CN101362253B - TiNi shape memory alloy and stainless steel instant liquid-phase diffusion welding connection method - Google Patents
TiNi shape memory alloy and stainless steel instant liquid-phase diffusion welding connection method Download PDFInfo
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- CN101362253B CN101362253B CN2008102222222A CN200810222222A CN101362253B CN 101362253 B CN101362253 B CN 101362253B CN 2008102222222 A CN2008102222222 A CN 2008102222222A CN 200810222222 A CN200810222222 A CN 200810222222A CN 101362253 B CN101362253 B CN 101362253B
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Abstract
The invention relates to a method for transient liquid phase diffusion bonding between TiNi shape memory alloy and stainless steel, which belongs to the technical field of the connection of dissimilar materials. In the prior art, the technology of the connection between TiNi shape memory alloy and stainless steel has the problems of welding crack, large crystal grains in the heat affected zone and poor mechanical properties. The transient liquid phase diffusion bonding between TiNi shape memory alloy and stainless steel is realized through the following steps: after the surfaces of TiNi shape memory alloy and stainless steel to be welded and the surface of AgCuTi foil is cleaned and dried, a TiNi shape memory alloy/AgCuTi metallic foil/stainless steel structure is formed, fixed through a welding clip, and then positioned in a vacuum diffusion oven, and welding pressure and temperature are applied to the structure. The method has the advantages that the welding temperature is low (relative to fusion welding), the influence to the base material is small, the connector has no welding defect, the shearing strength of the connector in the room temperature reaches 250 MPa, and the microhardness of the area near the seam section can reach 670 Hv.
Description
Technical field
The invention belongs to foreign material interconnection technique field, be specifically related to TiNi marmem and stainless instant liquid-phase diffusion welding connection method.
Background technology
The TiNi marmem has special SME and super-elasticity, its specific strength height, resistance to wear, anticorrosive, vibration damping and biocompatibility be good, can be widely used in fields such as space technology, energy traffic, control automatically, machine-building, biomedicine and daily life.But TiNi marmem price is more expensive, if in actual applications itself and excellent performance, cheap stainless steel are connected into composite component, not only can give full play to two kinds of materials performance advantage separately, also can reduce material cost greatly, enlarge the range of application of TiNi marmem.
At present, the existing both at home and abroad research about TiNi marmem and stainless steel interconnection technique aspect is mainly adopted plasma arc welding (PAW), Laser Welding and soldering tech.Employing plasma arc welding (PAW)s such as Caspervander Eijk as Norway connect TiNi marmem and stainless steel A240, and the result shows that joint generates a large amount of TiC, Ti
2Ni, TiNi
3Deng frangible compounds, influence joint mechanical property and shape-memory properties, and the interface produces tangible weld crack (Casper vander Eijk, Hans Fostervoll near TiNi one side, ZuhairK, etal.Plasma Welding of NiTi to NiTi, Stainless Steel andHastelloy-C276[C] .ASM Materials Solutions 2003 Conference, Pittsburgh, Pennsylvania, USA, 2003,10:13～15.).The Guan Zezheng etc. of Japan adopts different filler, in infrared furnace in argon gas stream with pressure braze TiNi shape-memory alloy wire and the SUS304 stainless steel wire of 0.5MPa.When adopting the Ag base solder that does not add Ni, formed fragility FeTi based compound layer causes the tensile strength of joint to have only 275Mpa on connector area solder and the weldment interface; When employing adds the Ag base solder of Ni,, form a large amount of hard crisp TiNi in TiNi alloy one side though can suppress the generation of FeTi based compound
3Phase has been destroyed the orderly coherency of mother metal, the butt joint performance unfavorable (Off political affairs The, Trees is expanded in the Yamamoto .Ti-Ni shapes such as wild buttocks ?note Yi alloy と ス テ Application レ ス Steel ろ う pays. the Japanese metal Chi of association, 2000,64 (8): 632～640.).High artificial raising TiNi shape-memory alloy wire of the Li Ming of China and 306 stainless steel wire soldered fitting combination properties, developed a kind of AgCuZnSn solder, and adopt this solder to carry out the practical laser welding, the joint the maximum tensile strength is 360MPa, breaking strain is 10%, but joint TiNi one side heat affected area crystal grain is seriously grown up, consistency and elasticity reduces greatly, higher (the X.M.Qiu of while Laser Welding cost, M.G.Li, D.Q.Sun.Study on brazing of TiNi shapememory alloy with stainless steels.Journal of MaterialsProcessing Technology, 2006,176:8～12.).
Generally speaking, melting welding temperature is very big to the tissue and the performance impact of TiNi marmem.Ti is very strong to the affinity of C, O, H under the high temperature, and the TiNi alloy easily sucks these gases and forms frangible compounds at joint in the welding process, reduces the mechanical property and the shape-memory properties of joint; Sweating heat input simultaneously causes joint grain coarsening and heterogeneous element diffusion, has destroyed the orderly lattice structure of TiNi alloy mother metal, hinders the martensite phase transformation, thereby influences the SME of joint.On the other hand, TiNi marmem and stainless performance difference cause joint to produce compound between weld crack and brittle metal.And the diffusion interconnection technique is big to performance difference, mutual solubility is little, the easy foreign material that produces compound between brittle metal can be realized firm connection each other.But up to the present, Shang Weijian is about the report of TiNi marmem and stainless steel instant liquid-phase diffusion welding technology.
Summary of the invention
The objective of the invention is to solve the deficiency of existing TiNi marmem and stainless steel interconnection technique, a kind of TiNi marmem and stainless steel instant liquid-phase diffusion welding connection method are provided.
Method provided by the present invention may further comprise the steps:
1) TiNi marmem and stainless surface to be welded are polished flat after, ultrasonic wave cleans deoiling in acetone solvent, and dry;
2) with thickness be metal forming ultrasonic wave cleaning in acetone solvent of 20～100 μ m, and dry, and the percentage by weight of each element is in the metal forming: Ag:62～72%, Cu:20～28%, Ti:0～13%;
3) the i metal forming is placed between TiNi marmem and the stainless surface to be welded, after being combined into TiNi marmem/metal forming/stainless steel structure, in Clamp for welding, be fixed and clamped (as shown in Figure 1), and place the vacuum chamber of diffusion furnace, on Clamp for welding and TiNi marmem and stainless contact-making surface, apply solder resist;
4) apply the welding pressure of 0.05～2MPa, treat that vacuum reaches 10
-2～10
-3Behind the Pa, be warming up to 550～650 ℃ with the firing rate of 30～40 ℃/min, insulation 10～40min is warming up to 800～1000 ℃ again, behind insulation 10～100min, with stove cooling, release (as shown in Figure 2).
Principle of the present invention is: select for use the activation temperature scope to be lower than the metal forming of TiNi marmem and stainless steel fusion temperature as active intermediate.In the instant liquid-phase diffusion welding process, priming reaction at first takes place in active intermediate, decomposite active Ti atom and be diffused into TiNi marmem and stainless contact surface rapidly, activate the Ti of TiNi marmem and stainless steel surfaces on the one hand, Ni, Fe, atoms such as Cr, on the other hand, promote inter-diffusion reaction between above-mentioned each atom, generate cenotype, thereby, realize TiNi marmem and stainless metallurgical binding at TiNi marmem and metal forming active intermediate interface and metal forming active intermediate and stainless steel interface formation diffusion reaction layer.Under temperature-resistant condition, with diffusion reaction the carrying out of time, the active intermediate composition changes, and the fusing point of liquid metal constantly raises, and is deposited on matrix surface at last, promptly takes place " isothermal solidification ".And in the process with the stove cooling, each element further spreads, and the joint composition is tending towards homogenising, finally finishes the TiNi marmem and is connected with stainless.
Compare with stainless interconnection technique with existing TiNi marmem, the present invention has following beneficial effect:
1) TiNi marmem and stainless steel instant liquid-phase diffusion welding temperature are low than its melting welding temperature, tissue and performance impact to mother metal (TiNi marmem and stainless steel) in the welding process are little, and particularly the loss of TiNi side heat affected zone shape memory performance is less.
2) TiNi marmem and stainless steel instant liquid-phase diffusion welding joint have the composition that significantly is different from metallic intermediate layer after isothermal solidification is finished, and under a stable condition, can not differentiate the intermediate layer in the final microscopic structure, therefore, its joint is than the intensity height of general solder brazing joint, and corrosion stability is higher than soldered fitting.
3) add active intermediate, effectively alleviate because the welding stress that TiNi marmem and stainless physical and chemical performance difference cause, thereby the crackle that reduces joint is inclined to.Can improve the mechanical property and the shape-memory properties of joint by the composition of regulating the intermediate layer and the formation that specification is controlled frangible compounds simultaneously.Under suitable parameter, TiNi marmem and stainless steel instant liquid-phase diffusion welding connector do not have any weld defect, and its shear strength can reach 250Mpa, and the microhardness in nearly seam district reaches 670Hv.
Description of drawings
Fig. 1, the schematic diagram that is installed, wherein, 1 is that seaming chuck, 2 is that jig upper plate, 3 is that solder mask layer, 4 is TiNi marmem plate, and 5 is that jig lower plate, 6 is that push-down head, 7 is corrosion resistant plate, and 8 is the AgCuTi metal forming.
TiNi marmem and stainless steel instant liquid-phase diffusion welding process schematic representation among Fig. 2, the present invention.
The invention will be further described below in conjunction with the drawings and specific embodiments.
The specific embodiment
1) TiNi marmem and stainless steel 304 are cut into the rectangle strip of 30 * 10 * 2mm respectively, and with sand paper polish step by step to surfacing metallic luster is arranged after, put into the acetone solvent ultrasonic wave and clean 10min, clean and dry;
2) be that the Ag72Cu28Ti0 metal forming of 20 μ m is cut into the square of 10 * 10mm with thickness, and put into the acetone solvent ultrasonic wave and clean 10min, clean and dry;
3) the Ag72Cu28Ti0 metal forming is placed between TiNi marmem and the stainless steel 304, after being combined into the sandwich structure of TiNi marmem/Ag72Cu28Ti0 metal forming/stainless steel 304, be fixed and clamped (as shown in Figure 1) with jig, and place the vacuum chamber of diffusion furnace, on the contact-making surface of Clamp for welding and TiNi marmem and stainless steel 304, apply solder resist in advance;
4) close door for vacuum chamber, applying welding pressure is 0.05MPa, treats that vacuum reaches 1.0 * 10
-2Behind the Pa, be warming up to 550 ℃ with the programming rate of 30 ℃/min, insulation 40min is warming up to 800 ℃ again, and insulation 100min cools to room temperature with the furnace, release (as shown in Figure 2) afterwards.
Diffusion welding (DW) joint crystal grain is tiny, and shear strength reaches 224.8Mpa.
1) TiNi marmem and stainless steel 304 are cut into the rectangle strip of 30 * 10 * 2mm respectively, and with sand paper polish step by step to surfacing metallic luster is arranged after, put into the acetone solvent ultrasonic wave and clean 10min, clean and dry;
2) be that the Ag62Cu27Ti11 metal forming of 50 μ m is cut into the square of 10 * 10mm with thickness, and put into the acetone solvent ultrasonic wave and clean 10min, clean and dry;
3) the Ag62Cu27Ti11 metal forming is placed between TiNi marmem and the stainless steel 304, after being combined into the sandwich structure of TiNi marmem/Ag62Cu27Ti11 metal forming/stainless steel 304, be fixed and clamped (as shown in Figure 1) with jig, and place the vacuum chamber of diffusion furnace, on the contact-making surface of Clamp for welding and TiNi marmem and stainless steel 304, apply solder resist in advance;
4) close door for vacuum chamber, applying welding pressure is 0.1MPa, treats that vacuum reaches 5.0 * 10
-2Behind the Pa, be warming up to 600 ℃ with the programming rate of 35 ℃/min, insulation 20min is warming up to 880 ℃ again, and insulation 60min cools to room temperature with the furnace, release (as shown in Figure 2) afterwards.
Diffusion welding (DW) joint even tissue, crystal grain is tiny, and shear strength reaches 250.0Mpa.
1) TiNi marmem and stainless steel 304 are cut into the rectangle strip of 30 * 10 * 2mm respectively, and with sand paper polish step by step to surfacing metallic luster is arranged after, put into the acetone solvent ultrasonic wave and clean 10min, clean and dry;
2) be that the Ag67Cu20Ti13 metal forming of 100 μ m is cut into the square of 10 * 10mm with thickness, and put into the acetone solvent ultrasonic wave and clean 10min, clean and dry;
3) the Ag67Cu20Ti13 metal forming is placed between TiNi marmem and the stainless steel 304, after being combined into the sandwich structure of TiNi marmem/Ag67Cu20Ti13 metal forming/stainless steel 304, be fixed and clamped (as shown in Figure 1) with jig, and place the vacuum chamber of diffusion furnace, on the contact-making surface of Clamp for welding and TiNi marmem and stainless steel 304, apply solder resist in advance;
4) close door for vacuum chamber, applying welding pressure is 2MPa, treats that vacuum reaches 1.0 * 10
-3Behind the Pa, be warming up to 650 ℃ with the programming rate of 40 ℃/min, insulation 10min is warming up to 1000 ℃ again, and insulation 10min cools to room temperature with the furnace, release (as shown in Figure 2) afterwards.
Diffusion welding (DW) joint even tissue, crystal grain is grown up slightly, and intensity reaches 198.6Mpa.
Claims (1)
1. TiNi marmem and stainless steel instant liquid-phase diffusion welding connection method is characterized in that, may further comprise the steps:
1) TiNi marmem and stainless surface to be welded are polished flat after, ultrasonic wave cleans deoiling in acetone solvent, and dry;
2) with thickness be metal forming ultrasonic wave cleaning in acetone solvent of 20～100 μ m, and dry, and the percentage by weight of each element is in the metal forming: Ag:62～72%, Cu:20～28%, Ti:0～13%;
3) metal forming is placed between TiNi marmem and the stainless surface to be welded, after being combined into TiNi marmem/metal forming/stainless steel structure, in Clamp for welding, be fixed and clamped, and place the vacuum chamber of diffusion furnace, on Clamp for welding and TiNi marmem and stainless contact-making surface, apply solder resist in advance;
4) apply the welding pressure of 0.05～2Mpa, treat that vacuum reaches 10
-2～10
-3Behind the Pa, be warming up to 550～650 ℃ with the programming rate of 30～40 ℃/min, insulation 10～40min is warming up to 800～1000 ℃ again, behind insulation 10～100min, with stove cooling, release.
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| CN2008102222222A CN101362253B (en) | 2008-09-12 | 2008-09-12 | TiNi shape memory alloy and stainless steel instant liquid-phase diffusion welding connection method |
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| CN2008102222222A CN101362253B (en) | 2008-09-12 | 2008-09-12 | TiNi shape memory alloy and stainless steel instant liquid-phase diffusion welding connection method |
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| CN101362253B true CN101362253B (en) | 2010-06-02 |
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| CN102152017B (en) * | 2011-02-14 | 2012-10-24 | 吉林大学 | Method for connecting TiNi shape memory alloy and austenitic stainless steel heterogenetic material |
| CN102218592B (en) * | 2011-05-12 | 2013-04-24 | 西北工业大学 | Diffusion welding method of titanium or titanium alloy and stainless steel |
| CN102248274B (en) * | 2011-06-29 | 2013-05-08 | 重庆大学 | Sectional heterogeneous material high-temperature solid diffusion/low-temperature transient liquid-phase composite connection method |
| CN102303191B (en) * | 2011-06-29 | 2013-01-23 | 重庆大学 | Two-step mode two-temperature transient liquid-phase bonding method for dissimilar metals |
| CN103231136B (en) * | 2013-03-28 | 2015-09-02 | 北京工业大学 | A kind of laser braze welding method of Ti-Ni marmem and xenogenesis light metal |
| CN104465428B (en) * | 2013-09-16 | 2017-10-13 | 中国科学院上海微系统与信息技术研究所 | A kind of method of copper copper metal thermocompression bonding |
| CN105108257B (en) * | 2015-08-21 | 2018-01-12 | 南昌航空大学 | A kind of transition liquid-phase assisted Solid-state connection method |
| CN106041289A (en) * | 2016-07-05 | 2016-10-26 | 山东建筑大学 | Diffusion connection technology of laminated composite material and low-alloy steel |
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| CN108788437A (en) * | 2018-06-08 | 2018-11-13 | 哈尔滨工程大学 | Xenogenesis Ni-Ti-based shape memory alloy spreads welding connection method |
| CN108927598A (en) * | 2018-08-19 | 2018-12-04 | 廖思凡 | Vacuum atom welds diffusion facilities |
| CN109465532B (en) * | 2018-11-22 | 2020-09-18 | 中国科学院金属研究所 | Electron beam welding method for NiTi shape memory alloy and stainless steel |
| CN111745278B (en) * | 2019-03-29 | 2021-05-28 | 中国科学院金属研究所 | Method for connecting NiTi shape memory alloy and alumina ceramic |
| CN111136374B (en) * | 2020-01-03 | 2021-12-21 | 中航力源液压股份有限公司 | Isolation method for vacuum diffusion welding |
| CN111515517A (en) * | 2020-04-30 | 2020-08-11 | 中国航发哈尔滨东安发动机有限公司 | TLP (transient liquid phase) welding method for molybdenum-based superalloy |
| CN111545949A (en) * | 2020-05-22 | 2020-08-18 | 浙江诺维雅工贸有限公司 | Solder and heat-insulating container welded by same |
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| EP0508414A1 (en) * | 1991-04-09 | 1992-10-14 | The Furukawa Electric Co., Ltd. | Joined parts of Ni-Ti alloys with different metals and joining method therefor |
| CN101204760A (en) * | 2006-12-22 | 2008-06-25 | 南京理工大学 | High energy beam current welding press welding process and special clamp |
-
2008
- 2008-09-12 CN CN2008102222222A patent/CN101362253B/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0508414A1 (en) * | 1991-04-09 | 1992-10-14 | The Furukawa Electric Co., Ltd. | Joined parts of Ni-Ti alloys with different metals and joining method therefor |
| CN101204760A (en) * | 2006-12-22 | 2008-06-25 | 南京理工大学 | High energy beam current welding press welding process and special clamp |
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