IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0241347
(1988-09-09)
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발명자
/ 주소 |
- Lee Jack W. (Brookfield CT) Miller Jule A. (Derby CT) Iovene Michael A. (Woodbridge CT)
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출원인 / 주소 |
- Avco Corporation (Providence RI 02)
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인용정보 |
피인용 횟수 :
17 인용 특허 :
9 |
초록
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A method of repairing damages in a superalloy component is disclosed wherein existing brazed joints and protective coatings are not harmed. The method entails the use of a silicon-free metal mixture comprising (i) a low melting alloy having a liquidus below the temperature to be used to deposit the
A method of repairing damages in a superalloy component is disclosed wherein existing brazed joints and protective coatings are not harmed. The method entails the use of a silicon-free metal mixture comprising (i) a low melting alloy having a liquidus below the temperature to be used to deposit the metal mixture, (ii) an alloy melting above about 2100°F., and (iii) optionally nickel. The resultant repair has a solidus temperature of at least 1950°F., preferably at least 2000°.
대표청구항
▼
.A method for repairing damaged superalloy bodies which comprises (a) applying directly into holes or slots or widegap joint damages on such bodies or reconstructing damaged, missing or worn surface extensions of such bodies, such as blade tips, a semi-solid, form-retaining, substantially silicon-fr
.A method for repairing damaged superalloy bodies which comprises (a) applying directly into holes or slots or widegap joint damages on such bodies or reconstructing damaged, missing or worn surface extensions of such bodies, such as blade tips, a semi-solid, form-retaining, substantially silicon-free metal alloy powder mixture capable of being processed at a temperature of between about 2000°F. and 2100°F., said metal alloy mixture comprising (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 tatanlum, 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 0.0005 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, (b) heating said applied metal alloy powder mixture to a processing temperature between about 2000°F. and 2100°F. for a sufficient time to cause the lower melting powder (i) to melt and alloy with the higher melting powder (ii), and with the nickel powder (iii), if present, for forming a semi-solid high viscosity, high surface-tension, form-retaining composition having a solidus temperature of at least about 1950°F., and (c) cooling said processed composition to form a sound, non-porous deposit which fills and bridges the holes, slots and widegap joints and retains substantially the same shape on a superalloy body being repaired before and after processing.
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