Patent ID: 8157526

Claim:
A component having a film cooling hole, comprising: a component substrate; and a layer arranged on the substrate where the film cooling hole comprises a diffuser in an outer region and a hot gas flows over the film cooling hole in an overflow direction, the film cooling hole comprising a lower part, and the diffuser adjoins the lower part as part of the film cooling hole and wherein, the diffuser is substantially arranged in the layer, an overall length of the diffuser as measured along a normal to the outer surface of the layer includes a first length which is completely arranged in an overall coating thickness and a second length which is arranged in the substrate whereby the first length is significantly less than the second length, the diffuser widens in the plane of the outer surface of the layer in an overflow direction at an angle to the overflow direction transversely to the overflow direction, the outlet opening of the film cooling hole comprises a leading edge and a trailing edge in the overflow direction and the diffuser widens in the plane of the outlet opening starting from the leading edge, so that the diffuser is shaped trapezoidally in the plane of the outer surface.