Cold gas spraying, which has found its way into industrial production, enables the rapid production of various layer systems almost at room temperature. With this method, the errors can be avoided and layers with low porosity and a lower degree of oxidation can be produced. A novel technology of the hot injection process combines the advantages of cold gas and conventional injection processes. With this technology, the powders used are greatly accelerated and heated up to a temperature that allows good substrate-layer adhesion without the powder being melted. Hot-sprayed layers of superalloys, copper, and steel with the high frequency pulse detonation spray gun are shown in this paper. The advantages of the layers produced in this way are compared with those produced with conventional or cold spray processes. The result is interesting novel materials and surface coating options. Paper includes a German-language abstract.

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