Loading patent…
AssigneeAsea Brown Boveri AG
InventorsPeter Ernst, Manfred Thumann, Christoph Tonnes
Estimating the term…
A turbine blade including a blade foot and a blade. The blade foot is formed by a ductile material and the blade comprises a material which is brittle compared to the ductile material but resistant to high temperature. The two materials are alloys of different chemical compositions and are hot-compacted with the formation of a boundary layer joining the blade foot and blade to produce a bimetallic composite material. The blade foot predominantly comprises a titanium-base alloy and the blade comprises a gamma-titanium aluminide containing 0.5 to 8 atomic percent of a dopant. The turbine blade exhibits outstanding mechanical properties at high temperatures, good ductility at room temperature and a long service life.
A turbine blade, which can be exposed to high temperatures, comprising a blade root formed from a first material which is ductile and a blade formed from a second material which is brittle compared with the first material, the first and second materials comprising first and second alloys of different chemical compositions which have been hot-compacted with the formation of a boundary layer joining the blade root and the blade to produce a bimetallic material, the first alloy forming the blade root being a titanium-based alloy and the second alloy forming the blade being a gamma titanium aluminide containing a proportion of at least 0.5 and at most 8 atomic percent of dopant, and the boundary layer being essentially formed by a binary titanium aluminum alloy ensuring reliable operation of the turbine blade at high temperature.
Dependencies are inferred from the claim text.