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Thermal bending/diffusion bonding technology method for three-layer corrugated structure of TiAl base alloy

A technology of diffusion bonding and process method, applied in the field of TiAl-based alloy three-layer corrugated structure thermal bending/diffusion bonding process, can solve the problems of high energy consumption, low production efficiency, long process time, etc., to reduce energy consumption and improve efficiency , the effect of reducing heat exposure

Inactive Publication Date: 2016-09-21
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the problems of long process time, high energy consumption and low production efficiency in the preparation of three-layer corrugated structural parts by the existing thermal bending / diffusion connection combination process

Method used

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  • Thermal bending/diffusion bonding technology method for three-layer corrugated structure of TiAl base alloy
  • Thermal bending/diffusion bonding technology method for three-layer corrugated structure of TiAl base alloy
  • Thermal bending/diffusion bonding technology method for three-layer corrugated structure of TiAl base alloy

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specific Embodiment approach 1

[0017] Specific implementation mode one: combine Figure 1 to Figure 3 To illustrate this embodiment, a TiAl-based alloy three-layer corrugated structure thermal bending / diffusion bonding process method in this embodiment includes the following steps:

[0018] Step 1: Surface treatment:

[0019] The method of combining mechanical cleaning and chemical cleaning is used to remove the surface oxide layer and oil stains, and to clean the surface of the sheet to ensure that the surface is free from pollution;

[0020] Step 2: Arranging the three-layer corrugated structure;

[0021] Lay the lower panel 2 on the lower pressure head 1, set three strip-shaped lower pads 3 side by side on the lower panel 2, lay the core board 4 horizontally on the three strip-shaped lower pads 3, and arrange two upper pads 5 side by side on the core board 4 above, and the two upper pads 5 are located above the two adjacent strip-shaped lower pads 3 among the three strip-shaped lower pads 3, and the up...

specific Embodiment approach 2

[0024] Specific implementation mode two: combination Figure 1 to Figure 3 This embodiment will be described. In this embodiment, the upper panel 6 , the core panel 4 and the lower panel 2 are all rectangular plates. The dimensions of the upper panel 6 and the lower panel 2 in the length direction are equal to or smaller than the length of the core panel 4 . Other compositions and connections are the same as in the first embodiment.

specific Embodiment approach 3

[0025] Specific implementation mode three: combination Figure 1 to Figure 3 To illustrate this embodiment, after the corrugated core plate is formed in Step 3 of this embodiment, the pressure continues to increase at a rate of 2-3 MPa per minute until the pressure between the core plate and the panel reaches about 20 MPa. Under the pressure and constant temperature conditions, keep it for 2-3 hours to realize the diffusion connection between the upper panel 6 and the core panel 4 and the lower panel 2 and the core panel 4 . Other compositions and connections are the same as those in Embodiment 1 or Embodiment 2.

[0026] In order to be able to press the best corrugated core plate, the best thermal bending temperature is 1050°C. For diffusion connection, in order to form an excellent diffusion connection interface, the pressure should reach 12MPa, and the connection time is 3h. At this time, it can be formed Defect-free connection interface with high interface strength.

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Abstract

The invention relates to a thermal bending / diffusion bonding technology method, in particular to a thermal bending / diffusion bonding technology method for a three-layer corrugated structure of a TiAl base alloy so as to solve the problems that according to an existing thermal bending / diffusion bonding combined technology for preparing a three-layer corrugated structural piece, the procedure time is long, energy consumption is high, and the production efficiency is low. The method comprises the first step of surface treatment, the second step of placement of the three-layer corrugated structure and the third step of the thermal bending and diffusion combined technology, wherein in the third step, the thermal bending / diffusion bonding of the three-layer corrugated structural piece is conducted in a vacuum furnace, the vacuum degree is 10-3-10-4Pa, and after the temperature in the vacuum furnace ranges from 1,000 DEG C to 1,050 DEG C and is stable, an upper pressing head moves downwards at the speed of 1 mm / min, and an upper panel, a core veneer and a lower panel are pressed to form a corrugated core veneer; and after the corrugated core veneer is formed, the pressure is gradually increased, the pressure between the core veneer and the panels reaches 20 MPa, then, the pressure is kept unchangeable, and under the conditions of the constant temperature and the constant pressure, the current state is maintained for 2-3 h. The technology method is used for thermal bending / diffusion bonding of the three-layer corrugated structure.

Description

technical field [0001] The invention relates to a bending diffusion connection process method, in particular to a thermal bending / diffusion connection process method of a TiAl-based alloy three-layer corrugated structure. Background technique [0002] TiAl-based alloys due to their excellent properties, such as low density (3.8g / mm 3 ), high melting point, high specific strength, excellent oxidation resistance and corrosion resistance, and good creep toughness under high temperature conditions, as a lightweight and high-strength structural material, it has great application potential in the aerospace field. The three-layer corrugated structure has many advantages such as light weight and impact resistance, and has been widely used in the aerospace field. At present, the main process of the three-layer structure of TiAl-based alloy is the combined process of thermal bending / connection of the corrugated core plate. For the connection process, the commonly used technologies ma...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K20/02B23K20/14B23K20/24B21D13/02B23K103/08
CPCB21D13/02B23K20/023B23K20/14B23K20/24B23K2103/08
Inventor 张凯锋杜志豪
Owner HARBIN INST OF TECH
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