Method for producing a near-surface cooling passage in a thermally highly stressed component, and component having such a passage

A method for producing a near-surface cooling passage in a thermally highly stressed component, the method comprising:

• a) providing a component which has a surface configured to face a hot side in a region which is to be cooled and a surface configured to face a cool side in the region to be cooled;
• b) forming a channel into the surfaces to extend from the cool side to the hot side with a cooling medium inlet on the cool side and a cooling medium outlet on the hot side and including a first passage section extending from the cooling medium inlet on the cool side into an interior of the component, a second passage section adjoining the first passage section and extending essentially parallel to the surface which is to be cooled, and a third passage section adjoining the second passage section and terminating in the cooling medium outlet on the hot side;
• c) inserting a cooling tube into the channel;
• d) filling the channel, with the cooling tube inserted, with a temperature-resistant filling material in such a way that the inserted cooling tube is embedded into the filling material, leaving free an inlet and an outlet;
• and
• e) covering the channel, with the cooling tube embedded, with an anti-oxidation, temperature-stable cover layer.