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铝粉多样化氧化的机理
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| Thermal analysis is widely used to establish rates and mechanisms of oxidation of metal powders. For heterogeneous oxidation of aluminum, reaction may occur at the outer or inner surface of the growing oxide layer, depending on whether metal or oxidizer diffuse faster through that layer. A methodology of processing thermo-analytical measurements is introduced to distinguish such differences in the oxidation mechanism. The entire size distribution is considered for two spherical aluminum powders with different but overlapping particle sizes. The measured weight gain is distributed among particles of different sizes assuming that the rate of oxidation is proportional to the current reactive interface area. Three models are considered to determine the interface area. Weight gains for the same size particles from different powders were expected to be identical to each other when the model described the true oxidation mechanism. The results show that the reaction at the outer surface of a rigid oxide shell accurately describes the experiments. Thus, the outward diffusion of aluminum ions controls the rate of heterogeneous oxidation of aluminum in a wide range of temperatures from 400 – 1500°C. |
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2017-02-22 15:36:55, 430.81 K
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