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

A composite material, in-situ self-generation technology, applied in the field of composite materials, can solve the problems of non-wetting of ceramic particles and matrix metal, limit the size of reinforcement phase, affect performance, etc., to achieve good mechanical and physical properties, excellent physical and mechanical properties , Enhance the effect of uniform phase distribution

Inactive Publication Date: 2008-03-26
SHANGHAI JIAO TONG 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

The Mg-base composite material with in-situ autogeneous reinforcing AlN phase contains Mg alloy base in 80-95 wt% and reinforcing AlN ceramic grain in 5-20 wt%. Its Mg alloy base contains Al in 0-9 wt%. The Mg-base composite material is prepared through the following steps: 1. melting Mg-Al alloy material under the protection of mixed gas comprising SF6 in 10 vol% and CO2 in 90 vol%; 2. pressing aluminum foil coated Mg3N2 powder into the Mg-Al melt; 3. maintaining the temperature for the Mg3N2 powder and the Al in the melt to react completely; and 4. 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. and may be applied widely.

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 Applications(China)
IPC IPC(8): C22C23/02C22C1/02B22D21/04C22F1/06
Inventor 张荻张从发范同祥曹玮
Owner SHANGHAI JIAO TONG UNIV
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