TiNi shape memory alloy and stainless steel instant liquid-phase diffusion welding connection method

A technology of memory alloy and instantaneous liquid phase, applied in welding equipment, welding/welding/cutting items, non-electric welding equipment, etc., to relieve welding stress, improve mechanical properties and shape memory performance, and high corrosion resistance

Inactive Publication Date: 2009-02-11
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to solve the shortcomings of the existing TiNi shape memory alloy and stainless steel connection technology, to provide a TiNi shape memory alloy and stainless steel instantaneous liquid phase diffusion welding connection method

Method used

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  • TiNi shape memory alloy and stainless steel instant liquid-phase diffusion welding connection method
  • TiNi shape memory alloy and stainless steel instant liquid-phase diffusion welding connection method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] 1) Cut the TiNi shape memory alloy and stainless steel 304 into rectangular strips of 30×10×2mm, and grind them step by step with sandpaper until the surface is smooth and metallic, then put them into acetone solvent for ultrasonic cleaning for 10 minutes, and wipe them to dry;

[0022] 2) Cut the Ag72Cu28Ti0 metal foil with a thickness of 20μm into a square of 10×10mm, put it in acetone solvent and ultrasonically clean it for 10min, wipe it clean and dry it;

[0023] 3) Put the Ag72Cu28Ti0 metal foil between the TiNi shape memory alloy and stainless steel 304 to form a sandwich structure of TiNi shape memory alloy / Ag72Cu28Ti0 metal foil / stainless steel 304, and then fix it with a clamp (such as figure 1 shown), and placed in the vacuum chamber of the diffusion furnace, pre-coated solder resist on the contact surface of the welding fixture, TiNi shape memory alloy and stainless steel 304;

[0024] 4) Close the door of the vacuum chamber, apply a welding pressure of 0.05...

Embodiment 2

[0027] 1) Cut the TiNi shape memory alloy and stainless steel 304 into rectangular strips of 30×10×2mm, and grind them step by step with sandpaper until the surface is smooth and metallic, then put them into acetone solvent for ultrasonic cleaning for 10 minutes, and wipe them to dry;

[0028] 2) Cut the Ag62Cu27Ti11 metal foil with a thickness of 50 μm into a square of 10×10 mm, put it in acetone solvent and ultrasonically clean it for 10 minutes, wipe it and dry it;

[0029] 3) Place the Ag62Cu27Ti11 metal foil between the TiNi shape memory alloy and stainless steel 304 to form a sandwich structure of TiNi shape memory alloy / Ag62Cu27Ti11 metal foil / stainless steel 304, and fix it with a clamp (such as figure 1shown), and placed in the vacuum chamber of the diffusion furnace, pre-coated solder resist on the contact surface of the welding fixture, TiNi shape memory alloy and stainless steel 304;

[0030] 4) Close the door of the vacuum chamber, apply a welding pressure of 0.1M...

Embodiment 3

[0033] 1) Cut the TiNi shape memory alloy and stainless steel 304 into rectangular strips of 30×10×2mm, and grind them step by step with sandpaper until the surface is smooth and metallic, then put them into acetone solvent for ultrasonic cleaning for 10 minutes, and wipe them to dry;

[0034] 2) Cut the Ag67Cu20Ti13 metal foil with a thickness of 100 μm into a square of 10×10 mm, put it in acetone solvent and ultrasonically clean it for 10 minutes, wipe it and dry it;

[0035] 3) Place the Ag67Cu20Ti13 metal foil between the TiNi shape memory alloy and stainless steel 304 to form a sandwich structure of TiNi shape memory alloy / Ag67Cu20Ti13 metal foil / stainless steel 304, and fix it with a clamp (such as figure 1 shown), and placed in the vacuum chamber of the diffusion furnace, pre-coated solder resist on the contact surface of the welding fixture, TiNi shape memory alloy and stainless steel 304;

[0036] 4) Close the door of the vacuum chamber, apply a welding pressure of 2M...

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Abstract

The invention relates to a method for transient liquid phase diffusion bonding between TiNi shape memory alloy and stainless steel, which belongs to the technical field of the connection of dissimilar materials. In the prior art, the technology of the connection between TiNi shape memory alloy and stainless steel has the problems of welding crack, large crystal grains in the heat affected zone and poor mechanical properties. The transient liquid phase diffusion bonding between TiNi shape memory alloy and stainless steel is realized through the following steps: after the surfaces of TiNi shape memory alloy and stainless steel to be welded and the surface of AgCuTi foil is cleaned and dried, a TiNi shape memory alloy/AgCuTi metallic foil/stainless steel structure is formed, fixed through a welding clip, and then positioned in a vacuum diffusion oven, and welding pressure and temperature are applied to the structure. The method has the advantages that the welding temperature is low (relative to fusion welding), the influence to the base material is small, the connector has no welding defect, the shearing strength of the connector in the room temperature reaches 250 MPa, and the microhardness of the area near the seam section can reach 670 Hv.

Description

technical field [0001] The invention belongs to the technical field of connection of dissimilar materials, and in particular relates to a method for connecting TiNi shape memory alloy and stainless steel by instantaneous liquid phase diffusion welding. Background technique [0002] TiNi shape memory alloy has special shape memory effect and superelasticity, high specific strength, good wear resistance, corrosion resistance, vibration damping and biocompatibility, and can be widely used in space technology, energy transportation, automatic control, machinery manufacturing , biomedicine and everyday life. However, the price of TiNi shape memory alloy is relatively expensive. If it is connected with stainless steel with excellent performance and low price to form a composite component in practical applications, it can not only give full play to the respective performance advantages of the two materials, but also greatly reduce the material cost and expand the TiNi shape memory ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K20/16B23K20/24B23K103/18
Inventor 李红汪应玲栗卓新李国栋
Owner BEIJING UNIV OF TECH
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