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In situ self-generation aluminum nitride enhanced magnesium-base composite material and preparation method thereof

A composite material, an in-situ autogenous technology, applied in the field of magnesium-based composite materials and their preparation, in-situ autogenous aluminum nitride reinforced magnesium-based composite materials and their preparation fields, which can solve the problem of non-wetting of ceramic particles and matrix metals, limiting reinforcement Phase size, affecting properties and other issues, to achieve the effects of superior physical and mechanical properties, good mechanical and physical properties, and enhanced phase distribution

Inactive Publication Date: 2009-10-21
SHANGHAI JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Generally, the preparation of particle-reinforced magnesium-based composites is prepared by external addition method, and there are great disadvantages in this preparation method: (1) because this method generally requires special equipment, which increases the manufacturing cost; (2) because ceramic particles It is difficult to prepare a metal matrix composite material with uniform distribution of ceramic particles because it is not wetted with the matrix metal; (3) The size of the external ceramic particles is fixed, which limits the size of the reinforcing phase; (4) The interface between the ceramic particles and the metal is poorly bonded, which affects the Its final performance; (5) The interface adverse reaction between ceramic particles and metal melt affects its final performance

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] at 10vol.%SF 6 +90vol.%CO 2 Under the condition of mixed gas protection, pure magnesium (90.6wt.%) and pure aluminum (3.3wt.%) were completely melted at 680 ° C, and then wrapped with aluminum foil 3 N 2 (6.1wt.%) powder pressed into the melt, Mg 3 N 2 The particle size of the powder was 20 μm. And continue to keep warm for 60 minutes to ensure that Mg 3 N 2 The powder reacts completely with Al in the melt, and after the heat preservation is completed, the melt is stirred with a graphite disc at a stirring speed of 1000 r / min for 10 minutes. Finally, the scum on the surface is removed, casted in a metal mold and solidified to obtain a 5vol.% AlN / pure Mg composite material. The density of the composite material obtained is: 1.78g / cm 3 , the modulus of elasticity is: 52GPa, the tensile property is: 220MPa, and the tensile property at 150°C is: 180MPa.

Embodiment 2

[0024] at 10vol.%SF 6 +90vol.%CO 2 Under the condition of mixed gas protection, pure magnesium (76.7wt.%) and pure aluminum (11.1wt.%) were completely melted at 700 ° C, and then wrapped with aluminum foil 3 N 2 (12.2wt.%) powder pressed into the melt, Mg 3 N 2 The particle size of the powder was 30 μm. And continue to keep warm for 40 minutes to ensure that Mg 3 N 2 The powder reacts completely with Al in the melt, and after the heat preservation is completed, the melt is stirred with a graphite disc at a stirring speed of 800 r / min for 20 minutes. Finally, the scum on the surface was removed, casted in a metal mold and solidified to obtain a 10wt.% AlN / Mg-5wt.% Al composite material. The density of the composite material obtained is: 1.83g / cm 3 , the elastic modulus is: 60GPa, the tensile property is: 290MPa, and the tensile property at 150°C is: 260MPa.

Embodiment 3

[0026] at 10vol.%SF 6 +90vol.%CO 2 Under the condition of mixed gas protection, pure magnesium (55.2wt.%) and pure aluminum (20.4wt.%) were completely melted at 720°C, and then wrapped with aluminum foil 3 N 2 (24.4wt.%) powder pressed into the melt, Mg 3 N 2 The particle size of the powder was 45 μm. And continue to keep warm for 30 minutes to ensure that Mg 3 N 2 The powder reacts completely with Al in the melt, and after the heat preservation is completed, the melt is stirred with a graphite disc at a stirring speed of 200 r / min for 30 minutes. Finally, the scum on the surface was removed, casted in a metal mold and solidified to obtain a 20wt.% AlN / Mg-9wt.% Al composite material. The density of the obtained composite material is: 1.92g / cm 3 , the elastic modulus is: 77GPa, the tensile property is: 320MPa, and the tensile property at 150°C is: 290MPa.

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Abstract

An in-situ self-generated aluminum nitride-reinforced magnesium-based composite material and a preparation method thereof, wherein the composite material contains 80%-95% by weight of the magnesium alloy matrix, and 5%-20% by weight of AlN ceramic particles. %. The weight percent content of aluminum in the magnesium alloy matrix is ​​0%-9%. The preparation method is as follows: (1) under the protection condition of 10vol.%SF6+90vol.%CO2 mixed gas, completely melt the magnesium-aluminum alloy raw material; (2) then press the Mg3N2 powder wrapped with aluminum foil into the magnesium-aluminum melt ; (3) After adding Mg3N2 powder into the melt, keep it warm to ensure that the Mg3N2 powder reacts completely with Al in the melt. (4) After the heat preservation is completed, stir the melt with a graphite disk, remove the scum on the surface, and cast it in a metal mold to solidify to obtain the material. The composite material prepared by the invention has the characteristics of light weight, high strength, high modulus, high temperature resistance, etc., and can be widely used in transportation industry and national defense industry.

Description

technical field [0001] The invention relates to a magnesium-based composite material and a preparation method thereof in the technical field of composite materials, in particular to an in-situ self-generated aluminum nitride-reinforced magnesium-based composite material and a preparation method thereof. Background technique [0002] Due to its high specific strength, specific modulus, good wear resistance, high temperature resistance and shock absorption properties, particle reinforced magnesium matrix composites have potential application prospects and broad markets in aerospace and automobile industries. Generally, the preparation of particle-reinforced magnesium-based composites is prepared by external addition method, and there are great disadvantages in this preparation method: (1) because this method generally requires special equipment, which increases the manufacturing cost; (2) because ceramic particles It is difficult to prepare a metal matrix composite material wi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C23/02C22C1/02B22D21/04C22F1/06
Inventor 张荻张从发范同祥曹玮
Owner SHANGHAI JIAOTONG UNIV
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