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A kind of in-situ particle reinforced magnesium matrix composite material and its preparation method

A particle-reinforced, composite material technology, which is applied in the field of in-situ aluminum nitride particle-reinforced magnesium-based composite materials, in-situ particle-reinforced magnesium-based composite materials and their preparation fields, can solve the problems affecting the improvement of the overall performance of the magnesium-based composite materials. Unfavorable for large-scale industrial production, slow reaction speed of aluminum nitride particles, etc., to achieve the effects of low cost, simple method and high interface bonding strength

Active Publication Date: 2018-06-01
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the above-mentioned preparation method also has some problems and deficiencies, such as the preparation of aluminum nitride particle-reinforced magnesium-based composites by adding powder in-situ reaction, which has the disadvantages of slow reaction speed, incomplete reaction, and large aluminum nitride particle size. The preparation of aluminum nitride particle-reinforced magnesium-based composites by in-situ reaction with gas also has the disadvantages of nitrogen gas introduction and complex structure of the reaction device.
[0005] The shortcomings of the above-mentioned method for preparing in-situ aluminum nitride particle reinforced magnesium-based composite materials will affect the improvement of the structure and comprehensive performance of magnesium-based composite materials, and are not conducive to large-scale industrial production, so there are certain limitations

Method used

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  • A kind of in-situ particle reinforced magnesium matrix composite material and its preparation method
  • A kind of in-situ particle reinforced magnesium matrix composite material and its preparation method
  • A kind of in-situ particle reinforced magnesium matrix composite material and its preparation method

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Effect test

Embodiment 1

[0026] The preparation method of the in-situ particle-reinforced magnesium-based composite material in this embodiment is carried out according to the following steps:

[0027] (1) 500g magnesium alloy (composition is 6.0wt.%Al, 0.74wt.%Zn, 0.01wt.%Mn, 0.01wt.%Si, balance is Mg) alloy is put in crucible, under N 2 +SF 6 Heating and melting under the protection of mixed gas to liquid state.

[0028] (2) Control the magnesium alloy melt to 625°C (this temperature is 10°C higher than the liquidus of the melt), add 25g of anhydrous ammonium carbonate (purity is 95.0wt.%) to the melt, and use the stirring blade at 100rpm Stir the melt in the molten state for 5 min at a constant speed.

[0029] (3) Heating the temperature of the melt to about 680° C., scooping up slag on the surface of the melt, and casting it in a sand mold to obtain an in-situ aluminum nitride particle-reinforced magnesium-based composite material.

Embodiment 2

[0031] The preparation method of the in-situ particle-reinforced magnesium-based composite material in this embodiment is carried out according to the following steps:

[0032] (1) 500g of magnesium alloy (composition is 9.7wt.% Al, 1.1wt.% Zn, 0.02wt.% Mn, 0.01wt.% Si, the balance is Mg) alloy is placed in the crucible, in CO 2 +SF 6 Heating and melting under the protection of mixed gas to liquid state.

[0033] (2) Control the magnesium alloy melt to 693°C (this temperature is 100°C higher than the liquidus line of the melt), add 50g of anhydrous ammonium chloride (purity is 99.0wt.%) to the melt, and use the stirring blade to The melt in molten state was stirred at a speed of 500 rpm for 15 min.

[0034] (3) Heating the temperature of the melt to about 670° C., scooping up slag on the surface of the melt, and casting it in a metal mold to obtain an in-situ aluminum nitride particle-reinforced magnesium-based composite material.

Embodiment 3

[0036] The preparation method of the in-situ particle reinforced magnesium-based composite material in this embodiment is carried out according to the following steps:

[0037] (1) the magnesium alloy (composition is 18.5wt.% Al, 0.5wt.% Zn, 0.02wt.% Mn, 0.02wt.% Si, the balance is Mg) alloy of 500g is placed in the crucible, in N 2 +SF 6 Heating and melting under the protection of mixed gas to liquid state.

[0038] (2) Control the magnesium alloy melt to 585°C (this temperature is 30°C higher than the liquidus line of the melt), add 100g of anhydrous ammonium carbonate (purity is 99.5wt.%) to the melt, and use the stirring blade at 800rpm Stir the melt in molten state for 40min at a certain speed.

[0039] (3) Heating the temperature of the melt to about 600° C., scooping up slag on the surface of the melt, and casting it in a sand mold to obtain an in-situ aluminum nitride particle-reinforced magnesium-based composite material.

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Abstract

The invention discloses an in-situ particle reinforced magnesium-based composite material and a preparation method thereof, belonging to the technical field of metal-based composite material preparation. In the method, ammonium chloride, ammonium carbonate and other ammonium salts are added to the aluminum-containing magnesium alloy melt, and the in-situ aluminum nitride particle-reinforced magnesium-based composite material is finally obtained by controlling the reaction temperature, stirring intensity and time. The particle size of the in-situ generated aluminum nitride is evenly distributed, there is no interfacial reaction with the matrix, and the amount of generation is controllable. The method has simple process, short process and low cost, can be used in mass industrial production, and has broad application prospects in aerospace, automobile, 3C and other fields.

Description

Technical field: [0001] The invention relates to an in-situ particle-reinforced magnesium-based composite material and a preparation method thereof, in particular to a method for in-situ aluminum nitride particle-reinforced magnesium-based composite materials, belonging to the technical field of metal-based composite material preparation. Background technique: [0002] In the context of increasingly urgent energy conservation and emission reduction, the demand for lightweight and high-strength metal materials in aerospace, automobile, 3C and other fields is also becoming more and more urgent. Due to the advantages of high elastic modulus, high specific strength, low density, good heat resistance, and good wear resistance, particle-reinforced magnesium-based composites have been increasingly widely studied. [0003] The reinforcing phase in particle-reinforced magnesium-based composites is generally oxide, carbide or nitride ceramic particles, such as Al 2 o 3 , SiC, TiC, A...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C23/02C22C32/00C22C1/03C22C1/10
CPCC22C1/1036C22C23/02C22C32/0068C22C1/1052
Inventor 王朝辉李博杜文博刘轲李淑波杜宪
Owner BEIJING UNIV OF TECH