Diffusion brazing connecting method for contact reaction of magnesium alloy and steel

A technology of contact reaction and connection method, which is applied in the direction of welding/welding/cutting objects, welding equipment, metal processing equipment, etc., and can solve the problem of unsatisfactory interface bonding strength and other problems

Inactive Publication Date: 2014-10-08
山东高熵金属科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the tensile fracture position is at the interface of magnesium steel, indicating that the bonding strength of the interface is not ideal

Method used

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  • Diffusion brazing connecting method for contact reaction of magnesium alloy and steel
  • Diffusion brazing connecting method for contact reaction of magnesium alloy and steel
  • Diffusion brazing connecting method for contact reaction of magnesium alloy and steel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] 1) Cut the AZ31B magnesium alloy and 08F steel into rectangular strips of 30×10×3mm, and drill a small hole of Φ2.5mm at a distance of 2 to 3mm from the end of the magnesium alloy (to prepare the magnesium alloy micro-arc oxidation layer), Polish the outer surface of the magnesium alloy with 800# sandpaper until the surface is flat and shiny, then ultrasonically clean it in acetone solvent for 10 minutes, and wipe it to dry;

[0032] 2) Grind the 08F steel with 800# sandpaper until the surface is smooth and metallic, then ultrasonically clean it in acetone solvent for 10 minutes, and wipe it to dry;

[0033] 3) Prepare the micro-arc oxidation layer on the six surfaces of the polished magnesium alloy by the method of micro-arc oxidation, and the specific micro-arc oxidation parameters (control voltage is 415V, pulse frequency is 400Hz, duty cycle is 3%, micro-arc time 5min; the configured electrolyte is 15L, and its specific ratio is 4g / L sodium silicate, 8g / L potassium ...

Embodiment 2

[0040] The difference between this example and Example 1 is that in step 7, after the temperature was raised to 530° C., the temperature was kept for 40 minutes. Others are the same as in Embodiment 1.

[0041] AZ31B magnesium alloy / Cu / 08F steel contact reaction diffusion brazed joints were obtained, with the highest shear strength of 20.3MPa.

Embodiment 3

[0043] The difference between this example and Example 1 is that in step 7, after the temperature was raised to 530° C., the temperature was kept for 60 minutes. Others are the same as in Embodiment 1.

[0044] AZ31B magnesium alloy / Cu / 08F steel contact reaction diffusion brazed joints were obtained, with the highest shear strength of 39.6MPa.

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Abstract

The invention discloses a diffusion brazing connecting method for a contact reaction of magnesium alloy and steel, and belongs to the field of dissimilar material connection. The melting point of the magnesium alloy is 650 DEG C only, and the magnesium alloy is sensitive to the welding temperature. Magnesium and steel are dissimilar materials. Particularly, the melting points and the linear expansion coefficients of the two dissimilar materials remarkably differ from each other, so that the welding difficulty of the magnesium and the steel is increased. The diffusion brazing connecting method comprises the steps that an intermediate pure copper layer is manufactured on the surface of the magnesium alloy, so that the magnesium alloy/Cu/steel brazing structure is formed in a combined mode; the magnesium alloy/Cu/steel brazing structure is fixedly arranged inside a vacuum diffusion furnace, the pressure of junction surfaces ranges from 0.0375 MPa to 0.2 MPa, the magnesium alloy/Cu/steel brazing structure is heated, the temperature of the magnesium alloy/Cu/steel brazing structure is kept constant, then, the magnesium alloy/Cu/steel brazing structure is reheated, the temperature of the magnesium alloy/Cu/steel brazing structure is kept constant, heating is stopped, the magnesium alloy/Cu/steel brazing structure is cooled with the furnace until the temperature of the magnesium alloy/Cu/steel brazing structure is smaller than 150 DEG C, and diffusion brazing connection of the contact reaction of the magnesium alloy and the steel is achieved. According to the diffusion brazing connecting method, the welding temperature is lower, the influence on the parent metal is small, no brazing filter metal is needed, the large surrounding and small surrounding phenomena are avoided, the aim that no defects (relative fusion welding) exist in brazing joints of welding of the magnesium alloy and the dissimilar metal is achieved to a certain degree, and the shearing strength of the brazing joints at indoor temperature can reach 39.6 MPa.

Description

technical field [0001] The invention belongs to the technical field of connection of dissimilar materials, and in particular relates to a contact reaction diffusion brazing connection method of magnesium alloy and steel. Background technique [0002] Magnesium alloy is currently the lightest metal structural material in practical application, and is called "green engineering and environmental protection material in the 21st century". Because it has a small density (only 1.74g / cm 3 ), high specific strength and specific stiffness, good shock absorption and anti-magnetic properties, easy cutting and recycling and other advantages, it has extremely important application value in industrial fields such as automobiles, electronics, electrical appliances, transportation, aviation, aerospace and national defense. and outlook. However, the application of magnesium alloys will inevitably encounter problems with the connection with steel, so it is particularly urgent to develop effi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K1/008B23K1/20
CPCB23K1/008B23K1/19B23K1/20B23K2103/18
Inventor 李红龙伟民聂海杰钟素娟陈卓裴艳虎
Owner 山东高熵金属科技有限公司
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