CN115194275B - Method for brazing dissimilar metals of titanium alloy and nickel-based superalloy - Google Patents
Method for brazing dissimilar metals of titanium alloy and nickel-based superalloy Download PDFInfo
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- CN115194275B CN115194275B CN202210620579.6A CN202210620579A CN115194275B CN 115194275 B CN115194275 B CN 115194275B CN 202210620579 A CN202210620579 A CN 202210620579A CN 115194275 B CN115194275 B CN 115194275B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K1/00—Soldering, e.g. brazing, or unsoldering
- B23K1/0008—Soldering, e.g. brazing, or unsoldering specially adapted for particular articles or work
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K1/00—Soldering, e.g. brazing, or unsoldering
- B23K1/008—Soldering within a furnace
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K1/00—Soldering, e.g. brazing, or unsoldering
- B23K1/20—Preliminary treatment of work or areas to be soldered, e.g. in respect of a galvanic coating
- B23K1/206—Cleaning
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K2103/00—Materials to be soldered, welded or cut
- B23K2103/18—Dissimilar materials
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Abstract
A method for brazing dissimilar metals of titanium alloy and nickel-based superalloy relates to a method for brazing dissimilar metals. The invention aims to solve the technical problems that the current braze welding joint of Ti alloy and Ni-based superalloy has large brittleness and severe reaction, and the Ti element and the element in the Ni-based superalloy are extremely easy to react to generate a brittle intermetallic compound continuous layer, so that the joint performance is weakened. The invention successfully realizes the brazing of the Ti alloy and the Ni-based superalloy by a two-step method, and the added Nb soft interlayer plays a double role: firstly, the contact of Ti with Ni, cr, au and other elements is successfully blocked, and the problem that brittle intermetallic compounds in a braze joint of Ti alloy and Ni-based superalloy are difficult to inhibit is solved; the second, nb soft intermediate layer successfully alleviates the problem of mismatch in the coefficients of thermal expansion of the Ti alloy and the Ni-based superalloy.
Description
Technical Field
The invention relates to a dissimilar metal brazing method.
Background
With the rapid development of the aeronautical industry, the development of the aeronautical industry is driven by the progress of the design, materials and manufacturing technology of the aeronautical engine. In order to improve the thrust-weight ratio of the aeroengine, the engine quality is reduced through structural design on the premise of ensuring that the engine performance is not reduced or even improved, and the light-weight strategy is effective. Titanium and titanium alloys have been widely used in various fields due to their excellent properties such as low density, high specific strength, corrosion resistance, and high temperature resistance, and have been particularly used as structural materials, heat-resistant materials, and corrosion-resistant materials in the fields of aviation, aerospace, and the like. Ni-based superalloys have been widely used in hot end components of aeroengines or industrial gas turbines, such as diffusers and vectoring nozzles for advanced gas turbine engines, due to their excellent high strength and high temperature environmental corrosion resistance. In fact, in order to realize the low-density Ti alloy to partially replace Ni-based superalloy, the high-temperature service and the remarkable weight reduction effect are realized, and the connection problem of the high-temperature service and the remarkable weight reduction effect is necessarily involved. The chemical components of the Ti alloy and the Ni-based superalloy are greatly different, a Ti-Ni brittle intermetallic compound is extremely easy to form, and the two have the difference of thermal expansion coefficients, so that cracks are easy to induce in a connecting area. In addition, it is difficult for commercial Ni-based and Ti-based solders to have compatibility with both base metals at the same time, and it is very difficult to achieve good bonding of both. Therefore, the connection of Ti alloy and Ni-based superalloy dissimilar materials is a key technology that needs to be broken through.
Current research on titanium/nickel dissimilar material joining has focused on laser welding, solid-phase diffusion welding, electron beam welding, explosion welding, friction welding, brazing, and the like. The brazing method has wide application in the connection of dissimilar materials, can weld dissimilar materials with larger difference in performance, and can obtain a complex shape structure. The brazing filler metal is melted in the brazing process, and the base metal is not melted, so that the influence on the base metal is small, the joint surface is smooth, the air tightness is good, and the shape and the size are stable. Researchers have brazed Ti with TiZrCuNi solder 2 AlNb alloy and GH536 high-temperature alloy, due to AlNi 2 Ti、Al 3 NiTi 2 The formation of brittle intermetallic compounds, where cracks mainly initiate, brittle fracture of the entire joint occurs (Chen-yangJiang, et al microstructure evolution and mechanical properties of TiAl/GH536 joints vacuum brazed with Ti-Zr-Cu-Ni filter metals, internets, 2022,142,107468). Still other scholars braze TiAl/GH3030 with Ti-based amorphous solders, in joint shear testing, fracture interfaces occur at Ti (Al, cu, ni) and Ti (Al, cu, ni) due to stress concentrations 3 In the intermetallic layer, braze joint cracks propagate along the TiAl parent metal side transition zone/intermediate weld interface, exhibiting lamellar fracture and brittle fracture characteristics (Shuili, et al Vacus brazing TiAlintermetallics to GH3030alloy with a multi-component Ti-based filer metal. Journal of Manufacturing Processes,2021,70,484-493).
In summary, the problem of brazing Ti alloy and Ni-based superalloy is that the braze joint is brittle and reacts violently, and the Ti element and the element in Ni-based superalloy react extremely easily to generate a brittle intermetallic compound continuous layer, which is a weak link of the joint. In addition, the brazing temperature is lower than the phase transition point of the Ti alloy, so that the performance of the Ti alloy is prevented from weakening, and therefore, the development of a brazing method suitable for dissimilar materials of the Ti alloy and the Ni-based superalloy is beneficial to the application of the brazing method in engineering practice.
Disclosure of Invention
The invention aims to solve the technical problems that the joint performance is weakened due to the fact that the existing braze welding joint of Ti alloy and Ni-based superalloy is large in brittleness and severe in reaction, and the Ti element and the element in the Ni-based superalloy are extremely easy to react to generate a brittle intermetallic compound continuous layer, and provides a method for braze welding dissimilar metals of the Ti alloy and the Ni-based superalloy.
The method for brazing the dissimilar metals of the titanium alloy and the nickel-based superalloy is carried out according to the following steps:
1. pretreatment of base materials: putting the cut base metal nickel-based superalloy and the base metal titanium alloy into alcohol, cleaning to remove greasy dirt and impurities attached to the surfaces in the cutting process, sequentially polishing the surfaces to be welded of the two base metals step by using 600-mesh and 1200-mesh water sand paper to remove rough scratches and impurity layers on the surfaces, polishing the scratches by using metallographic sand paper, and finally polishing by using a diamond polishing agent with the granularity of 0.5 mu m to enable the surfaces to be welded to be bright; soaking two base metals, an AuNi eutectic solder, an AgCuTi solder and a soft interlayer Nb foil in alcohol for ultrasonic cleaning for 180-200 s to remove impurities on the surfaces, and drying by a blower for later use; the thickness of the soft interlayer Nb foil is 100-200 mu m;
2. first step of brazing: forming a sandwich structure by the cleaned base metal nickel-based superalloy, the AuNi eutectic solder and the soft middle layer Nb foil in the vertical direction, wherein the AuNi eutectic solder is positioned in the middle, organic binder is coated between each layer, a graphite briquetting is arranged on the sandwich structure, the whole is placed in a vacuum furnace, vacuumizing is carried out, then the temperature is raised to 300-320 ℃ and the temperature is kept for 20min, so that the organic binder added during assembly is completely volatilized; then heating to the brazing temperature of 950-1020 ℃ and preserving heat for 0-30 min, then cooling to 300-320 ℃, and then cooling to room temperature along with a furnace to obtain a semi-finished joint;
3. and a second step of brazing: assembling the Nb end of the semi-finished joint prepared in the second step with the AgCuTi brazing filler metal cleaned in the first step and the parent metal titanium alloy cleaned in the first step in sequence, coating an organic binder between each layer, vertically placing the whole, placing a graphite briquetting at the uppermost part, integrally placing the whole in a vacuum furnace, vacuumizing, heating to 300-320 ℃ and preserving heat for 20min to enable the organic binder added during assembling to be completely volatilized; then heating to brazing temperature of 820-875 ℃ and preserving heat for 0-20 min, then cooling to 300-320 ℃, and then cooling to room temperature along with a furnace to obtain the joint.
The nickel-based superalloy parent metal has high temperature resistance and high strength, and is commonly used for hot end components such as a case, an engine blade and the like of an aeroengine;
the titanium alloy base material has high temperature resistance, corrosion resistance and high specific strength, and can be used for parts of engines.
The invention starts from the service environment and the service performance of a structural member, in order to avoid intermetallic compounds generated by excessive reaction of Ti element and Ni element and relieve the thermal mismatch stress between dissimilar metals of titanium alloy and nickel-based superalloy, the invention further uses a two-step welding method added with a soft intermediate layer Nb, adopts AuNi eutectic solder for high-temperature brazing to connect the nickel-based superalloy and the Nb intermediate layer, adopts AgCuTi solder for connecting a first-step welding sample and a base metal at a temperature lower than the beta phase transition point of the titanium alloy, and the brazing temperature of the second-step brazing is lower than the phase transition temperature of the titanium alloy.
The invention successfully realizes the brazing of the Ti alloy and the Ni-based superalloy by a two-step method, and the added Nb soft interlayer plays a double role: firstly, the contact of Ti with Ni, cr, au and other elements is successfully blocked, and the problem that brittle intermetallic compounds in a braze joint of Ti alloy and Ni-based superalloy are difficult to inhibit is solved; the second, nb soft intermediate layer successfully alleviates the problem of mismatch in the coefficients of thermal expansion of the Ti alloy and the Ni-based superalloy.
The microstructure mainly comprising Ag base and AuNi solid solution is formed in the joint welding seam finally prepared by the invention, and the strength and the plasticity of the whole joint are obviously improved.
Drawings
Fig. 1 is a scanning electron micrograph of the braze joint finally obtained in test four, wherein 1 is nickel-base superalloy K4648,2 is titanium alloy TA15,3 is soft interlayer Nb,4 is AgCuTi braze, and 5 is AuNi eutectic braze.
Detailed Description
The first embodiment is as follows: the embodiment is a method for brazing dissimilar metals of a titanium alloy and a nickel-based superalloy, which specifically comprises the following steps:
1. pretreatment of base materials: putting the cut base metal nickel-based superalloy and the base metal titanium alloy into alcohol, cleaning to remove greasy dirt and impurities attached to the surfaces in the cutting process, sequentially polishing the surfaces to be welded of the two base metals step by using 600-mesh and 1200-mesh water sand paper to remove rough scratches and impurity layers on the surfaces, polishing the scratches by using metallographic sand paper, and finally polishing by using a diamond polishing agent with the granularity of 0.5 mu m to enable the surfaces to be welded to be bright; soaking two base metals, an AuNi eutectic solder, an AgCuTi solder and a soft interlayer Nb foil in alcohol for ultrasonic cleaning for 180-200 s to remove impurities on the surfaces, and drying by a blower for later use; the thickness of the soft interlayer Nb foil is 100-200 mu m;
2. first step of brazing: forming a sandwich structure by the cleaned base metal nickel-based superalloy, the AuNi eutectic solder and the soft interlayer Nb foil in the vertical direction, wherein the AuNi eutectic solder is positioned in the middle, organic binder is coated between each layer, the graphite briquette is arranged on the sandwich structure, the whole is placed in a vacuum furnace, and the vacuum degree is pumped to 6 multiplied by 10 -3 Pa, then heating to 300-320 ℃ and preserving heat for 20-25 min to enable the organic binder added during assembly to be completely volatilized; then heating to the brazing temperature of 950-1020 ℃ and preserving heat for 0-30 min, then cooling to 300-320 ℃, and then cooling to room temperature along with a furnace to obtain a semi-finished joint;
3. and a second step of brazing: assembling the Nb end of the semi-finished joint prepared in the second step with the AgCuTi brazing filler metal cleaned in the first step and the parent metal titanium alloy cleaned in the first step in sequence, coating an organic binder between each layer, vertically placing the whole, placing a graphite briquetting at the uppermost part, integrally placing the whole in a vacuum furnace, vacuumizing, heating to 300-320 ℃ and preserving heat for 20-25 min to enable the organic binder added during assembling to volatilize completely; then heating to brazing temperature of 820-875 ℃ and preserving heat for 0-20 min, then cooling to 300-320 ℃, and then cooling to room temperature along with a furnace to obtain the joint.
The second embodiment is as follows: the first difference between this embodiment and the specific embodiment is that: the base metal nickel-base superalloy in the first step is K4648. The other is the same as in the first embodiment.
And a third specific embodiment: this embodiment differs from the first or second embodiment in that: the base metal titanium alloy in the first step is TA15. The other embodiments are the same as those of the first or second embodiment.
The specific embodiment IV is as follows: this embodiment differs from one of the first to third embodiments in that: in the first step, two base materials, an AuNi eutectic solder, an AgCuTi solder and a soft interlayer Nb foil are soaked in alcohol for ultrasonic cleaning for 180 seconds to remove impurities on the surfaces, and the surfaces are dried by a blower for standby. The other is the same as in one of the first to third embodiments.
Fifth embodiment: the fourth difference between this embodiment and the third embodiment is that: the organic binder in the second step is 502 glue. The other is the same as in the fourth embodiment.
Specific embodiment six: the fourth difference between this embodiment and the third embodiment is that: and in the second step, the temperature is raised to 300 ℃ and kept for 20 minutes so that the organic binder added during assembly is completely volatilized. The other is the same as in the fourth embodiment.
Seventh embodiment: the sixth embodiment differs from the first embodiment in that: and in the second step, the temperature is raised to 980 ℃ for 5min, then the temperature is reduced to 300 ℃, and the temperature is cooled to room temperature along with a furnace, so that the semi-finished joint is obtained. The other is the same as in the sixth embodiment.
Eighth embodiment: the present embodiment is different from the seventh embodiment in that: the organic binder in the third step is 502 glue. The other is the same as in the seventh embodiment.
Detailed description nine: the present embodiment is different from the seventh embodiment in that: and in the third step, the temperature is raised to 300 ℃ and kept for 20 minutes so that the organic binder added during assembly is completely volatilized. The other is the same as in the seventh embodiment.
Detailed description ten: the present embodiment is different from the seventh embodiment in that: and thirdly, heating to the brazing temperature of 850 ℃ and preserving heat for 0min, cooling to 300 ℃, and cooling to room temperature along with a furnace to obtain the joint. The other is the same as in the seventh embodiment.
The invention was verified with the following test:
test one: the test is a method for brazing dissimilar metals of titanium alloy and nickel-based superalloy, and specifically comprises the following steps:
1. pretreatment of base materials: putting the cut base metal nickel-based superalloy K4648 and the base metal titanium alloy TA15 into alcohol, cleaning to remove greasy dirt and impurities attached to the surfaces in the cutting process, sequentially polishing the surfaces to be welded of the two base metals step by using 600-mesh and 1200-mesh water sand paper to remove coarse scratches and impurity layers on the surfaces, polishing the scratches by using metallographic sand paper, and polishing the scratches by using a diamond polishing agent with the granularity of 0.5 mu m to enable the surfaces to be welded to be bright; soaking two base metals, an AuNi eutectic solder, an AgCuTi solder and a soft interlayer Nb foil in alcohol, performing ultrasonic cleaning for 180s to remove impurities on the surfaces, and drying by a blower for later use; the thickness of the soft interlayer Nb foil is 100 mu m;
2. first step of brazing: forming a sandwich structure by the cleaned base metal nickel-based superalloy, the AuNi eutectic solder and the soft middle layer Nb foil in the vertical direction, wherein the AuNi eutectic solder is positioned in the middle, organic binder is coated between each layer, the graphite briquetting is arranged on the sandwich structure, the whole is placed in a vacuum furnace, and the vacuum is pumped to 6 multiplied by 10 -3 Pa, heating to 300 ℃ under the condition of heating rate of 10 ℃/min, and preserving heat for 20min to enable the organic binder added during assembly to be completely volatilized; then heating up under the condition of heating up rate of 10 ℃/minThe brazing temperature is 980 ℃ and the heat is preserved for 5min, then the temperature is reduced to 300 ℃ under the condition of 5 ℃/min, and then the semi-finished joint is obtained after the brazing temperature is reduced to room temperature along with the furnace; the organic binder is 502 glue;
3. and a second step of brazing: assembling the Nb end of the semi-finished joint prepared in the second step with the AgCuTi brazing filler metal cleaned in the first step and the parent metal titanium alloy cleaned in the first step in sequence, coating an organic binder between each layer, vertically placing the whole, placing a graphite briquetting at the uppermost part, integrally placing the whole in a vacuum furnace, vacuumizing, heating to 300 ℃ under the condition of heating rate of 10 ℃/min, and preserving heat for 20min to ensure that the organic binder added during assembly is completely volatilized; then heating to the brazing temperature of 850 ℃ at the heating rate of 10 ℃/min and preserving heat for 5min, then cooling to 300 ℃ at the cooling rate of 5 ℃/min, and then cooling to room temperature along with a furnace to obtain a joint; the organic binder is 502 glue.
The mechanical property of the soldered joint is tested by referring to GB/T11363-2008 "solder joint Strength test method", and the shear strength of the obtained joint at room temperature is 163MPa.
And (2) testing II: the first difference between this test and the test is: and thirdly, the brazing temperature is 830 ℃ and the temperature is kept for 5min. The others are the same as in test one.
The mechanical property of the soldered joint is tested for shear strength by referring to GB/T11363-2008 "method for testing the strength of soldered joint", and the shear strength of the joint at room temperature is 113MPa.
And (3) test III: the first difference between this test and the test is: and in the third step, the brazing temperature is 870 ℃ and the temperature is kept for 5min. The others are the same as in test one.
The shear strength of the obtained sample is tested according to the mechanical property reference GB/T11363-2008 "braze joint Strength test method", and the shear strength of the joint at room temperature is 106MPa.
And (3) testing four: the first difference between this test and the test is: and in the third step, the brazing temperature is 850 ℃ and the temperature is kept for 0min. The others are the same as in test one.
The mechanical property of the soldered joint is tested for shear strength by referring to GB/T11363-2008 "method for testing the strength of soldered joint", and the shear strength of the obtained joint at room temperature is 185MPa. Fig. 1 is a scanning electron micrograph of the braze joint finally obtained in test four, wherein 1 is nickel-base superalloy K4648,2 is titanium alloy TA15,3 is soft interlayer Nb,4 is AgCuTi braze, and 5 is AuNi eutectic braze.
Test five: the first difference between this test and the test is: and in the third step, the brazing temperature is 850 ℃ and the temperature is kept for 10min. The others are the same as in test one.
The shear strength of the obtained samples is tested according to the mechanical property reference GB/T11363-2008 "braze joint Strength test method", and the shear strength of the joints at room temperature is 151MPa.
Test six: the first difference between this test and the test is: and in the third step, the brazing temperature is 850 ℃ and the temperature is kept for 15min. The others are the same as in test one.
The mechanical property of the soldered joint is tested for shear strength by referring to GB/T11363-2008 "method for testing the strength of soldered joint", and the shear strength of the joint at room temperature is 125MPa.
Test seven: the test is a comparative test, adopts one-step welding, and comprises the following specific processes:
1. pretreatment of base materials: putting the cut base metal nickel-based superalloy K4648 and the base metal titanium alloy TA15 into alcohol, cleaning to remove greasy dirt and impurities attached to the surfaces in the cutting process, sequentially polishing the surfaces to be welded of the two base metals step by using 600-mesh and 1200-mesh water sand paper to remove coarse scratches and impurity layers on the surfaces, polishing the scratches by using metallographic sand paper, and polishing the scratches by using a diamond polishing agent with the granularity of 0.5 mu m to enable the surfaces to be welded to be bright; soaking the two base materials and the AuNi eutectic solder in alcohol, performing ultrasonic cleaning for 180s to remove impurities on the surfaces, and drying by a blower for later use;
2. first step of brazing: forming a sandwich structure by the two base materials cleaned in the first step and the AuNi eutectic solder in the vertical direction, wherein the AuNi eutectic solder is positioned in the middle, organic binder is coated between each layer, and the graphite briquetting is arranged in the sandwich structureStructurally, the whole body is placed in a vacuum furnace, and vacuumized to 6 multiplied by 10 -3 Pa, heating to 300 ℃ under the condition of heating rate of 10 ℃/min, and preserving heat for 20min to enable the organic binder added during assembly to be completely volatilized; then heating to the brazing temperature of 1000 ℃ at the heating rate of 10 ℃/min and preserving heat for 5min, then cooling to 300 ℃ at the cooling rate of 5 ℃/min, and then cooling to room temperature along with a furnace to obtain a finished joint; the organic binder is 502 glue.
The shear strength of the obtained samples is tested according to the mechanical property reference GB/T11363-2008 "braze joint Strength test method", and the shear strength of the joints at room temperature is 62MPa.
Claims (8)
1. The method for brazing the dissimilar metals of the titanium alloy and the nickel-based superalloy is characterized by comprising the following steps of:
1. pretreatment of base materials: putting the cut base metal nickel-based superalloy and the base metal titanium alloy into alcohol, cleaning to remove greasy dirt and impurities attached to the surfaces in the cutting process, sequentially polishing the surfaces to be welded of the two base metals step by using 600-mesh and 1200-mesh water sand paper to remove rough scratches and impurity layers on the surfaces, polishing the scratches by using metallographic sand paper, and finally polishing by using a diamond polishing agent with the granularity of 0.5 mu m to enable the surfaces to be welded to be bright; soaking two base metals, an AuNi eutectic solder, an AgCuTi solder and a soft interlayer Nb foil in alcohol for ultrasonic cleaning for 180-200 s to remove impurities on the surfaces, and drying by a blower for later use; the thickness of the soft interlayer Nb foil is 100-200 mu m;
the base metal nickel-based superalloy in the first step is K4648;
the base metal titanium alloy in the first step is TA15;
2. first step of brazing: forming a sandwich structure by the cleaned base metal nickel-based superalloy, the AuNi eutectic solder and the soft interlayer Nb foil in the vertical direction, wherein the AuNi eutectic solder is positioned in the middle, organic binder is coated between each layer, and the graphite briquetting is arrangedOn the sandwich structure, the whole body is placed in a vacuum furnace, and vacuumized until the vacuum degree is 6 multiplied by 10 -3 Pa, then heating to 300-320 ℃ and preserving heat for 20-25 min to enable the organic binder added during assembly to be completely volatilized; then heating to the brazing temperature of 950-1020 ℃ and preserving heat for 0-30 min, then cooling to 300-320 ℃, and then cooling to room temperature along with a furnace to obtain a semi-finished joint;
3. and a second step of brazing: assembling the Nb end of the semi-finished joint prepared in the second step with the AgCuTi brazing filler metal cleaned in the first step and the parent metal titanium alloy cleaned in the first step in sequence, coating an organic binder between each layer, vertically placing the whole, placing a graphite briquetting at the uppermost part, integrally placing the whole in a vacuum furnace, vacuumizing, heating to 300-320 ℃ and preserving heat for 20-25 min to enable the organic binder added during assembling to volatilize completely; then heating to brazing temperature of 820-875 ℃ and preserving heat for 0-20 min, then cooling to 300-320 ℃, and then cooling to room temperature along with a furnace to obtain the joint.
2. The method for dissimilar metal brazing of titanium alloy and nickel-based superalloy according to claim 1, wherein in step one, two base metals, auNi eutectic solder, agCuTi solder and soft interlayer Nb foil are immersed in alcohol and subjected to ultrasonic cleaning for 180s to remove impurities on the surface, and the materials are dried by a blower for later use.
3. A method for dissimilar metal brazing of a titanium alloy and a nickel-based superalloy according to claim 1, wherein the organic binder in step two is 502 paste.
4. A method for dissimilar metal brazing of a titanium alloy and a nickel-based superalloy according to claim 1, wherein in step two, the temperature is then raised to 300 ℃ and maintained for 20 minutes to fully volatilize the organic binder added during assembly.
5. The method for brazing dissimilar metals of titanium alloy and nickel-based superalloy according to claim 1, wherein in the second step, the brazing temperature is raised to 980 ℃ and kept for 5min, the temperature is lowered to 300 ℃, and the brazing temperature is cooled to room temperature along with a furnace, so that a semi-finished joint is obtained.
6. A method for dissimilar metal brazing of a titanium alloy to a nickel-based superalloy according to claim 1, wherein the organic binder in step three is 502 paste.
7. A method for dissimilar metal brazing of a titanium alloy and a nickel-based superalloy according to claim 1, wherein in step three, the temperature is then raised to 300 ℃ and maintained for 20 minutes to fully volatilize the organic binder added during assembly.
8. The method for brazing dissimilar metals of titanium alloy and nickel-based superalloy according to claim 1, wherein in step three, the brazing temperature is raised to 850 ℃ and kept for 0min, the temperature is lowered to 300 ℃, and the joint is obtained by cooling to room temperature with a furnace.
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