This paper demonstrates the capabilities of a new thermal spray process based on cold gas spraying and detonation gun technology. The method, called high-frequency pulse detonation, uses combustion pulses to heat powders to a temperature that allows good substrate-layer adhesion without the powder being melted. Superalloy, copper, and steel layers so produced are examined and compared with layers deposited by conventional thermal and cold spray processes. Paper includes a German-language abstract.

This paper describes a coating process, called internal centrifugal projection coating, in which rotating additive materials and substrate surfaces are melted by an electron beam to facilitate adhesion. It explains that the process was developed mainly to apply coatings inside engine bores and examines the microstructure of a molybdenum coating centrifugally projected onto an aluminum substrate. Paper includes a German-language abstract.

Coatings produced by suspension plasma spraying are characterized by their small grain size, which usually translates to better properties. In this study, a ceramic suspension is prepared from zirconia nanopowder and an organic solvent for use in an inkjet printer. The print head dispenses a stream of droplets, approximately 100 µm in size, that are injected into a dc plasma jet. Investigators found that the droplets disintegrate in transit and are much smaller by the time they hit the substrate. By heating the substrate surface, it is possible to create regularly shaped splats that are much smaller than those achieved by conventional plasma powder spraying. Although SEM examination revealed microcracks in some of the larger splats, no signs of cracking were observed in splats smaller than the critical diameter of 5 µm. Paper includes a German-language abstract.

In this study, nanostructured TiO 2 deposits are produced by liquid flame spraying using a two-fluid atomizing nozzle. The coatings are systematically analyzed to determine the effect of spray parameters on grain size and phase structure. Using a butyl titanate ethanol feedstock and appropriate process conditions, TiO 2 deposits have been produced with a phase concentration of more than 80% anatase and a grain size of 30 nm. Paper includes a German-language abstract.