Electrochemical Deposition of Zirconium Diboride Coatings in NaCl-KCl-K2ZrF6-KBF4 Melts

Electrochemical Deposition of Zirconium Diboride Coatings in NaCl-KCl-K2ZrF6-KBF4 Melts
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NaCl-KCl-K2ZrF6-KBF4 熔体中电化学沉积二硼化锆涂层

DOI:
10.1149/2.1241610jes
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发表时间:
2016
影响因子:
3.9
通讯作者:
Zeng Chao Liu
Zeng Chao Liu
中科院分区:
工程技术4区
文献类型:
--
作者:
Wang Qian;Wang Yan Li;Liu Hui Jun;Zeng Chao Liu

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二硼化锆是一种极具发展前景的超高温陶瓷材料,在高超声速飞行、大气再入和火箭推进等领域有着重要的应用前景。在本工作中,通过在NaC l-KCl-K2-ZrF6-KBF4熔体中电化学沉积,在不同的衬底上成功地获得了二硼化锆涂层。利用扫描电子显微镜、能谱分析和X射线衍射仪研究了电流密度、工作温度、电沉积时间和基材对涂层组织和物相组成的影响。此外,还用循环伏安法和计时电位法研究了锆、硼和二硼化锆的电化学还原过程。结果表明,在不锈钢、石墨和碳纤维增强碳复合材料(C/C复合材料)上可以制备出不同形貌和结构的ZrB2涂层,其合成主要经历两次电化学反应和一次化学反应。
Zirconium diboride is one of the most promising ultra high temperature ceramics, which are urgently required in the development of hypersonic flight, atmospheric re-entry and rocket propulsion. In this work, the zirconium diboride coating is successfully obtained on different substrates by electrochemical deposition from a NaCl-KCl-K 2 ZrF 6-KBF 4 melt. The effects of current density, operating temperature, electrodeposition time and substrate materials on the microstructure and phase composition of the coating are also investigated by SEM, EDX, and XRD. Besides, the electrochemical reduction of zirconium, boron and zirconium diboride has been investigated by cyclic voltammetry and chronopotentiometry. The results show that various morphological and structure of ZrB 2 coatings can be synthesized on stainless steel, graphite and carbon fiber reinforced carbon composite (C/C composite) substrates and the synthesis of ZrB 2 mainly follow two subsequent electrochemical reactions and a chemical reaction.
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