Expansion connecting method for titanium and aluminium dissimillar non-ferrous metal

A diffusion connection and non-ferrous metal technology, which is applied in the diffusion connection between dissimilar metals and the diffusion connection of titanium and aluminum dissimilar non-ferrous metals, can solve the problems of reducing the bonding strength of joints and hindering the full diffusion of atoms, achieving low cost and high connection effect Good, easy to operate effect

Inactive Publication Date: 2007-04-11
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When vacuum brazing is used to connect titanium, aluminum and its alloys, the composition of Al-11.5Si eutectic alloy solder must be strictly controlled; when titanium, aluminum and their alloys are diffused, oxides are easily formed on the aluminum surface to hinder the full diffusion of atoms , it is necessary to take some special and strict process measures, otherwise, oxides or intermetallic compounds that are not conducive to diffusion connection will be easily formed at the bonding interface, which will reduce the bonding strength of the joint

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Industrial pure titanium TA2 and industrial pure aluminum 1035 cold-rolled plates, the sample size is 50mm×50mm×3mm. The key points of the process of diffusion bonding of pure titanium TA2 and pure aluminum 1035 dissimilar metals are as follows:

[0024] 1) After polishing and cleaning the surface of pure titanium TA2, immerse it in the plating flux solution, the composition of the flux flux solution is: add 0.4% Zn to the HCl aqueous solution with a concentration of 32%, and the flux flux time is 15 minutes.

[0025] 2) Dip the post-assisted titanium plate into molten aluminum at 700°C-720°C, the molten aluminum is composed of 92%-93% industrial pure aluminum, 2.5%-3.8% cast iron scrap, 4% Si, 0.2% Re , the hot-dip aluminum time is 25min, and an aluminized layer with a thickness of 60μm-80μm is formed on the surface of pure titanium TA2.

[0026] 3) The aluminized titanium plate is cleaned with water and alcohol, soaked in dilute hydrofluoric acid solution for 5 minut...

Embodiment 2

[0030] Diffusion connection of pure titanium and 3A21 aluminum alloy honeycomb structure (similar to lotus root section). The sample size is: pure titanium diameter 60mm, thickness 20mm; 3A21 aluminum alloy diameter 60mm, thickness 40mm. The specific diffusion bonding process steps are as follows:

[0031]1) Machining and grinding the titanium metal and 3A21 aluminum alloy surfaces to be connected, and immersing the pure titanium parts in the fluxing solution. The composition of the electroplating solution is as follows: 0.6% Zn is added to the HCl aqueous solution with a concentration of 33%, and the electroplating time is 18 minutes to 20 minutes.

[0032] 2) Immerse the pure titanium parts after fluxing into the molten aluminum at 700℃~720℃. The molten aluminum consists of 92%~93% industrial pure aluminum, 2.8%~3.8% cast iron chips, 4%Si, 0.2%Re Composition, the time of hot-dipping aluminum is 25 minutes, and an aluminized layer with a thickness of 70 μm to 80 μm is forme...

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Abstract

The diffusion connecting method for dissimilar non-ferrous metals, such as titanium and aluminum, belongs to the field of material processing technology. The connection process includes the following steps: 1. plating assisting treatment of the surface of metal titanium; 2. aluminum immersing treatment of the surface of metal titanium; 3. cleaning treatment of the surface of metal titanium; 4. cleaning treatment of the surface of metal aluminum to be connected; 5. superposing titanium and aluminum and assembling connecting part; and 6. vacuum diffusion connecting. The connection process is simple, low in cost and high in connecting effect and the present invention provides one new way for the connection between dissimilar non-ferrous metals.

Description

technical field [0001] The invention relates to a diffusion bonding method between dissimilar metals, in particular to a diffusion bonding method of titanium and aluminum dissimilar non-ferrous metals, and belongs to the technical field of material processing. Background technique [0002] Titanium and its alloys have the characteristics of small linear expansion coefficient and elastic modulus, strong corrosion resistance, etc., and their application scope involves aerospace, communications, chemical industry, energy, ships, automobiles and many other fields, among which the aerospace field is the most widely used. Aluminum alloy has become the main structural material in aircraft manufacturing, communication, shipbuilding and automobile production due to its advantages of high specific strength, low density and good plasticity. [0003] Due to the wide application of titanium, aluminum and their alloys and the requirements for some special performance parts, it is necessar...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K20/14B23K20/02B23K20/24B23K20/26B23K20/22C23C2/12
Inventor 王娟李亚江夏春智张永兰
Owner SHANDONG UNIV
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