A kind of medium temperature magnesium alloy solder containing rare earth element Ia and preparation method thereof

A rare earth element and magnesium alloy technology, applied in metal processing equipment, manufacturing tools, welding equipment, etc., to achieve the effects of expanding the application range, lowering the melting point temperature, and reducing burning loss

Active Publication Date: 2017-01-18
ZHENGZHOU RES INST OF MECHANICAL ENG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In recent years, Mg-Zn-Al solder has been used in the welding of AZ magnesium alloys, but the strength of its welded joints needs to be further improved

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Prepare 500g of La-containing magnesium alloy solder of the present invention:

[0030] Preheat the crucible to 150 °C ~ 300 °C, add 275 g of Mg to the crucible, in SF 6 +CO 2 Heating to 700°C~720°C under a protective atmosphere; after the magnesium ingot is completely melted, remove the slag, add 25 grams of pure Al and 25 grams of Mg-20%La master alloy, stir and keep warm for 10 minutes; add 175 grams of pure Zn, After stirring until completely melted, remove the slag and let it stand for 15 minutes; pour the alloy liquid into a cast iron mold, and air-cool to room temperature to obtain the finished solder of Example 1.

Embodiment 2

[0032] Prepare 500g of La-containing magnesium alloy solder of the present invention:

[0033] Preheat the crucible to 150 °C ~ 300 °C, add 252.5 g of Mg to the crucible, in SF 6 +CO 2 Heating to 700°C~720°C under a protective atmosphere; after the magnesium ingot is completely melted, remove the slag, add 35 grams of pure Al and 37.5 grams of Mg-20%La master alloy, stir and keep warm for 10 minutes; add 175 grams of pure Zn, After stirring until completely melted, remove the slag and let it stand for 15 minutes; pour the alloy liquid into a cast iron mold, and air-cool to room temperature to obtain the finished solder of Example 2.

Embodiment 3

[0035] Prepare 500g of La-containing magnesium alloy solder of the present invention:

[0036] Preheat the crucible to 150°C~300°C, add 200 g of Mg to the crucible, 6 +CO 2 Heating to 700°C~720°C under a protective atmosphere; after the magnesium ingot is completely melted, remove the slag, add 50 grams of pure Al and 50 grams of Mg-20%La master alloy, stir and keep warm for 10 minutes; add 200 grams of pure Zn, After stirring until completely melted, remove the slag and let it stand for 15 minutes; pour the alloy liquid into a cast iron mold, and air-cool to room temperature to obtain the finished solder of Example 3.

[0037] A DSC200PC differential thermal analyzer was used to measure the melting point of the above solder. Test parameters: pure argon protection, gas flow Ar=15ml / min; heating rate 10.0K / min; Al 2 o 3 For reference; the sample is 10-15 mg of solder fine particles or powder. The following table 1 lists the solder melting points of Comparative Examples and...

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PUM

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Abstract

The invention discloses medium-temperature magnesium alloy solder containing rare earth element La. The solder comprises, by weight, 0.2-2.5% of La, 5-10% of Al, 35-40% of Zn and the balance Mg. A preparing method of the solder includes the steps that intermediate alloy Mg-La is smelted; a crucible is preheated to 150-300 DEG C, remaining magnesium ingot is placed in the crucible and heated to 700-720 DEG C in a protective atmosphere, slag is taken out after the magnesium ingot completely melts, pure Al and the intermediate alloy Mg-La are added, and stirring and heat preservation are carried out; pure Zn is added, the mixture is stirred until the mixture completely melts, slag is taken out and the mixture stands still; alloy liquid is poured into a die and cooled to room temperature through air, and the solder can be obtained. Melting temperature of the solder is remarkably lowered, plasticity and room temperature strength of the solder are improved, high-temperature mechanical properties of a soldering joint is improved, burning of alloy elements is obviously reduced, and components and the structure of the obtained solder are very uniform.

Description

technical field [0001] The invention relates to a magnesium alloy brazing filler metal, in particular to a medium-temperature magnesium alloy brazing filler metal containing a rare earth element La, and also relates to a preparation method of the brazing filler metal. Background technique [0002] Magnesium alloy is currently the metal structure material with the lowest density. It has a series of advantages such as high specific strength, strong vibration damping, electromagnetic shielding and radiation resistance, easy cutting, easy recycling, etc., so it has attracted more and more attention. It has extremely important application value and broad application prospects in the fields of electronics, transportation, automobiles, aviation, aerospace, and national defense. Therefore, the research on the connection of magnesium alloys has attracted more and more attention. [0003] As a joining technology, brazing can well expand the application fields of magnesium alloys. How...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K35/28B23K35/40
CPCB23K35/284C22C1/03
Inventor 龙伟民钟素娟黄小勇朱坤张青科沈元勋黄俊兰裴夤崟于新泉马力
Owner ZHENGZHOU RES INST OF MECHANICAL ENG CO LTD
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