Diffusion connection method for high-temperature TiAl alloy annular piece and Ti2AlNb alloy annular piece

A technology of diffusion joining and annular parts, applied in welding equipment, metal processing equipment, non-electric welding equipment, etc., can solve the problems of insufficient technical research, no diffusion connection of annular parts, complicated AlNb alloy diffusion joining process, etc., and achieve reliable connection. Effect

Active Publication Date: 2018-03-02
重庆两航金属材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] At present, due to the high temperature TiAl alloy and Ti 2 The diffusion bonding process of AlNb alloy is relatively complicat

Method used

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  • Diffusion connection method for high-temperature TiAl alloy annular piece and Ti2AlNb alloy annular piece
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  • Diffusion connection method for high-temperature TiAl alloy annular piece and Ti2AlNb alloy annular piece

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] The concrete process of this embodiment is:

[0030] Step 1: Cut the sample. The high temperature TiAl alloy and Ti 2 The AlNb alloy is processed to obtain the designed size alloy samples to be connected, which are the plate edge 2 and the TiAl alloy of the high temperature TiAl alloy respectively. 2 Disk core of AlNb alloy 1. The inclination angle of the connection interface between the disk edge and the disk core is 10°;

[0031] Step 2: Surface treatment. The high-temperature TiAl alloy plate edge 2 obtained in step 1 and Ti 2 The connection surface of the AlNb alloy disc core 1 is finely ground to eliminate obvious scratches on the surface to be connected. Immerse the sample in absolute ethanol for ultrasonic degreasing treatment for 5 minutes, and store it in absolute ethanol;

[0032] Step 3: Clamping and assembly. Apply boron nitride solder stopper on the surface of fixture 3 in contact with the test piece, and place the high-temperature TiAl alloy plate e...

Embodiment 2

[0035] The concrete process of this embodiment is:

[0036] Step 1: Cut the sample. The high temperature TiAl alloy and Ti 2 The AlNb alloy is processed to obtain the designed size alloy samples to be connected, which are the plate edge 2 and the TiAl alloy of the high temperature TiAl alloy respectively. 2 Disk core of AlNb alloy 1. The inclination angle of the connection interface between the disk edge and the disk core is 15°;

[0037] Step 2: Surface treatment. The high-temperature TiAl alloy plate edge 2 obtained in step 1 and Ti 2 The connection surface of the AlNb alloy disc core 1 is finely ground to eliminate obvious scratches on the surface to be connected. Immerse the sample in absolute ethanol for ultrasonic degreasing treatment for 5 minutes, and store it in absolute ethanol;

[0038] Step 3: Clamping and assembly. Apply boron nitride solder stopper on the surface of fixture 3 in contact with the test piece, and place the high-temperature TiAl alloy plate e...

Embodiment 3

[0041] The concrete process of this embodiment is:

[0042] Step 1: Cut the sample. The high temperature TiAl alloy and Ti 2 The AlNb alloy is processed to obtain the designed size alloy samples to be connected, which are the plate edge 2 and the TiAl alloy of the high temperature TiAl alloy respectively. 2 Disk core of AlNb alloy 1. The inclination angle of the connection interface between the disk edge and the disk core is 20°;

[0043] Step 2: Surface treatment. The high-temperature TiAl alloy plate edge 2 obtained in step 1 and Ti 2 The connection surface of the AlNb alloy disc core 1 is finely ground to eliminate obvious scratches on the surface to be connected. Immerse the sample in absolute ethanol for ultrasonic degreasing treatment for 5 minutes, and store it in absolute ethanol;

[0044] Step 3: Clamping and assembly. Apply boron nitride solder stopper on the surface of fixture 3 in contact with the test piece, and place the high-temperature TiAl alloy plate e...

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Abstract

Disclosed is a diffusion connection method for a high-temperature TiAl alloy annular piece and a Ti2AlNb alloy annular piece. Pressure stress is provided through the expansion pressure difference of aclamp material and to-be-connected materials, and diffusion connection begins in the stepped temperature increasing process. Because the diffusion coefficient of a high-temperature TiAl disc edge islarger than the diffusion coefficient of a Ti2AlNb disc core, certain connecting pressure exists on a connecting interface in the stepped temperature decreasing process, and diffusion connection stillcontinues. In the process that the temperature is decreased to 800 DEG C, the connecting pressure existing in the heat preservation process is reduced gradually, and heat preservation treatment is conducted at the moment so that the excellent performance of a connector can be obtained easily. In the process that the temperature is decreased to the indoor temperature from 800 DEG C, the connectingpressure is increased gradually, heat preservation treatment is conducted at the temperature of 600 DEG C, and thus the excessively-large residual stress of the connector is avoided. Diffusion connection technical parameters are controlled simultaneously through a clamp, reliable connection of the dissimilar intermetallic compound annular pieces is achieved, and research and manufacturing foundations are provided for other complicated alloy annular pieces.

Description

technical field [0001] The present invention designs a kind of high temperature TiAl alloy and Ti 2 The invention relates to an AlNb alloy diffusion connection method, which is suitable for diffusion connection of ring parts and belongs to the field of solid-state welding of TiAl intermetallic compounds. Background technique [0002] TiAl-based intermetallic compounds have the characteristics of low density, high specific strength and good oxidation resistance, and are one of the ideal lightweight high-temperature structural materials. At present, TiAl alloys have been widely used in the preparation of important parts of aero-engines, high-temperature TiAl alloys and Ti 2 AlNb alloys can be used in the temperature ranges of 700°C to 900°C and 650°C to 700°C respectively, and are one of the important candidate materials for the preparation of engine components, which can effectively reduce the weight of the engine and improve the thrust-to-weight ratio and working efficiency...

Claims

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Application Information

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IPC IPC(8): B23K20/02B23K20/24B23K20/22B23K20/14
CPCB23K20/023B23K20/14B23K20/22B23K20/24
Inventor 唐斌张晓强李金山朱雷寇宏超王军孙智刚
Owner 重庆两航金属材料有限公司
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