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Wetting of graphite by molten Cu–xSn–yCr ternary alloys at 1373 K
Carbon ( IF 10.9 ) Pub Date : 2020-04-01 , DOI: 10.1016/j.carbon.2019.12.097
Qiaoli Lin , Fan Yang , Hongyu Yang , Ran Sui , Yu Shi , Jianbin Wang

Abstract This paper presents an experimental approach where the effect of Cr and Sn concentrations on the wetting of graphite by molten Cu-xSn-yCr ternary alloys at 1373 K. It shows that a small quantity of Cr addition (≤2 at.%) can improve the wettability significantly owing to the formation of chromium carbides at the interface. Sn addition (x ≤ 30 at.%) can further improve the wettability by decreasing the surface tension. However, higher Sn concentration (x ≥ 40 at.%) will cause the precipitation of main phase at the interface, varying from Cr7C3 to Cr3C2, which in turn will slightly deteriorate the wettability. The phase equilibrium transition point (x ≈ 35% in Cu–xSn–1Cr/Cgraphite) is responsible for wettability variation by the increase of Sn concentration. When the Sn concentration is ≥ 40 at.%, the spreading dynamics are satisfied with the assumption of the classical diffusion-limited spreading model. When the Sn concentration is ≤ 30 at.%, the transport route of Cr is from the Sn segregation layer on the drop surface to the triple line rather than from the internal diffusion of the bulk drop to the triple line, and then a precursor film with the specific width can be formed.

中文翻译:

熔融的 Cu-xSn-yCr 三元合金在 1373 K 时对石墨的润湿

摘要 本文提出了一种实验方法,其中 Cr 和 Sn 浓度对熔融 Cu-xSn-yCr 三元合金在 1373 K 时对石墨润湿的影响。结果表明,少量的 Cr 添加(≤2 at.%)可以由于在界面处形成了碳化铬,显着提高了润湿性。添加 Sn (x ≤ 30 at.%) 可以通过降低表面张力进一步提高润湿性。然而,较高的Sn浓度(x≥40at.%)会导致界面处主相析出,从Cr7C3到Cr3C2变化,这反过来会略微降低润湿性。相平衡转变点(在 Cu-xSn-1Cr/Cgraphite 中 x ≈ 35%)是导致润湿性随 Sn 浓度增加而变化的原因。当Sn浓度≥40at.%时,传播动力学满足经典扩散限制传播模型的假设。当 Sn 浓度≤ 30 at.% 时,Cr 的传输路径是从液滴表面的 Sn 偏析层到三重线,而不是从块状液滴的内部扩散到三重线,然后是前驱体薄膜可以形成特定的宽度。
更新日期:2020-04-01
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