摘要
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.
出处
《科学技术与工程》
北大核心
2013年第33期9808-9812,共5页
Science Technology and Engineering
基金
上海市教委科研创新重点项目(12zz141)资助
关键词
纳米铁粉
活化能
指前因子
机理函数
nano iron powders activation energy pre-exponential factor mechanism function