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Powder metallurgy preparation method of nano-graphite flake/Al alloy-based composite material

A technology of nano-graphite flakes and composite materials, which is applied in the field of preparation of metal matrix composite materials, to achieve the effects of excellent comprehensive performance, uniform distribution, and promotion of development

Active Publication Date: 2019-08-02
HEFEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The material design and preparation method of the above-mentioned nano-graphite flake / Al alloy-based composite material are all original inventions of the patent of the present invention, and have not been published at home and abroad.

Method used

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  • Powder metallurgy preparation method of nano-graphite flake/Al alloy-based composite material
  • Powder metallurgy preparation method of nano-graphite flake/Al alloy-based composite material
  • Powder metallurgy preparation method of nano-graphite flake/Al alloy-based composite material

Examples

Experimental program
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Effect test

Embodiment 1

[0023] Example 1: 15wt% larger-sized nano-graphite flakes / 6061Al-based composite material sintered at 610 °C and 55 MPa by mechanical stirring and mixing

[0024] (1) Material selection: select larger-sized nano-graphite sheets with an average particle size D50 of 30-100 μm and a thickness of 100-200 nm, and gas-atomized 6061Al alloy powders with an average particle size D50 of 10-30 um and a spherical or quasi-spherical shape As a powder for the preparation of composite materials;

[0025] (2) Dispersion: Weigh 3g of nano-graphite flake powder and place it in 120ml of absolute ethanol, and then disperse by ultrasonic wave for 60 min until the nano-graphite flakes are evenly and stably suspended in absolute ethanol;

[0026] (3) Mixing: Weigh 17g of Al alloy powder and add it to the suspension of graphite flakes, stir for 10 h with an electric stirrer at a speed of 200 r / min, and ultrasonically treat the slurry synchronously during the mechanical stirring process;

[0027] (4...

Embodiment 2

[0029] Embodiment 2: 15wt% smaller size nano-graphite flakes / 6061Al-based composite material sintered at 610°C and 55MPa by mechanical stirring and mixing

[0030] The preparation process of this example is the same as that of Example 1, except that the smaller-sized graphite nano-sheets selected in step (1) are in the form of flakes, with a diameter of 1-20 μm and a thickness of 5-20 nm. Other processes and parameters constant.

Embodiment 3

[0031] Example 3: 30wt% larger size nano-graphite sheets A / 6061Al-based composite material sintered at 610°C and 55MPa by mechanical stirring and mixing

[0032] The preparation process of this embodiment is the same as that of Example 1, except that the content of the nano-graphite sheets selected in step (1) is 30wt%, and other processes and parameters remain unchanged.

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Abstract

The invention discloses a powder metallurgy preparation method of a nano-graphite flake / Al alloy-based composite material. The method includes the following steps that nano-graphite flakes in a certain size are selected and subjected to ultrasonic dispersion in absolute ethyl alcohol; after Al alloy powder is added according to a set formula, the materials are mixed through mechanical stirring andsynchronous ultrasonic treatment; after material mixing, heat preservation is carried out at 50-80 DEG C, and drying is carried out. The compactness of the 15-30wt% nano-graphite flake / Al alloy-basedcomposite material prepared from the nano-graphite flake and Al alloy mixed powder through spark plasma sintering (SPS) at 600-650 DEG C under the pressure condition of 40-60 MPa is higher than 98%,and the bending strength is over 90 MPa. The heat conductivity of the 30wt% nano-graphite flake / Al alloy-based composite material in the X-Y direction reaches 192 W / (m.K), the heat conductivity in theZ direction reaches 60 W / (m.K), the thermal expansion coefficient in the X-Y direction is as low as 10.4*10<-6> / DEG C, and the thermal expansion coefficient in the Z direction is as low as 11.2*10<-6> / DEG C. The metal-based composite material is excellent in comprehensive performance and can serve as a high-performance electronic packaging heat sink material.

Description

technical field [0001] The invention relates to a preparation method of a metal-based composite material, in particular to a powder metallurgy preparation method of a nano-graphite sheet / Al alloy-based composite material used for electronic packaging, and belongs to the field of new materials and its preparation technology. Background technique [0002] In today's era, my country's microelectronics, power electronics and integrated circuit industries are developing rapidly, the integration and power density of electronic circuits have been significantly improved, and the heat generated by chips and other work has been greatly increased. Therefore, higher heat dissipation capabilities of electronic devices are proposed. requirements. The electronic device dissipates heat outward through the substrate and the heat sink material. Therefore, the heat dissipation capacity of the heat sink material is the key to the heat dissipation efficiency of the electronic device. In addition...

Claims

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Application Information

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IPC IPC(8): C22C21/00C22C1/05C22C1/10
CPCC22C1/05C22C21/00C22C32/0084
Inventor 汤文明陈国栋孙健常润东
Owner HEFEI UNIV OF TECH