EFFECT OF MECHANICAL ACTIVATION ON REACTIVITY OF TUNGSTEN – POLYTETRAFLUOROETHYLENE SYSTEM WITH ADDITIVES OF SHS MIXTURES (NI+AL, TI+2B)
HSJSAS
DOI:
https://doi.org/10.25712/ASTU.2072-8921.2026.02.025Keywords:
W PTFE, nano-tungsten, reactive materials, mechanical activation, combustion, ignitionAbstract
The Effect of Mechanical Activation on the Properties of Tungsten-Polytetrafluoroethylene (W+PTFE) Based Reactive Materials with SHS Additives. The influence of mechanical activation (MA) in a ball mill on the properties of reactive materials based on the tungsten-polytetrafluoroethylene (W+PTFE) system with additions of SHS mixtures - nickel and aluminum (Ni+Al) and titanium with boron (Ti+2B) - was investigated. Compositions based on both micron-sized (µW) and nano-sized (nW) tungsten powders were synthesized and characterized. It was shown that mechanical activation leads to a significant increase in the reactivity of all studied compositions. The ignition temperature of the activated compositions decreases by 250-500 °C, while the ignition rate increases by orders of magnitude, reaching values of 1300-2200 °C/s. It was established that MA reduces the induction time before the onset of the self-sustaining reaction, leading to a decrease in the initial ignition temperature of the sample by 280 °C. X-ray phase analysis methods revealed that mechanical activation significantly affects the phase composition of the combustion products. In the compositions 76µW+19PTFE+5(Ni+Al) and 76nW+19PTFE+5(Ni+Al), two double carbides (Ni2W4C, Ni10W3C3) are formed, with their mass fraction being comparable to the fraction of tungsten carbides (W2C, WC). In the composition 76nW+19PTFE+5(Ti+2B), the formation of cubic WC instead of the hexagonal phase was recorded. The studied compositions demonstrate high synthesis completeness (43-45 wt. %), as well as high combustion rate and temperature, making them promising as reactive materials. The obtained results underscore the important role of high-energy additives, particle size, and preparation method in controlling reaction pathways and achieving the required energy properties of the materials.
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