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利用TGA、SEM研究了化学链燃烧中Fe氧化反应过程产物层的生长机理,以及产物层形貌对化学反应动力学的影响。考虑了不同的反应条件,包括氧化时间、反应温度、O_2浓度的影响。实验结果表明,氧化产物呈三维岛状生长,反应初期产物岛较小但密度较大,随着反应的进行,产物岛不断长大,但密度先减小后增加;温度及O_2浓度对产物层生长均有影响。产物岛的成核与生长改变了产物层的表观形貌,减小了表观反应速率。
The growth mechanism of the product layer during the oxidation reaction of Fe in chemical combustion and the influence of the product layer morphology on the chemical reaction kinetics were studied by TGA and SEM. Different reaction conditions were considered, including the effect of oxidation time, reaction temperature and O 2 concentration. The experimental results show that the product of oxidation grows in the form of three-dimensional island. The product island is smaller but the density is larger at the beginning of the reaction. With the progress of the reaction, the product island keeps growing, but the density first decreases and then increases. Growth has an impact. The nucleation and growth of the product island changed the apparent appearance of the product layer and reduced the apparent reaction rate.