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首页> 外文会议>International Conference on Surface Modification Technologies >Ceramic Coatings with Zirconium Fine Particles on Aluminium and Magnesium by Plasma Electrolytic Oxidation
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Ceramic Coatings with Zirconium Fine Particles on Aluminium and Magnesium by Plasma Electrolytic Oxidation

机译：陶瓷涂层用铝和镁的氧化锆细颗粒通过等离子体电解氧化

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摘要

Composite ceramic coatings were formed on aluminium and magnesium alloy by DC and AC plasma electrolytic oxidation using phosphate or silicate electrolytes with monoclinic zirconia fine particles in suspension. The resultant coating microstructures were examined with high resolution scanning electron microscopy in order to investigate the mechanism of coating formation. Phase transformations of zirconia, identified by X-ray diffraction, were used to determine the thermal impact of the microdischarges on the coatings. Thermal impact was related to the lifetimes of the discharges, determined with a high speed video camera. The coatings are shown to comprise two main layers, with fine zirconia particles entering the coating at the coating surface and being transported through short-circuit paths to the interface between the inner and outer coating layers. Local melting of the coatings was observed, resulting in formation of zirconium-rich dendrites in all cases. Tetragonal and orthorhombic zirconia, in addition to the monoclinic phase, was indicative of elevated temperatures at sites of microdischarges in DC and AC regimes. Cubic zirconia was only found in the coatings formed in the AC mode at high current densities of about ～60A/dm~2. Mg_2Zr_5O_(12) was formed in the outer layer of the coating formed on magnesium alloy.
机译：在悬浮液中使用磷酸盐或硅酸盐电解质通过DC和AC等离子体电解氧化在铝和镁合金上形成复合陶瓷涂层。用高分辨率扫描电子显微镜检查所得涂层微观结构，以研究涂层形成的机理。通过X射线衍射鉴定的氧化锆的相变，用于确定微探测器对涂层上的热撞击。热冲击与放电的寿命有关，用高速摄像机确定。涂层被示出为包括两个主要层，具有细氧化锆颗粒在涂层表面进入涂层并通过短路路径传送到内涂层之间的界面和外涂层之间的界面。观察到涂层的局部熔化，导致所有情况下形成富含锆的树枝状。除了单斜相外，四边形和正交氧化锆还指示DC和AC制度的微探测点的升高的温度。立方氧化锆仅在AC模式中形成的涂层中，高电流密度为约〜60a / dm〜2。 Mg_2ZR_5O_（12）形成在镁合金上形成的涂层的外层中。

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