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Titanium-copper based brazing filler metal for brazing titanium alloy and stainless steel, and preparation method and application thereof

A technology of titanium alloy and brazing filler metal, which is applied in the field of titanium-copper-based brazing filler metal composition formulation, can solve the problems of restricting the production and application of brazing filler metal, the highly toxic beryllium element, etc., and achieve the convenience of experiment and production assembly, and good wettability With fluidity, the effect of reducing build

Inactive Publication Date: 2019-06-28
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Literature "Lee J G, Lee J K, Hong S M, et al. Microstructure and bonding strength of titanium-to-stainless steel joints brazed using a Zr-Ti-Ni-Cu-Beamorphous filler alloy [J]. Journal of Materials Science, 2010, 45(24): 6837-6840." Adding effective demelting element Be to ordinary titanium-based solder, its maximum shear strength reached 190MPa, but beryllium is highly toxic, which greatly limits the use of this solder. production and application of

Method used

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  • Titanium-copper based brazing filler metal for brazing titanium alloy and stainless steel, and preparation method and application thereof
  • Titanium-copper based brazing filler metal for brazing titanium alloy and stainless steel, and preparation method and application thereof
  • Titanium-copper based brazing filler metal for brazing titanium alloy and stainless steel, and preparation method and application thereof

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Experimental program
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Effect test

Embodiment 1

[0033] Design the composition of titanium-copper-based solder: Based on the 24-electron criterion of cluster and connecting atom model and amorphous alloy composition design, select the TiCu eutectic point in the binary phase diagram, and obtain the cluster formula [Ti-Cu 6 Ti 8 ]Cu 3 , and replace the Ti and Cu atoms in the cluster formula with Zr and Ni atoms, respectively, so as to improve the amorphous forming ability of the solder.

[0034] This embodiment is finally based on the cluster formula [Ti-Cu 6 Ti 8 ]Cu 3 Get [Ti-Cu 6 Ti 5 Zr 3 ]CuNi 2 , and its corresponding alloy mass percentage expression is Ti 25.5 Zr 24.4 Cu 39.7 Ni 10.4 .

[0035] Melting alloy ingots: Mix raw materials (purity above 99.9%) according to a predetermined mass percentage, and use a vacuum arc melting furnace for melting with a vacuum degree of at least 6.0×10 -3 Pa, smelting 4 times to ensure an alloy ingot with uniform composition.

[0036] Preparation of titanium-copper-based so...

Embodiment 2

[0042] Ti of embodiment 1 25.5 Zr 24.4 Cu 39.7 Ni 10.4 Performance test of titanium-copper-based amorphous solder: the prepared Ti 25.5 Zr 24.4 Cu 39.7 Ni 10.4 Titanium-copper based amorphous solder cut into 5×5mm 2 The small pieces are placed between the samples to be welded. For brazing experiments, the assembled samples were placed in a vacuum brazing furnace and vacuumed to 6×10 -3 Start heating after Pa. First heat to 800°C at 10°C / min and hold for 10 minutes, then heat to 900°C at 20°C / min and hold for 10 minutes, and finally cool the sample to room temperature with the furnace. The room temperature shear strength of the brazed joint is 220MPa. Figure 4 It is the structure diagram of the brazed joint in this embodiment. It can be seen from the figure that a large number of lamellar structures are formed at the front edge of the titanium alloy matrix, indicating that Ti 25.5 Zr 24.4 Cu 39.7 Ni 10.4 Vigorous diffusion and metallurgical reactions occurred bet...

Embodiment 3

[0045] Prepare Ti according to the preparation method of brazing filler metal in embodiment 1 25.6 Zr 24.5 Cu 34.3 Ni 15.6 Titanium-copper based solder foil strips were tested for soldering.

[0046] Test experiment:

[0047] Cut the TC4 titanium alloy and 316L stainless steel wire into 5×5×4mm 3 and 15×10×4mm 3 The sample, the surface to be welded with 600 # Smooth it with sandpaper, and finally ultrasonically clean it in acetone for 10 minutes.

[0048] Sample assembly Cut the solder into 5×5mm 2 Place the small piece between the samples to be welded for the brazing experiment. Place the assembled sample in a vacuum brazing furnace and vacuumize to 6×10 -3 Start heating after Pa. First heat to 800°C at a rate of 10°C / min and hold for 10 minutes, then heat to 930°C at 20°C / min and hold for 10 minutes, and finally the sample is cooled to room temperature with the furnace.

[0049] By adopting this implementation method, a safe and reliable titanium alloy / stainless st...

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Abstract

The invention provides brazing filler metal for brazing titanium alloy and stainless steel. Based on theories of atomic cluster and atomic connection, titanium-copper based brazing filler metal for brazing the titanium alloy and the stainless steel is designed. The amorphous brazing filler metal Ti25.5Zr24.4Cu39.7Ni10.4 has excellent amorphous forming ability, lower melting point and good fluidity. When the brazing filler metal is used for brazing TC4 titanium alloy and 316L stainless steel, metallurgical reaction in brazing seams can be improved, formation of brittle compounds can be effectively controlled, and a brazing joint with higher strength can be obtained.

Description

technical field [0001] The invention relates to a composition formula of titanium-copper-based solder, specifically belonging to the field of brazing of titanium alloy and stainless steel Background technique [0002] Due to its high specific strength, excellent corrosion resistance and good high temperature resistance, titanium alloys are widely used in aerospace, chemical energy, petroleum, transportation and nuclear industries. Stainless steel has the advantages of low cost, good processing performance and good corrosion resistance. Therefore, the development of composite components of titanium alloy and stainless steel can give full play to the complementary advantages of the two in terms of performance and economy. The composite component has wide application prospects in the field of aerospace, such as engine oil pipe joints, rotor disks, blade joints, etc. However, due to the huge difference in thermal physical and chemical properties between titanium alloy and stai...

Claims

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Application Information

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IPC IPC(8): B23K1/008B23K1/20
Inventor 董红刚董闯李鹏夏月庆张润泽
Owner DALIAN UNIV OF TECH
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