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首页> 外文期刊>Journal of Materials Engineering and Performance >The Formation and Frictional Behavior of Ni and Cu Aluminide Coatings on Copper
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The Formation and Frictional Behavior of Ni and Cu Aluminide Coatings on Copper

机译：Ni和Cu铝涂层对铜的形成和摩擦行为

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摘要

The microstructure and frictional behavior of candidate protective coatings for steel continuous casting copper molds were studied. A number of conventional coatings, consisting of the hard chromium deposited by electroplating, nickel-phosphorus deposited by electroless plating, and WC-17Co deposited by high-velocity oxy-fuel spraying, were compared with copper aluminide and nickel aluminide coatings. The copper aluminide coating was formed via pack cementation diffusion and aluminized in the Al-AlCl3-Al2O3 powder mixture at 500 degrees C. The nickel aluminide coating was obtained using the same aluminizing treatment, yet after depositing an electroless nickel-phosphorus interlayer. The microstructure of the coated specimens was characterized by scanning electron microscopy, energy-dispersive x-ray spectroscopy and x-ray diffraction phase analysis. Cu9Al4 was identified as the main phase of the copper aluminide coating, whereas Ni2Al3 and NiAl phases were identified in the nickel aluminide coating. The evaluation of the coatings frictional behavior through a pin-on-disk machine applying a 12 N loading showed that the copper aluminide coating is worn away and that the nickel aluminide coating remains intact up to the end of the test. The reference coatings revealed negligible wear with the material transfer from the pin to their surface. The copper aluminide coating demonstrated the least friction coefficient among the entire evaluated coatings.
机译：研究了钢-连铸-铜结晶器候选保护涂层的微观结构和摩擦性能。比较了电镀硬铬、化学镀镍磷和高速氧燃料喷涂WC-17Co等传统涂层与铜铝化物和镍铝化物涂层的性能。铜铝化物涂层通过填充渗碳扩散形成，并在500℃下在Al-AlCl3-Al2O3粉末混合物中进行铝化。镍铝化物涂层使用相同的铝化处理获得，但在沉积化学镀镍磷中间层之后。通过扫描电子显微镜、能量色散x射线光谱和x射线衍射相分析对涂层试样的微观结构进行了表征。铜铝化物涂层中的主要相为Cu9Al4，而镍铝化物涂层中的主要相为Ni2Al3和NiAl。通过销盘式试验机施加12 N载荷对涂层的摩擦性能进行评估，结果表明，铜铝化物涂层已磨损，镍铝化物涂层在试验结束前保持完整。参考涂层显示，材料从销转移到其表面时，磨损可忽略不计。在整个评估涂层中，铜铝化物涂层的摩擦系数最小。

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