Preparation method of graphene/silicon carbide/aluminum composite material

A technology of aluminum composite materials and graphene, which is applied in the field of metal matrix composite materials, can solve the problem of low thermal conductivity of composite materials, achieve uniform and dense structure, and inhibit thermal expansion

Inactive Publication Date: 2018-11-13
LANZHOU JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The current research mainly focuses on the reinforcement effect of silicon carbide fiber or three-dimensional graphene alone. There are few reports on the synergistic reinforcement effect of the two, and there are even fewer studies on the thermal conductivity of composite materials.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Silicon carbide fibers (100nm in diameter, 50μm in length) and graphene oxide (10μm in diameter, 2nm in thickness) were ultrasonically dispersed in ethanol solution at a ratio of 1:9 (v:v) for 1h, and configured into 3 mg / ml dispersion, then transferred to a PTPE mold (mold size 16×16×3cm), the mold was placed on the surface of liquid nitrogen for 10 minutes, directional and orderly frozen from top to bottom, and then the sample was freeze-dried, dried The time is 48 hours, and the silicon carbide fiber / three-dimensional graphene skeleton with an oriented and ordered network structure is obtained; after that, pre-sintering is carried out in a tube furnace, and the temperature is raised to 800 degrees Celsius at a speed of 20 degrees Celsius / min, and the temperature is kept for 6 hours to obtain a solidified Silicon carbide fiber / three-dimensional graphene skeleton with oriented and ordered network structure; placing a sufficient amount of aluminum block on silicon carbid...

Embodiment 2

[0023] Silicon carbide fibers (200nm in diameter, 50μm in length) and graphene oxide (20μm in diameter, 2nm in thickness) were ultrasonically dispersed in ethanol solution at a ratio of 1:9 (v:v) for 1h, and configured into 3 mg / ml dispersion, then transferred to a PTPE mold (mold size 16×16×3cm), the mold was placed on the surface of liquid nitrogen for 10 minutes, directional and orderly frozen from top to bottom, and then the sample was freeze-dried, dried The time is 48 hours, and the silicon carbide fiber / three-dimensional graphene skeleton with an oriented and ordered network structure is obtained; after that, pre-sintering is carried out in a tube furnace, and the temperature is raised to 800 degrees Celsius at a speed of 20 degrees Celsius / min, and the temperature is kept for 6 hours to obtain a solidified Silicon carbide fiber / three-dimensional graphene skeleton with oriented and ordered network structure; placing a sufficient amount of aluminum block on silicon carbid...

Embodiment 3

[0025] Silicon carbide fibers (100nm in diameter, 50μm in length) and graphene oxide (10μm in diameter, 2nm in thickness) were ultrasonically dispersed in an ethanol solution at a ratio of 1:9 (v:v) for 1h, and configured into 10mg / ml dispersion, then transferred to a PTPE mold (mold size 16×16×3cm), the mold was placed on the surface of liquid nitrogen for 10 minutes, directional and orderly frozen from top to bottom, and then the sample was freeze-dried, drying time After 48 hours, the silicon carbide fiber / three-dimensional graphene skeleton with an oriented and ordered network structure is obtained; after that, pre-sintering is carried out in a tube furnace, and the temperature is raised to 800°C at a speed of 20°C / min, and the temperature is kept for 6h to obtain a solidified orientation. The silicon carbide fiber / three-dimensional graphene skeleton of the network structure arranged in an orderly manner; After placing a sufficient amount of aluminum block on the silicon c...

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Abstract

The invention relates to a preparation method of a graphene / silicon carbide / aluminum composite material. The preparation method includes the following preparation steps that after silicon carbide fiber / graphene oxide mixed dispersion liquid of a certain concentration is prepared according to the proportion, the mixed dispersion liquid is transferred into a PTPE mold, the mold is placed on the surface of liquid nitrogen for fast freezing, then freezing and drying are performed, pre-sintering is performed, and an oriented and orderly arranged silicon carbide fiber / three-dimensional graphene framework is obtained; and enough aluminum blocks are vertically placed on the surface of the silicon carbide fiber / three-dimensional graphene framework, pressure infiltration is performed in a vacuum pressure infiltration furnace, and the compact graphene / silicon carbide / aluminum composite material is obtained. Graphene and silicon carbide fibers in the composite material prepared through the preparation method are of a three-dimensional network crossed structure, more heat conduction channels are provided, three-dimensional network crossing of the silicon carbide fibers provides the high-strength framework, and the high temperature stability of the material is improved. The composite material prepared through the preparation method is uniform in component, low in heat expansion coefficient and high in heat conduction rate.

Description

Technical field: [0001] The invention relates to the technical field of metal matrix composite materials, in particular to a method for preparing a high thermal conductivity and low expansion graphene / silicon carbide / aluminum composite material. Background technique: [0002] Aluminum matrix composites have become the most widely used metal matrix composites due to their low density, good heat treatability, and flexible preparation process. Among them, silicon carbide reinforced aluminum matrix composites have become a research hotspot of aluminum matrix composites due to their excellent thermal conductivity, low expansion coefficient, high specific strength and specific stiffness, and wear resistance. Currently commonly used reinforcements include silicon carbide particles and silicon carbide fibers. Silicon carbide fiber has high specific strength, specific modulus and excellent high temperature performance. The thermal expansion coefficient of silicon carbide fiber is sm...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C47/06C22C47/08C22C49/06C22C49/14C22C101/14
CPCC22C47/06C22C47/08C22C49/06C22C49/14
Inventor 褚克王钒李渊博耿中荣李玉彪
Owner LANZHOU JIAOTONG UNIV
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