Nickel-base braze material and method of filling holes therewith
A nickel-base braze material suitable for closing holes in a high temperature component, such as a tip cap hole in a turbine blade. The braze material comprises first and second filler materials and a binder. The first filler material comprises particles of a first alloy, and the second filler material comprises particles of at least a second alloy having a lower melting temperature than the first alloy. The second alloy consists essentially of, by weight, about 8 to about 23 percent chromium, about 4 to about 18 percent cobalt, about 1.5 to about 6.0 percent tantalum, about 1.0 to about 6.0 percent aluminum, about 0.3 to about 1.5 percent boron, about 2.0 to about 6.0 percent silicon, up to 0.2 percent carbon, the balance being nickel and incidental impurities.
1. A nickel-base braze material comprising first and second filler materials in at least one binder, the first filler material consisting of particles of a first alloy, the second filler material consisting of particles of a second alloy and optionally particles of a third alloy wherein the second alloy and the third alloy have lower melting temperatures than the first alloy, the second alloy consisting of, by weight, about 8 to about 23 percent chromium, about 4 to about 18 percent cobalt, about 1.5 to about 6.0 percent tantalum, about 1.0 to about 6.0 percent aluminum, about 0.3 to about 1.5 percent boron, about 2.0 to about 6.0 percent silicon, up to 0.2 percent carbon, the balance being nickel and incidental impurities.
2. The nickel-base braze material according to claim 1 , wherein the second alloy consists of, by weight, about 14.8 to about 15.8 percent chromium, about 9.5 to about 11 percent cobalt, about 3.0 to about 3.8 percent tantalum, about 3.2 to about 3.7 percent aluminum, about 0.8 to about 1.2 percent boron, about 3.5 to about 4.1 percent silicon, up to 0.05 percent carbon, the balance being nickel and incidental impurities.
3. The nickel-base braze material according to claim 1 , wherein the first and second filler materials are mixed together in the at least one binder at a weight ratio of about 60:40 to about 30:70, the second filler material consists of the particles of the second alloy, and the first alloy consists of, by weight, about 7.4 to about 7.8 percent chromium, about 5.3 to about 5.6 percent tantalum, about 2.9 to about 3.3 percent cobalt, about 7.6 to about 8.0 percent aluminum, about 0.12 to about 0.18 percent hafnium, about 0.5 to about 0.6 percent silicon, about 3.7 to about 4.0 percent tungsten, about 1.5 to about 1.8 percent rhenium, about 0.01 to about 0.03 percent carbon, about 0.01 to about 0.02 percent boron, balance nickel and incidental impurities.
4. The nickel-base braze material according to claim 3 , wherein the first and second filler materials are mixed together at a weight ratio of about 45:55.
5. The nickel-base braze material according to claim 1 , wherein the first and second filler materials are mixed together in the at least one binder at a weight ratio of about 55:45 to about 25:75, the second filler material consists of the particles of the second alloy. and the first alloy consists of, by weight, about 0.15 to about 0.19 percent carbon, about 13.7 to about 14.3 percent chromium, about 9.0 to about 10.0 percent cobalt, about 4.8 to about 5.2 percent titanium, about 2.8 to about 3.2 percent aluminum, about 3.7 to about 4.3 percent tungsten, about 3.7 to about 4.3 percent molybdenum (7.7 percent minimum tungsten+molybdenum), the balance nickel and incidental impurities.
6. The nickel-base braze material according to claim 5 , wherein the first and second filler materials are mixed together at a weight ratio of about 40:60.
7. The nickel-base braze material according to claim 1 , wherein the first and second filler materials are mixed together in the at least one binder at a weight ratio of about 60:40 to about 30:70, the first alloy consists of, by weight, about 0.15 to about 0.19 percent carbon, about 13.7 to about 14.3 percent chromium, about 9.0 to about 10.0 percent cobalt, about 4.8 to about 5.2 percent titanium, about 2.8 to about 3.2 percent aluminum, about 3.7 to about 4.3 percent tungsten, about 3.7 to about 4.3 percent molybdenum (7.7 percent minimum tungsten+molybdenum), the balance nickel and incidental impurities, the second filler material consists of the particles of the second and third alloys at a weight ratio of about 3:1 to about 1:2, and the third alloy consists of, by weight, about 18.5 to about 19.5 percent chromium, up to 0.01 percent carbon, up to about 0.03 percent boron, about 9.8 to about 10.3 percent silicon, the balance being nickel and incidental impurities.
8. The nickel-base braze material according to claim 7 , wherein the first, second, and third alloys are combined in the braze material at a weight ratio of about 45:27.5:27.5.
9. The nickel-base braze material according to claim 7 , wherein the second and third alloys are combined in the second filler material at a weight ratio of about 1:1.
10. The nickel-base braze material according to claim 7 , wherein the first and second filler materials are mixed together at a weight ratio of about 45:55.
11. The nickel-base braze material according to claim 1 , wherein the first and second filler materials are mixed together in the at least one binder at a weight ratio of about 60:40 to about 30:70, the first alloy consists of, by weight, about 11.45 to about 12.05 percent cobalt, 6.6 to about 7.0 percent chromium, 5.94 to about 6.3 percent aluminum, 1.3 to about 1.7 percent molybdenum, 4.7 to about 5.0 percent tungsten, 6.2 to about 6.5 percent tantalum, 2.6 to about 3.0 percent rhenium, 1.3 to about 1.7 percent hafnium, 0.10 to about 0.14 percent carbon, up to 0.02 percent titanium, the balance nickel and incidental impurities, the second filler material consists of the particles of the second and third alloys at a weight ratio of about 4:1 to about 1:1, and the third alloy consists of, by weight, about 14.8 to about 15.8 percent chromium, about 9.5 to about 11 percent cobalt, about 3.0 to about 3.8 percent tantalum, about 3.2 to about 3.7 percent aluminum, about 2.1 to about 2.5 percent boron, up to 0.05 percent carbon, the balance being nickel and incidental impurities.
12. The nickel-base braze material according to claim 11 , wherein the first, second, and third alloys are combined in the braze material at a weight ratio of about 45:36.7:18.3.
13. The nickel-base braze material according to claim 11 , wherein the second and third alloys are combined in the second filler material at a weight ratio of about 2:1.
14. The nickel-base braze material according to claim 11 , wherein the first and second filler materials are mixed together at a weight ratio of about 45:55.
15. The nickel-base braze material according to claim 1 , wherein the first and second filler materials are not mixed together but contact each other, the first and second filler materials are present in the braze material at a weight ratio of about 55:45 to about 15:85, the first alloy consists of, by weight, about 11.45 to about 12.05 percent cobalt, 6.6 to about 7.0 percent chromium, 5.94 to about 6.3 percent aluminum, 1.3 to about 1.7 percent molybdenum, 4.7 to about 5.0 percent tungsten, 6.2 to about 6.5 percent tantalum, 2.6 to about 3.0 percent rhenium, 1.3 to about 1.7 percent hafnium, 0.10 to about 0.14 percent carbon, up to 0.02 percent titanium, the balance nickel and incidental impurities, the second filler material consists of the particles of the second and third alloys at a weight ratio of about 4:1 to about 1:1, and the third alloy consists of, by weight, about 14.8 to about 15.8 percent chromium, about 9.5 to about 11 percent cobalt, about 3.0 to about 3.8 percent tantalum, about 3.2 to about 3.7 percent aluminum, about 2.1 to about 2.5 percent boron, up to 0.05 percent carbon, the balance being nickel and incidental impurities.
16. The nickel-base braze material according to claim 15 , wherein the first, second, and third alloys are combined in the braze material at a weight ratio of about 40:40:20.
17. The nickel-base braze material according to claim 15 , wherein the second and third alloys are combined in the second filler material at a weight ratio of about 2:1.
18. The nickel-base braze material according to claim 15 , wherein the first and second filler materials are present in the braze material at a weight ratio of about 40:60.
19. The nickel-base braze material according to claim 15 , wherein the first filler material fills a tip cap hole in a turbine blade and the second filler material overlies the first filler material and a surface region of the turbine blade surrounding the tip cap hole.
20. The nickel-base braze material according to claim 1 , wherein the braze material fills a tip cap hole in a turbine blade.