial to improve the energy release level of the impact reaction, initiated by the Ni-Al-W reactive fragments impacting the targets. When the mass fraction of W component was 10%, the quasi-static overpressure was maximized. The mechanism of energy release reaction for metallic reactive fragments was mainly the intermetallic reaction of Ni and Al and the oxidation reaction of Ni metal with air, producing NiAl and NiO at the impact velocity of 1000±50m/s. The particles formed after the fragments impacting the chopping block was smaller, the part of the reacted reactive fragments was more and the degree of the reaction was higher and more intense.