CN105537750A - High-strength connection process for copper-niobium rodlike metals under non-vacuum low-pressure condition - Google Patents
High-strength connection process for copper-niobium rodlike metals under non-vacuum low-pressure condition Download PDFInfo
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- CN105537750A CN105537750A CN201610039772.5A CN201610039772A CN105537750A CN 105537750 A CN105537750 A CN 105537750A CN 201610039772 A CN201610039772 A CN 201610039772A CN 105537750 A CN105537750 A CN 105537750A
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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
- B23K20/02—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating by means of a press ; Diffusion bonding
- B23K20/028—Butt welding
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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
- B23K20/22—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
-
- 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
- B23K37/00—Auxiliary devices or processes, not specially adapted to a procedure covered by only one of the preceding main groups
- B23K37/04—Auxiliary devices or processes, not specially adapted to a procedure covered by only one of the preceding main groups for holding or positioning work
- B23K37/0426—Fixtures for other work
- B23K37/0435—Clamps
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/26—Methods of annealing
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/50—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for welded joints
-
- 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
Abstract
The invention discloses a high-strength connection process for copper-niobium rodlike metals under a non-vacuum low-pressure condition. The high-strength connection process comprises the following steps: (1) pre-treatment for copper rods and niobium rods: carrying out surface grinding, degreasing and cleaning, and then sequentially carrying out etching and ultrasonic cleaning on the connection end surfaces of the niobium rods and the copper rods, and airing; (2) enabling the copper rods and the niobium rods subjected to the above-mentioned pre-treatment to be in coaxial butt joint by a fixture, enabling the connection end surfaces of the copper rods and the niobium rods to be in seamless contact, and axially applying a pressure of 106Mpa; and (3) placing the pressed and fixed copper rods and niobium rods in an annealing furnace, and annealing in a protective atmosphere at an annealing temperature of 950-1050 DEG C, and insulating heat for 2-3h. The connection process disclosed by the invention realizes high-strength metallurgical bonding between the copper-niobium rodlike metals in a manner of atomic diffusion; and high-strength connection can still be realized by using the connection process disclosed by the invention even if the contact areas of junctions are small, thus the mechanical properties at the junctions of the copper-niobium rodlike metals is greatly improved.
Description
Technical field
The invention belongs to a kind of dissimilar metal Joining Technology, particularly relate to the Joining Technology that copper niobium realizes metallurgical binding under antivacuum lower pressure, specifically the high-strength metallurgical of bar-shaped metallic copper and niobium combines.
Background technology
Along with the development of new and high technology, the electronics technology field especially developed rapidly, aerospace field and automotive field etc. all propose requirements at the higher level to material mechanical performance, and existing homogenous material more and more can not meet the needs of prodution and development.Metal niobium, has outstanding combination property in refractory metal: fusing point higher density is minimum, and within the scope of 1093-1427 DEG C, specific strength is the highest, and temperature is low to moderate-200 DEG C and still has good plasticity and processability; Metallic copper, has good heat conduction, electric conductivity and ductility, and therefore copper niobium metal system possesses excellent combination property.But because copper/niobium system is the positive enthalpy of formation (+4KJ/mol), (copper is face-centered cubic for fusing point, density and crystal structure, niobium is body-centered cubic) between all there is greatest differences, be thus difficult to realize copper-niobium high-strength and connect, namely high-strength metallurgical combines.At present, engineering, mainly through after ball-milling method worked copper niobium powder to nanoscale, oozes legal system for copper niobium powder film with infiltration method and pressure, and then obtains high-compactness, the copper niobium composite that electrical and thermal conductivity performance is excellent.
At present, the connection of common dissimilar metal is mainly by welding, mechanical bond and to add and metal or alloy that metal to be connected all dissolves each other realizes as intermediate layer.These connected modes can be divided into two classes: a class is mechanical connection, and such as riveting, is be connected by screw, and this kind of connected mode realizes connecting based on external force, do not spread, i.e. unrealized metallurgical binding between metal; Another kind of is metallurgical connection, such as, weld, and between the interface of two metals, atom realizes due to phase counterdiffusion combining, and this bonding state is that (or under temperature and pressure acting in conjunction) realizes under the independent role of temperature or pressure.Welding procedure comprises ultrasonic bonding, friction stir welding and diffusion welding (DW) etc.Ultrasonic bonding is mainly used in the filament of the non-ferrous metals such as copper, silver, aluminium or sheeting carries out the welding of single-point, multiple spot and short strip shape; Friction stir welding adopts special stirring-head, and key is the relative motion accurately controlling each parts of stirring-head, is mainly used in albronze manufacture.But these class methods are still confined to the alloy system of mutual solid solution at present, and welding point is easily caused to be out of shape and heat affected area local softening.Vacuum diffusion welding, welding surface by material contacts with each other, apply uniform temperature and pressure, by micro-plastic deformation or produce micro-liquid phase and expand the physical contact area of welding surface, make surface to be welded spacing reach 1*10-7-5*10-7mm, be mainly used in the welding of different metal materials, dispersion-strengtherning high temperature alloy, metal-base composites.Although adopt that vacuum diffusion welding can realize that mutual solubility is limited, welding between refractory metal and the foreign material such as nonmetal, its equipment investment is large, and weld interval is long, and it is large that surface prepares effort, and is difficult to the absolute vacuum environment of acquisition.In addition, adopt the metal or alloy all dissolved each other with two kinds of metals to be connected as intermediate layer, utilize intermediate layer to realize being connected with the phase counterdiffusion of two kinds of metals to be connected.Platinum is such as utilized to connect dissimilar metal molybdenum and silver as intermediate layer; Utilize ferrotungsten amorphous as intermediate layer to connect tungsten and tungsten-copper composite material; Or first utilize ball-milling method to make two kinds of metal dusts to be connected reach nano level mixing; then mould is utilized to pressurize; the powder film pressed is sintered under protective atmosphere; thus obtain the film of some strength, using the connection that this film realizes between dissimilar metal as metal intermediate layer to be connected.
Bar-shaped copper niobium realizes can be applicable to non-destructive impulse magnetic field field after high-strength metallurgical combines.This field requires that magnet coiling material (metal wire rod) has high-strength highly-conductive electrical characteristics, utilizes high connductivity characteristic to reduce joule heating effect, utilizes high-strength characteristic to bear huge Lorentz force.
Summary of the invention
For prior art, the invention provides copper niobium bar-shaped metal high strength Joining Technology under a kind of antivacuum lower pressure, realize the high strength bond between bar-shaped metallic copper niobium by the mode of atoms permeating, namely realize the metallurgical binding that copper niobium metal is real.Even when using Joining Technology junction of the present invention contact surface area less, still can realize high strength and connect, thus realize the tremendous increase of bar-shaped metallic copper niobium junction mechanical property.
In order to solve the problems of the technologies described above, copper niobium bar-shaped metal high strength Joining Technology under the antivacuum lower pressure of one that the present invention proposes, to through the copper rod of pre-treatment and niobium rod fixing after, carry out pressurization bonding and annealing in process successively, concrete steps are as follows:
The pre-treatment of step one, copper rod and niobium rod: by smooth for the surface finish of copper rod identical for diameter and niobium rod, connecting end surface is deoiled and cleaning treatment; Respectively the connecting end surface of niobium rod and copper rod is carried out etching and ultrasonic cleaning successively, dry rear stand-by;
Step 2, pressurization are fixing: to be coaxial docking with niobium rod by the copper rod after above-mentioned pre-treatment with fixture and copper rod contacts with the connecting end surface of niobium rod is seamless, the pressure of the 106Mpa that then exerts pressure vertically;
Step 3, bond anneal: pressurizeed by step 2 the fixture copper rod fixed and niobium rod are put into annealing furnace and carried out protective atmosphere annealing, and annealing temperature is 950-1050 DEG C, and temperature retention time is 2-3h.
Further, in step 2, the fixing fixture adopted of pressurization is made up of two pieces of fixed heads, two pieces of division boards and two cover bolt fasteners, and described fixed head adopts molybdenum plate to make, and described division board adopts quartz plate to make; Described two pieces of fixed heads and two pieces of division boards are equipped with two bolt holes, are through on two bolts according to the order of one piece of fixed head, two pieces of division boards and another block fixed head, and screw on nut; When pressurization is fixing, with absolute ethyl alcohol by fixed head and division board surface clean clean, to be positioned between two pieces of division boards according to the position of connecting end surface docking, dead in line through the copper rod of pre-treatment and niobium rod, first rotating nut pretension, the bolt that then screws up with a wrench pressurizes.
Compared with prior art, the invention has the beneficial effects as follows:
The Joining Technology of bar-shaped metallic copper niobium high-strength metallurgical binding is realized under the invention provides a kind of antivacuum lower pressure, by strictly processing the surface of measure-alike bar-shaped fine copper and bar-shaped pure niobium, and accurately control external pressure and annealing temperature, even if pressure meets the numerical value being conducive to realizing bar-shaped fine copper and being effectively connected with bar-shaped pure niobium, annealing temperature meet close to and lower than the numerical value of system low-melting-point metal copper fusing point, ensure that low-melting-point metal is in semi-molten state, by this mode, the diffusion successfully achieving copper and niobium two kinds of metals is connected.
The present invention does not rely on adding of the third metal, and do not belong to pseudo-alloy, directly realize metallic copper by the annealing process that simply pressurizes to be connected with the high strength of niobium, this technique is not only applicable to copper/niobium system, be equally applicable to other dissimilar metal systems that character difference is larger, break the current limitation utilizing conventional method to prepare nanosized copper niobium composite, utilize novel thermal process technique to realize bar-shaped copper-niobium high-strength to connect, for such system connection from now on provides certain theoretical foundation, and be applicable to the manufacture of high strength boundling copper niobium wire rod completely.Tested by tension test, the bond strength of bar-shaped metallic copper and bar-shaped metal niobium, up to 101.1MPa, meets modern non-pulse high-intensity magnetic field field completely to the high request of material.
Accompanying drawing explanation
Fig. 1 is the fixing schematic diagram of sample pressurization in the present invention, in figure: 1-fixed head, and 2-division board, 3-niobium rod, 4-copper rod, 5-bolt, 6-nut;
Fig. 2 is bond anneal process curve figure in Joining Technology of the present invention;
Fig. 3 is copper rod and niobium rod bonding bonding strength test stress strain curve figure;
Fig. 4 (a) is that in the excellent combination interface of copper rod and niobium, copper rod connecting end surface pattern SEM schemes;
Fig. 4 (b) is that the partial enlargement pattern SEM in Fig. 4 (a) schemes;
Fig. 5 (a) is that the local pattern SEM in Fig. 4 (a) schemes;
Fig. 5 (b) is square frame corresponding position composition power spectrum (EDS) analysis chart in Fig. 5 (a);
Fig. 6 is niobium rod connecting end surface pattern SEM figure in the excellent combination interface of copper rod and niobium.
Detailed description of the invention
Be described in further detail technical solution of the present invention below in conjunction with the drawings and specific embodiments, described specific embodiment only explains the present invention, not in order to limit the present invention.
The invention provides copper niobium bar-shaped metal high strength Joining Technology under a kind of antivacuum lower pressure, to through the copper rod of pre-treatment and niobium rod fixing after, carry out pressurization bonding and annealing in process successively, concrete steps are as follows:
The pre-treatment of step one, copper rod and niobium rod:
Surface finish:
Diameter 10 ㎜ will be of a size of, the niobium rod (purity >=99.98%) of high 30 ㎜ and be of a size of diameter 10 ㎜, the copper rod (purity >=99.98%) of high 30 ㎜ uses sand paper process, namely first with the sand paper of 240#, one end face of niobium rod is polished to smooth, no concave-convex face, next, successively by 600#, 800#, 1500# and 2000# sand paper is polished to this end face, often change a sand paper, polishing direction rotates 90 DEG C, polish each time, process is all needed to disappear completely to last polishing vestige, final niobium plane rod end only leaves the polishing vestige of 2000# sand paper, with absolute ethyl alcohol, surface cleaning is clean, obtain smooth contact surface (i.e. the connecting end surface of follow-up bonding).The connecting end surface processing method of copper rod is the same.
Deoil and etching processing in surface:
Deoil liquid, the organic solvent namely configured as required or alkaline solution, for removing metal surface greasy dirt.The configuration of liquid of deoiling in the present embodiment is: the concentrated hydrochloric acid (mass percent is 37%) getting 50ml slowly adds in 900ml deionized water, get the 50ml concentrated sulfuric acid (mass percent is 98%) after stirring again slowly to add, stir, be configured to the degreasing solution of 1L.
Etching, being by chemical, physics or use chemistry and physics simultaneously method, selectively not removed by that a part of thin layer that resist is sheltered, thus obtaining on film and on all four figure on resist film.Etching liquid, namely configure as required not removed by the thin layer that resist is sheltered, thus on film, obtain the solution of figure identical with resist film.The configuration of etching liquid in the present embodiment: get 700ml deionized water and pour in beaker, weigh the concentrated hydrochloric acid (mass percent is 37%) of 150ml again, slowly join in deionized water, the last concentrated sulfuric acid (mass percent is 98%) slowly adding 150ml, slowly stir in adition process, prevent beaker solution overheated.Pour in solution with electronic balance weighing 80g chromic anhydride and stir until dissolve the etching solution being namely configured to 1L completely.
Deoil and etching process in surface: the surface treatment surface (especially connecting end surface) of the copper rod of sand paper process and niobium rod being carried out wipe oil and impurity.Surface treatment is connected extremely important for acquisition copper rod with the high strength of niobium rod.
The surface treatment of niobium rod comprise deoil, clean, etch, the step such as Ultrasonic Cleaning, detailed process is: immersed in the liquid that deoils by the niobium plane rod end crossed with washes of absolute alcohol and soak 2 minutes, then take out and put into deionized water soaking and washing, the niobium rod cleaned deoiling again immerses in etching liquid and etches, etching terminates to clean in rear immersion deionized water, then put into deionized water and carry out Ultrasonic Cleaning, dry stand-by after ultrasonic cleaning; Copper rod surface treatment is the same, dries stand-by.
Step 2, pressurization are fixed:
With fixture the copper rod after above-mentioned pre-treatment to be coaxial docking with niobium rod and copper rod contacts with the connecting end surface of niobium rod is seamless, the pressure of the 106Mpa that then exerts pressure vertically.
In the present invention, the mentality of designing of pressurization holding clamp used is, adopt fixed plate structure, its size and intensity will meet the object that can make copper rod and niobium rod uniform stressed, and the material fusing point of the fixed head used must be greater than the annealing temperature in follow-up bonding annealing steps, and using a division board will be connected metal bar and fixed head is isolated, the material that division board adopts must ensure not react with fixed head, copper rod and niobium rod.Therefore, the present invention pressurize fixing adopted fixture structure as shown in Figure 1, this pressurization stationary fixture is made up of two pieces of fixed heads, 1, two pieces of division boards 2 and two cover bolt fasteners,
Described fixed head 1 adopts molybdenum plate to make, and described division board 2 adopts quartz plate to make; Described two pieces of fixed heads 1 and two pieces of division boards 2 are equipped with two bolt holes, get the molybdenum plate being of a size of 45 × 20 × 3 ㎜, molybdenum plate central area needs the one end of copper rod and the niobium rod connected for placing, distance molybdenum plate laterally (long side direction) back gauge is that 5mm respectively processes one for the through hole through M3 bolt, on molybdenum plate, the line of centres of two through holes and molybdenum plate Central Symmetry point are on same straight line, and this straight line is parallel with the long limit on molybdenum plate.During use, be through on two bolts 5 according to the order of one piece of fixed head, 1, two pieces of division boards 2 and another block fixed head 1, and screw on nut 6, when pressurization is fixing, with absolute ethyl alcohol by clean for the surface clean of fixed head 1 and division board 2, by through the copper rod 4 of pre-treatment and 3 deads in line of niobium rod, and make that both are smoothly connected the seamless complete docking of end face, untreated other end on copper rod 4 and niobium rod 3 is placed a division board 2 and fixed head 1 respectively, (be about to be positioned between two pieces of division boards 2 to the copper rod 4 connected and niobium rod 3, two pieces of fixed heads 1 overlay the outside of every block division board 2 respectively, fixed head 1 and division board 2 is each passed through with the bolt 5 of two same specifications, screw on the first pretension of nut 6, after basicly stable, to tight a bolt 5 pressurizations with a torque wrench again, moment of torsion is set to 10Nm, namely along the pressure of the axial pressure 106Mpa of bolt 5.
Step 3, bond anneal:
Pressurizeed by the step 2 fixture copper rod fixed and niobium rod sample (sample is now in pressurization jig) is together put into annealing furnace together with fixture and is carried out protective atmosphere annealing, and parameter and annealing is set as that 980 DEG C of hydrogen atmospheres are annealed 3 hours.Annealing process, as shown in Figure 2: be warming up to 250 DEG C with the speed of 5 DEG C/min, at 250 DEG C of insulation 10min, be warming up to 500 DEG C with the speed of 5 DEG C/min subsequently, at 500 DEG C of insulation 10min, then 980 DEG C are directly warming up to the speed of 5 DEG C/min, 980 DEG C of insulations 3 hours, with stove cool to room temperature after insulation terminates, remove pressurization jig, take out sample, copper rod and the niobium rod of high strength connection can be obtained.In above-mentioned annealing process, annealing temperature is arranged on 980 DEG C, this temperature be close to and lower than the fusing point of the mutual not system solid solution low-melting-point metal copper of copper niobium.
Bar-shaped copper niobium connects cross section copper end face SEM to be tested, as shown in Fig. 4 (a) He Fig. 4 (b), the vestige that the connecting end surface of copper rod has obvious annealed tensile and tears clearly can be found out from Fig. 4 (a), and surface does not have obvious pit, the tab area that in Fig. 4 (b), curve surrounds is that the place in Fig. 4 (a) is protruding, test as niobium through EDS, illustrate in drawing process, stable the staying on copper rod of the niobium broken.
Bar-shaped copper niobium connector copper end face appointed area composition Auger electron spectroscopy is analyzed, as shown in Fig. 5 (a) He Fig. 5 (b), wherein, Fig. 5 (a) is that copper end face SEM schemes, Fig. 5 (b) is the energy spectrum analysis to boxed area in Fig. 5 (a), and table 1 is the result to Fig. 5 (b) energy spectrum analysis.Result shows, copper end face appointed area element is niobium and copper, shows that niobium constantly spreads in copper through pressurization annealing, to such an extent as to has the existence of niobium on copper surface.
Table 1
After stretching, niobium end face SEM tests, and as shown in Figure 6, obviously can see the existence (region of closed curve mark) of certain area pit, be a part of niobium to copper diffusion in Fig. 4 (b) in end.
The bar-shaped copper niobium connecting part stretching strength test that the present embodiment obtains.Extension test is carried out at electronic universal tester (model C SS-44100).Draw speed 1mm/min is to bar-shaped copper niobium fracture, and record now maximum load, stress strain curve is shown in Fig. 3.Area of fracture is calculated with Image-ProPlus (MediaCybernetics company of U.S. image analysis software), maximum load is divided by port area, i.e. bar-shaped fine copper and bar-shaped pure niobium bonding strength, result is as shown in table 2, and bonding strength meets instructions for use.
Table 2
| Maximum load/N | Area of fracture/mm2 | Bond strength/MPa |
| 3185.5 | 31.5 | 101.1 |
Although invention has been described for composition graphs above; but the present invention is not limited to above-mentioned detailed description of the invention; above-mentioned detailed description of the invention is only schematic; instead of it is restrictive; those of ordinary skill in the art is under enlightenment of the present invention; when not departing from present inventive concept, can also make a lot of distortion, these all belong within protection of the present invention.
Claims (2)
1. a copper niobium bar-shaped metal high strength Joining Technology under antivacuum lower pressure, to through the copper rod of pre-treatment and niobium rod fixing after, carry out pressurization bonding and annealing in process successively, it is characterized in that: concrete steps are as follows:
The pre-treatment of step one, copper rod and niobium rod: by smooth for the surface finish of copper rod identical for diameter and niobium rod, connecting end surface is deoiled and cleaning treatment; Respectively the connecting end surface of niobium rod and copper rod is carried out etching and ultrasonic cleaning successively, dry rear stand-by;
Step 2, pressurization are fixing: to be coaxial docking with niobium rod by the copper rod after above-mentioned pre-treatment with fixture and copper rod contacts with the connecting end surface of niobium rod is seamless, the pressure of the 106Mpa that then exerts pressure vertically;
Step 3, bond anneal: pressurizeed by step 2 the fixture copper rod fixed and niobium rod are put into annealing furnace and carried out protective atmosphere annealing, and annealing temperature is 950-1050 DEG C, and temperature retention time is 2-3h.
2. copper niobium bar-shaped metal high strength Joining Technology under antivacuum lower pressure according to claim 1, it is characterized in that: in step 2, the fixing fixture adopted of pressurization is made up of two pieces of fixed heads, two pieces of division boards and two cover bolt fasteners, described fixed head adopts molybdenum plate to make, and described division board adopts quartz plate to make; Described two pieces of fixed heads and two pieces of division boards are equipped with two bolt holes, are through on two bolts according to the order of one piece of fixed head, two pieces of division boards and another block fixed head, and screw on nut; When pressurization is fixing, with absolute ethyl alcohol by fixed head and division board surface clean clean, to be positioned between two pieces of division boards according to the position of connecting end surface docking, dead in line through the copper rod of pre-treatment and niobium rod, first rotating nut pretension, the bolt that then screws up with a wrench pressurizes.
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Cited By (3)
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| CN107398630A (en) * | 2017-06-26 | 2017-11-28 | 天津大学 | The high intensity of tungsten and copper is directly connected to technique |
| CN108709804A (en) * | 2018-06-22 | 2018-10-26 | 华南理工大学 | A kind of device and its test method for lignin tension test |
| CN116539524A (en) * | 2023-07-07 | 2023-08-04 | 成都飞机工业（集团）有限责任公司 | System for testing adhesive force by single-sided pulling-out method and application method thereof |
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| 《电子工业技术词典》编辑委员会: "《电子工业技术词典 电子管》", 30 June 1977 * |
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| CN107398630B (en) * | 2017-06-26 | 2019-11-12 | 天津大学 | The high intensity of tungsten and copper is directly connected to technique |
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