Abstract This paper contributes to the broadening of knowledge about process combinations in connection with thermally sprayed coatings. It describes the influence of a later annealing, nitriding, and carburizing on different thermal sprayed coatings. The connection between the processes is determined and optimal process parameters is adjusted for both processes. The paper analyzes the coating characteristics and the alterations of the substrate. The results of the metallographic and X-ray analysis as well as of the wear and corrosion tests are discussed. Prospects for possible further applications are given. Paper includes a German-language abstract.

Abstract In this paper, different aluminum phosphate sealing treatment temperatures and substrate preheating temperatures are used to produce different coating properties. X -ray residual stress analyzer is used as a NDT inspection method to find out undesired coating defects. The wear properties of plasma-sprayed aluminum oxide and chromium oxide coatings are studied as a function of spray parameters and post-treatments. The residual stress states are associated with other coating properties such as dry wear resistance. Hardness and porosity as well as microstructure compared. The aim of this paper is to find connections between residual stresses and other coating properties. It was observed that there is good correlation between stress state, abrasion resistance and sealing treatment temperature when considering chromia coatings. Paper includes a German-language abstract.

Abstract In this paper results of the alloying of magnesium materials by a combination of thermal spraying and a subsequent electron beam surface technology are presented. The objective is to improve the wear resistance of magnesium alloys. Aluminium and copper were chosen as the alloying material. These metals can form hard intermetallic compounds with magnesium, such as MgAl2 or Mg2Cu. The vacuum plasma spraying is well suited for the deposition of these additives because of the prevention of their oxidation. Besides, the EB technology take place under vacuum conditions, and the reactions between magnesium and oxygen are prevented. Paper text in German.

Abstract This paper describes the technique of anisotropic multiple small-angle neutron scattering (MSANS). Anisotropic MSANS, when combined with anisotropic Porod scattering, electron microscopy, and measurements of elastic modulus and density, has made possible the determination of the porosities, surface areas, mean opening dimensions, mean diameters, and approximate orientation distributions, of the intra-splat cracks and interlamellar pores, as well as the porosity, surface area, and mean diameter, of the globular pores. The changes in these parameters, as a function of annealing, are studied. Paper includes a German-language abstract.

Abstract In this paper, as a basic study of the plasma jet process under a low pressure, the nitriding of titanium plates and atmospheric plasma sprayed titanium coatings are carried out using nitrogen and hydrogen added nitrogen plasma jets at 30Pa. The plasma torch used in this paper is equipped with a supersonic expansion nozzle to improve the acceleration efficiency of plasma jets. The effects of ambient pressures and supersonic expansion nozzles on transformation of plasma particles are examined from gas-dynamical viewpoints. It was observed that from the results, the supersonic plasma jet process under a low pressure was proved to have a high potential for nitriding. Paper includes a German-language abstract.