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Complex flame-retarding and modifying process for Mg alloy

A composite flame retardant and magnesium alloy technology, applied in the field of metal materials, can solve the problems of complex production process, complex equipment, difficulty in adding carbon, etc., and achieve the effects of obvious metamorphism, low production cost and good remelting.

Inactive Publication Date: 2003-01-15
UNIV OF JINAN +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

SF 6 The gas protection effect is better, but there are the following problems: (1) pollute the environment, SF 6 The use of gas produces SO 2 , SF 4 and other toxic gases, SF 6 The contribution to global warming is CO 2 24900 times; (2) The equipment is complex
However, due to the poor solubility of carbon in magnesium, it is very difficult to add carbon to the magnesium alloy solution, which makes the production process complicated and the effect unstable

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] The AZ91 cast magnesium alloy (9% Al, 1% Zn, 0.15% Mn, the rest is Mg) of the national brand in No. 2 flux (38-46% magnesium chloride, 34-40% potassium chloride, 5-8% chloride Barium, 3-5% calcium fluoride) are covered and melted into liquid, and the alloy melting is carried out in a resistance furnace. Add 0.2% of a composite flame retardant modifier composed of 8% barium, 1% beryllium, 10% strontium and 91% aluminum, stir the alloy liquid, remove the slag and No. 2 flux, and then use dehydrated argon to make 5 Minutes of blowing and stirring, after that, 7 minutes of static inoculation at a temperature of 730°C, and finally, the slag of the alloy liquid is poured into the metal mold. The results of use show that after the flame-retardant modification treatment, the ZA91 magnesium alloy does not burn at a temperature of 770°C. Compared with the traditional flux-covered smelting process, the quality of castings is significantly improved due to the reduction of oxidatio...

Embodiment 2

[0017] The national brand AZ63 cast magnesium alloy (6% Al, 3% Zn, 0.35% Mn, the rest is Mg) is melted into a liquid under the protection of No. 2 flux, and the melting is carried out in a resistance furnace. Add 0.5% of a composite flame retardant modifier composed of 6% barium, 1% beryllium, 6% strontium and 87% aluminum, stir the alloy liquid, remove the slag and No. 2 flux, and then use dehydrated nitrogen for 5 minutes blowing and stirring, after that, 5 minutes of static inoculation at a temperature of around 750°C, and finally, the alloy liquid is slag-cast and cast into metal molds. The smelting results show that the burning point temperature of the ZA63 magnesium alloy solution can be increased to 790°C after the flame-retardant modification treatment. Compared with the traditional flux-covered smelting process, the new process reduces the oxidation and flux slag inclusion, which significantly improves the casting quality and reduces the environmental pollution caused...

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Abstract

A fire-retarding and modifying technology for Mg alloy includes smelting the cast Mg alloy under the covering protection of flux, adding fire-retarding modifier, stirring, removing float slags and covering agent, blowing argon gas while stirring, inocualting at 710-770 deg.c and casting. Its advantages are not oxidizing combustion in atmosphere under 800 deg.C, and fine alloy structure.

Description

1. Technical field [0001] The invention belongs to the field of metal materials, and in particular relates to a composite flame-retardant modification process for magnesium alloys. 2. Background technology [0002] In the process of magnesium alloy smelting, because magnesium is extremely easy to oxidize and burn, protective measures must be taken for the magnesium alloy liquid during smelting and before pouring. At present, the main methods used are protective flux covering method and gas protection method. The flux protection method is to use a certain composition of low melting point compound flux, which melts into a liquid state at a relatively low temperature and spreads on the surface of the magnesium alloy liquid to prevent the contact between the magnesium liquid and the air and thus play a protective role. The flux protection method is likely to cause pollution of the magnesium alloy liquid, increase inclusions in castings, corrode production equipment, and pollute ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/06C22C23/02
Inventor 耿浩然亓效刚
Owner UNIV OF JINAN
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