Process of preparing calcium-adding fireproof magnesium alloy in magnetic field

A magnesium alloy and magnetic field technology, which is applied in the field of preparation to improve the mechanical properties of magnesium alloys, can solve problems such as the inability to prevent the burning of magnesium alloy melts, the inability to use the ignition point of calcium-magnesium alloys, and the deterioration of mechanical properties of magnesium alloys, etc., to achieve strength indicators. Inexpensive, smooth effect of liquid pocket

Inactive Publication Date: 2006-10-18
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although studies have shown that a small amount of calcium (calcium content less than 0.5wt%) can refine the as-cast structure and improve creep properties, but adding a small amount of calcium cannot prevent the combustion of the magnesium alloy melt
A large number of studies have confirmed that when the calcium content is greater than 0.5wt%, the mechanical properties of the magnesium alloy will deteriorate sharply with the increase of the calcium content. Reduce the mechanical properties of magnesium alloys, so that calcium can not be used to improve the ignition point of magnesium alloys
Therefore, the flame retardancy of calcium has not been practically applied.

Method used

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  • Process of preparing calcium-adding fireproof magnesium alloy in magnetic field

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Put a magnesium alloy (AZ91D) in a crucible, put it into a pit furnace, heat it to 720°C and keep it warm until the raw material melts, add about 3wt% of calcium and stir it evenly and keep it warm, add hexachloroethane for refining and degassing, and then Pouring into the mold, the mold is placed in the magnetic field generating device. After pouring, turn on the magnetic field generating device to solidify the alloy under the action of the magnetic field, air-cool under atmospheric conditions, turn off the magnetic field generating device after solidification, and demould.

[0025] The chemical composition (wt%) of AZ91D alloy is shown in Table 1:

[0026] Al

Zn

mn

be

Si

Cu

Fe

Ni

Mg

9.03

0.64

0.33

0.0014

0.031

0.0049

0.0011

0.0003

balance margin

[0027] By adopting the method of the invention, under the action of a magnetic field of 0.6 tesla, adding 3wt% calcium...

Embodiment 2

[0033] Put a certain amount of AE42 magnesium alloy in a crucible, put it into a pit furnace and heat until the raw material melts, then add about 2wt% of calcium, stir evenly, and keep warm at 720°C for 20 minutes. After degassing and refining, pour it into a mold, and air-cool under atmospheric conditions, and solidify under the action of a 0.5T magnetic field. After adding 2wt% calcium, the AE42 magnesium alloy did not burn during melting and pouring. Under the action of the magnetic field, the room temperature tensile strength of the AE42 alloy after calcium addition increased by about 120% compared with the AE42 alloy without magnetic field treatment, and increased by about 20% compared with the general cast AE42 alloy, and its high temperature mechanical properties Also increased by 10-20%.

Embodiment 3

[0035] Put a certain amount of MB1 magnesium alloy in a crucible, put it into a pit furnace and heat until the raw material melts, then add about 4wt% of calcium, stir evenly, and keep it warm at 720°C for 20 minutes. After degassing and refining, pour it into a mold, and air-cool under atmospheric conditions, and solidify under the action of a 0.35T magnetic field. After adding 4wt% calcium, the MB1 magnesium alloy did not burn during melting and pouring. Under the action of the magnetic field, the room temperature tensile strength of the MB1 alloy after calcium addition increased by about 100% compared with the MB1 alloy without magnetic field treatment, and increased by about 10% compared with the general cast MB1 alloy, and its high temperature mechanical properties Also increased by 5 to 10%.

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Abstract

The present invention relates to preparation process of magnesium alloy with raised mechanical performance, and is especially preparation process of calcium-adding fireproof magnesium alloy in magnetic field. During smelting, calcium in the amount of 2-5 wt% of the alloy is added into magnesium alloy to avoid oxidation and burning of the alloy during smelting and casting, and the alloy melt is solidified in magnetic field of 0.2-1.0 T to avoid oxidation and burning of the alloy during smelting and casting and raise the strength and plasticity of the alloy. The present invention has simple apparatus and convenient operation and can raise the mechanical performance of magnesium alloy at normal temperature and high temperature.

Description

technical field [0001] The invention relates to a preparation method for improving the mechanical properties of magnesium alloys, and in particular provides a magnetic field preparation method for calcium-added flame-retardant magnesium alloys, which can greatly improve the mechanical properties of calcium-added flame-retardant magnesium alloys in cast state. Background technique [0002] Compared with steel, aluminum alloy, engineering plastics and other materials, magnesium alloy shows some very obvious performance advantages such as light weight, high damping, vibration resistance, high thermal conductivity, anti-electromagnetic interference, high electronegativity and easy recycling. Magnesium alloys have received more and more attention in the fields of vehicles, 3C products, anode materials, etc., and are considered to be the "green materials" with the most potential for development and application in the 21st century. [0003] The difficulty in the preparation of magn...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C23/00
Inventor 杨院生唐军立周全胡壮麒
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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