CN115106639A - Method for connecting multi-bronze/two-phase titanium alloy bimetal - Google Patents
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- 229910000906 Bronze Inorganic materials 0.000 title claims abstract description 83
- 239000010974 bronze Substances 0.000 title claims abstract description 83
- 229910001069 Ti alloy Inorganic materials 0.000 title claims abstract description 75
- 238000000034 method Methods 0.000 title claims abstract description 40
- KUNSUQLRTQLHQQ-UHFFFAOYSA-N copper tin Chemical compound [Cu].[Sn] KUNSUQLRTQLHQQ-UHFFFAOYSA-N 0.000 claims abstract description 62
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 claims abstract description 30
- 238000007731 hot pressing Methods 0.000 claims abstract description 19
- 230000007704 transition Effects 0.000 claims abstract description 17
- 238000005245 sintering Methods 0.000 claims abstract description 15
- 238000004140 cleaning Methods 0.000 claims abstract description 14
- 238000005498 polishing Methods 0.000 claims abstract description 11
- 238000009792 diffusion process Methods 0.000 claims abstract description 9
- 239000000203 mixture Substances 0.000 claims abstract description 9
- 239000002253 acid Substances 0.000 claims abstract description 4
- 238000010438 heat treatment Methods 0.000 claims description 32
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 11
- 229910052782 aluminium Inorganic materials 0.000 claims description 7
- 238000001816 cooling Methods 0.000 claims description 7
- 238000005304 joining Methods 0.000 claims description 7
- KRHYYFGTRYWZRS-UHFFFAOYSA-N Fluorane Chemical compound F KRHYYFGTRYWZRS-UHFFFAOYSA-N 0.000 claims description 6
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 claims description 6
- 229910017604 nitric acid Inorganic materials 0.000 claims description 6
- 238000005554 pickling Methods 0.000 claims description 6
- 238000002791 soaking Methods 0.000 claims description 6
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical group [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 5
- LQBJWKCYZGMFEV-UHFFFAOYSA-N lead tin Chemical compound [Sn].[Pb] LQBJWKCYZGMFEV-UHFFFAOYSA-N 0.000 claims description 5
- 238000004506 ultrasonic cleaning Methods 0.000 claims description 5
- 235000019441 ethanol Nutrition 0.000 claims description 3
- 229910052751 metal Inorganic materials 0.000 claims 4
- 239000002184 metal Substances 0.000 claims 4
- 229910002063 parent metal alloy Inorganic materials 0.000 claims 1
- 239000011888 foil Substances 0.000 description 8
- 229910000765 intermetallic Inorganic materials 0.000 description 6
- 239000000463 material Substances 0.000 description 6
- 229910045601 alloy Inorganic materials 0.000 description 4
- 239000000956 alloy Substances 0.000 description 4
- 230000007547 defect Effects 0.000 description 4
- 238000001514 detection method Methods 0.000 description 4
- 238000004321 preservation Methods 0.000 description 4
- 238000003825 pressing Methods 0.000 description 4
- 229910052709 silver Inorganic materials 0.000 description 4
- 239000004332 silver Substances 0.000 description 4
- 229910001040 Beta-titanium Inorganic materials 0.000 description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 3
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 3
- 229910052802 copper Inorganic materials 0.000 description 3
- 239000010949 copper Substances 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000002844 melting Methods 0.000 description 3
- 230000008018 melting Effects 0.000 description 3
- 238000002156 mixing Methods 0.000 description 3
- 239000010953 base metal Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000000903 blocking effect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000005496 eutectics Effects 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 229910052745 lead Inorganic materials 0.000 description 2
- 150000002736 metal compounds Chemical class 0.000 description 2
- 229910001092 metal group alloy Inorganic materials 0.000 description 2
- 230000008520 organization Effects 0.000 description 2
- 238000005204 segregation Methods 0.000 description 2
- 229910052718 tin Inorganic materials 0.000 description 2
- 229910001369 Brass Inorganic materials 0.000 description 1
- 229910000881 Cu alloy Inorganic materials 0.000 description 1
- 229910000570 Cupronickel Inorganic materials 0.000 description 1
- 238000005275 alloying Methods 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000010951 brass Substances 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 238000007781 pre-processing Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 239000010936 titanium Substances 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
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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
- B23K20/00—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating
- B23K20/001—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating by extrusion or drawing
-
- 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
- B23K20/00—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating
- B23K20/14—Preventing or minimising gas access, or using protective gases or vacuum during welding
-
- 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
- B23K20/00—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating
- B23K20/16—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating with interposition of special material to facilitate connection of the parts, e.g. material for absorbing or producing gas
-
- 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
- B23K20/00—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating
- B23K20/22—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating taking account of the properties of the materials to be welded
- B23K20/233—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating taking account of the properties of the materials to be welded without ferrous layer
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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
- B23K20/00—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating
- B23K20/24—Preliminary treatment
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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
The invention discloses a method for connecting multi-bronze/two-phase titanium alloy bimetal, which comprises the following steps: step 1, processing bronze and two-phase titanium alloy into a cylinder for later use; taking a pure silver foil as an intermediate transition layer, polishing and then preserving in vacuum for later use; step 2, polishing the surfaces of the bronze and the two-phase titanium alloy processed in the step 1, respectively performing acid cleaning after polishing, then cleaning, and obtaining the pretreated bronze and titanium alloy after cleaning; and 3, sequentially matching the pretreated titanium alloy and bronze obtained in the step 2 with the pure silver foil stored in the step 1 according to the sequence of the titanium alloy, the pure silver foil and the bronze, placing the mixture in a mold, and performing vacuum interface diffusion connection in a vacuum hot-pressing sintering furnace to obtain the multi-element bronze/two-phase titanium alloy bimetallic sample. The problems of high implementation difficulty and poor bonding strength when different types of bronze and titanium alloy are connected are solved.
Description
Technical Field
The invention belongs to the technical field of bimetal preparation, and relates to a method for connecting multi-bronze/two-phase titanium alloy bimetal.
Background
The copper alloy mainly comprises three main types of cupronickel, bronze and brass, wherein the bronze has the characteristics of low melting point, high hardness, strong plasticity, wear resistance, corrosion resistance, bright color and the like, and is suitable for casting various mechanical parts, bearings, gears and the like. Titanium alloys are mainly classified into alpha titanium alloys, beta titanium alloys, and alpha + beta titanium alloys. The alpha + beta titanium alloy is a two-phase alloy, has good comprehensive mechanical property, good structural stability, high-temperature strength, light weight and high strength, and is an important structural material in the aerospace industry. The bronze/titanium alloy bimetal material complements the advantages of light weight, high strength and wear resistance, and has wide application prospect in the field of advanced equipment such as aerospace and the like.
Currently, in the research on the bronze/titanium alloy bimetal connection method, because the physical differences between copper and titanium are large, a plurality of intermetallic compounds are formed on the interface during connection, so that the connection strength is extremely poor, and the addition of an intermediate transition layer for connection can effectively reduce or inhibit the formation of the intermetallic compounds, which becomes a great development trend of the bronze/titanium alloy bimetal connection technology. However, the difference of alloy elements of bronzes of different systems is large, different intermediate transition layers need to be added when the multi-element bronze is connected with the two-phase titanium alloy, and the difference of the connection process is large, so that the application of the bronze/titanium alloy bimetal material is limited. In summary, a new process method is needed to be provided, and the high-efficiency and reliable connection of the multi-element bronze/titanium alloy bimetallic material is realized, so that different service environments are met.
Disclosure of Invention
The invention aims to provide a method for connecting multi-bronze/two-phase titanium alloy bimetal, which solves the problems of high implementation difficulty and poor bonding strength when different types of bronze are connected with titanium alloy.
The technical scheme adopted by the invention is that the method for connecting the multi-bronze/two-phase titanium alloy bimetal specifically comprises the following steps:
step 1, processing bronze and two-phase titanium alloy into a cylinder for later use; taking a pure silver foil as an intermediate transition layer, polishing and then preserving in vacuum for later use;
step 2, polishing the surfaces of the bronze and the two-phase titanium alloy processed in the step 1, respectively performing acid cleaning after polishing, then cleaning, and obtaining the pretreated bronze and titanium alloy after cleaning;
and 3, sequentially matching the pretreated titanium alloy and bronze obtained in the step 2 with the pure silver foil stored in the step 1 according to the sequence of the titanium alloy, the pure silver foil and the bronze, placing the mixture in a mold, and performing vacuum interface diffusion connection in a vacuum hot-pressing sintering furnace to obtain the multi-element bronze/two-phase titanium alloy bimetallic sample.
The invention is also characterized in that:
in the step 1, the sizes of bronze and two-phase titanium alloy are the same; the diameter of the pure silver foil of the intermediate transition layer is kept to be the same as that of the base metal alloy; the bronze is aluminum bronze or tin-lead bronze.
In the step 2: the pickling process comprises the following specific steps: soaking bronze into 10% nitric acid alcohol solution for pickling for 1-5 min; soaking the titanium alloy in a solution containing 7% of hydrofluoric acid, 10% of nitric acid and 83% of absolute ethyl alcohol for 10-60 s; and the cleaning is carried out for 5-10 min by adopting absolute ethyl alcohol ultrasonic cleaning.
In the step 2, absolute ethyl alcohol is adopted for ultrasonic cleaning for 5-10 min.
In step 3, the vacuum interface diffusion bonding process specifically comprises: the vacuum degree of the vacuum hot-pressing sintering furnace reaches 6.67 multiplied by 10 -3 Pa～6.67×10 -2 Heating after Pa in a heating modeHeating in a stepwise manner, namely heating to 600 ℃ at a heating rate of 20 ℃/min, and then heating to 725-875 ℃ at a heating rate of 15 ℃/min. And then preserving heat at the temperature, simultaneously applying 100-300 kgf, and cooling along with the furnace to obtain the multi-bronze/two-phase titanium alloy bimetal sample.
The method for connecting the multi-element bronze/two-phase titanium alloy bimetal has the advantages that the high-quality connection of the titanium alloy and the multi-element bronze is realized, the method for connecting the multi-element bronze/two-phase titanium alloy bimetal by adding the same intermediate transition layer, namely the pure silver foil material is provided, the implementation difficulty of process conditions is reduced, and the method has high practical value. Silver and copper do not form intermetallic compounds, and only eutectic reaction with low melting point occurs; silver and titanium form a few kinds of metal compounds and the conditions are complicated. The pure silver foil is used as an intermediate transition layer, has different effects on different elements in the multi-element bronze: the segregation of Sn and Pb elements to the interface is effectively avoided, and the occurrence of defects such as cracks and the like is reduced; can block the diffusion of elements such as Al, Fe and the like, forms a good blocking layer on an interface and reduces the content of intermetallic compounds. Therefore, the pure silver foil can simultaneously play a certain beneficial role on various bronzes, and the interface organization structure is improved, so that the effective interface connection of the bronzes and the titanium alloy is realized, the formed multi-bronze/two-phase titanium alloy bimetal can meet different service environment requirements, and the interface shear strength can reach 188.71MPa at most.
Drawings
FIG. 1 is a structural diagram of a ZCuSn10Pb1/TC6 bimetal interface in example 1 of the connection method of multi-bronze/two-phase titanium alloy bimetal of the invention;
FIG. 2 is a structural diagram of the interface of QAl10-5-5/TC6 bimetal in example 3 of the method for joining multi-bronze/two-phase titanium alloy bimetal according to the present invention;
FIG. 3 is a schematic diagram of the shear strength curve of the multi-bronze/two-phase titanium alloy bimetal connection method ZCuSn10Pb1/TC6 bimetal of the invention;
FIG. 4 is a shear strength curve of the multi-component bronze/two-phase titanium alloy bimetal joining method QAl10-5-5/TC6 bimetal of the present invention.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.
The invention relates to a method for connecting multi-bronze/two-phase titanium alloy bimetal, which comprises the following steps:
step 1, processing bronze (including aluminum bronze or tin-lead bronze) and two-phase titanium alloy into a cylinder. Preparing an intermediate transition layer, namely a pure silver foil, polishing and then preserving in vacuum for later use; the outer diameter sizes of different bronzes and two-phase titanium alloys of the cylinder are both 20mm, the height is 25mm, the diameter size of the pure silver foil of the middle transition layer is 20mm, and the diameter of the pure silver foil is the same as that of the base metal alloy.
Step 2, preprocessing bronze and titanium alloy, namely polishing the surfaces of the bronze and titanium alloy, respectively carrying out acid washing, then cleaning, and obtaining preprocessed bronze and titanium alloy after cleaning;
the pickling process comprises the following specific steps: soaking bronze into 10% nitric acid alcohol solution for pickling for 1-5 min; soaking the titanium alloy in a solution containing 7% of hydrofluoric acid (40%), 10% of nitric acid (65%) and 83% of absolute ethyl alcohol for 10-60 s. And cleaning by adopting absolute ethyl alcohol ultrasonic cleaning for 5-10 min.
And 3, sequentially matching the pretreated titanium alloy and bronze obtained in the step 2 with the pure silver foil stored in the step 1 in sequence according to the sequence of the titanium alloy, the pure silver foil and the bronze, placing the mixture in a mold, and performing vacuum interface diffusion connection in a vacuum hot-pressing sintering furnace to obtain the multi-element bronze/two-phase titanium alloy bimetallic sample.
In step 3, the vacuum interface diffusion bonding process specifically comprises: the vacuum degree of the vacuum hot-pressing sintering furnace reaches 6.67 multiplied by 10 -3 Pa～6.67×10 -2 And (3) heating after Pa, wherein the heating mode adopts step heating, namely heating to 600 ℃ at the heating rate of 20 ℃/min, and heating to 725-875 ℃ at the heating rate of 15 ℃/min. And then preserving heat at the temperature, simultaneously applying 100-300 kgf, and cooling along with the furnace to obtain the multi-bronze/two-phase titanium alloy bimetal sample.
Example 1
Processing tin-lead bronze (ZCuSn 10Pb1) with the brand number of ZCuSn10Pb1 and titanium alloy (TC 6) with the brand number of TC6 into a cylinder with phi 20mm multiplied by 25mm, and preparing an intermediate transition layer pure silver foil with phi 20 mm; pretreating ZCuSn10Pb1, TC6 and Ag foil, and then preserving in vacuum for later use;
sequentially mixing the pretreated TC6, Ag foil and ZCuSn10Pb1, putting the mixture into a hot-pressing die, putting the die into a vacuum hot-pressing sintering furnace, and when the vacuum degree in the vacuum hot-pressing sintering furnace reaches 7.20 multiplied by 10 -3 And (3) heating after Pa, keeping the temperature for 60min after the heating temperature reaches 800 ℃, simultaneously applying pressure 157kgf, and cooling along with the furnace after the heating and heat preservation processes are finished to obtain the ZCuSn10Pb1/TC6 bimetal sample. The metallographic specimen was observed for structure, and it was found that the interface bonding was good and defects such as voids and cracks were not generated, as shown in fig. 1. Through mechanical property detection, as shown in fig. 3, the interface shear strength can reach 186.22 MPa.
Example 2
Processing tin-lead bronze (ZCuSn 10Pb10) with the brand number of ZCuSn10Pb10 and titanium alloy (TC 6) with the brand number of TC6 into a cylinder with phi 20mm multiplied by 25mm, and preparing a middle transition layer pure silver foil with phi 20 mm; pretreating ZCuSn10Pb10, TC6 and Ag foil, and then preserving in vacuum for later use;
sequentially mixing the pretreated TC6, Ag foil and ZCuSn10Pb10, putting the mixture into a hot-pressing die, putting the die into a vacuum hot-pressing sintering furnace, and when the vacuum degree in the vacuum hot-pressing sintering furnace reaches 6.80 multiplied by 10 -3 And (3) heating after Pa, keeping the temperature for 60min after the heating temperature reaches 775 ℃, simultaneously applying pressure 157kgf, and cooling the product along with the furnace after the heating and heat preservation processes are finished to obtain the ZCuSn10Pb10/TC6 bimetal sample. The interface shear strength is 80.26MPa through mechanical property detection.
Example 3
Processing aluminum bronze (QAl 10-5-5) with the mark of QAl10-5-5 and titanium alloy (TC 6) with the mark of TC6 into a cylinder with phi 20mm multiplied by 25mm, and preparing pure silver foil of an intermediate transition layer with phi 20 mm; pretreating QAL10-5-5, TC6 and Ag foil, and then preserving in vacuum for later use;
sequentially matching the pretreated TC6, Ag foil and QAl10-5-5, putting the mixture into a hot-pressing die, and placingPutting the mixture into a vacuum hot-pressing sintering furnace, and when the vacuum degree in the vacuum hot-pressing sintering furnace reaches 6.40 multiplied by 10 -3 And (3) heating after Pa, keeping the temperature for 60min after the heating temperature reaches 850 ℃, simultaneously applying pressure 157kgf, and cooling the product along with the furnace after the heating and heat preservation processes are finished to obtain a QAl10-5-5/TC6 bimetal sample. The metallographic specimen of the sample is observed to have a structure, so that the interface bonding is good, and no obvious defect exists, as shown in figure 2. Through mechanical property detection, as shown in fig. 4, the interface shear strength can reach 188.71 MPa.
Example 4
Processing aluminum bronze (QAl 10-4-4) with the mark QAl10-4-4 and titanium alloy (TC 6) with the mark TC6 into a cylinder with phi 20mm multiplied by 25mm, and preparing pure silver foil of an intermediate transition layer with phi 20 mm; pretreating QAL10-4-4, TC6 and Ag foil, and then preserving in vacuum for later use;
sequentially mixing the pretreated TC6, Ag foil and QAl10-4-4, putting the mixture into a hot-pressing die, putting the die into a vacuum hot-pressing sintering furnace, and when the vacuum degree in the vacuum hot-pressing sintering furnace reaches 6.70 multiplied by 10 -3 And (3) heating after Pa, keeping the temperature for 60min after the heating temperature reaches 850 ℃, simultaneously applying pressure 157kgf, and cooling the product along with the furnace after the heating and heat preservation processes are finished to obtain a QAl10-4-4/TC6 bimetal sample. The interface shear strength is 135.6MPa by mechanical property detection.
The method for connecting the multi-element bronze/two-phase titanium alloy bimetal realizes high-quality connection of the titanium alloy and the multi-element bronze, and simultaneously provides a method for adding the same intermediate transition layer, namely the pure silver foil, and simultaneously preparing the multi-element bronze/two-phase titanium alloy bimetal material, so that the implementation difficulty of process conditions is reduced, and the method has practical value. Silver and copper do not form intermetallic compounds, and only eutectic reaction with low melting point occurs; silver and titanium form a few kinds of metal compounds and the conditions are complicated. The pure silver foil is used as an intermediate transition layer, has different effects on different elements in the multi-element bronze: the segregation of Sn and Pb elements to the interface is effectively avoided, and the occurrence of defects such as cracks and the like is reduced; can block the diffusion of elements such as Al, Fe and the like, forms a good blocking layer on an interface and reduces the content of intermetallic compounds. Therefore, the pure silver foil can simultaneously play a certain beneficial role on various bronzes, and the interface organization structure is improved, so that the effective interface connection of the bronzes and the titanium alloy is realized, the formed multi-bronze/two-phase titanium alloy bimetal can meet different service environment requirements, and the interface bonding strength is higher. Table 1 below shows the proportions of the alloying elements for the different bronze grades in the examples.
TABLE 1
Claims (6)
1. The method for connecting the multi-bronze/two-phase titanium alloy bimetal is characterized by comprising the following steps of: the method specifically comprises the following steps:
step 1, processing bronze and two-phase titanium alloy into a cylinder for later use; taking a pure silver foil as an intermediate transition layer, polishing and then preserving in vacuum for later use;
step 2, polishing the surfaces of the bronze and the two-phase titanium alloy processed in the step 1, respectively performing acid cleaning after polishing, then cleaning, and obtaining the pretreated bronze and titanium alloy after cleaning;
and 3, sequentially matching the pretreated titanium alloy and bronze obtained in the step 2 with the pure silver foil stored in the step 1 according to the sequence of the titanium alloy, the pure silver foil and the bronze, placing the mixture in a mold, and performing vacuum interface diffusion connection in a vacuum hot-pressing sintering furnace to obtain the multi-element bronze/two-phase titanium alloy bimetallic sample.
2. The method of joining a multi-bronze/two-phase titanium alloy bi-metal according to claim 1, wherein: in the step 1, the sizes of bronze and two-phase titanium alloy are the same; the diameter of the intermediate transition layer pure silver foil is kept the same as that of the parent metal alloy.
3. The method of joining a multi-bronze/two-phase titanium alloy bimetal according to claim 2, wherein: the bronze is aluminum bronze or tin-lead bronze.
4. The method of joining a multi-bronze/two-phase titanium alloy bi-metal according to claim 3, wherein: in the step 2: the pickling process comprises the following specific steps: soaking bronze into 10% nitric acid alcohol solution for pickling for 1-5 min; soaking the titanium alloy in a solution containing 7% of hydrofluoric acid, 10% of nitric acid and 83% of absolute ethyl alcohol for 10-60 s; and cleaning by adopting absolute ethyl alcohol ultrasonic cleaning for 5-10 min.
5. The method of joining a multi-bronze/two-phase titanium alloy bi-metal according to claim 4, wherein: in the step 2, absolute ethyl alcohol is adopted for ultrasonic cleaning for 5-10 min.
6. The method of joining a multi-bronze/two-phase titanium alloy bi-metal according to claim 1, wherein: in the step 3, the vacuum interface diffusion bonding process specifically comprises the following steps: the vacuum degree of the vacuum hot-pressing sintering furnace reaches 6.67 multiplied by 10 -3 Pa～6.67×10 -2 And (3) heating after Pa, wherein the heating mode adopts step heating, namely heating to 600 ℃ at the heating rate of 20 ℃/min, and heating to 725-875 ℃ at the heating rate of 15 ℃/min. And then preserving heat at the temperature, simultaneously applying 100-300 kgf, and cooling along with the furnace to obtain the multi-bronze/two-phase titanium alloy bimetal sample.
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