Anodic spark deposition

Gorges et al. [155] introduced anodic spark deposition (ASD), a modification of anodic oxidation, for the formation of polycrystalline ceramic oxide layers on passivating metals (Figure 2.99). The method is therefore limited to Ti, Al and Zr... 

Gorges, R., Kassbohrer, J., Kreisel, G., Meyer, S., Surface-functionalization of microstructures by anodic spark deposition, in Proceedings of the 6th International Conference on Microreaction Technology, IMRET 6 (11-14 March 2002), AIChE Pub. No. 164, New Orleans, 2002,186-191. 

The anodic oxidation under spark discharge, known as the ANOF technique [14,15], is a relatively new and promising alternative for the synthesis of catalytic oxide layers on metallic supports [13,16,17] in which the drawbacks of classic anodic oxidation are eliminated. Plasma-electrochemical processes in which hard melting oxidic coating with a very good meehanieal and chemical resistance are deposited on a metallic substrate are also known in the literature as anodic spark deposition [17,18] or micro-arc oxidation [18]. 

The main deposition methods of NS-Ti02 onto stainless steels are cathodic arc deposition [532], electrophoretic deposition [533], anodic spark deposition (ASD) [534], the sol-gel method [535, 536], atmospheric pressure metal organic CVD (AP-MOCVD) [537, 538] and radio frequency (RF) magnetron sputtering [539]. Preparation methods and applications of NS-Ti02 thin films on stainless steel have been summarized in Table 15. 

Anodic spark deposition Photocatal3dic degradation of aqueous solution of 4—chlorophenol [534]... 

S. Meyer, R. Gorges, G. Kreisel, Preparation and characterisation of titanium dioxide films for catalytic applications generated by anodic spark deposition . Thin Solid Films. 450, 276-281, (2004). 

Gorges et al. described the immobilization of a photocatalytically active titanium dioxide catalyst by anodic spark deposition [14]. Figure 16.3 depicts a cross-section through a microchannel that has been coated in this fashion with a Ti02 layer. 

Upon voltage application, an arc sparks over between the graphite electrodes. It transfers material from the anode into the gas phase, which then can deposit in shape of the desired nanotubes. A certain portion forms a deposit on the cathode, but condensation also occurs at other places within the reaction chamber. The graphite anode is used up in the course of the reaction, and so a continuous read-... 

Button-size cells were manufaetured using both traditional and advanced (spark plasma) sintering techniques. Half cells eonsisting of eleetrolyte and anode were made by means of SPS and cathodes were applied afterwards by means of electrophoretie deposition. Polarization characteristics of cathode materials were obtained and analyzed with a due regard for their composition and microstructure. 

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