CN107398630A - The high intensity of tungsten and copper is directly connected to technique - Google Patents
The high intensity of tungsten and copper is directly connected to technique Download PDFInfo
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- CN107398630A CN107398630A CN201710503937.4A CN201710503937A CN107398630A CN 107398630 A CN107398630 A CN 107398630A CN 201710503937 A CN201710503937 A CN 201710503937A CN 107398630 A CN107398630 A CN 107398630A
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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
-
- 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
- B23K20/24—Preliminary treatment
-
- 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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- Pressure Welding/Diffusion-Bonding (AREA)
Abstract
The invention discloses the high intensity of a kind of tungsten and copper to be directly connected to technique, including：The pre-treatment such as tungsten bar and copper rod surface to be connected are polished, polished, is cleaned by ultrasonic；The face axiality to be connected of tungsten bar after pre-treatment and copper rod is docked; after pressurization is fixed under argon atmosphere; annealed under conditions of 970~1000 DEG C of annealing temperatures and 2.5~3.5h soaking times; realize the metallurgical binding in the diffusion and interface between two kinds of metals of tungsten and copper; it have successfully been obtained the high intensity connection between tungsten/copper; ultimate tensile strength has reached 193MPa, and bending strength has reached 165MPa.The present invention does not use intermediate metal layer, avoid influence and the hidden danger that third party's element is brought to material property, it is and simple to operate, without using hazardous chemicals such as highly acid, corrosivity, safety non-pollution, cost is low, has started new technology for the connection of non-solid-solution tungsten and copper, has met green development strategy.
Description
Technical field
The invention belongs to a kind of metal joining techniques, more particularly to a kind of non-solid-solution metal in antivacuum pressure condition
The lower technique that is directly connected to for realizing metallurgical binding, the high-strength metallurgical of specially bar-shaped tungsten and copper combine.
Background technology
Controlled thermonuclear fusion can be expected to turn into one of new century main energy sources, wherein towards plasma element be nuclear fusion
The crucial material part of engineering.Require that material not only with high temperature resistant but also there can be high thermal conductance towards plasma element, but it is existing
Material is difficult to fully meet its requirement, it is therefore desirable to connects exotic material and high conductivity material.Tungsten is rare height
Melting point metals (3410 DEG C), chemical property is more stable, has the characteristics of high-termal conductivity, high sputtering threshold value and low tritium are detained,
Be used widely as heat proof material in fields such as Aero-Space, the energy and electronics, and be confirmed as towards etc. from
Towards one of preferred material of superhigh temperature plasma material in daughter element.When being worked due to tungsten as facing plasma material
The heat flux on its surface is up to 0.1~1.0MW/m2, it is necessary to carry out quick heat radiating.And metallic copper has excellent heat conductivility,
Often used as heat sink material, the quick heat radiating of tungsten is acted on if copper and tungsten are attached into can and played.But
Due to tungsten and metallic copper in phasor it is non-solid-solution, generation heat is just (+33kJ/mol), and in thermal coefficient of expansion and molten
Differed greatly in terms of the physical properties such as point, thus be difficult to tungsten and connected with the high intensity of copper.
At present, tungsten mainly has following a few classes with copper connection method：One kind is soldering, and solder used in tungsten copper connection is mainly Cu
Base solder or Ag-Cu alloys, 160~200MPa strength of joint can be obtained, but solder and the binding mechanism of tungsten side are still
Mechanical snap, adhesion are restricted, and are needed to the strict control of welding process.One kind is diffusion welding (DW), mainly using difference
The metal being dissolved with tungsten, copper is as intermediate layer, such as Ti, Ni, Ti/Ni/Ti, but due to totality can be caused by adding intermediate layer
Thickness is uncontrollable, and introducing third party's metal can destroy the uniformity of system connection, produces uncertain influence to performance, holds
The defects of hidden is easily formed, for example Ni can produce ferromagnetism.Other methods, such as chemical vapour deposition technique (CVD), physics gas
The methods of phase sedimentation (PVD), plasma spraying, can not large-scale use etc. there is coating is whard to control, manufacturing cost is high
Defect.
The content of the invention
The defects of in order to overcome above-mentioned prior art, the present invention provide a kind of being directly connected to for tungsten and metallurgy of copper combination
Technique, successfully realize the high strength bond between bar-shaped tungsten/copper, tensile strength under antivacuum pressure condition and reach
193MPa, bending strength 165MPa, during be not directed to use with burn into hazardous chemicals, safety non-pollution, and have
Easy to operate, low cost and other advantages.
In order to solve the above-mentioned technical problem, the high intensity of a kind of tungsten and copper proposed by the present invention is directly connected to technique,
Comprise the following steps：
The pre-treatment of step 1) tungsten bar and copper rod：The surface to be connected of diameter and length identical tungsten bar and copper rod is beaten
Mill, is polished to minute surface, and 15~20min is cleaned by ultrasonic in absolute ethyl alcohol, is dried rear stand-by；
Step 2) tungsten bar and copper rod coaxially pressurize：The face to be connected of tungsten bar Jing Guo pre-treatment and copper rod is docked, with folder
Tool coaxially fixes tungsten bar and copper rod, then, applies 95~115MPa axial compressive force by fixture；
Step 3) bond anneal：The tungsten bar and copper rod that step 2) is fixed with fixture pressurization are put into annealing furnace and carry out argon
Gas shielded ambient anneal, annealing temperature are 970~1000 DEG C, and soaking time is furnace cooling after 2.5~3.5h, is cooled to room
Clamper for disassembling after temperature, take out the connector of the tungsten bar connected as one and copper rod.
Further, in step 1), the polishing is polished using abrasive paper for metallograph, and 1500# gold is only left on surface to be connected
High-precision polishing is carried out during the polishing vestige of phase sand paper, the high accuracy polishing is carried out with 0.5 μm of diamond polishing agent, and will
Surface to be connected is polished to mirror status, and the surface to be connected of bar is vertical with the axis of bar.
The high accuracy polishing reaches roughness Ra for 0.025-012 μm.
The surface to be connected of bar and the axis verticality error of bar are no more than 0.025mm.
In step 3), the annealing temperature is 0.90~0.92Tm, wherein, TmFor the fusing point of copper.
The tungsten bar connected as one and the tensile strength of the connector of copper rod that the present invention obtains are 158~193MPa, curved
Qu Qiangdu is 129~165MPa.
Compared with prior art, the beneficial effects of the invention are as follows：
The invention provides realize that what tungsten and copper high-strength metallurgical combined directly connect under a kind of antivacuum pressure condition
Technique is connect, by strictly being handled the surface to be connected of the bar-shaped fine copper of size identical and pure tungsten, it is in mirror status to make it,
Avoid scratch defects, using laser verify ensure high-axiality dock, and have selected suitable external pressure, annealing temperature and
Soaking time, under argon atmosphere, the metallurgical binding in the diffusion and interface between tungsten and copper metal is realized, is successfully obtained
Obtained the high intensity connection between tungsten/copper.
The present invention avoids introducing influence of third party's element to material property, will not change actual constituent and the production of connector
Raw additional properties, at the same avoid and deoil, etching etc. has dangerous pre-treatment operation, by making surface to be connected be in mirror-like
State, no marking defect, increase both contacts area.By rationally designing fixing device of pressurizeing, realize that sample high-axiality connects
Connect.The high intensity that metallic copper and tungsten are directly realized by by the annealing process that simply pressurizes connects, and the technique is not only applicable to bar-shaped
Tungsten/copper system, the property for being equally applicable to other shapes differ larger dissimilar metal system, and joint efficiency is higher, operable
Property good, safety non-pollution, broken the current limitation that tungsten and copper are connected using conventional method.Result of performance test is tested, tungsten/copper
The bonding ultimate tensile strength of connection can reach 193MPa, bending strength 165MPa.
Brief description of the drawings
Fig. 1 is the fixed schematic diagram of sample pressurization in the present invention, in figure：1- upper mounted plates, 2- upper spacers, 3- tungsten bars, 4- copper
Rod, 5- bolts, 6- nuts, 7- bottom plates, 8- lower clapboards, 9- laser vias, the grooves of 10- first, the grooves of 11- second.
Fig. 2 (a) is the top view of fixed plate 1 in present invention pressurization fixing device；
Fig. 2 (b) is the top view of division board 2 in present invention pressurization fixing device；
Fig. 3 is bond anneal process schematic representation in Joining Technology of the present invention；
Fig. 4 is tungsten/copper bonding bonding strength test stress strain curve figure；
Fig. 5 is tungsten/copper bonding bonding strength test buckling curve figure；
Fig. 6 (a) is tungsten/copper connection tension failure copper rod side pattern SEM figures of embodiment 2；
Fig. 6 (b) is tungsten/copper connection tension failure tungsten bar side pattern SEM figures of embodiment 2；
Fig. 7 (a) is the composition EDS figures in rectangle frame region in Fig. 6 (a)；
Fig. 7 (b) is the composition EDS figures in rectangle frame region in Fig. 6 (b).
Embodiment
Technical solution of the present invention is described in further detail with specific embodiment below in conjunction with the accompanying drawings, described is specific
Only the present invention is explained for embodiment, is not intended to limit the invention.
It is unrestricted that the high intensity of tungsten and copper of the present invention is directly connected in technique involved fixture structure, Fig. 1
Show it is available a kind of by tungsten bar and the co-axially fixed fixture of copper rod, the fixture include upper mounted plate 1, bottom plate 7,
Upper division board 2, lower division board 8 and two sets of specification identical bolt connection parts；The shape of the bottom plate 7 and upper mounted plate 1
With structure all same, fixed plate 1 and bottom plate 7 be thickness be 5mm molybdenum plate, the lower division board 8 and on every
From the shape and structure all same of plate 2, the upper division board 2 and lower division board 8 are Al of the thickness for 4mm2O3Potsherd.Institute
The one side middle position for stating upper mounted plate 1 is provided with the first groove 10 for being embedded in the upper division board 2, as shown in Figure 2 a, described
For the shape of the shape of first groove 10 and the upper division board 2 to coincideing, the depth of first groove 10 is 1mm, it is described on
Both sides in fixed plate 1 positioned at first groove 10 are equipped with bolt through-hole and laser vias 9, the diameter of the laser vias
For 0.5mm；The upper division board 2 is provided with the second groove 11 that setting-in is connected bar, as shown in Figure 2 a and 2 b, described the
The shape of two grooves 11 matches with the shape in the cross section of connected bar, and the depth of second groove 11 is 2mm.
The high intensity of embodiment 1, tungsten and copper is directly connected to technique, comprises the following steps：
The pre-treatment of step 1) tungsten bar and copper rod：
Polish on surface：It is respectively diameter 10mm by size, length 25mm tungsten bar (purity >=99.9%) and copper rod (purity
>=99.5%) surface to be connected is polished flat with 400#, 600#, 800#, 1000#, 1500# abrasive paper for metallograph successively, wherein,
A sand paper is often changed, polishing direction is rotated by 90 °, and is wholly absent to the preceding vestige of polishing together, 1500# is only left in final face to be connected
The polishing vestige of sand paper；
Polishing：The face to be connected that will be polished with sand paper, high-precision polishing is carried out with 0.5 μm of diamond polishing agent, and will
Surface to be connected is polished to mirror status, and roughness Ra is 0.025-012 μm (or surface smoothness is up to 13 grades)；And bar is treated
Connection surface is vertical with the axis of bar, and the error of perpendicularity is no more than 0.025mm.
It is cleaned by ultrasonic：
Tungsten bar after polishing and copper rod are immersed in absolute ethyl alcohol and are cleaned by ultrasonic 15min, is dried rear stand-by.
Step 2) tungsten bar and copper rod coaxially assemble pressurization：The face to be connected of tungsten bar Jing Guo pre-treatment and copper rod is docked,
Ensureing the seamless contact in face to be connected, fixture as shown in Figure 1 coaxially fixes tungsten bar and copper rod, in the present embodiment, tungsten bar 3 and copper
The diameter of rod 4 is 10mm, and length is 25mm, and upper, copper rod 4 is coaxial docking tungsten bar 3 under, upper and lower fixing plate 1,7 it is equal
For long by 45 × wide by 20 × thick 5mm molybdenum plate, on upper bottom plate 2,7 along its length at each 6mm of symmetrical centre or so
One bolt through-hole for passing through M6 bolts of processing, the lines of centres of two bolt through-holes is with place fixed plate Central Symmetry point same
On straight line, and the straight line is parallel with the long side in the fixed plate of place.Upper and lower dividing plate 2,8 is long by 15 × wide by 15 × thick 4mm
Al2O3Potsherd.In order that pressurization stationary fixture is stable, ensures the axiality of tungsten copper rod, fixture used exists in the present invention
The first groove 10 of 15 × 15 × 1mm rectangle is equipped with the center of upper and lower fixing plate 1,7, in upper and lower fixing plate 1,7
One is machined at each 14mm in the equal left and right of width and is used for the Φ 0.5mm laser vias 9 that laser irradiation coaxially verifies.It is upper,
10 × 2mm of Φ the second circular groove 11 is equipped with the center of lower division board 2,8, as shown in Fig. 2 (a) and Fig. 2 (b).Tungsten
When rod 3 and copper rod 4 coaxially assemble, the one end in the disconnected face of tungsten bar 3 is embedded in the second circular groove 11 of upper division board 2
It is interior, in the first groove 10 of then rectangle that division board on this 2 is embedded in upper mounted plate 1.The one end in 4 disconnected face of copper rod is embedding
Enter in the second circular groove 11 of lower division board 8, and the outside of lower division board 8 is embedded in the first of the rectangle of bottom plate 7
In groove 10.As shown in Figure 1.
After insertion, the stainless Steel Bolt that is each passed through in two bolts hole of upper bottom plate 1,7, and select
The pretension of top nut 6, during pretension, guarantee makes tungsten bar 3 and copper rod 4 is coaxial docking and is in fixture symmetric position.After stable, use
Laser irradiation Φ 0.5mm laser vias 9, whether laser is observed simultaneously by the laser vias 9 of upper bottom plate, if by,
And error is no more than 2.5 μm, then shows that axiality reaches requirement.It is final after verification to rotate each bolt using torque wrench
On nut 6 and to apply moment of torsion be 9Nm, according to formulaThe pressure F acted at sample axis is obtained, wherein k is
Coefficient, i.e., 0.2, dSpiral shellFor stainless steel bolt diameter, further according to formulaObtain the copper rod and tungsten bar for being applied to a diameter of d
On axis pressure, i.e. 95MPa axial compressive force.
In addition, cleaning surface with alcohol respectively to upper and lower fixing plate and upper and lower division board before fixed pressurization, then enter luggage
Match somebody with somebody.
Step 3) bond anneal：The tungsten bar 3 and copper rod 4 that step 2) is fixed with fixture pressurization are put into annealing furnace and carried out
Argon atmosphere is annealed, and annealing temperature is 980 DEG C, soaking time 3h, as shown in Figure 3：It is warming up to 5 DEG C/min speed
250 DEG C, 10min is incubated at 250 DEG C, is then warming up to 980 DEG C with 10 DEG C/min speed, is incubated at 980 DEG C after 3h with stove
It is cooled to room temperature.Finally, pressurization stationary fixture is removed, takes out the connector of the tungsten bar connected as one and copper rod.
The high intensity of embodiment 2, tungsten and copper is directly connected to technique, and step and embodiment one are essentially identical, and difference is only
For：In step 2), the axial compressive force fixed on copper rod and tungsten bar of being pressurizeed with fixture is changed to 105MPa by 95MPa.Fig. 6 (a) is real
Apply tungsten/copper connection tension failure copper rod side pattern SEM figures of example 2；Fig. 6 (b) is tungsten/copper connection tension failure tungsten of embodiment 2
Rod side pattern SEM schemes；Fig. 7 (a) is the composition EDS figures in rectangle frame region in Fig. 6 (a)；Fig. 7 (b) is rectangle frame area in Fig. 6 (b)
The composition EDS figures in domain.
The high intensity of embodiment 3, tungsten and copper is directly connected to technique, and step and embodiment one are essentially identical, and difference is only
For：In step 2), the axial compressive force fixed on copper rod and tungsten bar of being pressurizeed with fixture is changed to 115MPa by 95MPa.
The high intensity of embodiment 4, tungsten and copper is directly connected to technique, and step and embodiment one are essentially identical, and difference is only
For：In step 2), the axial compressive force fixed on copper rod and tungsten bar of being pressurizeed with fixture is changed to 105MPa by 95MPa；In step 3), move back
Fiery temperature is changed to 970 DEG C by 980 DEG C.
The high intensity of embodiment 5, tungsten and copper is directly connected to technique, and step and embodiment one are essentially identical, and difference is only
For：In step 2), the axial compressive force fixed on copper rod and tungsten bar of being pressurizeed with fixture is changed to 105MPa by 95MPa；In step 3), move back
Fiery temperature is changed to 1000 DEG C by 980 DEG C.
The high intensity of embodiment 6, tungsten and copper is directly connected to technique, and step and embodiment one are essentially identical, and difference is only
For：In step 2), the axial compressive force fixed on copper rod and tungsten bar of being pressurizeed with fixture is changed to 105MPa by 95MPa；In step 3), move back
Fiery soaking time is changed to 2.5h by 3h.
The high intensity of embodiment 7, tungsten and copper is directly connected to technique, and step and embodiment one are essentially identical, and difference is only
For：In step 2), the axial compressive force fixed on copper rod and tungsten bar of being pressurizeed with fixture is changed to 105MPa by 95MPa；In step 3), move back
Fiery soaking time is changed to 3.5h by 3h.
The strength test for tungsten/copper connector that the embodiment of the present invention 1 to 7 obtains.
The tensile strength test of tungsten/copper connector, in electronic universal tester (model CSS 1, Changchun experiment
Machine is produced) extension test is carried out, draw speed 3mm/min, tungsten/copper interfacial fracture is stretched to, records maximum load now
Lotus FN, tensile strength curve is shown in accompanying drawing 4.With Image-Pro Plus softwares (Media Cybernetics companies of U.S. image point
Analyse software) measurement area of fracture S, according to formulaObtain the bonding strength σ of tungsten/copper connector.
The bending strength test of tungsten/copper connector, in electronic universal tester (model CSS 1, Changchun experiment
Machine is produced) crooked test is carried out, loading velocity 2mm/min, span L=40mm, tungsten/copper interfacial fracture is loaded onto, remembered
The maximum load F of record nowbb, bending strength curve is shown in accompanying drawing 5.With Image-Pro Plus softwares (U.S. Media
Cybernetics companies image analysis software) survey calculation fracture diameter d, according to formulaTungsten/copper is calculated to connect
The bending strength σ of fittingbb。
Table 1 be different moulding pressures (95~115MPa), annealing temperature (970~1000 DEG C) and soaking time (2.5~
3.5h) stretching under parameter, bending data, corresponding stretching, the test curve bent are as shown in Figure 4 and Figure 5.
Table 1
As shown in Table 1, after metal tungsten bar and copper rod being linked together using the inventive method, tensile strength 158~
193MPa, 129~165MPa of bending strength, there is preferable bond strength.
The tungsten that the embodiment of the present invention 2 obtains/copper connector stretching fracture pattern SEM figures, as shown in Fig. 6 (a) and Fig. 6 (b),
Shown in designated area composition Auger electron spectroscopy (EDS) composition, respectively Fig. 7 (a) and Fig. 7 (b)；The result of energy spectrum analysis shows
Show, copper section designated area only exists copper, percentage by weight 100%, and tungsten section designated area element is tungsten and copper, is weighed
It is respectively 56.95% and 43.05% to measure percentage, shows pressurized annealing, copper constantly spreads into tungsten, so that having on tungsten surface
The presence of copper.
Although above in conjunction with accompanying drawing, invention has been described, and the invention is not limited in above-mentioned specific implementation
Mode, above-mentioned embodiment is only schematical, rather than restricted, and one of ordinary skill in the art is at this
Under the enlightenment of invention, without deviating from the spirit of the invention, many variations can also be made, these belong to the present invention's
Within protection.
Claims (6)
1. the high intensity of a kind of tungsten and copper is directly connected to technique, it is characterised in that comprises the following steps：
The pre-treatment of step 1) tungsten bar and copper rod：The surface to be connected of diameter and length identical tungsten bar and copper rod is polished, thrown
Light is cleaned by ultrasonic 15~20min in absolute ethyl alcohol, dried rear stand-by to minute surface；
Step 2) tungsten bar and copper rod coaxially pressurize：The face to be connected of tungsten bar Jing Guo pre-treatment and copper rod is docked, will with fixture
Tungsten bar and copper rod are coaxially fixed, and then, apply 95~115MPa axial compressive force by fixture；
Step 3) bond anneal：The tungsten bar and copper rod that step 2) is fixed with fixture pressurization are put into annealing furnace and carry out argon gas guarantor
Ambient anneal is protected, annealing temperature is 970~1000 DEG C, and soaking time is furnace cooling after 2.5~3.5h, after being cooled to room temperature
Clamper for disassembling, take out the connector of the tungsten bar connected as one and copper rod.
2. the high intensity of tungsten and copper is directly connected to technique according to claim 1, it is characterised in that in step 1), institute
State polishing to polish using abrasive paper for metallograph, surface to be connected carries out high accuracy when only leaving the polishing vestige of 1500# abrasive paper for metallograph
Polishing, the high accuracy polishing is carried out with 0.5 μm of diamond polishing agent, and surface to be connected is polished into mirror status, and
The surface to be connected of bar is vertical with the axis of bar.
3. the high intensity of tungsten and copper is directly connected to technique according to claim 2, it is characterised in that the high accuracy is thrown
Light reaches roughness Ra for 0.025-012 μm.
4. the high intensity of tungsten and copper is directly connected to technique according to claim 2, it is characterised in that bar it is to be connected
The axis verticality error of surface and bar is no more than 0.025mm.
5. the high intensity of tungsten and copper is directly connected to technique according to claim 1, it is characterised in that in step 3), institute
It is 0.90~0.92T to state annealing temperaturem, wherein, TmFor the fusing point of copper.
6. the high intensity of tungsten and copper is directly connected to technique according to claim 1, it is characterised in that the connection obtained
The tungsten bar and the tensile strength of the connector of copper rod being integrated are 158~193MPa, and bending strength is 129~165MPa.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110576252A (en) * | 2019-04-13 | 2019-12-17 | 天津大学 | Oxygen-free copper and chromium zirconium copper medium and low temperature direct diffusion connection method |
| CN110578159A (en) * | 2019-07-24 | 2019-12-17 | 天津大学 | Tungsten-chromium-zirconium-copper pipe penetrating structure connecting method based on tungsten ring inner surface nano porosification |
| CN111940743A (en) * | 2020-08-13 | 2020-11-17 | 山东威尔斯通钨业有限公司 | Preparation method of tungsten and copper solderless seamless connection combined part |
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| CN105234547A (en) * | 2015-10-20 | 2016-01-13 | 兰微悦美（天津）科技有限公司 | Connecting process for metals without mutual solid solution |
| CN105537750A (en) * | 2016-01-20 | 2016-05-04 | 天津大学 | High-strength connection process for copper-niobium rodlike metals under non-vacuum low-pressure condition |
| CN105537751A (en) * | 2016-02-05 | 2016-05-04 | 兰微悦美（天津）科技有限公司 | Connection process for metal silver and tantalum not capable of being dissolved in each other in solid mode |
| CN105522245A (en) * | 2016-03-01 | 2016-04-27 | 江苏科技大学 | High-strength connection process for same materials of W-Cu alloy |
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| CN110576252A (en) * | 2019-04-13 | 2019-12-17 | 天津大学 | Oxygen-free copper and chromium zirconium copper medium and low temperature direct diffusion connection method |
| CN110578159A (en) * | 2019-07-24 | 2019-12-17 | 天津大学 | Tungsten-chromium-zirconium-copper pipe penetrating structure connecting method based on tungsten ring inner surface nano porosification |
| CN111940743A (en) * | 2020-08-13 | 2020-11-17 | 山东威尔斯通钨业有限公司 | Preparation method of tungsten and copper solderless seamless connection combined part |
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