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aln and mgb 2 Particle reinforced magnesium matrix composite material and preparation method thereof

A composite material and particle reinforcement technology, applied in the field of metal matrix composite materials, can solve the problems of difficult control of the reaction process, unsuitable for large-scale production, complex preparation process, etc., and achieve the effects of thermodynamic stability, clean surface and no pollution, and high bonding strength.

Active Publication Date: 2019-09-17
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

but since N 2 The solubility in Mg-Al melt is low, the reaction process of this method is difficult to control, and the preparation process is complicated, the cost is high, and it is not suitable for large-scale production

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] (1) First prepare the required raw materials according to the following mass percentages: industrial pure magnesium powder 90.7 (size ≤ 30 μm), industrial pure aluminum powder 6.2 (size ≤ 30 μm), boron nitride powder 3.0 (size ≤ 1 μm), graphene 0.1 ;

[0020] (2) Take the material in the step (1) in proportion, at first magnesium powder and aluminum powder are ball milled at low speed (ball mill speed 120r / min) 16h, then it is high-speed ball milled together with boron nitride powder and graphene (ball mill speed 400r / min) for 0.5h, the above two steps of ball milling are all carried out under an argon atmosphere, and the ball-to-material ratio is set at 4:1;

[0021] (3) degassing the material after the two-step ball milling in step (2), and pressing it into a prefabricated body in a cold isostatic press;

[0022] (4) Put the prefabricated body into the vacuum sintering furnace, set the vacuum degree at 6×10 -3 Pa, control the sintering temperature to 480°C, and the ...

Embodiment 2

[0025] (1) First prepare the required raw materials according to the following mass percentages: industrial pure magnesium powder 73.0 (size ≤ 40 μm), industrial pure aluminum powder 16.8 (size ≤ 50 μm), boron nitride powder 10.0 (size ≤ 1 μm), graphene 0.2 ;

[0026] (2) Take the material in the step (1) in proportion, at first magnesium powder and aluminum powder are ball milled at low speed (ball mill speed 100r / min) 24h, then it is ball milled at high speed (ball mill speed 100r / min) together with boron nitride powder and graphene 480r / min) 2h, the above two steps of ball milling are all carried out under argon atmosphere, and the ball-to-material ratio is set at 5:1;

[0027] (3) degassing the material after the two-step ball milling in step (2), and pressing it into a prefabricated body in a hot isostatic press;

[0028] (4) Put the prefabricated body into the vacuum sintering furnace, set the vacuum degree at 7×10 -3 Pa, the sintering temperature is controlled to be 5...

Embodiment 3

[0031] (1) First prepare the required raw materials according to the following mass percentages: industrial pure magnesium powder 59.5 (size ≤ 60 μm), industrial pure aluminum powder 25.2 (size ≤ 70 μm), boron nitride powder 15.0 (size ≤ 2 μm), graphene 0.3 ;

[0032] (2) Take the material in step (1) in proportion, at first magnesium powder and aluminum powder are ball milled at low speed (ball mill speed 120r / min) 36h, then it is high-speed ball milled together with boron nitride powder and graphene (ball mill speed 400r / min) 6h, the above two steps of ball milling are all carried out under argon atmosphere, and the ball-to-material ratio is set at 6:1;

[0033] (3) degassing the material after the two-step ball milling in step (2), and pressing it into a prefabricated body in a cold isostatic press;

[0034] (4) Put the prefabricated body into the vacuum sintering furnace, set the vacuum degree at 9×10 -3Pa, control the sintering temperature to 650°C, and the holding time...

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Abstract

The invention relates to an AlN-MgB2 particle-reinforced magnesium-base composite material and a preparation method thereof. Nano-level AlN and submicron-level MgB2 which are generated in situ are uniformly distributed on a magnesium-base composite material matrix; the mass percentage of AlN is 5.0-30.0, and the size of AlN is 10nm-100nm; and the mass percentage of MgB2 is 2.0-20.0, and the size of MgB2 is 0.2-0.8 micron. The preparation method comprises the steps of preparing the raw materials in a proportion, carrying out low-speed ball milling on magnesium powder and aluminum powder for 12-48 hours, carrying out high-speed ball milling on the magnesium powder in an argon atmosphere, then carrying out high-speed ball milling on the aluminum powder, boron nitride powder and graphene for 0.5-8 hours, carrying out degassing and packaging on the materials obtained in two ball milling processes, pressing the materials into prefabricated bodies in a cold / hot isostatic press, and maintaining the temperature at 450-680 DEG C for 10-180 minutes by virtue of a vacuum sintering furnace, so as to obtain the AlN-MgB2 particle-reinforced magnesium-base composite material. The preparation method is safe and reliable.

Description

technical field [0001] The invention belongs to the field of metal matrix composite materials, in particular to a kind of AlN and MgB 2 Particle-reinforced magnesium-based composite material and its preparation method. Background technique [0002] Magnesium alloy has important application value in the automobile, electronics, communication and home appliance industries due to its high specific strength and specific stiffness, excellent damping and shock absorption performance, good machining performance, easy recycling, and no pollution. However, magnesium alloys have low strength, elastic modulus, and poor plasticity, which greatly limit their application fields and scope. In situ generation of ceramic particles with high melting point and high elastic modulus in magnesium alloys to prepare magnesium matrix composites is an effective way to improve the properties of magnesium alloys. [0003] AlN and MgB 2 It has the same close-packed hexagonal crystal structure as magn...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C23/00C22C32/00C22C1/05
Inventor 高通李增强刘相法
Owner SHANDONG UNIV
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