含Cr或/和Al金属纳米颗粒在制备高温涂层中的应用

Application of Cr-or/and Al-containing Nanoparticles to Fabricate High Temperature Coatings

基于金属选择性氧化理论,提出了利用含Cr或/和Al金属纳米颗粒与M(M=Ni、Co或两者组合)复合电沉积制备M-Cr、M-Al以及M-Cr-Al高温涂层的新概念。此类高温涂层由纳米晶M基体与弥散分布其中的含Cr或/和Al金属纳米颗粒组成,这种特殊纳米复合结构可以促进涂层在高温下发生Cr或Al的选择性氧化,并由此进一步提出“电泳+电沉积”的方法制备高Cr和Al含量的MCrAl纳米复合涂层。本文对相关研究进行了评述,对利用简单的“双电”复合沉积方法制备具有长寿命使役稳定性的MCrAlY(Y_(2)O_(3))/扩散障体系研究进行了展望。

Based on the theory of selective oxidation of metals, a new concept of electrodepositing M-Cr, M-Al, and M-Cr-Al high temperature coatings with Cr or/and Al nanoparticles with M(M = Ni, Co or their combination was proposed. The coatings are composed of a nanocrystalline M matrix and numerous dispersed Cr or/and Al nanoparticles, and the unique nanostructure promotes the selective oxidation of Cr or Al at high temperatures. On this basis, a two-step method consisting of “electrodeposition +electrophoretic deposition” was proposed to develop MCrAl nanocomposite coatings containing high contents of Cr and Al. In this paper, the related research and recent progress are reviewed, and the prospects of applying the combined deposition method to fabricate novel MCrAlY(Y_(2)O_(3))/diffusion barrier system with long-term service stability are summarized.