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A method for diffusion bonding dissimilar materials using an amorphous interlayer

A technology of diffusion joining, dissimilar materials, applied in welding equipment, non-electric welding equipment, welding/welding/cutting items, etc., which can solve the problem of inter-layer intermetallic compounds and corrosion, reduced dimensional accuracy of weldments, high welding pressure and temperature, etc. problems, to achieve the effect of lowering melting point, reducing welding defects, and improving corrosion resistance

Active Publication Date: 2020-10-09
SHANGHAI SPACE PRECISION MACHINERY RES INST
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In order to solve the above welding of dissimilar materials, the use of diffusion connection requires high welding pressure and temperature, which is prone to residual stress, resulting in welding cracks, reduced strength, and increased deformation, resulting in reduced dimensional accuracy of weldments, and the use of intermediate layers is easy to produce metal issues such as intercompounds and corrosion

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  • A method for diffusion bonding dissimilar materials using an amorphous interlayer

Examples

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Effect test

Embodiment 1

[0024] TC4 titanium alloy and Si 3 N 4 For ceramic dissimilar material welding, a nanocrystalline thin layer with the same composition as the metal base material is prepared by magnetron sputtering on the surface of the titanium alloy base material to be welded, with a thickness of 2 μm. The alloy with the same composition as the titanium alloy base material was prepared by strip-throwing method to form an amorphous strip as an intermediate layer with a thickness of 30 μm. The amorphous strip was placed between the titanium alloy and the ceramic surface to be welded and fixed with tooling. Put two workpieces to be welded with a nanocrystalline thin layer and an amorphous intermediate layer into a vacuum furnace, apply a pressure of 2 MPa on the surface to be welded, and wait until the vacuum degree in the furnace drops to 5.0×10 -3 Below Pa, heat up the furnace at a heating rate of 10°C / min, and wait for the temperature to rise to 950°C for 30 minutes for diffusion connection...

Embodiment 2

[0026] Copper alloy and TC4 titanium alloy dissimilar materials are welded, and a layer of nanocrystalline thin layer with the same composition as the metal base material is prepared on the surface of the titanium alloy base material to be welded by magnetron sputtering, with a thickness of 3 μm. The alloy with the same composition as the copper alloy base material was prepared by strip-spinning method to form an amorphous thin strip as the intermediate layer with a thickness of 40 μm. The amorphous thin strip was placed between the copper alloy and the titanium alloy to be welded and fixed with tooling. Put two workpieces to be welded with a nanocrystalline thin layer and an amorphous intermediate layer into a vacuum furnace, apply a pressure of 4 MPa on the surface to be welded, and wait until the vacuum degree in the furnace drops to 5.0×10 -3 Below Pa, heat up the furnace at a heating rate of 12°C / min, and wait for the temperature to rise to 900°C for 40 minutes for diffusi...

Embodiment 3

[0028] Copper alloy and ZrO 2 For ceramic dissimilar material welding, a nanocrystalline thin layer with the same composition as the metal base material is prepared by magnetron sputtering on the surface of the copper alloy base material to be welded, with a thickness of 4 μm. The alloy with the same composition as the copper alloy base material was prepared by strip-throwing method to form an amorphous thin strip as an intermediate layer with a thickness of 50 μm. The amorphous thin strip was placed between the copper alloy and the ceramic surface to be welded and fixed with tooling. Put two workpieces to be welded with a nanocrystalline thin layer and an amorphous intermediate layer into a vacuum furnace, apply a pressure of 6 MPa on the surface to be welded, and wait until the vacuum degree in the furnace drops to 5.0×10 -3 Below Pa, heat up the furnace at a heating rate of 13°C / min, and wait for the temperature to rise to 850°C for 45 minutes for diffusion connection. Aft...

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Abstract

The invention discloses a method of diffusion bonding of heterogeneous materials using amorphous interlayers. An interlayer material adopts the alloy which is consistent with one kind of metal base material, amorphous thin strips are prepared by adopting the belt-spinning method, and the interlayer material is prepared through the steps of acid pickling and the like, after a nanocrystalline thin layer is prepared by magnetron sputtering on the surface of metal base material to be welded, the amorphous thin strips are placed between two kinds of materials to be welded, and diffusion welding is completed under a certain temperature and pressure. According to the method of diffusion bonding of heterogeneous materials using amorphous interlayers, the problems that the diffusion bonding of heterogeneous materials is easy to produce residual stress and the like are solved, welding at 30-50 DEG C lower than normal design temperature can be conducted, the applied pressure can be reduced by 20-30%, and the method is especially suitable for products which are difficult-to-weld heterogeneous materials and have high strength, dimensional precision and corrosion resistance.

Description

technical field [0001] The invention relates to a method for diffusion connecting dissimilar materials by using an amorphous interlayer, and belongs to the field of welding technology. Background technique [0002] With the development of the aerospace industry, structural materials have put forward higher requirements for light weight and functionality. The welded structure made of different materials can not only take advantage of the performance advantages of different materials to reduce weight and cost, but also meet the material requirements of different working conditions. It has gradually been widely used in aerospace, machinery, chemical, electric power, nuclear industries and other industries. application. It is difficult to achieve reliable connection of dissimilar materials with traditional fusion welding methods, especially dissimilar materials with large performance differences, such as metal and ceramics, aluminum and titanium, etc. [0003] At present, the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K20/00B23K20/14B23K20/16B23K20/24B23K103/18
CPCB23K20/001B23K20/14B23K20/16B23K20/24B23K2103/18
Inventor 陈旭彭赫力刘海建杨旭东李中权何光荣袁勇张小龙
Owner SHANGHAI SPACE PRECISION MACHINERY RES INST
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