Calcium and cerium added flame-retardant magnesium alloy and preparation method thereof

A magnesium alloy and calcium addition technology, which is applied in the field of cerium flame-retardant magnesium alloy and its preparation and calcium addition, can solve the problems of harm to the human body, decreased toughness, thermal cracking, etc., and achieve the effects of cost saving, good metamorphism and refinement effect

Active Publication Date: 2013-10-09
HEBEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The Be element is added in the invention patent. The addition of Be will make the magnesium alloy crystal grains coarse, and the shape, toughness will drop sharply and the tendency of thermal cracking; in addition, Be has certain toxicity, which is not only harmful to human body, but also harmful to the waste slag. surroundings

Method used

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  • Calcium and cerium added flame-retardant magnesium alloy and preparation method thereof
  • Calcium and cerium added flame-retardant magnesium alloy and preparation method thereof
  • Calcium and cerium added flame-retardant magnesium alloy and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] 1. To prepare the components of AZ91D-2.5Ca-1.2Ce (wt.%), weigh 289.75g of magnesium ingot with a purity of 99.99%, 31.01g of an aluminum ingot with a purity of 99.95%, and 2.70g of a zinc ingot with a purity of 99.95%. , 1.18g of manganese ingot with a purity of 99.99%, 30.94g of Mg-29.9Ca (wt.%) master alloy, 14.42g of Mg-30.8Ce (wt.%) master alloy (the master alloy materials involved in the present invention are all purchased from Hunan Institute of Nonferrous Metals);

[0027] 2. Set the heating temperature of the crucible resistance furnace to 750°C. When the crucible is preheated to 500°C, add the pre-weighed magnesium ingots in step 1 to the crucible, and then make the crucible at a volume percentage of 99.5% CO 2 and 0.5% SF 6 Put it into the resistance furnace under the atmosphere of mixed protective gas, and add other pre-weighed raw materials after the magnesium ingots are completely melted;

[0028] 3. After all the raw materials in the crucible are melted...

Embodiment 2

[0033] 1. To prepare the components of AZ91D-2.2Ca-1.0Ce (wt.%), weigh 294.93g of magnesium ingot with a purity of 99.99%, 32.00g of an aluminum ingot with a purity of 99.95%, and 2.66g of a zinc ingot with a purity of 99.95%. , 1.18g of manganese ingot with a purity of 99.99%, 27.22g of Mg-29.9Ca (wt.%) master alloy, and 12.01g of Mg-30.8Ce (wt.%) master alloy;

[0034] 2. Set the heating temperature of the crucible resistance furnace to 750°C. When the crucible is preheated to 500°C, add the pre-weighed magnesium ingots in step 1 to the crucible, and then make the crucible at a volume percentage of 99.5% CO 2 and 0.5% SF 6 Put it into the resistance furnace under the atmosphere of mixed protective gas, and add other pre-weighed raw materials after the magnesium ingots are completely melted;

[0035] 3. After all the raw materials in the crucible are melted, stir the magnesium alloy melt, remove the dross on the surface of the melt, control the temperature at 710~720°C and l...

Embodiment 3

[0039] 1. To prepare the components of AZ91D-2.3Ca-1.1Ce (wt.%), weigh 291.55g of magnesium ingot with a purity of 99.99%, 32.93g of an aluminum ingot with a purity of 99.95%, and 2.74g of a zinc ingot with a purity of 99.95%. , 1.11g of manganese ingot with a purity of 99.99%, 28.46g of Mg-29.9Ca (wt.%) master alloy, and 13.21g of Mg-30.8Ce (wt.%) master alloy;

[0040] 2. Set the heating temperature of the crucible resistance furnace to 750°C. When the crucible is preheated to 500°C, add the pre-weighed magnesium ingots in step 1 to the crucible, and then make the crucible at a volume percentage of 99.5% CO 2 and 0.5% SF 6 Put it into the resistance furnace under the atmosphere of mixed protective gas, and add other pre-weighed raw materials after the magnesium ingots are completely melted;

[0041] 3. After all the raw materials in the crucible are melted, stir the magnesium alloy melt, remove the dross on the surface of the melt, control the temperature at 710~720°C and l...

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Abstract

The invention discloses a calcium and cerium added flame-retardant magnesium alloy and a preparation method thereof. The flame-retardant magnesium alloy comprises the following elements in percentage by mass: 85.90-88.03% of Mg, 8.18-9.15% of Al, 0.43-0.87% of Zn, 0.16-0.38% of Mn, 2.20-2.50% of Ca, 1.00-1.20% of Ce. The preparation method of the alloy is implemented through compositely adding Mg (29.9wt% of Ca)-Mg (30.8wt% of Ce) intermediate alloy into an AZ91D magnesium alloy melt, so that a dense protective oxide film is generated on the surface of the magnesium alloy melt, thereby preventing the alloying approach of magnesium alloy burning; the magnesium alloy can be smelted under the condition of no fusing agent or gas protection measures. Through carrying out an appropriate heat treatment process on a magnesium alloy sample, the cast magnesium alloy disclosed by the invention both has good flame retardant properties and good mechanical properties.

Description

technical field [0001] The invention relates to a flame-retardant magnesium alloy and a preparation method thereof, in particular to a calcium- and cerium-added flame-retardant magnesium alloy and a preparation method thereof, belonging to the technical field of nonferrous metal preparation methods. Background technique [0002] Magnesium alloy material is considered to be the "green material" with the most development and application potential in the 21st century. It has high specific strength, specific stiffness, excellent demagnetization and shock absorption, and is easy to cut and form. Therefore, it is used in aerospace, automobile Industry, electronic technology and other fields have broad application prospects. However, magnesium alloys are easy to oxidize and burn during the melting and pouring process, so certain protective measures must be taken. In view of the shortcomings of magnesium alloys that are easy to oxidize and burn, researchers at home and abroad have ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C23/02C22C1/03C22F1/06
Inventor 丁俭赵维民秦林方正李永艳王志峰
Owner HEBEI UNIV OF TECH
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