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对Al_2O_3–C/Fe系统在不同气氛下升温至1 973 K(1 700℃)的反应进行了研究,并对实验后的试样形貌、微区成分以及相关热力学进行分析。结果表明:在流动氩气气氛条件下,金属样品中检测出铝元素,但在高温炉进行埋炭实验后,金属样品中没有发现铝元素的存在。气氛对Al_2O_3–C/Fe系统的反应有显著的影响。高温下Al_2O_3会微量溶解到铁液中形成[Al]和[O],同时,Al_2O_3–C耐火材料中的石墨会溶于铁液中形成[C],溶解于铁液中的[C]会和[O]反应生成CO气体。在流动氩气保护的实验条件下,生成的CO气体被流动的氩气迅速带出反应体系,从而促进Al_2O_3向铁液中的溶解;但在埋炭实验条件下,反应系统中存在的CO和CO_2将抑制Al_2O_3向铁液中的溶解,实验后金属样品中只发现了碳而没有铝。
The reaction of Al_2O_3-C / Fe system heated to 1 973 K (1 700 ℃) under different atmospheres was studied, and the morphology, microstructure composition and related thermodynamics of the samples were analyzed. The results show that aluminum is detected in the metal sample under flowing argon atmosphere, but no aluminum element is found in the metal sample after burnt in high temperature furnace. Atmosphere has a significant effect on the reaction of Al 2 O 3 -C / Fe system. At high temperature, Al 2 O 3 will dissolve into the molten iron to form [Al] and [O]. At the same time, graphite in Al 2 O 3 -c refractories will be dissolved in molten iron to form [C] and dissolved in molten iron [C] Reacts with [O] to form CO gas. Under the condition of flowing argon gas protection, the generated CO gas is quickly brought out of the reaction system by the flowing Ar gas to promote the dissolution of Al 2 O 3 into the molten iron. However, under the burying carbon experiment conditions, the CO and CO_2 will inhibit the dissolution of Al_2O_3 to the molten iron, after the experiment only found in the metal samples of carbon without aluminum.