化学液相沉积法制备Fe包覆Al复合粉体

Preparation of Fe/Al Composite Powder by Chemical Liquid Deposition Method

以羰基铁(Fe(CO)5)为前驱体,采用化学液相沉积法,在自行设计的装置中实现了Fe纳米粒子在微米Al粉表面快速、均匀的沉积,制备出了具有核壳结构的Fe/Al微纳米粒子。利用XRD、SEM和TG/DTA对产物进行了相应的表征,并对不同Fe、Al物质的量比的制备情况进行了研究。结果表明,所得Fe/Al复合粉体的结晶性能良好;铝颗粒表面明显被一层Fe壳致密包覆,且包覆的铁层呈团粒状;Fe/Al微纳米复合粉体与O2反应的活性明显高于原料Al粉,放热量以及增重均得到大幅度提高,热量释放更快速、更集中,燃烧过程得到明显改善。n(Fe)∶n(Al)=0.5∶1时的放热量最大,放热性能最优。

Abstract Core-shell structured Fe/A1 composite powders were successfully fabricated by chemical liquid depo- sition method with iron pentacarbonyl （Fe（CO）s） as the precursor in a selfdesigned processing system. Property chara- cterizations were performed with X-ray diffraction （XRD）, scanning electron microscopy （SEM） and simultaneous thermogravimetry-differential thermal analysis （TG-DTA）. Fe/A1 composite powders with different mole ratio of Fe to A1 were discussed. Results show that A1 powders were coated with a fine layer of Fe and the oxidation kinetic is significantly improved over pure A1 powders. In addition, compared to pure A1 powders, the Fe/A1 composite pow- ders have much higher reactivity, exothermal and weight gaining capabilities. Heat can be released in a much faster and more concentrated way which considerably improves the combustion process. Composite powder with n （Fe） ：n（Al）=0. 5 ： 1 has the maximum heat release and weight gain.