Metal fusion bonding – Process – Repairing – restoring – or renewing product for reuse
Patent
1982-10-05
1985-01-15
Ramsey, Kenneth J.
Metal fusion bonding
Process
Repairing, restoring, or renewing product for reuse
228238, 2940218, B23P 604
Patent
active
044934513
ABSTRACT:
Superalloy components which have defects such as pits, machining errors or any other `lack of metal` condition can be repaired using a braze stabilized sinter process. The invention includes filling the defect with a mixture of base super-alloy powder mixed with a low temperature braze alloy. A higher temperature alloy is overlayed and the component subjected to a vacuum furnace cycle that includes a dwell between the melting points of the two braze alloys. This dwell allows the lower temperature alloy to melt and isothermally solidify by the process of diffusion. This effectively `stabilizes` the sinter which is porous. On further heating, the higher temperature braze alloy melts and flows into the interstices of the sinter, forming a pore-free solid mass. The higher temperature braze alloy can also be diffused by holding at elevated temperatures. This increases the remelt temperature of the repair should further thermal cycling be required.
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Clark Stephen D.
Fell Peter J.
Wood Philip S.
Jordan M.
Ramsey Kenneth J.
Rolls-Royce Limited
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