EP 0285778 B1 19900822 - METHOD FOR PRODUCTION OF A COMPOUND GAS TURBINE BLADE CONSISTING OF A FOOT, BLADE AND HEAD PIECE, WHEREBY THE BLADE IS MADE FROM A DISPERSION HARDENED NICKEL BASED SUPER-ALLOY; AND COMPOUND BLADE PRODUCED USING THIS METHOD
Title (en)
METHOD FOR PRODUCTION OF A COMPOUND GAS TURBINE BLADE CONSISTING OF A FOOT, BLADE AND HEAD PIECE, WHEREBY THE BLADE IS MADE FROM A DISPERSION HARDENED NICKEL BASED SUPER-ALLOY; AND COMPOUND BLADE PRODUCED USING THIS METHOD
Publication
Application
Priority
CH 105587 A 19870319
Abstract (en)
[origin: US4869645A] A composite gas turbine blade consists of an airfoil (1) in an oxide-dispersion-hardened nickel-based superalloy, in the condition of longitudinally directed coarse columnar crystals, and a shroud plate (6) or a shroud and a root (7), the latter items in a non-dispersion-hardened nickel-based superalloy (cast alloy). The gas turbine blade is manufactured by casting in and casting round, using the non-dispersion-hardened superalloy mentioned, the tip end (2) and root end (3)-provided with depressions (4) and/or protrusions (5)-of the airfoil (1), after preheating the latter to a temperature of between 50 DEG and 300 DEG C. below the solidus temperature of the lowest melting phase of the airfoil material. The casting temperature for this should be a maximum of 100 DEG C. above the liquidus temperature of the highest melting phase of this non-dispersion-hardened alloy. Any melting onto the airfoil (1) and any metallurgical connection is to be avoided. It is advantageous to provide a thermally insulating, mechanically damping intermediate layer (16) of an oxide of at least one of the elements Cr, Al, Si, Ti and Zr with a thickness of 5 to 200 mu m between the airfoil (1), on the one hand, and the shroud plate (6) and the root (7), on the other.
IPC 1-7
IPC 8 full level
F01D 5/28 (2006.01); B21D 53/78 (2006.01); B22D 19/00 (2006.01); C22C 19/05 (2006.01)
CPC (source: EP US)
B22D 19/00 (2013.01 - EP US); Y10T 29/49337 (2015.01 - EP US); Y10T 29/49988 (2015.01 - EP US)
Designated contracting state (EPC)
CH DE GB LI SE
DOCDB simple family (publication)
EP 0285778 A1 19881012; EP 0285778 B1 19900822; CH 670406 A5 19890615; DE 3860472 D1 19900927; JP S63252663 A 19881019; US 4869645 A 19890926
DOCDB simple family (application)
EP 88102415 A 19880219; CH 105587 A 19870319; DE 3860472 T 19880219; JP 6377688 A 19880318; US 16701588 A 19880311