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Metal-based composite material with substrate of nano laminated structure and preparation method thereof

A technology of nano-laminated and composite materials, which is applied in the field of metal matrix composites, can solve the problems of reduced strength and plasticity of layered composite materials, inability to obtain nano-laminated structures, sacrifice material strength and plasticity, etc., and achieve reinforcement distribution Effect of uniformity, improved tolerance, improved dislocation storage and slip capabilities

Active Publication Date: 2012-10-03
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there are two defects in this method: (1) Non-uniform distribution of reinforcements, sacrificing the strength and plasticity of the material: due to the uneven distribution of reinforcements, the strength of the tough layer (without reinforcements) is lower than that of the brittle layer (with reinforcements). body), and the difference in deformation ability between the two will easily lead to local stress concentration and early failure, so the strength and plasticity of the obtained layered structure composite material are reduced; (2) the preparation process is complicated, and the nano-laminated structure cannot be obtained: first The powder metallurgy process is used to prepare particle-reinforced metal matrix composites, and then laminated with pure metals or alloys. The preparation process is complicated, the cost is high, and the nanoscale laminated structure cannot be obtained.

Method used

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  • Metal-based composite material with substrate of nano laminated structure and preparation method thereof
  • Metal-based composite material with substrate of nano laminated structure and preparation method thereof
  • Metal-based composite material with substrate of nano laminated structure and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0041] Prepare the substrate as aluminum oxide (Al 2 o 3 ) / Al nano-laminated metal matrix composite, which contains 16vol.% micron B 4 C particle reinforcement.

[0042] Such as figure 2 Shown is the flow chart of the composite material preparation process.

[0043] Spherical pure aluminum powder with a median particle size of 10 μm is prepared by ball milling to obtain flake aluminum powder with a thickness of about 500 nm, such as image 3 shown. The prepared nano flake powder was put into an atmosphere furnace filled with argon to pyrolyze the residues (solvent and grinding aid) on the surface of the powder, wherein the pyrolysis temperature was 380° C. and the pyrolysis time was 2 h. The pyrolyzed flake aluminum powder is placed in a blast oven to in-situ synthesize a layer of uniform and dense Al with a thickness of about 10 nm on its surface and oxygen in the air. 2 o 3 Thin film, the temperature is 120 ℃, the time is 10 hours (dense Al 2 o 3 After the formatio...

Embodiment 2

[0046] Preparation of metal matrix composites with a matrix of aluminum nitride (AlN) / Al nano-lamination structure, which contains 32vol.% micron B 4 C particle reinforcement.

[0047] The preparation of flake aluminum powder is the same as in Example 1. The pyrolyzed flake aluminum powder was placed in a flow of N 2 (99.9%) heat treatment in an atmosphere furnace to make N 2 In-situ synthesis of a layer of uniform and dense AlN film with the metal on the surface of the powder, the heat treatment temperature is 500 ° C, and the time is 4 hours (the formation of dense AlN can prevent the formation of aluminum and N 2 Further reaction), and finally obtain flake AlN / Al powder, TEM analysis shows that the thickness of the AlN film on the surface is about 10nm.

[0048] B 4 The C reinforcement content is selected as 32vol.%, and its process parameters are the same as in Example 1. Finally, a B with a density of more than 99% and a matrix of a nano-laminated structure is obtain...

Embodiment 3

[0050] Preparation of metal matrix composites with a carbon nanotube (CNT) / 6061Al nano-lamination structure containing 10vol.% micron B 4 C particle reinforcement.

[0051] This embodiment prepares micron B with 6061Al nano-lamination as the substrate 4 C in which reinforcement is evenly distributed B 4 C / 6061Al composite material. The preparation of the flaky metal powder is similar to that of Example 1. The raw metal powder is spherical 6061 alloy aluminum powder with a median particle size of 10 μm and a flaky 6061 Al powder with a thickness of about 500 nm is prepared.

[0052] In order to achieve uniform and firm adsorption of CNTs on the surface of aluminum flakes, flake metal powder slurries and CNT slurries were firstly prepared by combining surface modification and ultrasonic dispersion. Mix CNT slurry and 6061Al slurry by magnetic stirring, CNT is evenly and firmly adsorbed on the surface of flaky 6061Al powder through physical and chemical effects to obtain nano-...

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Abstract

The invention discloses a metal-based composite material with a substrate of a nano laminated structure and a preparation method of the composite material. The particle-reinforced metal-based composite material is prepared from nano flaky metal powder coated with ceramic thin film on the surface and a micrometer ceramic particle reinforcing body as raw materials. The metal-based composite material prepared by the method has the substrate of a metal / ceramic alternate nano laminated structure, and has high interface volume ratio; the ceramic layer can effectively restrict and keep a deformation micro texture, improve dislocation storage and slippage capability, and cause deflection and passivation of crackles, thereby exerting structure toughening benefit; and finally the metal-based composite material is endowed with mechanical properties of high strength and high toughness. The preparation method is simple and feasible, can realize large-scale preparation of large-size composite material, and is contributed to promoting the engineering application of the metal-based composite material.

Description

technical field [0001] The invention relates to the technical field of metal-matrix composite materials, in particular to a ceramic particle-reinforced metal-matrix composite material with a matrix of a nano-lamination structure and a preparation method thereof by flake powder metallurgy. Background technique [0002] Particle-reinforced metal matrix composites have high specific strength, specific modulus, high thermal conductivity, low expansion, high wear resistance, neutron absorption and other functions, and have been widely used in aviation, aerospace, automobile, machinery, electronics and nuclear industries. Applications. However, the addition of reinforcements significantly reduces the plasticity and toughness of metal matrix composites, showing overall brittleness, resulting in difficulties in material deformation and processing, high manufacturing costs, and low service safety, which seriously restricts the further expansion of its practical application. Therefor...

Claims

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Application Information

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IPC IPC(8): C22C1/04C22C1/05C22C32/00
Inventor 李志强怯喜周范根莲张荻
Owner SHANGHAI JIAO TONG UNIV
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