IPC분류정보
| 국가/구분 |
United States(US) Patent
등록
|
| 국제특허분류(IPC7판) |
|
| 출원번호 |
US-0140062
(2002-05-08)
|
| 우선권정보 |
EP-0111652 (2001-05-14) |
|
발명자
/ 주소 |
- Schnell, Alexander
- Fernihough, John
- Konter, Maxim
|
| 출원인 / 주소 |
- Alstom (Switzerland) Ltd.
|
| 대리인 / 주소 |
|
| 인용정보 |
피인용 횟수 :
12 인용 특허 :
21 |
초록
▼
A process of brazing cracks and gaps in a single crystal article which takes places isothermally under the following conditions: the temperature of the isothermal solidification is between TLiqidus,Braze +5*(wt-%BBraze) and (Tsolidus,base material -70*(wt-%BBraze)), while (wt-%B*wt-%Cr) is between 1
A process of brazing cracks and gaps in a single crystal article which takes places isothermally under the following conditions: the temperature of the isothermal solidification is between TLiqidus,Braze +5*(wt-%BBraze) and (Tsolidus,base material -70*(wt-%BBraze)), while (wt-%B*wt-%Cr) is between 15 and 40 and (Tsolv.γ', base material -TLiqidus,Braze) is above 140° C. This results in an homogeneous γ/γ'-microstructure of the isothermal solidified, brazed joint with mechanical properties similar to those of the base material.
대표청구항
▼
1. A method of joining or repairing cracks or gaps in a single crystal article made of a Nickel based superalloy with a brazing alloy comprising at least γ'-phase forming elements and at least boron as melting point depressant, comprising: isothermal, epitaxial single crystal solidification of th
1. A method of joining or repairing cracks or gaps in a single crystal article made of a Nickel based superalloy with a brazing alloy comprising at least γ'-phase forming elements and at least boron as melting point depressant, comprising: isothermal, epitaxial single crystal solidification of the brazing alloy, wherein the Temperature of the isothermal solidification is between TLiqidus,Braze +5*(wt-%BBraze) and (Tsolidus,base material -70*(wt-%BBraze)), while (wt-%BBraze*wt-%CrBraze) is between 15 and 40 and (Tsolv.γ', base material -TLiqidus,Braze) is above 140° C. 2. The method according to claim 1, wherein the base material consists of (wt-%) 6.3-6.6 Cr, 9.3-10 Co, 0.5-0.7 Mo, 6.2-6.6 W, 6.3-6.7 Ta, 2.8-3.1 Re, 5.45-5.75 Al, 0.9-1.1 Ti, 0.17-0.23 Hf, 200-260 ppm C, 50-80 ppm B, balance Ni and unavoidable impurities. 3. The method according to claim 1, wherein the braze material is Ni based and contains (wt-%) 8-15 Cr and (wt-%) 1-3 B. 4. The method according to claim 1, wherein the isothermal solidification comprises heat treatment at a temperature of 1120° C.-1160° C. for 8 to 20 h. 5. The method according to claim 4, wherein the heat treatment of the isothermal solidification takes place at a temperature of 1140° C. 6. The method according to claim 4, wherein after the heat treatment there is a heat treatment of 1180° C. for 30 mm. 7. The method according to claim 4, wherein before the heat treatment there is a heat treatment of 1180° C. to 1200° C. for 20 to 30 mm followed by a cooling of 1° C.-2° C./min. 8. The method according to claim 4, wherein after the heat treatment the temperature is lowered at a rate of 1° C.-2° C./min to a temperature between 800° C.-900° C. and the temperature is held for 1 to 6 hours. 9. The method according to claim 1, further comprising brazing the crack or gap with a maximum width of 300 μm. 10. The method according to claim 1, further comprising: applying a braze slurry into and over the crack or gaps and applying a mixture of brazing alloy and filler material on top of the braze slurry, before the heat treatment of the brazing. 11. The method according to claim 1, further comprising: removing a protective coating before the isothermal solidification: and applying a protective coating after the isothermal solidification. 12. The method according to claim 1, further comprising cleaning the surface of the crack or gap from oxides before the isothermal solidification. 13. The method according to claim 1, further comprising: Flour-Ion-Cleaning the surface before the isothermal solidification. 14. The method according to claim 5, wherein after the heat treatment there is a heat treatment of 1180° C. for 30 mm. 15. The method according to claim 5, wherein before the heat treatment there is a heat treatment of 1180° C. to 1200° C. for 20 to 30 mm followed by a cooling of 1° C.-2° C./min.
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