초록 ▼

This invention relates to a high temperature melting composition and a method of using the composition for brazing high temperature niobium-based substrates, such as niobium-based refractory metal-intermetallic compositions (RMIC), including but not restricted to niobium-silicide composite alloys. T

This invention relates to a high temperature melting composition and a method of using the composition for brazing high temperature niobium-based substrates, such as niobium-based refractory metal-intermetallic compositions (RMIC), including but not restricted to niobium-silicide composite alloys. The high temperature melting composition can include one or more alloys. The alloys include a base element selected from titanium, tantalum, niobium, hafnium, silicon, and germanium. The alloys also include at least one secondary element that is different from the base element. The secondary element can be selected from chromium, aluminum, niobium, boron, silicon, germanium and mixtures thereof. When two or more alloys are included in the composition, it is preferable, but not required, to select at least one lower melting alloy and at least one higher melting alloy. The composition is preferably a homogeneous mixture of the two or more alloys combined in powder form.

대표청구항 ▼

This invention relates to a high temperature melting composition and a method of using the composition for brazing high temperature niobium-based substrates, such as niobium-based refractory metal-intermetallic compositions (RMIC), including but not restricted to niobium-silicide composite alloys. T

This invention relates to a high temperature melting composition and a method of using the composition for brazing high temperature niobium-based substrates, such as niobium-based refractory metal-intermetallic compositions (RMIC), including but not restricted to niobium-silicide composite alloys. The high temperature melting composition can include one or more alloys. The alloys include a base element selected from titanium, tantalum, niobium, hafnium, silicon, and germanium. The alloys also include at least one secondary element that is different from the base element. The secondary element can be selected from chromium, aluminum, niobium, boron, silicon, germanium and mixtures thereof. When two or more alloys are included in the composition, it is preferable, but not required, to select at least one lower melting alloy and at least one higher melting alloy. The composition is preferably a homogeneous mixture of the two or more alloys combined in powder form. ue is not less than 12% and an S value is not more than 25%, where the F value is defined by the following equation (1) and the S value is defined by the following equation (2): F=-34.3C+0.48Si-0.012Mn--1.4Ni+Cr+2.48Al, (1) and S=Ni+Cr+Al, (2) and wherein the Fe--Cr--Ni--Al alloy has, as a result of an annealing heat treatment at 600 to 1050° C., a Vickers hardness of 250 to 410 NV, a mean coefficient of thermal expansion of 11×10-6to 14×10-6/° C. from 20 to 800° C., and a metal structure in which precipitates of a Ni--Al intermetallic compound are dispersed and a 0.2% yield strength of 550 to 1,000 MPa by a tensile test at room temperature. 4. A ferritic Fe--Cr--Ni--Al alloy having excellent oxidation resistance and high strength, which consists essentially of, by mass, 0.003 to 0.06% C, 0.03 to 1.0% Si, not more than 2.0% Mn, from not less than 2.57% to less than 5.0% Ni, 10.0 to 17.0% Cr, from 1.5% to less than 4.0% Al, 0.05 to 0.8% Zr, 0.05 to 1.0% in total of one or more elements selected from the group consisting of Hf, V, Nb and Ta, and the balance of Fe and incidental impurities, wherein an F value is not less than 12% and an S value is not more than 25%, where the F value is defined by the following equation (1) and the S value is defined by the following equation (2): F=-34.3C+0.48Si-0.012Mn--1.4Ni+Cr+2.48Al, (1) and S=Ni+Cr+Al, (2) and wherein the Fe--Cr--Ni--Al has, as a result of an annealing heat treatment at 600 to 1050° C., a Vickers hardness of 250 to 410 HV, a mean coefficient of thermal expansion of 11×10-6to 14×10-6/° C. from 20 to 800° C., and a metal structure in which precipitates of a Ni--Al intermetallic compound are dispersed and a 0.2% yield strength of 550 to 1,000 MPa by a tensile test at room temperature. 5. A ferritic Fe--Cr--Ni--Al alloy having excellent oxidation resistance and high strength, which consists essentially of, by mass, 0.003 to 0.08% C, 0.03 to 2.0% Si, not more than 2.0% Mn, from not less than 2.57% to not more than 8.0% Ni, from not less than 10.0% to less than 19.0% Cr, 1.5% to 8.0% Al, 0.05 to 1.0% Zr, 0.05 to 1.0% in total of at least one element selected from the group consisting of Y and REM, and the balance of Fe and incidental impurities, wherein an F value is not less than 12% and an S value is not more than 25%, where the F value is defined by the following equation (1) and the S value is defined by the following equation (2): F=-34.3C+0.48Si-0.012Mn-1.4Ni+Cr+2.48Al, (1) and S=Ni+Cr+Al, (2) and wherein the Fe--Cr--Ni--Al alloy has, as a result of an annealing heat treatment at 600 to 1050° C., a Vickers hardness of 250 to 410 HV, a mean coefficient of thermal expansion of 11×10-6to 14×10-6/° C. from 20 to 800° C., and a metal structure in which precipitates of a Ni--Al intermetallic compound are dispersed and a 0.2% yield strength of 550 to 1,000 MPa by a tensile test at room temperature. 6. A ferritic Fe--Cr--Ni--Al alloy having excellent oxidation resistance and high strength, which consists essentially of, by mass, 0.003 to 0.06% C, 0.03 to 1.0% Si, not more than 2.0% Mn, from not less than 2.57% to less than 5.0% Ni, 10.0 to 17.0% Cr, from not less than 1.5% to less than 4.0% Al, 0.05 to 0.8% Zr, 0.05 to 1.0% in total of at least one element selected from the group consisting of Y and REM, and the balance of Fe and incidental impurities, wherein an F value is not less than 12% and an S value is not more than 25%, where the F value is defined by the following equation (1) and the S value is defined by the following equation (2): F=-34.3C+0.48Si-0.012Mn-1.4Ni+Cr+2.48Al, (1) and S=Ni+Cr+Al, (2) and wherein the Fe--Cr--Ni--Al alloy has, as a result of an annealing heat treatment at 600 to 1050° C., a Vickers hardness of 250 to 410 HV, a mean coefficient of thermal expansion of 11×106to 14×10-6/° C. from 20 to 800° C., and a metal structure in which precipitates of a Ni--Al intermetallic compound are dispersed and a 0.2% yield strength of 550 to 1,000 MPa by a tensile test at room temperature. 7. A ferritic Fe--Cr--Ni--Al alloy having excellent oxidation resistance and high strength, which consists essentially of, by mass, 0.003 to 0.08% C, 0.03 to 2.0% Si, not more than 2.0% Mn, from not less than 2.57% to not more than 8.0% Ni, from not less than 10.0% to less than 19.0% Cr, 1.5 to 8.0% Al, 0.05 to 1.0% Zr, 0.05 to 1.0% in total of one or more elements selected from the group consisting of Hf, V, Nb and Ta, 0.05 to 1.0% in total of at least one element selected from the group consisting of Y and REM, and the balance of Fe and incidental impurities, wherein an F value is not less than 12% and an S value is not more than 25%, where the F value is defined by the following equation (1) and the S value is defined by the following equation (2): F=-34.3C+0.48Si-0.012Mn-1.4Ni+Cr+2.48Al, (1) and S=Ni+Cr+Al, (2) and wherein the Fe--Cr--Ni--Al alloy has, as a result of an annealing heat treatment at 600 to 1050° C., a Vickers hardness of 250 to 410 HV, a mean coefficient of thermal expansion of 11×10-6to 14×10-6/° C. from 20 to 800° C., and a metal structure in which precipitates of a Ni--Al intermetallic compound are dispersed and a 0.2% yield strength of 550 to 1,000 MPa by a tensile test at room temperature. 8. A ferritic Fe--Cr--Ni--Al alloy having excellent oxidation resistance and high strength, which consists essentially of, by mass, 0.003 to 0.06% C, 0.03 to 1.0% Si, not more than 2.0% Mn, from not less than 2.57% to less than 5.0% Ni, 10.0 to 17.0% Cr, from not less than 1.5% to less than 4.0% Al, 0.05 to 0.08% Zr, 0.05 to 1.0% in total of one or more elements selected from the group consisting of Hf, V, Nb and Ta, 0.05 to 1.0% in total of at least one element selected from the group consisting of Y and REM, and the balance of Fe and incidental impurities, wherein an F value is not less than 12% and an S value is not more than 25%, where the F value is defined by the following equation (1) and the S value is defined by the following equation (2): F=-34.3C+0.48Si-0.012Mn-1.4Ni+Cr+2.48Al, (1) and S=Ni+Cr+Al, (2) and wherein the Fe--Cr--Ni--Al alloy has, as a result of an annealing heat treatment at 600 to 1050° C., a Vickers hardness of 250 to 410 HV, a mean coefficient of thermal expansion of 11×10-6to 14×10-6/° C. from 20 to 800° C., and a metal structure in which precipitates of a Ni--Al intermetallic compound are dispersed and a 0.2% yield strength of 550 to 1,000 MPa by a tensile test at room temperature. 9. An alloy plate made of the ferritic Fe--Cr--Ni--Al alloy as defined in claim 1. 10. An alloy plate for a substrate made of the ferritic Fe--Cr--Ni--Al alloy as defined in claim 1. 11. An alloy plate made of the ferritic Fe--Cr--Ni--Al alloy as defined in claim 2. 12. An alloy plate made of the ferritic Fe--Cr--Ni--Al alloy as defined in claim 3. 13. An alloy plate made of the ferritic Fe--Cr--Ni--Al alloy as defined in claim 4. 14. An alloy plate made of the ferritic Fe--Cr--Ni--Al alloy as defined in claim 5. 15. An alloy plate made of the ferritic Fe--Cr--Ni--Al alloy as defined in claim 6. 16. An alloy plate made of the ferritic Fe--Cr--Ni--Al alloy as defined in claim 7. 17. An alloy plate made of the ferritic Fe--Cr--Ni--Al alloy as defined in claim 8. 18. An alloy plate for a substrate made of the ferritic Fe--Cr--Ni--Al alloy as defined in claim 2. 19. An alloy plate for a substrate made of the ferritic Fe--Cr--Ni--Al alloy as defined in claim 3. 20. An alloy plate for a substrate made of the ferritic Fe--Cr--Ni--Al alloy as defined in claim 4. 21. An alloy plate for a substrate made of the ferritic Fe--Cr--Ni--Al alloy as defined in claim 5. 22. An alloy plate for a substrate made of the ferritic Fe--Cr--Ni--Al alloy as defined in claim 6.