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Preparation method of AlN particle enhanced Mg-Al based composite material

A composite material and particle reinforcement technology, applied in the field of metal matrix composite materials, can solve the problems of limited application field and scope, poor wear resistance and high temperature resistance, low elastic modulus of magnesium alloy, etc., and achieve good interface bonding and good mechanical properties. , the effect of uniform distribution

Inactive Publication Date: 2015-09-16
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, magnesium alloys have disadvantages such as low elastic modulus, low strength, poor wear resistance and high temperature resistance, which limit their application fields and scope; and the solid solubility of alloying elements is low, even if aging strengthening is used, the effect is minimal

Method used

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  • Preparation method of AlN particle enhanced Mg-Al based composite material

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Effect test

Embodiment 1

[0016] A method for preparing an AlN particle reinforced Mg-Al matrix composite material, comprising the following steps:

[0017] Step 1, batching design, weigh the three components of 200 mesh magnesium powder, 10um aluminum powder, and 1-3um AlN powder according to the weight ratio of 91:9:5.26, and then weigh 2% of the aforementioned total mass of stearic acid as Process control agent to prevent powder cold welding and make the reinforcement particles more uniformly distributed in the alloy powder;

[0018] Step 2, ball milling, put the powder mixture, stearic acid, and agate balls of two specifications into a 500ml nylon ball milling jar in a glove box protected by pure argon, and mix various powders under the protection of argon For ball milling, fully mix the materials by ball milling on the roller mill for 26 hours, the speed of the roller mill is 85r / min; the two kinds of balls used in the ball milling process are φ10 and φ6 respectively, and the mass ratio of large b...

Embodiment 2

[0023] A method for preparing an AlN particle reinforced Mg-Al matrix composite material, comprising the following steps:

[0024] Step 1, batching design, weigh the three components of 200-mesh magnesium powder, 10um aluminum powder, and 1-3um AlN powder according to the weight ratio of 91:9:11.11, and then weigh the aforementioned 2% stearic acid as the process Control agent to prevent powder cold welding and make the reinforcement particles more evenly distributed in the alloy powder;

[0025] Step 2, ball milling, put the powder mixture, stearic acid, and agate balls of two specifications into a 500ml nylon ball milling jar in a glove box protected by pure argon, and mix various powders under the protection of argon For ball milling, fully ball mill and mix the materials on the roller mill for 24 hours, the speed of the roller mill is 90r / min; the two kinds of balls used in the ball milling process are φ10 and φ6 respectively, and the mass ratio of large balls to small bal...

Embodiment 3

[0030] A method for preparing an AlN particle reinforced Mg-Al matrix composite material, comprising the following steps:

[0031] Step 1, batching design, weigh the three components of 200 mesh magnesium powder, 10um aluminum powder, and 1-3um AlN powder according to the weight ratio of 91:9:17.65, and then weigh the aforementioned 2% stearic acid as the process Control agent to prevent powder cold welding and make the reinforcement particles more evenly distributed in the alloy powder;

[0032] Step 2, ball milling, put the powder mixture, stearic acid, and agate balls of two specifications into a 500ml nylon ball milling jar in a glove box protected by pure argon, and mix various powders under the protection of argon For ball milling, carry out full ball milling and mixing on the roller mill for 30 hours, the speed of the roller mill is 70r / min; the two kinds of balls used in the ball milling process are φ10 and φ6 respectively, and the mass ratio of large balls to small ba...

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Abstract

The invention provides a preparation method of an AlN particle enhanced Mg-Al based composite material. The preparation method comprises the following steps: weighing magnesium powder, aluminum powder, AlN powder and stearic acid and putting all the weighed materials into a nylon ball milling jar with argon protection, putting the nylon ball milling jar on a roller grinding machine for long-time ball milling mixing at a low speed to obtain an evenly mixed powder, next, pressing the evenly mixed powder into a prefabricated block green body by virtue of bidirectional pressurization in a steel mold, and finally, putting the green body into a graphite crucible, loading the graphite crucible in a vacuum sintering furnace, pre-vacuumizing the sintering furnace, and then introducing argon and heating for sintering under the argon protection. The AlN particle enhanced Mg-Al based composite material prepared by use of the preparation method is even in distribution, high in density, excellent in interface bonding, and good in mechanical and physical properties; and meanwhile, the danger caused by easy combustion of the high-activity magnesium powder during high-energy ball milling, and the problems such as excess interface reaction are avoided.

Description

technical field [0001] The invention belongs to the technical field of metal-based composite materials, and in particular relates to a preparation method of AlN ceramic particles reinforced Mg-Al-based composite materials. Background technique [0002] With the shortage of energy and the deterioration of the environment, people pay more and more attention to lightweight and green manufacturing. From the material point of view, an effective way to solve this problem is to apply a large number of lightweight and high-strength materials. Magnesium alloys have the advantages of low density, high specific strength and specific stiffness, excellent electromagnetic shielding and damping properties, and easy machining and recycling. However, magnesium alloy has disadvantages such as low elastic modulus, low strength, poor wear resistance and high temperature resistance, which limit its application field and scope; and the solid solubility of alloying elements is low, even if aging ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C23/02C22C23/00C22C1/05C22C1/10C22C32/00
Inventor 鲍崇高陈杰
Owner XI AN JIAOTONG UNIV
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