Metal fusion bonding – Process – Diffusion type
Patent
1988-05-11
1989-04-04
Godici, Nicholas P.
Metal fusion bonding
Process
Diffusion type
228203, 228236, 228239, 22826313, 291568B, 291568H, 148 115N, 148 131, 416223R, 416232, 416233, 419 28, 419 29, 419 54, 419 55, B23K 2002, B21K 304
Patent
active
048178586
ABSTRACT:
Method of manufacturing a workpiece of any given cross-sectional dimensions from an oxide-dispersion-hardened nickel-based superalloy available in the form of coarse-grained longitudinally directed columnar crystals by connecting previously very finely machined workpiece parts derived from a semi-finished product by diffusion-bonding using hot isostatic pressing, the workpiece parts being first heat-treated under a protective gas in the temperature range of 50.degree. to 100.degree. C. below the recrystallization temperature, under a pressure p.sub.k of not more than 5 MPa with the machined surfaces to be connected joined together, the workpiece then being heated at least to a critical temperature T.sub.K, above which no further cold working takes place, and the pressure then being gradually increased to the diffusion bonding pressure p.sub.max of 100 to 300 MPa with simultaneous increase in temperature are a heating rate of not more of 2.degree. C./min to the diffusion bonding temperature T.sub.D of 0 to 50.degree. C. below the recrystallization temperature, this condition being maintained for 1 to 24 hours. Safe variant: only raise the pressure when T.sub.D has been reached!Application: gas turbine blading of large dimensions.
REFERENCES:
patent: 3758741 (1973-09-01), Holko et al.
patent: 4706361 (1987-11-01), Meyer et al.
BBC Brown Boveri AG
Godici Nicholas P.
Heinrich Samuel M.
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