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High-Nb-TiAl alloy diffusion bonding method

A technology of diffusion joining and alloying, which is used in welding equipment, metal processing equipment, welding/welding/cutting items, etc. It can solve the problems of complicated diffusion joining process, high diffusion joining temperature, and poor quality of diffusion joining joints, so as to simplify the diffusion joining process. The effect of joining technology, improving quality and reducing processing costs

Active Publication Date: 2014-05-14
NORTHWESTERN POLYTECHNICAL UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] In order to solve the problems of high diffusion bonding temperature, poor quality of diffusion bonding joints and complicated diffusion bonding process in the process of vacuum diffusion bonding of high Nb-TiAl alloys, the present invention proposes a method for diffusion bonding of high Nb-TiAl alloys

Method used

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Embodiment 1

[0026] The concrete process of this embodiment is:

[0027] Step 1: Treatment of the connecting surface of the specimen. Use 240#, 400#, 600#, 800#, 1000# and 1500# SiC water sandpaper to polish the surface of the sample in sequence, and use 1.5# diamond grinding paste for mechanical polishing after eliminating obvious scratches on the surface to be connected. The connection surface presents a mirror effect, and then the sample is immersed in absolute ethanol for ultrasonic degreasing treatment for 5 minutes, and stored in absolute ethanol.

[0028] Step 2: Vacuum diffusion connection. Combine the samples to be connected according to the connection requirements and put them into the vacuum diffusion welding machine for diffusion connection. When implementing diffusion connection, vacuum the chamber of the vacuum diffusion welding machine to 5×10 -3 Pa. The furnace chamber temperature of the vacuum diffusion welding machine was raised to 950°C at a heating rate of 10°C / min....

Embodiment 2

[0033] The concrete process of this embodiment is:

[0034] Step 1: Treatment of the connecting surface of the specimen. Treatment of the surface to be joined of high Nb-TiAl alloy forged samples. Use 240#, 400#, 600#, 800#, 1000# and 1500# SiC water sandpaper to polish the surface of the sample in sequence, and use 1.5# diamond grinding paste for mechanical polishing after eliminating obvious scratches on the surface to be connected. The connection surface presents a mirror effect, and then the sample is immersed in absolute ethanol for ultrasonic degreasing treatment for 5 minutes, and stored in absolute ethanol.

[0035] Step 2: Vacuum diffusion connection. Combine the samples to be connected according to the connection requirements and put them into the vacuum diffusion welding machine for diffusion connection. When implementing diffusion connection, vacuum the chamber of the vacuum diffusion welding machine to 5×10 -3 Pa. The furnace chamber temperature of the vacuum...

Embodiment 3

[0040] The concrete process of this embodiment is:

[0041] Step 1: Treatment of the connecting surface of the specimen. Treatment of the surface to be joined of high Nb-TiAl alloy forged samples. Use 240#, 400#, 600#, 800#, 1000# and 1500# SiC water sandpaper to polish the surface of the sample in sequence, and use 1.5# diamond grinding paste for mechanical polishing after eliminating obvious scratches on the surface to be connected. The connection surface presents a mirror effect, and then the sample is immersed in absolute ethanol for ultrasonic degreasing treatment for 5 minutes, and stored in absolute ethanol.

[0042] Step 2: Vacuum diffusion connection. Combine the samples to be connected according to the connection requirements and put them into the vacuum diffusion welding machine for diffusion connection. When implementing diffusion connection, vacuum the chamber of the vacuum diffusion welding machine to 5×10 -3 Pa. The furnace chamber temperature of the vacuum...

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Abstract

The invention discloses a high-Nb-TiAl alloy diffusion bonding method. According to the method, firstly, vacuum diffusion bonding is carried out on a forged high-Nb-TiAl alloy at a low temperature, and then vacuum annealing treatment is carried out on diffusion bonding samples. By effectively combining high-Nb-TiAl alloy diffusion bonding with vacuum annealing treatment, the joint quality of high-Nb-TiAl alloy diffusion bonding is significantly improved, and the microscopic structure of a weldment can be controlled. Meanwhile, axial pressure stress smaller than alloy flow stress is applied in the diffusion bonding process, so that materials are prevented from being deformed in the diffusion bonding process. The microscopic structure of a diffusion bonding joint obtained through the method is free of unclosed holes, weld interfaces disappear completely, structural evolution is thorough, and the diffusion bonding joint is high in quality.

Description

technical field [0001] The invention relates to the field of TiAl alloy solid-state welding, in particular to a diffusion bonding method for reducing the diffusion bonding temperature of high Nb-TiAl alloys, improving the diffusion bonding quality and simplifying the diffusion bonding process. Background technique [0002] TiAl alloys, especially high Nb-TiAl alloys (the atomic percentage of Nb is 5%-10%), have great application potential in aerospace engines due to their low density and good high temperature performance, but the processing performance of TiAl alloys is relatively low. Poor, it is difficult to prepare complex structural parts, which limits the practical application of TiAl alloys in engineering. Therefore, the research on the connection technology of TiAl alloy plays an important role in promoting its practical application. At present, the welding methods of TiAl alloy mainly include fusion welding methods such as argon arc welding, electron beam welding, a...

Claims

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Application Information

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IPC IPC(8): B23K20/14B23K20/24B23K20/26
CPCB23K20/001B23K20/14B23K20/2333B23K2103/18C21D9/50
Inventor 唐斌李金山齐先胜寇宏超孙智刚胡锐张铁邦
Owner NORTHWESTERN POLYTECHNICAL UNIV
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