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Diffusion welding bonding method using Ti foil as intermediate layer

A connection method and intermediate layer technology, applied in welding equipment, welding/welding/cutting items, non-electric welding equipment, etc., can solve problems such as limited research reports, achieve the effect of ensuring joint performance and relieving internal stress

Inactive Publication Date: 2018-11-09
AVIC BEIJING INST OF AERONAUTICAL MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In summary, the current domestic and foreign research on TiAl alloy and Ti 2 AlNb alloy or Ti 3 Research reports on Al-based alloy dissimilar connections are still very limited

Method used

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  • Diffusion welding bonding method using Ti foil as intermediate layer
  • Diffusion welding bonding method using Ti foil as intermediate layer

Examples

Experimental program
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Embodiment 1

[0026] In this embodiment, TiAl alloy and Ti are connected by diffusion welding using Ti foil as the intermediate layer. 2AlNb alloy, the steps of the method are:

[0027] Step 1. Using wire cutting to combine TiAl alloy with Ti 2 The AlNb alloy is processed into the required size to obtain the base metal to be welded;

[0028] Step 2. Polish the surface to be welded of the base material to be welded with sandpaper, and then perform polishing treatment. Put the polished base material to be welded and Ti foil with a thickness of 10-30 μm into acetone and ultrasonically clean it for 3-10 minutes;

[0029] Step 3. Place the Ti foil on the TiAl alloy and Ti 2 Between the surfaces of the AlNb alloy to be welded, place it in a vacuum heating furnace and apply a pressure of 5-30 MPa. When the vacuum degree in the vacuum heating furnace reaches 9×10 -2 ~1×10 -3 After Pa, start heating with electricity, the heating rate is 5-15°C / min, when it is heated to 850°C-1050°C, keep it at t...

Embodiment 2

[0031] The difference between this embodiment and the first embodiment is that the first step is to use wire cutting to separate the TiAl alloy and Ti 3 The Al-based alloy is processed into the required size, and the Ti foil is placed on the TiAl alloy and the Ti foil as described in the third step. 3 Between the surfaces to be welded of Al-based alloys. Others are the same as in Embodiment 1.

Embodiment 3

[0033] The difference between this embodiment and the first embodiment is that in the third step, the polished base metal to be welded and the Ti foil with a thickness of 20-30 μm are placed in acetone and ultrasonically cleaned for 3-10 minutes. Others are the same as in Embodiment 1.

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Abstract

The invention provides a diffusion welding bonding method using Ti foil as the intermediate layer. The connection in the method refers to the connection of TiAl alloy to Ti2AlNb alloy or Ti3Al-based alloy. The method is to process a TiAl alloy and a Ti2AlNb alloy or a Ti3Al based alloy into a desired size. The welded base material is polished and polished; the soldered base material and Ti foil are ultrasonically cleaned in acetone; the Ti foil is placed between the welded base materials, placed in a vacuum heating furnace, pressure is applied, and the welding is completed after heating, heatpreservation, and cooling. The invention can avoid the introduction of impurity elements in the welding process, and can obtain the connection interface without continuous brittle phase, the tensile strength of the joint at room temperature reaches 380-410 MPa, and the tensile strength at 650 DEG C can reach 350 MPa to 370 MPa.

Description

technical field [0001] The invention relates to a diffusion welding connection method using Ti foil as an intermediate layer, belonging 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, good creep resistance and fatigue resistance, and are the most promising light-weight high-temperature structural materials for aerospace in the future. one. Among titanium-aluminum intermetallic compounds, TiAl alloys, Ti 2 AlNb alloy or Ti 3 The research on Al-based alloys has been paid attention to, and the working temperature of TiAl alloys can reach 760°C to 850°C. 2 AlNb alloy or Ti 3 The working temperature of Al-based alloys can reach 700°C. Compared with ordinary titanium alloys, TiAl alloys, Ti 2 AlNb alloy or Ti 3 Al-based alloys can serve at higher temperatures; compared with superalloys, they have lower density,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K20/14B23K20/16B23K20/24B23K103/18
CPCB23K20/14B23K20/16B23K20/24
Inventor 任海水熊华平程耀永陈波
Owner AVIC BEIJING INST OF AERONAUTICAL MATERIALS
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