摘要:
A description is given of a method for depositing a non-metallic, in particular ceramic, coating on a substrate (2) by means of cold gas spraying, which comprises the method steps of: producing a reactive gas flow (5) comprising at least one reactive gas, injecting into the reactive gas flow (5) particles (4) consisting of at least one material required for producing a non-metallic, in particular ceramic, coating material by reaction with the reactive gas, so as to form a mixture flow of reactive gas and particles (4), producing reactive gas radicals in the mixture flow, and directing the mixture flow comprising reactive gas radicals and particles onto a surface of a substrate (2) to be coated, and so a non-metallic, in particular ceramic, coating is deposited on the surface of the substrate (2). In addition, a description is given of a device (1) for carrying out the method.
摘要:
A description is given of a method for depositing a non-metallic, in particular ceramic, coating on a substrate (2) by means of cold gas spraying, which comprises the method steps of: producing a reactive gas flow (5) comprising at least one reactive gas, injecting into the reactive gas flow (5) particles (4) consisting of at least one material required for producing a non-metallic, in particular ceramic, coating material by reaction with the reactive gas, so as to form a mixture flow of reactive gas and particles (4), producing reactive gas radicals in the mixture flow, and directing the mixture flow comprising reactive gas radicals and particles onto a surface of a substrate (2) to be coated, and so a non-metallic, in particular ceramic, coating is deposited on the surface of the substrate (2). In addition, a description is given of a device (1) for carrying out the method.
摘要:
The invention relates a method in which particles (25) are fed to a thermal spraying process in order to form a layer (24) on a part (21). In the thermal spraying process, the particles (25) are entrained by a carrier gas flow (23) and are deposited on a part (21) that is to be coated. According to the invention, the particles are dispersed in a liquid or solid additive before being introduced into a supply pipe (18) that extends into the thermal spraying device, and the additive is transferred into a gaseous state in the carrier gas flow after being discharged from the supply pipe. Hence, a liquid additive evaporates while a solid additive sublimates such that the particles (25) are individualized in the carrier gas flow. Dispersing the particles in the additive advantageously makes it easier to accurately meter the particles and prevents the particles from agglomerating, thus allowing improved layers to be deposited because the carrier gas flow is more homogeneous. Transferring the additive into a gaseous state prevents the additive from being deposited in the layer.
摘要:
The invention relates to a method for repairing a component such as a turbine blade. At the end of its operating time, said component has, for example, a depletion of aluminium in a region (12) near the surface, the invention providing the application of a repair layer (19) containing particles (18) with an increased proportion of aluminium. A subsequent heat treatment can achieve the effect of equalizing the concentration of aluminium between the repair layer (19) and the region (12) near the surface, and so the aluminium content required for new components is achieved again. The component consequently has advantageous properties that are almost equivalent to those of a new component.