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in-situ reinforced active liquid-phase diffusion welding method of aluminium base composite and three-element active solder of Al-Cu-Ti system

An aluminum-based composite material and in-situ strengthening technology, applied in the direction of welding/cutting medium/material, welding medium, welding equipment, etc., can solve problems such as unsatisfactory brazing seam structure, low strength of welded joints, embrittlement of brazing seam, etc. Achieve the effect of eliminating interfacial voids, segregation of ceramic particles, and dense interface

Inactive Publication Date: 2012-06-13
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0031] The purpose of the present invention is to overcome the unsatisfactory brazing seam structure of existing aluminum matrix composite materials (shown as either the brazing seam is embrittled due to too much particle segregation, or the brazing seam is weakened because there is no strengthening phase or too little strengthening phase) causing welding Low joint strength, a difficult problem that has not been solved for many years

Method used

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  • in-situ reinforced active liquid-phase diffusion welding method of aluminium base composite and three-element active solder of Al-Cu-Ti system
  • in-situ reinforced active liquid-phase diffusion welding method of aluminium base composite and three-element active solder of Al-Cu-Ti system
  • in-situ reinforced active liquid-phase diffusion welding method of aluminium base composite and three-element active solder of Al-Cu-Ti system

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Embodiment 1

[0070] Embodiment 1: Melting and preparation of Al-19Cu-1Ti

[0071] In this embodiment, the preparation method of Al-Cu-Ti ternary active solder for in-situ strengthened aluminum matrix composite materials can be realized, and the steps are as follows:

[0072] 1) material selection

[0073] The selected raw materials are: block pure Al, rod-shaped copper T2 and block Al-5Ti master alloy;

[0074] 2) Ingredients

[0075] Mix block shape Al-5Ti master alloy (6.84g), rod shape red copper T2 (6.5g) and block shape pure aluminum ingot (20.8g), make the mass percent of Cu in the mixture be 19%, to prevent ternary active solder The melting point is too high or brittle, the mass percentage of Ti is 1%, and the balance is Al; and the mixture is placed in the crucible;

[0076] 3) Smelting

[0077] First pass high-purity Ar (99.99%) into the crucible, and discharge the air in it; then, under the protection of Ar gas, use high-frequency induction heating to heat up to the melting t...

Embodiment 2

[0080] Embodiment 2: Melting and preparation of Al-33Cu-1Ti

[0081] In this embodiment, the preparation method of Al-Cu-Ti ternary active solder for in-situ strengthened aluminum matrix composite materials can be realized, and the steps are as follows:

[0082] 1) material selection

[0083] The selected raw materials are: block pure Al, rod-shaped copper T2 and block Al-5Ti master alloy;

[0084] 2) Ingredients

[0085] Block Al-5Ti master alloy (3.75g), rod-shaped red copper T2 (6.24g) and block-shaped pure aluminum ingot (8.9g) are mixed, make the mass percent of Cu in the mixture be 33%, to prevent ternary active solder The melting point is too high or brittle, the mass percentage of Ti is 1%, and the balance is Al; and the mixture is placed in the crucible;

[0086] 3) Smelting

[0087] First pass high-purity Ar (99.99%) into the crucible, and discharge the air in it; then, under the protection of Ar gas, use high-frequency induction heating to heat up to the melting...

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Abstract

The invention discloses an in-situ reinforced active liquid-phase diffusion welding method using a three-element active solder containing melting-point-rising active elements, and discloses an Al-Cu-Ti three-element active solder suitable for a cast-aluminium-based composite material. The method enables the interfaces of aluminium matrix / soldering seam and ceramic reinforced phase / soldering seam to be compact and can realize in-situ reinforcement for a soldering seam. Due to the capacity of realizing in-situ reinforcement for a soldering seam, the method has the prominent advantages that: on one hand, a soldering seam matrix becomes solid solution after melting-point-depressing elements diffuse to an aluminium matrix; on the other hand, the relative concentrations of the melting-point-rising active elements automatically rise in the soldering seam due to the difficulty to diffuse in the aluminium matrix of the melting-point-rising active elements, so that a submicron-sized or micron-sized three-element intermetallic compound reinforced phase containing the dispersive distribution of the melting-point-rising active elements is enough to be formed in situ in the soldering seam, thereby obtaining a high-quality soldering seam using the fine and infusible three-element intermetallic compound as a reinforced phase and using the solid solution as a matrix. When 10 Vol.% SiCp / ZL101 is welded at 550 DEG C, the shear performance achieves 99.7% of parent material; and a fracture can penetrate in the parent material and is not completely located in the interface.

Description

Technical field: [0001] The invention relates to an aluminum-based composite material welding method and the used welding material—brazing filler metal. In particular, a method of "in situ enhanced active liquid phase diffusion welding" (In situ A-TLP) using a ternary active solder containing melting-type active elements was proposed; Composition design results and preparation methods of the Al-Cu-Ti system ternary active solder of the new process. Background technique: [0002] As the low-cost technology for the preparation of aluminum matrix composites becomes more and more mature, the commercial scope of aluminum matrix composites is becoming more and more extensive. The current main preparation methods are: stirring casting, squeeze casting, pressureless impregnation, powder metallurgy and so on. Among them, stirring casting is widely accepted because of its low cost and easy operation. SiCp / ZL101 aluminum matrix composite material can be prepared by stir casting or s...

Claims

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Application Information

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IPC IPC(8): B23K1/00B23K35/28B23K35/40
Inventor 张贵锋廖先金张建勋
Owner XI AN JIAOTONG UNIV
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