Zur Eigenschaftsoptimierung thermisch gespritzter Schichten stehen verschiedene Nachbehandlungsverfahren zur Verfügung. In dieser Arbeit wird die plasmaelektrolytische Oxidation lichtbogengespritzter Aluminiumschichten auf Aluminiumsubstraten vorgestellt. Der Verschleißwiderstand der oxidierten Schichten wird mittels zweier Verschleißtests (ASTM G65 und ASTM C1624) beurteilt. Die Verschleißmechanismen werden anhand rasterelektronenmikroskopischer Untersuchungen ausgewertet. Die Ergebnisse der Verschleißuntersuchungen werden mit den PEO-Prozessparametern und der Mikrostruktur der Oxidschichten verglichen.Schlüsselworte: Plasmaelektrolytische Oxidation, Lichtbogenspritzen, Aluminium, Mikrohärte, VerschleißUp to now different post treatment methods are developed to improve the properties of thermally sprayed coatings. In this work, arc sprayed aluminium coatings on aluminium substrates are post-treated by plasma electrolytic oxidation. To estimate the wear resistance of resulting oxide coatings, two abrasive wear tests (ASTM G65 and ASTM C1624) are carried out. Worn surfaces are examined by scanning electron microscopy in order to establish the wear mechanisms. These results of the abrasive wear tests are correlated with the parameters of the PEO process and the resulting micro structures of the coatings.
Ion-plated aluminum oxide coatings were deposited on stainless steel substrates using superimposed radio-frequency signals and direct voltage. The deposition was achieved in a partial pressure of argon, argon–oxygen, or water vapor. Deposition rates of aluminum oxide as high as 15 μm/min were obtained. The coatings were evaluated for thermal-cycling resistance and corrosion protection to the substrate in a synthetic coal-gas mixture at 980°C. The intermediate layers of Al/Hf between the substrate and the aluminum oxide coating were ion plated to reduce the thermal spalling.
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