Method for preparing magnesium alloy solder

A technology of magnesium alloy and brazing filler metal, which is applied in metal processing equipment, manufacturing tools, welding equipment, etc., can solve the problem of mixing impurities in magnesium alloy brazing filler metal, uneven distribution of trace alloy elements of alloy elements, and coarse magnesium alloy brazing filler metal grains, etc. problems, to achieve the effect of reducing inclusion content, uniform distribution and segregation improvement

Inactive Publication Date: 2011-05-25
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] The purpose of the present invention is to solve the problems of coarse grains of magnesium alloy solder, uneven distribution of alloy elements, especially trace alloy elements, and impurities mixed into magnesium alloy solder, and provide a preparation method of magnesium alloy solder, which can be used in the melting of magnesium alloy Preparation of magnesium alloy brazing filler metal by applying ultrasonic wave in brazing filler metal

Method used

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  • Method for preparing magnesium alloy solder

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Embodiment 1

[0026] Preheat the crucible to 100 °C. Sprinkle 60g covering agent on the bottom of the crucible, the composition of the covering agent is 35wt% BaCl 2 , 30%wt% LiCl, 10.0wt% KCl and 25wt% CaF 2 . Put 50g of magnesium ingot and 950g of zinc ingot in the crucible. Heating to 700°C under protective atmosphere and mechanical stirring conditions and then keeping it warm. After the alloy is completely melted, remove the slag, stir for 2 minutes and then cool down. After the melt temperature drops to 680°C, keep it warm. Insert the ultrasonic rod preheated to 680°C into the molten magnesium alloy solder, and immerse the ultrasonic rod about 5mm below the alloy liquid surface. , and then apply ultrasonic waves, the ultrasonic frequency is 18kHz, and the ultrasonic intensity is 0.5W / cm 2 , the time is 10s. After the treatment, the ultrasonic rod was removed, and the alloy solution was left to stand for 5s, and poured into a stainless steel mold after the temperature dropped to 67...

Embodiment 2

[0028] Preheat the crucible to 150 °C. Sprinkle 60g covering agent on the bottom of the crucible, the composition of the covering agent is 35wt% BaCl 2 , 30%wt% LiCl, 10.0wt% KCl and 25wt% CaF 2 . Put 500g of magnesium ingots and 500g of zinc ingots into the crucible, and sprinkle 60g of covering agent. Heating to 700°C under protective atmosphere and mechanical stirring conditions and then keeping it warm. After the alloy is completely melted, remove the slag, stir for 3 minutes and then cool down. The melt temperature drops to 680°C and then keep warm. Insert the ultrasonic rod preheated to 680°C into the molten magnesium alloy solder, and immerse the ultrasonic rod about 10mm below the alloy liquid surface. , and then apply ultrasonic waves, the ultrasonic frequency is 19kHz, and the ultrasonic intensity is 0.8W / cm 2 , the time is 20s. After the treatment, the ultrasonic rod was removed, and the alloy liquid was left to stand for 20s, and poured into a stainless steel ...

Embodiment 3

[0030] Preheat the crucible to 180 °C. Sprinkle 60g covering agent on the bottom of the crucible, the composition of the covering agent is 35wt% BaCl 2 , 30%wt% LiCl, 10.0wt% KCl and 25wt% CaF 2 . Put 660g magnesium ingot, 72g aluminum ingot and 600g zinc ingot in the crucible. Heating to 720°C under protective atmosphere and mechanical stirring conditions and then keeping it warm. Remove the slag after the alloy is completely melted, cool down after stirring for 4 minutes, keep the melt temperature down to 680°C and keep it warm, insert the ultrasonic rod preheated to 680°C into the molten magnesium alloy solder, and immerse the ultrasonic rod about 10mm below the alloy liquid surface , and then apply ultrasonic waves, the ultrasonic frequency is 20kHz, and the ultrasonic intensity is 1W / cm 2 , the time is 30s. After the treatment, the ultrasonic rod was removed, and the alloy liquid was left to stand for 50s, and poured into a stainless steel mold after the temperature ...

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Abstract

The invention discloses a method for preparing a magnesium alloy solder, which comprises the following steps of: preheating a crucible or a smelting furnace, spreading a covering agent, and heating an alloy ingot in protective atmosphere to the temperature which is 50 to 150 DEG C higher than the prepared solder liquid phase line; melting the alloy ingot, collecting slag, and stirring; applying ultrasonic waves to the melted magnesium alloy solder by adopting an ultrasonic generator, namely inserting a preheated ultrasonic rod to a position 5 to 50mm lower than the liquid surface of the melted magnesium alloy solder, wherein the difference between the preheating temperature of the ultrasonic rod and the melting temperature of the solder does not exceed 20 DEG C, the frequency of the ultrasonic waves is 18 to 22kHz, the intensity of the ultrasonic waves is 0.5 to 5W/cm<2> and the time is 0 to 150 seconds; moving the ultrasonic rod out, and standing alloy melt; and injecting the melted solder into a stainless steel mold, and cooling to room temperature to obtain the solder. Alloy elements, particularly microalloy elements are uniformly distributed, the crystals are fine, the toughness is improved, and the shearing strength of brazing lap joints is improved by 5 to 20 percent.

Description

technical field [0001] The invention belongs to the technical field of manufacturing magnesium alloy welding materials, and in particular relates to a preparation method of magnesium alloy series brazing materials. Background technique [0002] Magnesium alloy material is currently the lightest metal material in the application of structural metal materials. It has the advantages of small specific gravity, high specific strength, and easy recycling. It is widely used in aviation, aerospace, automobile manufacturing and electronic products, and is known as a green engineering structure. Material. In recent years, light metal materials represented by magnesium alloys have sprung up suddenly, with a continuous growth rate of 20% per year. The connection of magnesium alloys has become a research hotspot. [0003] Magnesium alloys widely used in industry at home and abroad mainly include the following four series: AZ series, such as Mg-Al-Zn; AM series, such as Mg-Al-Mn; AS ser...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C18/00C22C1/02C22C1/06B23K35/28
Inventor 李国栋栗卓新耿园月宋绍朋史传伟
Owner BEIJING UNIV OF TECH
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