High temperature metal alloy mixtures for filling holes and repairing damages in superalloy bodies
First Claim
1. A silicon-free metal powder mixture suitable for filling holes, slots and widegap joints in high temperature superalloy bodies and for reconstructing damages, missing or worn surface extensions thereof, such as blade tips, and capable of being processed at a temperature of between about 2000°
- F. and 2100°
F., which comprises (i) a major amount by weight of a first, lower melting, nickel-base superalloy powder composition consisting essentially of from about 14 to 16 weight percent chromium, from about 2.5 to 3.2 weight percent boron and the balance nickel, said lower melting composition having a liquidus, above about 1800°
F. and below about 2000°
F., (ii) a minor amount by weight of a second, higher melting, nickel-base superalloy powder composition containing from about 38 to 67 weight percent nickel, from about 11 to 15 weight percent chromium, from about 8 to 12 weight percent cobalt, from 3 to 10 weight percent tungsten, from 3.5 to 10 weight percent tantalum, amounts less than about 5.0 weight percent each of titanium, aluminum, molybdenum and hafnium, amounts less than about 0.5 weight percent each of carbon and zirconium, and from about 0.005 to 0.025 weight percent boron, said higher melting composition having a liquidus above about 2200°
F. but below about 2300°
F.; and
(iii) an optional minor amount by weight, less than the amount of said higher melting composition (ii), of nickel powder, said metal powder mixture being useful at a processing temperature between about 2000°
F. and 2100°
F., at which processing temperature the lower melting powder melts and alloys with the higher melting powder, and with the nickel powder, if present, to form a semi-solid, high viscosity, high surface-tension, form-retaining composition whereby said processed composition forms a sound, non-porous deposit which fills and bridges holes, slots and widegap joints and/or retains substantially the same shape on a superalloy body being repaired before and after processing.
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Accused Products
Abstract
A silicon-free metal powder mixture suitable for filling holes, slots and widegap joints in high temperature superalloys and/or for reforming damaged or missing surface extensions thereof, and capable of being processed at a temperature of about 2000° F. The semi-solid metal mixture has a sufficiently high surface tension and viscosity to be essentially non-flowing at the processing temperature so that it retains its applied shape and location without flowing during processing. The metal mixture after processing has a solidus temperature of at least 1950° F.
37 Citations
14 Claims
-
1. A silicon-free metal powder mixture suitable for filling holes, slots and widegap joints in high temperature superalloy bodies and for reconstructing damages, missing or worn surface extensions thereof, such as blade tips, and capable of being processed at a temperature of between about 2000°
- F. and 2100°
F., which comprises (i) a major amount by weight of a first, lower melting, nickel-base superalloy powder composition consisting essentially of from about 14 to 16 weight percent chromium, from about 2.5 to 3.2 weight percent boron and the balance nickel, said lower melting composition having a liquidus, above about 1800°
F. and below about 2000°
F., (ii) a minor amount by weight of a second, higher melting, nickel-base superalloy powder composition containing from about 38 to 67 weight percent nickel, from about 11 to 15 weight percent chromium, from about 8 to 12 weight percent cobalt, from 3 to 10 weight percent tungsten, from 3.5 to 10 weight percent tantalum, amounts less than about 5.0 weight percent each of titanium, aluminum, molybdenum and hafnium, amounts less than about 0.5 weight percent each of carbon and zirconium, and from about 0.005 to 0.025 weight percent boron, said higher melting composition having a liquidus above about 2200°
F. but below about 2300°
F.; and
(iii) an optional minor amount by weight, less than the amount of said higher melting composition (ii), of nickel powder, said metal powder mixture being useful at a processing temperature between about 2000°
F. and 2100°
F., at which processing temperature the lower melting powder melts and alloys with the higher melting powder, and with the nickel powder, if present, to form a semi-solid, high viscosity, high surface-tension, form-retaining composition whereby said processed composition forms a sound, non-porous deposit which fills and bridges holes, slots and widegap joints and/or retains substantially the same shape on a superalloy body being repaired before and after processing. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
- F. and 2100°
Specification