Self-healing effects by the Ce-rich precipitations on completing defective boundaries to manage microstructures and oxidation resistance of Ni-CeO2 coatings
Self-healing effects by the Ce-rich precipitations on completing defective boundaries to manage microstructures and oxidation resistance of Ni-CeO2 coatings
复制标题
富 Ce 沉淀对完善缺陷边界的自修复作用，以管理 Ni-CeO2 涂层的微观结构和抗氧化性
DOI：
10.1016/j.surfcoat.2017.02.024
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发表时间：
2017-04
影响因子：
5.4
通讯作者：
Ouyang Chun
中科院分区：
文献类型：
--
作者：
Zhou Xiaowei;Ouyang Chun
本文提出了一种利用脉冲电沉积在纯钛基体活化表面上电镀涂层的有效方法。针对Ti基体表面陶瓷状TiO2阻挡层抑制表面活性的问题，提出了一种由HF、HCl、Ce(NO3)2、TiCl3和bal组成的新型活化溶液。采用DMF溶剂对Ti基体进行表面改性，以提高表面Ni涂层的界面结合强度。此外，还对不添加和添加 CeO2 的 Ni 纳米晶涂层进行了比较研究，以揭示富 Ce 相在 800 或 1000 °C 氧化过程中控制微观结构和高温抗氧化性的作用。结果表明，沿晶界 (GB) 分散的富 Ce 沉淀有利于在 800 °C 氧化过程中完成 Ni-CeO2 纳米复合涂层上氧化层的剥落。此外，还验证了分析模型，以便更好地了解沿着GBs缺陷的富Ce沉淀，以监测氧化机制。此外，这一发现将有助于制定富铈沉淀强化镍基高温合金的指南。
This paper presented an effective approach for electroplating of coatings on the activated surface of pure Ti substrate using pulsed electro deposition. Regarding the ceramic-like TiO2barrier layer on its surface of Ti substrate to inhibit surface activity, a novel activating solution that composed of HF, HCl, Ce(NO3)2, TiCl3, and bal. DMF dissolvent was applied for surface modifications of Ti substrate in order to increase interfacial bonding strength of surface Ni coatings. Besides a comparative study of Ni nanocrystalline coatings without and with CeO2addition was carried out for disclosing the role of the Ce-rich phase on managing microstructure and high-temperature oxidation resistance during oxidation at 800 or 1000 °C. Results indicated that Ce-rich precipitations, where dispersed along grain boundaries (GBs), were favorable for completing the spalling oxide-layers on Ni-CeO2nanocomposite coatings during oxidation at 800 °C. Furthermore, an analytical modeling was validated for better understanding of Ce-rich precipitations along GBs defects for monitoring oxidation mechanisms. Furthermore, this finding would be therefore leading to the guidelines for Ce-rich precipitations on the strengthening of Ni-based superalloys.
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影响因子：
6
作者：
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通讯作者：
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影响因子：
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影响因子：
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作者：
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通讯作者：
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影响因子：
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