CN102218594A - Low-temperature diffusion welding method for molybdenum alloy and copper alloy - Google Patents

Low-temperature diffusion welding method for molybdenum alloy and copper alloy Download PDF

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Publication number
CN102218594A
CN102218594A CN2011101720044A CN201110172004A CN102218594A CN 102218594 A CN102218594 A CN 102218594A CN 2011101720044 A CN2011101720044 A CN 2011101720044A CN 201110172004 A CN201110172004 A CN 201110172004A CN 102218594 A CN102218594 A CN 102218594A
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welding
alloy
molybdenum
molybdenum alloy
workpiece
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沈强
张建
罗国强
李美娟
张联盟
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Wuhan University of Technology WUT
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Wuhan University of Technology WUT
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Abstract

The invention relates to a low-temperature diffusion welding method for a molybdenum alloy and a copper alloy. The method comprises the following steps of: 1, cleaning the surface of a workpiece, namely processing a molybdenum alloy plate and a copper alloy plate to a given size, and removing oxide layers from surfaces to be welded of the molybdenum alloy plate and the copper alloy plate; 2, assembling the workpiece, namely placing nickel foils serving as an intermediate layer between the molybdenum alloy plate and the copper alloy plate, respectively spraying a layer of solder mask on an upper press head and a lower press head of a mold, and building a welded workpiece; and 3, clamping the welded workpiece, introducing the welded workpiece to a furnace and welding, namely placing the welded workpiece in a vacuum diffusion welding furnace, heating, preserving heat, applying axial pressure to the welded workpiece before heat preservation, and relieving the pressure after heat preservation. By the method, high-quality welding between the molybdenum alloy and the copper alloy can be realized; moreover, the method is applicable for reliable welding between different-type molybdenum alloy and the copper alloy and particularly applied to welding between a molybdenum-alloy thin plate and a copper-alloy thin plate, is simple in operation and low in cost and ensures good planarity of a welding product. The tensile strength of a welding joint reaches 97MPa.

Description

The low-temperature diffusion welding method of molybdenum alloy and copper alloy
Technical field
The present invention relates to the diffusion welding method of different alloys, be specifically related to the welding method of a kind of molybdenum alloy and copper alloy, be particularly suitable for the low temperature diffusion welding of molybdenum alloy and copper alloy.
Background technology
Molybdenum is a kind of refractory metal, and the high temperature specific strength is big, and linear expansion coefficient is little, Heat stability is good, and electric conductivity, thermal conductivity are good, are usually used among height, the new science and technology field.Copper alloy has good electric conductivity, thermal conductivity, corrosion resistance, ductility and certain intensity, has obtained to use widely in industry such as electric, electronics, chemical industry, traffic and space flight, weapons.Molybdenum-copper is compared with tungsten-copper, and quality is little, and processing is easier to, and its linear expansion coefficient, thermal conductivity factor and some main mechanical properties are suitable with tungsten-copper; Though its heat resistance is not as good as tungsten-copper,, can make the preceding hot baffle of RV because of its heat resistance and enough elevated temperature strengths than some heat proof materials are good at present.Molybdenum-copper is non-magnetic, for not only requiring the linear expansion coefficient coupling but also requiring the device of no magnetic, is applied as vibrating wire pressure sensor, magnetron, low-noise traveling-wave tube etc.Therefore, realize the high-quality welding of molybdenum alloy and copper alloy, not only have learning value, open up practicable road for relevant industrial production especially.
Diffusion Welding is a kind of of pressure welding, belongs to solid-state welding technology, can realize the welding of the unweldable foreign material of fusion welding method, is specially adapted to the welding of dissimilar metal and alloy.
The technical difficulty of molybdenum and copper heterogenous metal welding is very big, because liquid copper and molybdenum can not dissolve each other, is difficult for obtaining satisfied welding point during therefore with fusion welding method soldering copper and molybdenum.And copper and molybdenum fusing point differ greatly, and linear expansion coefficient differs greatly, and chemical composition has very big difference, have a strong impact on the performance of welding point.
Summary of the invention
Technical problem to be solved by this invention is: the low-temperature diffusion welding method that a kind of molybdenum alloy and copper alloy are provided, adopt the vacuum diffusion welding connection technology, add nickel foil and do the intermediate layer, realize reliable connection the between molybdenum alloy and the copper alloy, be specially adapted to the Diffusion Welding of molybdenum alloy light sheet and copper alloy thin plate.
The present invention solves its technical problem and adopts following technical scheme:
The low-temperature diffusion welding method of molybdenum alloy provided by the invention and copper alloy specifically is to adopt the method that may further comprise the steps:
(1) surface of the work cleanup step:
The mechanical means of employing flat stone mill is worked into molybdenum alloy sheet, alcu alloy film the physical dimension of regulation, the depth of parallelism after the processing is better than 0.05mm, polish smooth step by step with sand paper, remove oxide layer, deposit with changing in the acetone or alcohol behind acetone or alcohol ultrasonic cleaning 1~10min;
(2) workpiece number of assembling steps:
According to order assembling from bottom to top, ceramic coated solder mask on the mould push-down head, alcu alloy film is positioned on the ceramic solder mask, place nickel foil then, on nickel foil, place the molybdenum alloy sheet, having sprayed the ceramic solder mask of welding resistance effect on the mould seaming chuck, up is the mould seaming chuck, forms the workpiece that assembles;
(3) workpiece is installed into the stove welding step:
Be placed on above the push-down head of vacuum pressure welding machine after the workpiece that assembles put die coat, place vacuum diffusion welding to connect between the seaming chuck and push-down head in the stove, close door for vacuum chamber, vacuumize; When vacuum is better than 1.0 * 10 -2During Pa, begin heating, be heated to 730 ℃~850 ℃, insulation 10min~60min implements vacuum diffusion welding and connects; Before the insulation beginning welded part is applied the 5MPa axial compressive force, insulation finishes afterwards removal pressure fully; Workpiece is taken out in stove cooling back;
Through after the above-mentioned steps, realize to workpiece being the low temperature diffusion welding of molybdenum alloy and copper alloy.
Described molybdenum alloy sheet can be Mo1 molybdenum alloy or Mo2 molybdenum alloy.
Described alcu alloy film can be oxygen-free copper or brass or bronze.
Described nickel foil can be N2, N4 or N6 nickel foil, and thickness is 10 ~ 30 μ m.
In the vacuum diffusion welding termination process, during heating, the heating rate by 5 ℃~10 ℃/min is warming up to 630 ℃~750 ℃ earlier, and the heating rate with 2 ℃~5 ℃/min is warming up to 730 ℃~850 ℃ then.
The present invention compared with prior art has following main advantage:
1. the method for utilizing vacuum diffusion welding to connect has realized the reliable welding of molybdenum alloy and copper alloy, characteristics are to add nickel foil to do the intermediate layer, under high vacuum, heat, under the effect of welding pressure, make molybdenum and copper surface that plastic deformation takes place, realize the phase counterdiffusion combination between the atom, form molybdenum-nickel-copper diffusion jointing.Nickel and copper infinitely dissolve each other, and nickel and molybdenum can limitedly dissolve each other, so can form the bigger welding point of intensity; Nickel has good plasticity, and yield limit is lower, and therefore thermal coefficient of expansion can effectively alleviate the joint internal stress between molybdenum and copper, and welding point tensile strength reaches 97MPa, is higher than direct diffusion welding strength.
2. utilize preparation method of the present invention, the high strength that can realize multiple molybdenum, copper alloy connects, flatness is better than 0.05mm, the depth of parallelism is better than 0.1mm, fracture connects closely, the weldment flatness is good, and the joint tensile strength of Diffusion Welding joint reaches 97MPa, is specially adapted to the welding of molybdenum alloy light sheet and copper alloy thin plate.
3. easy and simple to handle, cost is low, applicability is strong, easy to utilize.
Description of drawings
Fig. 1 is the schematic diagram of the low temperature diffusion welding procedure of molybdenum alloy of the present invention and copper alloy.
Fig. 2 be the present invention 800 ℃ of welding temperatures, temperature retention time 30min, the microstructure of the linkage interface of Diffusion Welding molybdenum alloy and copper alloy under the welding pressure 5MPa.
Fig. 3 is line sweep figure shown in Figure 2.
Fig. 4 is that Mo1 molybdenum alloy sheet of the present invention and oxygen-free copper interpolation N2 nickel foil Diffusion Welding joint tensile strength vary with temperature graph of a relation.
Fig. 5 is that the present invention assembles schematic diagram.
Among the figure: the 1.WC seaming chuck; 2. molybdenum alloy sheet; 3. nickel foil; 4. alcu alloy film; 5. ceramic solder mask; 6.WC push-down head; 7. vacuum press welder seaming chuck; 8. vacuum press welder push-down head; 9.WC overcoat.
The specific embodiment
The invention will be further described below in conjunction with embodiment and accompanying drawing, but be not limited to following described content.
Embodiment 1:
The molybdenum alloy sheet spread with alcu alloy film be connected, wherein: the molybdenum alloy sheet is a Mo1 molybdenum alloy sheet, and alcu alloy film is the anaerobic copper sheet.The diffusion connecting process condition is: 800 ℃ of welding temperatures, temperature retention time 30min, welding pressure 5MPa.
Referring to Fig. 1: it is as follows that molybdenum alloy sheet 2 and alcu alloy film 4 are spread the concrete steps that are connected:
1. prepare before the weldering:
Intermediate layer material is the N2 nickel foil of thick 10 μ m, with acetone soln ultrasonic cleaning 10min.With surface grinding machine molybdenum alloy sheet and alcu alloy film are processed the thin slice that the depth of parallelism is better than 0.05mm, with to be welded of 1000#, 1200# and 05, No. 06 abrasive paper for metallograph polishing circle sheet, use acetone soln ultrasonic cleaning 10min before the weldering.
2. according to order assembling from bottom to top:
Ceramic coated solder mask 5 on mould push-down head 6 is placed alcu alloy film 4, nickel foil 3, molybdenum alloy sheet 2 successively, and ceramic coated solder mask 5 on mould seaming chuck 1 up is a mould seaming chuck 1, forms the workpiece that assembles.
3. workpiece is installed and welds into stove:
Workpiece is put between the seaming chuck 7 of the push-down head 8 that is placed on the vacuum pressure welding machine behind the die coat and vacuum press welder.Be better than 1.0 * 10 in vacuum then -2Under the condition of Pa, welded piece is heated up; Heating rate by 10 ℃/min is warming up to 700 ℃, rises to 750 ℃ with 5 ℃/min then, rises to 800 ℃ with 2 ℃/min again, and insulation 30min applies the 5MPa axial compressive force when temperature rises to 750 ℃, complete removal pressure after insulation finishes; With the stove cooling, take out molybdenum alloy sheet 2 and alcu alloy film 4 after diffusion connects.
By Fig. 2 and Fig. 3 as can be known: molybdenum alloy sheet 2/ alcu alloy film 4 that obtains is in conjunction with closely, and the counterdiffusion of element phase is abundant.
As shown in Figure 4: molybdenum alloy sheet 2/ alcu alloy film 4 that obtains is in conjunction with tight, and joint tensile strength reaches 97MPa.
Embodiment 2:
The molybdenum alloy sheet spread with alcu alloy film be connected, wherein: the molybdenum alloy sheet is a Mo1 molybdenum alloy sheet, and alcu alloy film is the anaerobic copper sheet.The diffusion connecting process condition is: 850 ℃ of welding temperatures, temperature retention time 30min, welding pressure 5MPa.
It is as follows that molybdenum alloy sheet 2 and alcu alloy film 4 are spread the concrete steps that are connected:
1. prepare before the weldering:
Intermediate layer material is the N4 nickel foil of thick 20 μ m, with acetone soln ultrasonic cleaning 10min.With surface grinding machine molybdenum alloy sheet and alcu alloy film are processed the thin slice that the depth of parallelism is better than 0.05mm, with to be welded of 1000#, 1200# and 05, No. 06 abrasive paper for metallograph polishing circle sheet, use acetone soln ultrasonic cleaning 10min before the weldering.
2. according to order assembling from bottom to top:
Ceramic coated solder mask 5 on mould push-down head 6 is placed alcu alloy film 4, nickel foil 3, molybdenum alloy sheet 2 successively, and ceramic coated solder mask 5 on mould seaming chuck 1 up is a mould seaming chuck 1, forms the workpiece that assembles.
3. workpiece is installed and welds into stove:
Workpiece is put between the seaming chuck 7 of the push-down head 8 that is placed on the vacuum pressure welding machine behind the die coat and vacuum press welder.Be better than 1.0 * 10 in vacuum then -2Under the condition of Pa, welded piece is heated up; Heating rate by 10 ℃/min is warming up to 750 ℃, rises to 800 ℃ with 5 ℃/min then, rises to 850 ℃ with 2 ℃/min again, and insulation 30min applies the 5MPa axial compressive force when temperature rises to 800 ℃, complete removal pressure after insulation finishes; Cool off with stove.The molybdenum that obtains/copper sheet is in conjunction with tight, and collimation is good, and joint tensile strength reaches 42MPa.
Embodiment 3:
The molybdenum alloy sheet spread with alcu alloy film be connected, wherein: the molybdenum alloy sheet is a Mo2 molybdenum alloy sheet, and alcu alloy film is a latten(-tin).The diffusion connecting process condition is: 730 ℃ of welding temperatures, temperature retention time 60min, welding pressure 5MPa.
It is as follows that molybdenum alloy sheet 2 and alcu alloy film 4 are spread the concrete steps that are connected:
1. prepare before the weldering:
Intermediate layer material is the N6 nickel foil of thick 30 μ m, with acetone soln ultrasonic cleaning 10min.With molybdenum alloy sheet and alcu alloy film acetone soln ultrasonic cleaning 10min.With surface grinding machine molybdenum alloy sheet and alcu alloy film are processed the thin slice that the depth of parallelism is better than 0.05mm, with to be welded of 1000#, 1200# and 05, No. 06 abrasive paper for metallograph polishing circle sheet, use acetone soln ultrasonic cleaning 10min before the weldering.
2. according to order assembling from bottom to top:
Ceramic coated solder mask 5 on mould push-down head 6 is placed alcu alloy film 4, nickel foil 3, molybdenum alloy sheet 2 successively, and ceramic coated solder mask 5 on mould seaming chuck 1 up is a mould seaming chuck 1, forms the workpiece that assembles.
3. workpiece is installed and welds into stove:
Workpiece is put between the seaming chuck 7 of the push-down head 8 that is placed on the vacuum pressure welding machine behind the die coat and vacuum press welder.Be better than 1.0 * 10 in vacuum then -2Under the condition of Pa, welded piece is heated up; Heating rate by 10 ℃/min is warming up to 630 ℃, rises to 680 ℃ with 5 ℃/min then, rises to 730 ℃ with 2 ℃/min again, and insulation 60min applies the 5MPa axial compressive force when temperature rises to 800 ℃, complete removal pressure after insulation finishes; Cool off with stove.The molybdenum that obtains/copper sheet is in conjunction with tight, and collimation is good, and joint tensile strength reaches 66MPa.
Embodiment 4:
The molybdenum alloy sheet spread with alcu alloy film be connected, wherein: the molybdenum alloy sheet is a Mo1 molybdenum alloy sheet, and alcu alloy film is a latten(-tin).The diffusion connecting process condition is: 750 ℃ of welding temperatures, temperature retention time 40min, welding pressure 5MPa.
It is as follows that molybdenum alloy sheet 2 and alcu alloy film 4 are spread the concrete steps that are connected:
1. prepare before the weldering:
Intermediate layer material is the N2 nickel foil of thick 15 μ m, with acetone soln ultrasonic cleaning 10min.With surface grinding machine molybdenum alloy sheet and alcu alloy film are processed the thin slice that the depth of parallelism is better than 0.05mm, with to be welded of 1000#, 1200# and 05, No. 06 abrasive paper for metallograph polishing circle sheet, use acetone soln ultrasonic cleaning 10min before the weldering.
2. according to order assembling from bottom to top:
Ceramic coated solder mask 5 on mould push-down head 6 is placed alcu alloy film 4, nickel foil 3, molybdenum alloy sheet 2 successively, and ceramic coated solder mask 5 on mould seaming chuck 1 up is a mould seaming chuck 1, forms the workpiece that assembles.
3. workpiece is installed and welds into stove:
Workpiece is put between the seaming chuck 7 of the push-down head 8 that is placed on the vacuum pressure welding machine behind the die coat and vacuum press welder.Be better than 1.0 * 10 in vacuum then -2Under the condition of Pa, welded piece is heated up; Heating rate by 10 ℃/min is warming up to 650 ℃, rises to 700 ℃ with 5 ℃/min then, rises to 750 ℃ with 2 ℃/min again, and insulation 40min applies the 5MPa axial compressive force when temperature rises to 750 ℃, complete removal pressure after insulation finishes; Cool off with stove.The molybdenum that obtains/copper sheet is in conjunction with tight, and collimation is good, and joint tensile strength reaches 70MPa.
Embodiment 5:
The molybdenum alloy sheet spread with alcu alloy film be connected, wherein: molybdenum alloy is a Mo2 molybdenum alloy sheet, and alcu alloy film is a bronze flake.The diffusion connecting process condition is: 830 ℃ of welding temperatures, temperature retention time 10min, welding pressure 5MPa.
It is as follows that molybdenum alloy sheet 2 and alcu alloy film 4 are spread the concrete steps that are connected:
1. prepare before the weldering:
Intermediate layer material is the N6 nickel foil 3 of thick 30 μ m, with acetone soln ultrasonic cleaning 10min.With surface grinding machine molybdenum alloy sheet and alcu alloy film are processed the thin slice that the depth of parallelism is better than 0.05mm, with to be welded of 1000#, 1200# and 05, No. 06 abrasive paper for metallograph polishing circle sheet, use acetone soln ultrasonic cleaning 10min before the weldering.
2. according to order assembling from bottom to top:
Ceramic coated solder mask 5 on mould push-down head 6 is placed alcu alloy film 4, nickel foil 3, molybdenum alloy sheet 2 successively, and ceramic coated solder mask 5 on mould seaming chuck 1 up is a mould seaming chuck 1, forms the workpiece that assembles.
3. workpiece is installed and welds into stove:
Workpiece is put between the seaming chuck 7 of the push-down head 8 that is placed on the vacuum pressure welding machine behind the die coat and vacuum press welder.Be better than 1.0 * 10 in vacuum then -2Under the condition of Pa, welded piece is heated up; Heating rate by 10 ℃/min is warming up to 730 ℃, rises to 780 ℃ with 5 ℃/min then, rises to 830 ℃ with 2 ℃/min again, and insulation 10min applies the 5MPa axial compressive force when temperature rises to 830 ℃, complete removal pressure after insulation finishes; Cool off with stove.The molybdenum that obtains/copper sheet is in conjunction with tight, and collimation is good, and joint tensile strength reaches 62MPa.
In the foregoing description, similar among described Fig. 1, Fig. 2, Fig. 3, Fig. 4 and the embodiment 1.
In the foregoing description, described acetone can be replaced by ethanol.
In the foregoing description, described ceramic solder mask BN pottery solder mask.
In the foregoing description, described assembling schematic diagram is made up of WC seaming chuck 1, WC push-down head 6, WC overcoat 9 as shown in Figure 5, and wherein: will treat that weldment places between WC seaming chuck 1, the WC push-down head 6, the described weldment for the treatment of is alcu alloy film 4, nickel foil 3 and molybdenum alloy sheet 2.The periphery of described WC seaming chuck 1, WC push-down head 6 is entangled by a WC overcoat 9 respectively, treats the weldment alignment with assurance, and contact closely.

Claims (5)

1. the low-temperature diffusion welding method of molybdenum alloy and copper alloy is characterized in that adopting the method that may further comprise the steps:
(1) surface of the work cleanup step:
The mechanical means of employing flat stone mill is worked into molybdenum alloy sheet, alcu alloy film the physical dimension of regulation, the depth of parallelism after the processing is better than 0.05mm, polish smooth step by step with sand paper, remove oxide layer, deposit with changing in the acetone or alcohol behind acetone or alcohol ultrasonic cleaning 1~10min;
(2) workpiece number of assembling steps:
According to order assembling from bottom to top, ceramic coated solder mask on the mould push-down head, alcu alloy film is positioned on the ceramic solder mask, place nickel foil then, on nickel foil, place the molybdenum alloy sheet, having sprayed the ceramic solder mask of welding resistance effect on the mould seaming chuck, up is the mould seaming chuck, forms the workpiece that assembles;
(3) workpiece is installed into the stove welding step:
Be placed on above the push-down head of vacuum pressure welding machine after the workpiece that assembles put die coat, place vacuum diffusion welding to connect between the seaming chuck and push-down head in the stove, close door for vacuum chamber, vacuumize; When vacuum is better than 1.0 * 10-2Pa, begin heating, be heated to 730 ℃~850 ℃, insulation 10min~60min implements vacuum diffusion welding and connects; Before the insulation beginning welded part is applied the 5MPa axial compressive force, insulation finishes afterwards removal pressure fully; Workpiece is taken out in stove cooling back;
Through after the above-mentioned steps, realize to workpiece being the low temperature diffusion welding of molybdenum alloy and copper alloy.
2. the low-temperature diffusion welding method of molybdenum alloy as claimed in claim 1 and copper alloy is characterized in that: described molybdenum alloy sheet is Mo1 molybdenum alloy or Mo2 molybdenum alloy.
3. the low-temperature diffusion welding method of molybdenum alloy as claimed in claim 1 and copper alloy is characterized in that: described alcu alloy film is oxygen-free copper or brass or bronze.
4. the low-temperature diffusion welding method of molybdenum alloy as claimed in claim 1 and copper alloy is characterized in that: described nickel foil is N2, N4 or N6 nickel foil, and thickness is 10 ~ 30 μ m.
5. the low-temperature diffusion welding method of molybdenum alloy as claimed in claim 1 and copper alloy, it is characterized in that: in the vacuum diffusion welding termination process, during heating, heating rate by 5 ℃~10 ℃/min is warming up to 630 ℃~750 ℃ earlier, and the heating rate with 2 ℃~5 ℃/min is warming up to 730 ℃~850 ℃ then.
CN2011101720044A 2011-06-24 2011-06-24 Low-temperature diffusion welding method for molybdenum alloy and copper alloy Pending CN102218594A (en)

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CN103817451A (en) * 2014-03-13 2014-05-28 中国科学院电子学研究所 Oxygen-free copper composite welding method
CN104096961A (en) * 2014-07-10 2014-10-15 西北工业大学 Low-temperature diffusion bonding method for red copper
CN104404505A (en) * 2014-11-25 2015-03-11 开封大学 Spraying preparation method for Cu/Mo/Cu composite thin plate
WO2015085650A1 (en) * 2013-12-12 2015-06-18 有研亿金新材料有限公司 Method for diffusion welding w-ti alloy target material assembly
CN108287093A (en) * 2018-01-19 2018-07-17 李佳若 A kind of cupro-nickel combination process
CN109604804A (en) * 2018-12-18 2019-04-12 哈尔滨工业大学(威海) A kind of connector and the connection method of copper and niobium
CN109604803A (en) * 2018-12-07 2019-04-12 上海空间推进研究所 A kind of diffusion welding method for propulsion subsystem engine head
CN109628798A (en) * 2019-01-21 2019-04-16 苏州东方模具科技股份有限公司 Glass mold bimetallic mouth mold and preparation method thereof
CN110026633A (en) * 2019-04-04 2019-07-19 河北躬责科技有限公司 A kind of microchannel heat sink and welding method

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WO2015085650A1 (en) * 2013-12-12 2015-06-18 有研亿金新材料有限公司 Method for diffusion welding w-ti alloy target material assembly
CN103817451A (en) * 2014-03-13 2014-05-28 中国科学院电子学研究所 Oxygen-free copper composite welding method
CN103817451B (en) * 2014-03-13 2016-04-13 中国科学院电子学研究所 Oxygen-free copper complex welding method
CN104096961A (en) * 2014-07-10 2014-10-15 西北工业大学 Low-temperature diffusion bonding method for red copper
CN104404505A (en) * 2014-11-25 2015-03-11 开封大学 Spraying preparation method for Cu/Mo/Cu composite thin plate
CN104404505B (en) * 2014-11-25 2015-08-26 开封大学 The spraying preparation method of Cu/Mo/Cu composite sheet
CN108287093A (en) * 2018-01-19 2018-07-17 李佳若 A kind of cupro-nickel combination process
CN109604803A (en) * 2018-12-07 2019-04-12 上海空间推进研究所 A kind of diffusion welding method for propulsion subsystem engine head
CN109604804A (en) * 2018-12-18 2019-04-12 哈尔滨工业大学(威海) A kind of connector and the connection method of copper and niobium
CN109628798A (en) * 2019-01-21 2019-04-16 苏州东方模具科技股份有限公司 Glass mold bimetallic mouth mold and preparation method thereof
CN110026633A (en) * 2019-04-04 2019-07-19 河北躬责科技有限公司 A kind of microchannel heat sink and welding method
CN110026633B (en) * 2019-04-04 2021-07-16 河北躬责科技有限公司 Micro-channel radiator and welding method

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Application publication date: 20111019