Method for vacuum scattering intermetallic compound for coupling TiAL

An intermetallic compound, vacuum diffusion technology, applied in metal processing equipment, welding equipment, non-electric welding equipment and other directions, can solve the problems of high temperature and high pressure of diffusion bonding.

Inactive Publication Date: 2008-05-14
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] In order to solve the technical deficiencies of high diffusion bonding temperature and high diffusion bonding pressure in the existing TiAl i

Method used

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  • Method for vacuum scattering intermetallic compound for coupling TiAL
  • Method for vacuum scattering intermetallic compound for coupling TiAL
  • Method for vacuum scattering intermetallic compound for coupling TiAL

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specific Embodiment approach 1

[0007] Specific Embodiment 1: The method of vacuum diffusion bonding TiAl intermetallic compounds in this embodiment is realized through the following steps: 1. Clean the surface of the base metal before diffusion bonding; 2. Place the diffusion intermediate layer evenly to be welded The connecting surface of the base metal; the middle layer of the diffusion connection is hydrogenated titanium or titanium alloy foil, and the thickness of the diffusion connection middle layer is 30-100 μm; 3. Place the clamped weldment in a vacuum diffusion welding machine for heating, In a vacuum of 1.33×10 -3 ~4.0×10 -3 Diffusion connection is carried out under Pa vacuum condition; 4. After welding, the weldment is depressurized when the original vacuum condition drops to 100°C, and the weldment is taken out when the temperature is lowered to room temperature.

[0008] In this implementation method, the diffusion bonding process parameters should adopt the corresponding diffusion bonding tem...

specific Embodiment approach 2

[0009] Specific embodiment 2: The difference between this embodiment and specific embodiment 1 is that in step 1, the surface of the parent material is cleaned by physical cleaning, chemical cleaning or first physical cleaning followed by chemical cleaning; the physical cleaning is performed with 400 # 、50 # 、600 # , 80 # 、1000 # The metallographic sandpaper is polished step by step; the chemical cleaning is to prepare the corresponding corrosion solution according to the difference of the base metal to remove the adsorption layer, impurities or oxide film on the surface of the base metal, and then wipe the surface of the base metal to be welded with acetone or remove the base metal The materials were cleaned ultrasonically in acetone solution. Other process conditions and processes are the same as those in Embodiment 1.

specific Embodiment approach 3

[0010] Embodiment 3: This embodiment is different from Embodiment 1 in that: in step 2, the thickness of the intermediate layer is diffusion-connected to 30-80 μm. Other process conditions and processes are the same as those in Embodiment 1.

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Abstract

The invention relates to a TiAl-intermetallic-compound vacuum diffusing connection method, belonging to the TiAl-intermetallic-compound welding field, which overcomes the technical drawbacks of high temperature of diffusing connection and high pressure of diffusing connection in the prior TiAl-intermetallic-compound diffusing connection technology. The invention adopts hydrogenated titanium or titanium alloy chaff as the interface layer of diffusing connection. Ti3Al+TiAl dual phase (Alpha2+Gamma) organ can be formed under the temperature of diffusing connection titanium, which facilitates the formation of high-intensity connector lug of TiAl-intermetallic-compound diffusing connection. And hydrogen makes the flow stress of thermal deformation of titanium or titanium alloy decrease and the thermal plasticity increase, so that hydrogenated titanium or titanium alloy is prone to deform under high temperature. Meanwhile,, the self-diffusing capacity of hydrogen in titanium or titanium alloy and the diffusing capacity of solute are enhanced, more particularly, in Beta phase the capacities are more enhanced, so that hydrogen can accelerate the diffusing of the alloy elements, reduce the atomic combination energy and the diffusing activation energy, promote the diffusing coordinated deformation capacity, and the reliable diffusing connection of connector lug of TiAl-intermetallic-compound can be realized under comparatively low temperature.

Description

technical field [0001] The invention belongs to the field of TiAl intermetallic compound welding and is suitable for the connection of TiAl intermetallic compounds and other different materials. Background technique [0002] TiAl intermetallic compounds have a low density (about 3.8g / cm 3 ), high specific strength, good rigidity, good high-temperature mechanical properties and oxidation resistance, etc., are considered to be an ideal new high-temperature structural material for aviation, aerospace, military and civilian use with great development and application prospects. When TiAl intermetallic compounds are applied in engineering and made into components, they will inevitably encounter welding problems, including their own welding and welding with other materials. Scholars at home and abroad have carried out relevant research on the joining technology of TiAl intermetallic compounds. From the current literature and reports, it mainly includes fusion welding methods such ...

Claims

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Application Information

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IPC IPC(8): B23K20/16B23K20/24
Inventor 何鹏冯吉才王明刘永斌黄麟
Owner HARBIN INST OF TECH
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