纳米铁粉的燃烧动力学模型研究

Kinetic Model Study on Combustion of Nano Iron Powders

利用普适积分法、微分法拟合求解50nm和500nm铁粉在10K·min-1、20 K·min-1、30 K·min-1和40 K·min-1升温速率下的燃烧动力学参数,并确定纳米铁粉燃烧反应的动力学模型和最概然机理函数.30种机理函数的计算结果表明,50nm铁粉的活化能和指前因子的数值范围分别为90～130 kJ·mol-1和103～108 s-1,500nm铁粉的活化能和指前因子的数值范围分别为160～220 kJ·mol-1和106～10“s-1,纳米铁粉的燃烧反应动力学模型为随机成核和随后生长,机理符合Avrami-Erofeev方程,最概然机理积分函数为G（α）=[-ln（1-α）]3,微分函数为f（α）=1/3（1-α）[-ln（1-α]2.

Universal integration and differentiation were used to solve the kinetiparameterof 50 nm and 500 nm iron powderundethe heating rateof 10 K · min-1, 20 K · min-1, 30 K · min-1 and 40 K · min-1 Final- ly, the kinetimodel and the mosprobable mechanism function of nano iron＇ combustion are determined. Aresulof 30 kindof mechanism functions, activation energy of 50 nm and 500 nm iron i90 - 130 kJ·min-1 and 160 - 220 kJ · mol - 1 respectively, and theipre-exponential factorare 103 - 10- l and 106 - 1011 s- 1. The com- bustion reaction model of nano iron irandom nucleation and subsequengrowth, it＇ mechanism iin line with Avrami-Erofeev equation, the mosprobable integral function iG（a） = - ln（ 1 - α） ]3 and differentialfunction f（α）=1/3（1-α）[-ln（1-α]2.