Wear-resistant coatings on aluminium produced by plasma anodising—A correlation of wear properties, microstructure, phase composition and distribution
Wear-resistant coatings on aluminium produced by plasma anodising—A correlation of wear properties, microstructure, phase composition and distribution
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DOI：
10.1016/j.surfcoat.2013.12.021
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发表时间：
2014-02
影响因子：
5.4
通讯作者：
M. Sieber;T. Mehner;D. Dietrich;G. Alisch;D. Nickel;D. Meyer;I. Scharf;T. Lampke
中科院分区：
文献类型：
--
作者：
M. Sieber;T. Mehner;D. Dietrich;G. Alisch;D. Nickel;D. Meyer;I. Scharf;T. Lampke
近几十年来，已经发现了用于铝表面的等离子体阳极化以产生耐磨氧化铝涂层的各种工艺窗口。涂层具有高硬度，并与基材材料具有良好的结合力，从而防止在机械或摩擦负载下剥落。在本研究中，在电流密度为30 A/dm 2的5 g/l偏硅酸钠和5 g/l氢氧化钾的电解质中产生具有高耐磨性和高达12 GPa的硬度的涂层。为了了解高耐磨性的原因，使用常规和掠入射的X射线衍射和电子背散射衍射，在全局和局部检查涂层内的形态以及相组成和分布。分析表明，涂层总体上由约三分之一的α-氧化铝、三分之一的γ-氧化铝和三分之一的无定形氧化铝组成，并具有局部变化的相含量。
In the recent decades, various process windows have been found for plasma anodising of aluminium surfaces to produce wear-resistant alumina coatings. The coatings offer a high hardness and provide an excellent bonding to the substrate material, thus preventing spallation under mechanical or tribological load. In the present study, coatings with a high abrasive wear resistance and a hardness of up to 12 GPa were produced in an electrolyte of 5 g/l sodium metasilicate and 5 g/l potassium hydroxide at a current density of 30 A/dm2. To understand the reasons for the high wear resistance, the morphology as well as the phase composition and distribution within the coating were examined globally and locally using X-ray diffraction with conventional and grazing incidence and electron backscatter diffraction. The analyses show that the coating globally is comprised of approximately one third ofα-alumina, one third ofγ-alumina and one third of amorphous alumina with locally varying phase content.