Abstract
The surface microstructure, heat of combustion and thermogravimetric (TG) curves of different size iron powders were obtained through BET, combustion and thermogravimetry experiments of iron powders of the size 50, 100, 500 and 20×10 3 nm. The effects of the size on specific surface area and heat of combustion were analyzed. The combustion characteristic and kinetic parameters of different size iron powders at heating rate of 10, 20, 30 and 40 K/min were mainly studied. The results show that the specific surface area and heat of combustion are increased with the decrease of size, and the heat of combustion reaches the maximum value of 6 792.1 J/g when the size is 50 nm. As the size increases, the temperatures of ignition, maximum combustion rate and burnout are increased and burnout time is prolonged. As the heating rate increases, the ignition temperature, the temperature of maximum combustion rate and burnout temperature at the same size are increasing. Maximum combustion rate of nano iron powders is increased while that of micron iron powders is decreased. There is mutual compensation effect between activation energy and pre-exponential factor, and both are increased with the increase of size and heating rate.
| Original language | English |
|---|---|
| Pages (from-to) | 88-92 |
| Number of pages | 5 |
| Journal | Shanghai Ligong Daxue Xuebao/Journal of University of Shanghai for Science and Technology |
| Volume | 34 |
| Issue number | 1 |
| State | Published - Feb 2012 |
| Externally published | Yes |
Keywords
- Heat of combustion
- Micron iron powders
- Nano iron powders
- Specific surface area
- Thermogravimetric analysis