Mg、Al、Zn、Fe金属纳米粉和微米粉热重行为和燃烧热的比较研究

考察了通过多种方法分别制备的Mg、Al、Zn、Fe活泼金属纳米粉的热重行为、燃烧热等性能,并和相应的金属微米粉做了对比.结果表明:金属纳米粉(Fe、Zn、Al、Mg)比相应微米金属粉反应活性强,更容易被氧化或燃烧,且易被氧化或燃烧完全,但是纳米金属粉的金属含量低于微米金属粉;纳米金属粉的燃烧热值略大于金属微米粉,但是由于纳米铝粉含有氢氧化铝,其燃烧热值低于微米铝粉;纳米金属粉和微米金属粉都可以增加煤油的燃烧热值,但是纳米金属粉更容易分散到煤油里,燃烧以后不会象微米金属那样有结块现象.

The Comparision Study Made on the Thermal Behavior and Combustion Heat of Active Metal Nanopowders with Micropowders Including Mg,Al,Zn,Fe

Comparisons of Mg, Al,Zn and Fe nanoparticles with micropowders have been made on their thermal behavior, their heat of combustion, and their effect on the combustion heat of kerosene. The results show that metal nanopowders are more reactive,more easy to combust completely,and their combustion heats are usually higher than those micropowders. A disadvantage is in that the lower metal content in nanopowders than in micropowders, which results into the increase of combustion heat of kerosene added by nanopowders in some cases is inferior to that added by micropowders. However, the major problem for micropowders is in that they are nor dispersed in kerosene, which limited their application.