Gas phase coating process and apparatus for gas-phase coating of workpieces
AssigneeMTU Motoren-und Turbinen-Union Munchen GmbH
InventorHeinrich Walter
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Abstract
In a gas phase coating process for coating turbines blades or housing parts, one or more workpieces to be coated are arranged in a container that is heated. Propellant is supplied to the container via a propellant pipe. A donor substance is arranged at the floor of the container together with an activator and forms a coating gas that is circulated pulse-like in the interior of the container by means for circulation, for example, a Venturi nozzle from which the propellant emerges.
Claims17
A process for applying a coating gas to at least one workpiece, the process comprising the steps of:
- providing a container having a Venturi nozzle disposed therein and containing the at least one workpiece, a donor substance, and an activator;
- heating the container, donor substance and activator to form the coating gas from the donor substance;
- and
- circulating the coating gas within the container by injecting a propellant into the container through the Venturi nozzle, the propellant being selected from the group consisting of Ar, He, Kr, Ne and H2.
The process of claim l wherein the activator is NH4Cl.
Dependencies are inferred from the claim text.