Thermally high-stressed cooled component, particularly a blade for turbine engines

Claim 2

Thermally highly stressed, cooled component in form of an integral single-piece element, such as a turbine engine blade, comprising a centrally arranged supporting core of a solid material; plurality of short radially projecting ridges extending from said core; an outer shroud carried by said ridges concentrically enveloping the supporting core, said shroud being made of a foamed through-porous material, and said supporting core, ridges, and outer shroud comprised of ceramic material cast in a single piece.

Claim 3

A thermally, highly stressed turbine blade as defined in claim 1 comprising; a root member having a central bore; and an air foil connected to said root member, said air foil having an outer shroud of through - porous material; the ridges on rib means carrying said porous outer shroud; said rib means extending radially from said central supporting core; cooling passages between portions of said rib means on said central core and extending tangentially to said support core for uniform distribution over substantially the entire inner surface of said outer shroud, said passages conducting cooling medium entering through said central bore in said root member; said cooling medium permeating from said passages through the pores of said outer shroud up to the surface of said air foil to form a cooling boundary layer, said blade, root member and air foil comprising an integral single-piece casting, said ceramic material comprising substantially aluminium oxide, said rib means being molded to the inner surface of said outer shroud.