The increasing use of magnesium alloys in many engineering applications is mainly limited by their unsatisfying surface properties, especially the poor tribological properties and the poor corrosion resistance. Therefore an effective and well designed coating technology has to be adapted to allow a successful implementation of magnesium alloys under tribological load and in an corrosive environment. This presentation gives an overview of the performance of different functional metallurgical and ceramic coatings on magnesium diecastings which are applied by atmospheric plasma spraying (APS) and high velocity oxygen fuel spraying (HVOF).

This paper presents the results of metal dielectric multilayer structures based on aluminum alloys and several oxide ceramics respectively. It investigates thermomechanical and dielectric properties with regard to the use of different powders for thermal spraying as well as a high and a low energy gun for atmospheric spraying. The experimental work of this study is divided into two main parts: the selection of materials and the development of promising coating systems and the manufacturing and testing of novel ozonizer tubes. The investigated coating systems are analysed focusing the application in ozonizers. Therefore, a metallic electrode, an oxide ceramic and the dielectric properties of the metal-ceramic-composite are analysed. Finally, the appropriate metal-ceramic composites are tested in an ozonizer. Paper includes a German-language abstract.

This paper discusses the development of a metal-coated glass tube that produces ozone more economically than traditional methods. It describes the principle of ozone generation, provides information on ozonizer tubes, and presents the criteria for selecting thermal spray powders. It examines the properties of several multilayer coatings consisting of an oxide ceramic top layer, an Al/Si interlayer, and a borosilicate glass substrate. It was found that the porosity and surface roughness of the oxide layer have a significant impact on the dielectric strength of the composite and the efficiency of the ozone-producing tube.