Flux-Mediated Wetting of Alumina by Liquid Fe–Ti–Csat,Steel Research International

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Flux-Mediated Wetting of Alumina by Liquid Fe–Ti–Csat
Steel Research International ( IF 1.9 ) Pub Date : 2021-06-18 , DOI: 10.1002/srin.202100068
Steven Thomas Britt ₁ , Petrus Christiaan Pistorius ₁

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Metals do not wet oxides as a general rule. Exceptions to this occur in the presence of dissolved species or chemical reactions. Fe–C_sat–Ti is seen to wet alumina crucibles but not crucibles of graphite or MgO. This is determined to be macroscopically due to reactive wetting of the ternary alloy on Al₂O₃; microscopically, the reaction formed a nanoscale layer of TiC on Al₂O₃, with the hot metal wetting the TiC substrate. Molten fluxes offer a way to mitigate the wetting of the alumina crucible by preventing the reaction. The liquid-state Al₂O₃–CaF₂ flux wets the Al₂O₃ crucible, coating both the crucible walls and bottom. This is effective in preventing wetting despite alumina activity being unity in the initial components. The volatilization of fluorine results in a calcium aluminate coating on the original crucible. Using the molten flux is more effective than sintering CA particles onto the crucible bottom because the liquid flux coated the crucible walls. Though wetting is a problem in industry, this offers practical mitigation of wetting using a flux coating.

中文翻译：

液态 Fe-Ti-Csat 对氧化铝的通量介导润湿

作为一般规则，金属不会润湿氧化物。在存在溶解的物质或化学反应的情况下会出现例外情况。Fe-C _sat -Ti可以润湿氧化铝坩埚，但不能润湿石墨或 MgO 坩埚。这在宏观上确定是由于三元合金在 Al ₂ O ₃上的反应润湿；_{在显微镜下，该反应在 Al 2} O ₃上形成了纳米级 TiC 层，其中热金属润湿了 TiC 基底。熔融焊剂提供了一种通过防止反应来减轻氧化铝坩埚润湿的方法。液态 Al ₂ O ₃ –CaF ₂助熔剂润湿 Al ₂ O ₃坩埚，涂层坩埚壁和底部。尽管氧化铝活性在初始组分中是统一的，但这在防止润湿方面是有效的。氟的挥发导致原始坩埚上形成铝酸钙涂层。使用熔融焊剂比将 CA 颗粒烧结到坩埚底部更有效，因为液体焊剂覆盖了坩埚壁。尽管润湿是工业中的一个问题，但这提供了使用助焊剂涂层实际缓解润湿的方法。

更新日期：2021-06-18

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