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A kind of diffusion welding connection method using cu foil and ti foil as composite intermediate layer

A technology of composite intermediate layer and connection method, applied in welding equipment, welding/welding/cutting items, non-electric welding equipment, etc., can solve the problems of high welding temperature and holding time, damage, limited research reports, etc., and reduce welding specifications. requirements, reducing the tendency to form, the effect of a good connection

Active Publication Date: 2020-08-11
AVIC BEIJING INST OF AERONAUTICAL MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

due to Ti 2 AlNb alloy or Ti 3 The solution treatment temperature of Al-based alloys is in the range of 980°C to 1020°C. Such a high welding temperature and holding time in this patent may damage Ti 2 AlNb alloy or Ti 3 The structure and properties of the Al-based alloy base metal, good joint performance can not be obtained at the expense of the performance of the base metal
[0006] The above is about nickel-based superalloys and Ti 2 AlNb alloy or Ti 3 The main research progress of Al-based alloy connection, the research reports on this field at home and abroad are still relatively limited

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Example 1, using copper foil and titanium foil as composite interlayers for nickel-based superalloy and Ti 3 Diffusion welding of Al-based alloys, the welding process is as follows:

[0032] Step 1. Use wire cutting to cut nickel-based superalloy and Ti 3 The Al-based alloy is processed into the required size, the to-be-welded surface of the base metal to be welded is polished with sandpaper, and then polished to obtain the base metal to be welded;

[0033] Step 2, adopt the HNO that volume ratio is 1: 9 3 , H 2 The O solution was used to remove the oxide film on the copper foil with a thickness of 30μm, and the etching time was 30s. The volume ratio of HF and HNO was 1:3:21. 3 , H 2 The titanium foil with a thickness of 40 μm was treated with O solution to remove the oxide film, and the etching time was 50 s to obtain an intermediate layer for diffusion welding;

[0034] Step 3. Put the treated base metal, copper foil and Ti foil into acetone for ultrasonic cleani...

Embodiment 2

[0038] Embodiment 2, with copper foil and titanium foil as composite interlayer, nickel-based superalloy and Ti 3 Diffusion welding of Al-based alloys, the welding process is as follows:

[0039] Step 1. Use wire cutting to cut nickel-based superalloy and Ti 3 The Al-based alloy is processed into the required size, the to-be-welded surface of the base metal to be welded is polished with sandpaper, and then polished to obtain the base metal to be welded;

[0040] Step 2, adopt the HNO that volume ratio is 1: 9 3 , H 2 The copper foil with a thickness of 20 μm was treated with O solution to remove the oxide film, and the etching time was 20 s. The volume ratio of HF and HNO was 1:3:21. 3 , H 2 The titanium foil with a thickness of 30 μm was treated with O solution to remove the oxide film, and the etching time was 30 s to obtain an intermediate layer for diffusion welding;

[0041] Step 3. Put the treated base metal, copper foil and Ti foil into acetone for ultrasonic clean...

Embodiment 3

[0044] Embodiment 3, using copper foil and titanium foil as composite interlayers for nickel-based superalloy and Ti 2 Diffusion welding of AlNb alloys, the welding process is as follows:

[0045] Step 1. Use wire cutting to cut nickel-based superalloy and Ti 2 The AlNb alloy is processed into the required size, the surface to be welded of the base metal to be welded is polished with sandpaper, and then polished to obtain the base metal to be welded;

[0046] Step 2, adopt the HNO that volume ratio is 1: 9 3 , H 2 The copper foil with a thickness of 20 μm was treated with O solution to remove the oxide film, and the etching time was 20 s. The volume ratio of HF and HNO was 1:3:21. 3 , H 2 The titanium foil with a thickness of 30 μm was treated with O solution to remove the oxide film, and the etching time was 30 s to obtain an intermediate layer for diffusion welding;

[0047] Step 3. Put the treated base metal, copper foil and Ti foil into acetone for ultrasonic cleaning...

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Abstract

The invention relates to a method for connecting a nickel-based superalloy with a Ti2AlNb alloy or a Ti3Al-based alloy, in particular to a diffusion welding connecting method adopting Cu foil and Ti foil as a composite interlayer. The diffusion welding connecting method comprises the steps that the nickel-based superalloy and the Ti2AlNb alloy or the Ti3Al-based alloy are processed into the neededsizes, ground and polished; the Cu foil and the Ti foil are subjected to oxidation film removing, and are placed into acetone with a welded base material to be subjected to ultrasonic cleaning; and the Cu foil makes contact with the nickel-based superalloy, the Ti foil makes contact with the Ti2AlNb alloy or the Ti3Al-based alloy, and thus a welded test piece with the structure of the Ti2AlNb alloy or the Ti3Al-based alloy / the Ti foil / the Cu foil / the nickel-based superalloy is obtained, a welded workpiece is placed into a vacuum heating furnace, the pressure is applied, and welding is completed after heating, heat preservation and cooling heat circulating. The welding temperature can be lowered, forming of a brittle phase of a joint is controlled, and the property of the joint is improved; and the obtained shearing strength of the joint at the room temperature reaches 240-310 MPa.

Description

technical field [0001] The invention relates to a diffusion welding connection method using Cu foil and Ti foil as a composite intermediate layer, and belongs to the technical field of welding. Background technique [0002] Titanium-aluminum intermetallic compounds have the advantages of low density, high specific strength, specific stiffness, good oxidation resistance, creep resistance and fatigue resistance, and are one of the most promising aerospace lightweight high-temperature structural materials in the future. one. Among titanium-aluminum intermetallic compounds, Ti 2 AlNb alloy or Ti 3 The research on Al-based alloys has been paid attention to, and its working temperature can reach 700 °C. Compared with ordinary titanium alloys, Ti 2 AlNb alloy or Ti 3 Al-based alloys can be serviced at higher temperatures; they have lower densities than nickel-based superalloys, about half that of nickel-based superalloys. In the automotive industry, Ti can be used 2 AlNb all...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K20/00B23K20/14B23K20/233B23K20/24B23K103/18
CPCB23K20/001B23K20/14B23K20/233B23K20/24
Inventor 任海水熊华平程耀永陈波李文文
Owner AVIC BEIJING INST OF AERONAUTICAL MATERIALS
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