Al-W合金燃料的氧化过程及性能提升机理OACSTPCD

To elucidate the promotion mechanism of the oxidation performance of the Al-W alloy fuel,Al-20W and Al-30W al-loy fuels were prepared by the aluminum thermal reduction and the ultra-high temperature gas atomization,and their oxidation process were studied by thermogravimetric/differential thermal analysis,X-ray diffractometer,and scanning electron microscope/energy dispersive spectrometer.The results indicate that Al-20W and Al-30W alloy fuels both contain metastable Al/W alloy phases,and the types and morphology of the Al/W alloy phases transform with increasing temperature.Al-20W and Al-30W al-loy fuels have better thermal oxidation performance than pure Al fuel,with complete oxidation at 1300℃and 1500℃,respec-tively,and all oxidation products WO3 volatilizing.The presence of W enhances the oxidation performance of the Al-W alloy fu-els.The promotion mechanism includes:the volatilization of WO3 provides channels for O2 to diffuse into the interior of the par-ticles.As an"O atoms transport ship",WO3 transports O atoms to the pure Al phase,promoting the oxidation of the pure Al phase.WO3 undergoes further chemical reactions and ultimately volatilize in a gaseous form,promoting the oxidation of the phase containing W.