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

An in-situ self-generated, composite material technology, applied in the field of composite materials, can solve the problems of restricting the size of the reinforced phase, affecting performance, and limited, and achieve good mechanical and physical properties, uniform distribution of the reinforced phase, and controllable particle size.

Inactive Publication Date: 2009-05-27
SHANGHAI JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this paper, the preparation methods of magnesium matrix composites are reviewed, most of which adopt the external method to prepare particle reinforced magnesium matrix composites; there are many disadvantages in the preparation of magnesium matrix composites by the external method: (1) because the external method generally requires special (2) Since the ceramic particles and the matrix metal are not wet, it is difficult to prepare a metal matrix composite material with uniform distribution of ceramic particles; (3) The size of the external ceramic particles is fixed, which limits the size of the reinforcing phase; ( 4) Poor interface bonding between ceramic particles and metal affects its final performance; (5) Poor interface reaction between ceramic particles and metal melt affects its final performance
However, there is still no good in-situ reaction phase to generate a good reinforcement phase. At present, the main thing is to form Mg in situ 2 Si single-phase particle reinforcement; and due to Mg 2 The performance of Si is not high, such as the elastic modulus is only 120GPa, the performance improvement of the resulting magnesium-based composites is very limited

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] at 10vol.%SF 6 +90vol.%CO 2 Under the condition of mixed gas protection, the pure magnesium ingot (98.4wt.%) and pure aluminum ingot (0.7wt.%) were completely melted at 680 ° C, and then wrapped with aluminum foil 3 N 4 (0.9wt.%) powder pressed into the melt, Si 3 N 4 The particle size is 0.5 μm. Then raise the temperature to 800°C, and keep it warm for 90 minutes to ensure Si 3 N 4 The powder reacts completely with Mg and Al in the melt. After the heat preservation is completed, the temperature is lowered to 680°C and the heat is kept, and the melt is stirred with a graphite disc stirring paddle at a stirring speed of 1000r / min for 10 minutes. Finally, remove the scum on the surface and cast it into a metal mold to obtain 2.4wt.% (AlN+Mg 2 Si) / pure Mg composite material, wherein the weight fraction of AlN is 1%, Mg 2 The weight fraction of Si is 1.4%. The resulting (AlN+Mg 2 Si) The density of the reinforced pure magnesium matrix composite material is: 1.75g / ...

Embodiment 2

[0026] at 10vol.%SF 6 +90vol.%CO 2 Under the condition of mixed gas protection, pure magnesium ingots (81.1wt.%) and pure aluminum ingots (10.4wt.%) were completely melted at 700 ° C, and then wrapped with aluminum foil 3 N 4 (8.5wt.%) powder pressed into the melt, Si 3 N 4 The particle size is 1 μm. Then raise the temperature to 850°C, and keep it warm for 60 minutes to ensure Si 3 N 4 The powder reacts completely with Mg and Al in the melt. After the heat preservation is completed, the temperature is lowered to 700°C for heat preservation, and the melt is stirred with a graphite disk stirring paddle. The stirring speed is 600r / min and the stirring time is 20 minutes. Finally, remove the scum on the surface and cast it into a metal mold to obtain 24wt.% (AlN+Mg 2 Si) / Mg-5wt.% composite material, wherein the weight fraction of AlN is 10%, Mg 2 The weight fraction of Si is 14%. The resulting (AlN+Mg 2 Si) strengthens the density of the magnesium-aluminum alloy matrix ...

Embodiment 3

[0028]at 10vol.%SF 6 +90vol.%CO 2 Under the condition of mixed gas protection, pure magnesium ingots (71.5wt.%) and pure aluminum ingots (15.7wt.%) were completely melted at 720 ° C, and then wrapped with aluminum foil 3 N 4 (12.8wt.%) powder pressed into the melt, Si 3 N 4 The particle size is 40 μm. Then raise the temperature to 900°C and keep it warm for 30 minutes to ensure Si 3 N 4 The powder reacts completely with Mg and Al in the melt. After the heat preservation is completed, the temperature is lowered to 720°C for heat preservation, and the melt is stirred with a graphite disk stirring paddle. The stirring speed is 200r / min and the stirring time is 40 minutes. Finally, remove the scum on the surface and cast it in a metal mold to obtain 36wt.% (AlN+Mg 2 Si) / Mg-9wt.%Al composite material, wherein the weight fraction of AlN is 15%, Mg 2 The weight fraction of Si is 21%. The resulting (AlN+Mg 2 The density of Si) reinforced magnesium-aluminum alloy matrix compo...

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PUM

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Abstract

The Mg-base composite material with in-situ autogeneous reinforcing AlN and Mg2Si phases contains Mg alloy base in 64-97.6 wt% and reinforcing AlN and Mg2Si ceramic phases in 2.4-36 wt%. Its Mg alloy base contains Al in 0-9 wt% and Mg for the rest, and the reinforcing phases include AlN in 1-15 wt% and Mg2Si in 1.4-21 wt%. The Mg-base composite material is prepared through the following steps: 1. melting Mg-Al alloy material under the protection of mixed SF6+CO2 gas; 2. pressing aluminum foil coated Si3N4 powder into the Mg-Al melt; 3. further heating and maintaining; and 4. cooling, maintaining, stirring the melt and skimming the scum with a graphite disc, casting into metal mold and solidifying to obtain the composite material. The composite material has the features of light weight, high strength, high modulus, high heat resistance, etc.

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 and magnesium disilicate reinforced magnesium-based composite material and a preparation method thereof. Background technique [0002] Magnesium alloy is currently the lightest metal structural material in industrial applications. It has high specific strength, specific stiffness, good casting, shock absorption, cutting, electromagnetic shielding and recyclable properties, making it widely used in 3C products, in the aviation industry and the automotive industry. With the increasing requirements for energy saving and consumption reduction in transportation and the increasing emphasis on environmental protection, the application potential of magnesium alloys in this area has been further promoted; but at the same time, the performance requirements of magn...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C23/00C22C1/02
Inventor 张荻张从发范同祥曹玮
Owner SHANGHAI JIAOTONG UNIV