緻密なウスタイトの水素還元挙動におよぼす Al_2O_3 および Al_2O_3 と CaO 同時添加の影響

概要

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The dense wustite plates containing Al_2O_3 or Al_2O_3-CaO have been reduced isothermally in H_2 gas in the temperature range from 670 to 930℃. In the case that 0.5%Al_2O_3 are added, all of the added Al_2O_3 are dissolved in FeO phase. This dissolved Al_2O_3 promotes the formation of dense iron covering the FeO surface and slows down the reduction rate of FeO phase. In the case that Al_2O_3 are added above 1%, hercynite precipitates in the samples and accelerates the reduction of FeO phase. The rate of the reduction of the samples containing 5%Al_2O_3 are slightly larger at the temperatures above 890℃ and smaller at the temperatures up to 800℃ than that of the pure FeO. The rate of the reduction of the samples containing Al_2O_3 and CaO increases with increase in the concentration of the dissolved CaO because the effect of the dissolved CaO that promotes the formation of porous iron layer becomes larger than that the above mentioned effect of the dissolved Al_2O_3.
社団法人日本鉄鋼協会の論文
1987-12-01