Non-Isothermal Kinetic Analysis of Oxidation of Pure Aluminum Powder Particles

Non-isothermal kinetic analysis of oxidation of aluminum powder particles (100-200 mu m) was investigated by simultaneous thermogravimetry (TG) and differential thermal analysis under linear temperature programming (ranging from 25 to 1,400 A degrees C) at different heating rates (10, 20 and 30 A degrees C/min). In addition, the rate of oxidation reaction (rate of thermogravimetry; RTG) was obtained by the RTG curves. It was found that the oxidation of aluminum powders took place over several stages and the complete oxidation process did not occur even up to 1,400 A degrees C. Among different stages, the temperature ranging from 1,000 to 1,150 A degrees C was identified as the main stage for oxidation process. Hence, kinetic analysis of non-isothermal was determined to be carried out in this region only. Therefore, non-isothermal kinetic analysis of oxidation of pure aluminum powder particles was performed using isoconversional methods (Flynn-Wall-Ozawa, Kissinger-Akahira-Sunose, Friedman ), Markworth and Coats-Redfern methods. Also, the empirical kinetic triplets [E (a) , A, and f(alpha)] have been calculated.