Powder metallurgy preparation method of nanophase/metal composite powder and block material thereof

A metal composite and metal powder technology, applied in the field of metal matrix composite material preparation, can solve the problems of inability to simultaneously satisfy nano-phase dispersibility, poor dispersion effect of carbon nanotubes, lack of deformability of flake powder, etc., and achieves excellent effects, Less metallurgical defects and good structural integrity

Active Publication Date: 2017-02-01
SHANGHAI JIAO TONG UNIV
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Problems solved by technology

Choi et al. ("The effect of milling conditions on microstructures and mechanical properties of Al/MWCNT composites" CompositesPart A 43(2012) 1061-1072) performed high-speed ball milling on aluminum and carbon nanotube mixed powder at 425~600rpm, and the ball milling time exceeded 10h In the process of ball milling, the mixed powder is continuously broken and welded under the impact of steel balls, and finally forms a spherical granular composite powder of carbon nanotubes/aluminum, but the dispersion effect of carbon nanotubes is not good, and its nanostructure is severely damaged. Reinforcement is not effective
Liu et al. ("Mechanical alloying of multi-walled carbon nanotubes and aluminum powders for the preparation of carbon/metal composites" Carbon 47 (2009) 3427-3433) ball milled a mixture of aluminum and carbon nanotubes using a lower milling speed (300rpm) Aluminum powder is flaked under the shearing action of steel balls, and carbon nanotubes are gradually dispersed on the surface of flak

Method used

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  • Powder metallurgy preparation method of nanophase/metal composite powder and block material thereof
  • Powder metallurgy preparation method of nanophase/metal composite powder and block material thereof
  • Powder metallurgy preparation method of nanophase/metal composite powder and block material thereof

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Experimental program
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Example Embodiment

[0028] The preparation method of the nano-phase / metal composite powder of the present invention comprises the following steps:

[0029] (1) The nano-phase powder and metal powder are weighed according to the designed ratio and added to the ball mill;

[0030] (2) The mixed powder is ball-milled at a low speed for a long time to obtain a uniformly dispersed flake composite powder;

[0031] (3) The flake composite powder is subjected to short-time high-speed ball milling to obtain nano-phase / metal granular composite powder;

[0032]On the basis of the above nanophase / metal granular composite powder, the nanophase / metal granular composite powder is densified by powder metallurgy techniques such as pressing, sintering and plastic deformation, and the nanophase / metal composite bulk material is obtained.

Example Embodiment

[0033] Example 1

[0034] Carbon nanotube / aluminum composite

[0035] Spherical aluminum powder with a purity greater than 99.5% and an average particle size of 10 microns is used as the metal matrix powder, and multi-walled carbon nanotubes with an outer diameter of 20-40 nanometers and a length of 2-5 microns are used as the nano-phase powder.

[0036] The carbon nanotube / aluminum mixed powder was placed in a planetary ball mill, the mass fraction of carbon nanotubes was 2%, and the ball-to-material ratio was 20:1, and the low-speed ball milling was performed at 135rpm for 8h, and the high-speed ball mill was 270rpm for 1h to prepare carbon nanotubes / aluminum. Aluminum granular composite powder.

[0037] The carbon nanotube / aluminum granular composite powder was hot-pressed at 300 MPa and 550 °C in a vacuum environment, sintered for 2 h, and then extruded into a round bar sample at 420 °C at a rate of 1 mm / min and an extrusion ratio of 25:1.

Example Embodiment

[0038] Example 2

[0039] Graphene / Copper Composites

[0040] The spherical copper powder prepared by the atomization method has a purity of more than 99.5% and an average particle size of 30 microns; the graphene nanosheets prepared by the redox method have a thickness of 1-3 nanometers and a diameter of 0.5-2 microns.

[0041] The graphene / copper mixed powder was placed in a stirring ball mill, the mass fraction of graphene was 0.5%, 1% mass fraction of stearic acid was added, the ball-to-material ratio was 15:1, and the powder was milled at a low speed of 150 rpm for 6 hours. In a planetary ball mill, the graphene / copper granular composite powder was prepared by ball milling at a high speed of 426 rpm for 0.5 h.

[0042] The graphene / copper granular composite powder was cold-pressed at 500 MPa, sintered at 950 °C for 4 h in an argon atmosphere, and upset at 700 °C until the amount of upsetting was 25% to obtain graphene / copper composite material.

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Abstract

The invention discloses a powder metallurgy preparation method of nanophase/metal composite powder and a block material thereof. The method comprises the steps of carrying out low-speed ball milling on nanophase powder and metal powder for a long time, and uniformly dispersing nanophases on the surface or inside the flake metal powder, so as to obtain nanophase/metal flake composite powder; and carrying out high-speed ball milling for a short time to weld the nanophase/metal flake composite powder to obtain nanophase/metal granular composite powder. According to the preparation method, the problems of uniform dispersion and interface bonding of the nanophases in a metal matrix can be solved through only adjusting the speed of ball milling; compared with traditional constant-speed ball milling, the ball milling method has the advantages that dispersion of the nanophases is more uniform, the interface bonding strength is higher, and the prepared material is more excellent in performance; and the preparation method is simple and efficient in technology and applicable to batch preparation.

Description

technical field [0001] The invention relates to the technical field of metal matrix composite material preparation, in particular to a powder metallurgy preparation method of nanophase / metal composite powder and its bulk material. Background technique [0002] In recent years, due to the excellent mechanical properties of traditional metal matrix composites and the advantages of good plasticity, toughness, thermal stability and processability, nanophase reinforced metal matrix composites have received extensive attention in recent years. It has great application potential in many fields such as aerospace, transportation, electronics and sporting goods. However, various nanophases have excellent mechanical properties, functional properties, and unique geometric shapes, which not only bring excellent performance enhancement to metal matrix composites, but also put forward higher requirements for the composite preparation process. Studies have shown that to give full play to t...

Claims

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Application Information

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IPC IPC(8): B22F9/04B22F1/00
Inventor 李志强徐润谭占秋范根莲张荻
Owner SHANGHAI JIAO TONG UNIV
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