Method for diffusion connection of high-niobium TiAl alloy by using composite metal foil

A composite metal and diffusion bonding technology, which is applied in metal processing equipment, welding equipment, welding/welding/cutting items, etc., can solve the problems of poor joint quality, complicated process, and long time consumption, so as to avoid deformation and simple process Effect

Inactive Publication Date: 2016-07-27
HARBIN INST OF TECH AT WEIHAI +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In order to solve the problems of complex process, poor joint quality and long time-consuming of vacuum diffusion bonding high-niobium TiAl alloy, the present invention proposes a method for bonding high-niobium TiAl alloy by composite metal foil diffusion bonding with simple process, high work efficiency and good quality

Method used

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  • Method for diffusion connection of high-niobium TiAl alloy by using composite metal foil

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Embodiment 1

[0021] In this embodiment, a method of using composite metal foil to diffusely connect high-niobium TiAl alloys is carried out according to the following steps: 1. Use 600#, 800#, 1200#, 1500#, and 2000# for the connection surface of the high-niobium TiAl alloy to be welded successively. #Grinding with metallographic sandpaper, then polishing with 0.5μm polishing paste, and ultrasonically cleaning the base material to be welded and the middle layer of the composite foil in acetone for 10 minutes;

[0022] 2. Place the base metal after ultrasonic cleaning and the foil with a thickness of 10-30 μm in the order of high-niobium TiAl / Ti / Nb / Ti / high-niobium TiAl, and apply an axial pressure of 15-30 MPa to the connection sample; When implementing diffusion connection, vacuum the chamber of the vacuum diffusion welding machine to 5×10 -3 After Pa, start heating with electricity, the heating rate is 15-30°C / min, heat to 1100-1300°C, and hold the temperature for 1-3 hours;

[0023] 3. ...

Embodiment 2

[0025] Embodiment 2: The difference between this embodiment and the first embodiment is that the thickness of the foil used in the second step is 20 μm Ti foil and 15 μm Nb foil. Others are the same as in Example 1.

Embodiment 3

[0026] Embodiment 3: The difference between this embodiment and Embodiment 1 is that the heating rate used in step 2 is 20° C. / min. Others are the same as in Example 1.

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Abstract

The invention discloses a method for diffusion connection of a high-niobium TiAl alloy by using a composite metal foil. The diffusion connection comprises the following steps: (1) a high-niobium TiAl alloy connecting surface to be welded is polished after being ground by using an abrasive paper; and parent metal to be welded and a composite foil middle layer are positioned in acetone for ultrasonic cleaning for 10 min; (2) the ultrasonically cleaned parent metal and the foil with a thickness of 10-30 microns are placed according to a sequence of high-niobium TiAl/Ti/Nb/Ti/high-niobium TiAl; axial pressure of 15-30 MPa is applied to a connecting sample; in diffusion connection, after a furnace cavity of a vacuum diffusion welding machine is vacuumized to 5*10<-3> Pa, electrification is performed for heating to reach 1100-1300 DEG C; the heating speed is 15-30 DEG C/min; and the temperature and the pressure are kept for 1-3 h; and (3) after heat insulation, cooling is performed to reach 600 DEG C at a speed of 5-10 DEG C/min; and then, furnace cooling is performed to reach room temperature to finish diffusion connection of the high-niobium TiAl alloy. The method has such advantages as simple process, short consumed time and high quality of an objected connecting joint.

Description

technical field [0001] The invention relates to a high niobium TiAl alloy diffusion connection, in particular to a method for diffusion bonding high niobium TiAl alloy by using composite metal foil. Background technique [0002] We know that TiAl-based alloys have the advantages of low density, high strength, and excellent oxidation resistance and high temperature creep resistance, and are considered to be an ideal and promising high-temperature structural material for aerospace, military and civilian use. The addition of Ni reduces its diffusion coefficient and improves the oxidation resistance, making the high-niobium TiAl alloy a new generation of very potential high-temperature structural materials. However, because the machinability of TiAl-based alloys is relatively poor, and the method of mechanical connection will increase its actual load, the study of welding methods for TiAl-based alloys plays an important role in promoting its practical application. Scholars at h...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K20/14B23K103/10B23K103/14
CPCB23K20/14B23K2103/10B23K2103/14
Inventor 宋晓国包潘飞彭赫力刘海建袁勇李中权冯吉才
Owner HARBIN INST OF TECH AT WEIHAI
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