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Powder metallurgy preparation method for high-strengthening-toughening metal-based composite material

A composite material and powder metallurgy technology, applied in the field of powder metallurgy preparation of high-strength and toughened metal matrix composite materials, can solve the problems of material plasticity decline, poor matching of strength and toughness, complex dispersion process, etc., so as to delay deformation and instability and improve strength. Good effect with plasticity and controllability

Active Publication Date: 2018-05-29
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Aiming at the problem of poor strength and toughness matching of high-strength or ultra-high-strength metal matrix composites with ultra-fine grain structure, especially the poor dispersion, easy agglomeration, complicated dispersion process and ultra-fine grain structure in the dispersion process when the reinforcing phase is a nano phase Formation of the disadvantages of seriously reducing the plasticity of the material. The purpose of the present invention is to provide a powder metallurgy preparation method for high-strength and toughened metal matrix composites. This method can effectively improve the performance and preparation efficiency of the material, and is suitable for various reinforced phase and matrix

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Using pure aluminum powder with an average particle size of 13μm and 60nm Al 2 o 3 Particles are used as raw materials to prepare aluminum matrix composite materials with a mass fraction of 5% nano-alumina. Proceed as follows:

[0030] (1) Add the nano-alumina particle of massfraction 2% (in the ratio in mixing powder) to pure aluminum powder, pack into ball mill jar, then add the stearic acid of 3% (accounting in the ratio of mixing powder) as Process control agent, ball milled on a planetary ball mill at 100 rpm for 1 hour to mix evenly. The weight ratio of ball to material is 20:1.

[0031] (2) Increase the rotational speed to 300 rpm, and ball mill for 2 hours.

[0032] (3) Add 3% mass fraction (ratio in the mixed powder) of nano-alumina particles to the ball mill jar again, and ball mill at 100 rpm for 1 hour to mix evenly. The weight ratio of ball to material is 20:1.

[0033] (4) Increase the rotating speed to 300 rpm, and ball mill for 6 hours.

[0034] (...

Embodiment 2

[0039] Using pure copper powder with an average particle size of 16μm and 60nm Al 2 o 3 Particles are used as raw materials to prepare copper-based composite materials with a mass fraction of 3% nano-alumina. Proceed as follows:

[0040] (1) Add massfraction 1% (in the ratio in the mixed powder) of nano-alumina particles and 2% stearic acid (accounting for the ratio of the mixed powder) in the pure copper powder, pack into the ball mill jar, in the planetary ball mill Ball mill at 100 rpm for 1 h to mix well. The weight ratio of ball to material is 20:1.

[0041] (2) Increase the rotational speed to 250 rpm, and ball mill for 1 hour.

[0042] (3) Add 2% mass fraction (the ratio in the mixed powder) of nano-alumina particles to the ball mill jar again, and ball mill at 100 rpm for 1 hour to mix evenly. The weight ratio of ball to material is 20:1.

[0043] (4) Increase the rotating speed to 280 rpm, and ball mill for 5 hours.

[0044] (5) Take out the powder, put it into...

Embodiment 3

[0049] SiC particles with an average particle size of 75nm and Ti-6Al-4V alloy powder with an average particle size of 44μm were prepared and blended to prepare a titanium-based composite material reinforced with nano-SiC particles with a particle volume content of 6%. Proceed as follows:

[0050] (1) Put the alloy powder and 3% (proportion in the mixed powder) SiC particles into a planetary ball mill jar, and ball mill at 100 rpm for 1 hour to mix evenly. The weight ratio of ball to material is 20:1.

[0051] (2) Increase the rotational speed to 220 rpm, and ball mill for 1.5 hours.

[0052] (3) Adding nano-SiC particles with a mass fraction of 3% (proportion in the mixed powder) again, and ball milling at 100 rpm for 1 hour to mix evenly. The ratio of ball to material is 20:1.

[0053] (4) The rotating speed is increased to 240 rpm, and the ball milling is performed for 6 hours.

[0054] (5) Put the mold into a vacuum sintering furnace for two-way hot pressing, heat to 4...

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Abstract

The invention discloses a powder metallurgy preparation method for a high-strengthening-toughening metal-based composite material and belongs to the field of metal-based composite materials. The method comprises the steps that (1), mixed powder of metal powder and part reinforcing phase is subjected to ball-milling treatment, and ball-milling is stopped before all crystal particles in the metal powder reach ultrafine crystal; (2), the rest reinforcing phase is added to the powder after ball-milling in the step (1), the ball-milling is continued, and the ball-milling is stopped until the reinforcing phase is completely dispersed; (3), after the powder after the ball-milling in the step (2) is treated by powder metallurgy sintering process, then the high-strengthening-toughening metal-basedcomposite material is obtained. According to the powder metallurgy preparation method for the high-strengthening-toughening metal-based composite material, the reinforcing phase is made to be orderlydistributed in a base body by adding the reinforcing phase step by step; crystal particle distribution is adjusted and controlled utilizing the crystal particle refining effect of the reinforcing phase on the base body, a coarse and fine crystal gradient grading structure is formed, thus the strengthening-toughening of materials is realized; and by means of the powder metallurgy preparation methodfor the high-strengthening-toughening metal-based composite material, the process procedure can be simplified, and the strong plasticity of the materials can be improved at the same time.

Description

technical field [0001] The invention relates to the technical field of metal-matrix composite materials, in particular to a powder metallurgy preparation method for high-strength and toughened metal-matrix composite materials. Background technique [0002] Metal matrix composites are solid-phase materials formed by adding high-performance reinforcing phases such as ceramic particles, fibers, and carbon nanotubes to metal or alloy as the continuous phase. They have high-strength, high-modulus, wear-resistant, and fatigue-resistant properties. It has broad application prospects in the fields of aerospace, nuclear industry, transportation and national defense. [0003] When the grains of the matrix alloy are ultrafine grains, the strength of the metal matrix composite will be greatly improved, but this will be at the expense of a great loss of material plasticity. Especially when nanoparticles etc. are used as the reinforcement phase, it has a better reinforcement effect (N. C...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/04C22C1/05
CPCB22F9/04B22F2009/043B22F2998/10C22C1/05B22F3/02B22F3/14B22F2003/175B22F2003/208B22F2003/248
Inventor 肖伯律昝宇宁马宗义王全兆刘振宇王文广
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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