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Method for preparing foamed magnesium alloy through secondary foaming

A foaming magnesium alloy and foaming technology, which is applied in the field of secondary foaming to prepare foamed magnesium alloys, can solve the problems of restricting the application of foamed magnesium and not being suitable for the preparation of special-shaped parts, and is conducive to large-scale production and has an obvious flame retardant effect , Improve the effect of compressive strength

Inactive Publication Date: 2017-02-01
郑州峰泰纳米材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it is not suitable for preparing special-shaped parts with complex shapes, which limits the application of foamed magnesium

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] A method for preparing foamed magnesium alloy by secondary foaming, comprising the following steps:

[0018] 1) Heat the magnesium until it melts, and adjust the temperature to 700°C, add a tackifier accounting for 0.5% of the mass fraction of the magnesium solution, and stir at 600rpm for 5 minutes. The tackifier is composed of 45wt% calcium oxide and 55wt% magnesium carbonate. The adhesive is prepared by grinding calcium oxide and magnesium carbonate;

[0019] 2) Cool the melt obtained in step 1) to 580°C, add calcium carbonate powder accounting for 2% of the mass fraction of the magnesium solution, rotate at 800 rpm, stop stirring for 3 minutes, cool to 300°C and keep for 20 minutes;

[0020] 3) The temperature is raised to 800° C. to cause secondary thermal decomposition of calcium carbonate in the billet to produce secondary foaming. After stirring evenly, water-cool to room temperature to obtain a foamed magnesium alloy.

Embodiment 2

[0022] A method for preparing foamed magnesium alloy by secondary foaming, comprising the following steps:

[0023] 1) Heat the magnesium until it melts, and adjust the temperature to 720°C, add a tackifier accounting for 1.5% of the mass fraction of the magnesium solution, and stir at a speed of 700rpm for 10min. The tackifier is composed of 60wt% calcium oxide and 40wt% magnesium carbonate. The adhesive is prepared by grinding calcium oxide and magnesium carbonate;

[0024] 2) Cool the melt obtained in step 1) to 590°C, add calcium carbonate powder accounting for 4% of the mass fraction of the magnesium solution, rotate at 1000rpm, stop stirring for 4 minutes, and cool to 360°C for 24 minutes;

[0025] 3) The temperature is raised to 820° C. to cause secondary thermal decomposition of calcium carbonate in the billet to produce secondary foaming. After stirring evenly, water-cool to room temperature to obtain a foamed magnesium alloy.

Embodiment 3

[0027] A method for preparing foamed magnesium alloy by secondary foaming, comprising the following steps:

[0028] 1) Heat the magnesium until it melts, and adjust the temperature to 740°C, add a tackifier accounting for 2.2% of the mass fraction of the magnesium solution, and stir at 750rpm for 12min. The tackifier is composed of 50wt% calcium oxide and 50wt% magnesium carbonate. The adhesive is prepared by grinding calcium oxide and magnesium carbonate;

[0029] 2) Cool the melt obtained in step 1) to 600°C, add calcium carbonate powder accounting for 8% of the mass fraction of the magnesium solution, rotate at 1200rpm, stop stirring for 6 minutes, cool to 480°C and keep for 28 minutes;

[0030] 3) Raise the temperature to 860° C. to cause secondary thermal decomposition of calcium carbonate in the billet to produce secondary foaming. After stirring evenly, water-cool to room temperature to obtain a foamed magnesium alloy.

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Abstract

The invention provides a method for preparing a foamed magnesium alloy through secondary foaming. The method includes the following steps that firstly, magnesium is heated till being molten, the temperature is regulated to 700 DEG C to 750 DEG C, a tackifier accounting for, by mass, 0.5%-3.0% of the molten magnesium is added, and stirring is conducted for 5 min to 15 min at the rotating speed ranging from 600 rpm to 800 rpm, wherein the tackifier is composed of 40 wt%-60 wt% of calcium oxide and 30 wt%-55 wt% of magnesium carbonate; secondly, the melt obtained in the first step is cooled to 580 DEG C to 620 DEG C, calcium carbonate powder accounting for, by mass, 2%-10% of the molten magnesium is added, stirring is stopped after being conducted for 3 min to 7 min at the rotating speed ranging from 800 rpm to 1500 rpm, the temperature is lowered to 300 DEG C to 500 DEG C, and heat preservation is conducted for 20 min to 30 min; and thirdly, the temperature then rises to 800 DEG C to 900 DEG C so that the calcium carbonate in a blank can be subjected to secondary thermal decomposition and secondary foaming, after the mixture is stirred to be uniform, water cooling is conducted till the room temperature is achieved, and the foamed magnesium alloy is obtained. The foamed magnesium alloy prepared through the method can be used for preparing special-shaped pieces complex in appearance, and is uniform in pore size distribution and good in flame retardant property.

Description

technical field [0001] The invention belongs to the technical field of foam metal preparation, and in particular relates to a method for preparing a foamed magnesium alloy through secondary foaming. Background technique [0002] Metal foam is a metal material with millimeter or submillimeter micropores in the matrix. It has the characteristics of low density, high specific strength, easy processing, heat resistance, sound insulation, heat insulation, electromagnetic shielding and high damping. In addition, magnesium alloy, as the lightest structural material currently used, has the advantages of low density, high specific strength, low elastic modulus, good electromagnetic shielding and excellent casting processing performance, and combines the advantages of foam metal and magnesium alloy. Foamed magnesium alloys have great application potential. Nevertheless, the metal foam material that is currently being studied and applied more is still aluminum foam, and there are not ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/08C22C23/00
CPCC22C1/08C22C23/00C22C1/086
Inventor 李洋洋
Owner 郑州峰泰纳米材料有限公司
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