球形Al-25W合金燃料粉末的氧化行为与能量性能

Oxidation Behavior and Energy Performance of the Spherical Al⁃25W Alloy Fuel Powder

为了获得热氧化与能量释放性能优异的新型合金燃料,采用铝热还原与超高温气雾化结合的方法,制备了球形铝钨合金燃料粉末(Al-25W),对其物相结构、氧化行为及能量性能进行了研究。结果表明,球形Al-25W合金粉末颗粒内部的亚稳态Al/W合金相均匀分布在单质Al基体中,且通过稳定化处理后亚稳态Al/W合金相转变为Al12W相,并对外释放能量。球形Al-25W合金粉末具有比单质Al粉更高的氧化放热量与氧化增重,能在1400℃空气中完全氧化,且W原子全部氧化为WO3并以气态形式挥发,残留氧化产物仅为Al2O3。球形Al-25W合金粉末的实测体积燃烧焓超过单质Al粉的理论体积燃烧焓(83000 J·cm^(-3)),可达(83132.1±608.5)J·cm^(-3),且剧烈燃烧时生成气态燃烧产物WO3。

In order to obtain a new type of alloy fuel with excellent thermal oxidation and energy release performance,the spheri-cal aluminum-tungsten alloy fuel powder(Al-25W)was prepared by the combination of aluminothermic reduction and ultra-high temperature gas atomization.The phase structure,oxidation behavior,and energy properties of the alloy powder were studied.The results show that the metastable Al/W alloy phase in the spherical Al-25W alloy powder particles is uniformly distrib-uted in the pure Al matrix,and transform into the Al12W phase after the stabilization treatment,and the energy is released to the outside.The spherical Al-25W alloy powder has higher oxidation heat release and oxidation weight gain than pure Al powder.It can be completely oxidized in air at 1400℃,with all W atoms oxidized to WO3 and volatilized in the gaseous form.The residual oxidation product is only Al2O3.The measured volumetric combustion enthalpy of the spherical Al-25W alloy powder is higher than that of pure Al powder(83000 J·cm^(-3))calculated theoretically,up to(83132.1±608.5)J·cm^(-3),and the gaseous combus-tion product WO3 is generated during the violent combustion.