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Preparation method of graphene-silicon carbide fiber reinforced metal composite material

A metal composite material, silicon carbide fiber technology, applied in metal material coating process, nanotechnology for materials and surface science, gaseous chemical plating, etc., can solve the problem of lack of synergistic reinforcement

Inactive Publication Date: 2018-10-16
LANZHOU JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Current research focuses on using silicon carbide nanofibers or graphene alone as the reinforcing phase of the metal matrix, and no experimenter has studied the synergistic strengthening effect of the two.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Graphene powder (diameter: 20 μm, thickness: 2 nm) in saturated Fe(NO) 3 Sonicate the solution for 5 min, put it into an alumina boat covered with 10 g of silicon powder (10 μm) after drying, and grow and deposit silicon carbide nanofibers under an argon atmosphere. CVD parameters: the gas flow rate is 100 sccm, and the heating rate is 5 ℃ / min, the deposition temperature is 1500 ℃, and the deposition time is 6 h to obtain graphene-silicon carbide nanofiber composite powder; the composite powder is first dispersed in water / alcohol solution (v:v=1:9) solution After that, 2 μm aluminum powder (composite powder is 1 vol%) was added into the solution for high-speed shear mixing (speed: 10000 rpm, time: 1 h) to obtain a graphene-silicon carbide nanofiber / aluminum mixed dispersion. The mixed dispersion was quickly placed in liquid nitrogen to freeze to form a solid and then freeze-dried (time 48 h) to obtain graphene-silicon carbide nanofiber / aluminum composite powder, which w...

Embodiment 2

[0025] Graphene powder (diameter: 20 μm, thickness: 2 nm) in saturated Fe(NO) 3 Sonicate the solution for 5 min, put it into an alumina boat covered with 10 g of silicon powder (10 μm) after drying, and grow and deposit silicon carbide nanofibers under an argon atmosphere. CVD parameters: the gas flow rate is 100 sccm, and the heating rate is 5 ℃ / min, the deposition temperature is 1500 ℃, and the deposition time is 6 h to obtain graphene-silicon carbide nanofiber composite powder; the composite powder is first dispersed in water / alcohol solution (v:v=1:9) solution After that, 5 μm spherical copper powder (1 vol% of the composite powder) was added into the solution for high-speed shear mixing (speed: 10000 rpm, time: 1 h) to obtain a graphene-silicon carbide nanofiber / copper mixed dispersion. The mixed dispersion was quickly placed in liquid nitrogen to freeze to form a solid and then freeze-dried (time 48 h) to obtain graphene-silicon carbide nanofiber / copper composite powder,...

Embodiment 3

[0027] Graphene powder (diameter: 20 μm, thickness: 2 nm) in saturated Fe(NO) 3 Sonicate the solution for 5 min, put it into an alumina boat covered with 10 g of silicon powder (10 μm) after drying, and grow and deposit silicon carbide nanofibers under an argon atmosphere. CVD parameters: the gas flow rate is 100 sccm, and the heating rate is 5 ℃ / min, the deposition temperature is 1500 ℃, and the deposition time is 6 h to obtain graphene-silicon carbide nanofiber composite powder; the composite powder is first dispersed in water / alcohol solution (v:v=1:9) solution After that, 1 μm nickel powder (composite powder is 1 vol%) was added into the solution for high-speed shear mixing (speed: 10000 rpm, time: 1 h) to obtain a graphene-silicon carbide nanofiber / nickel mixed dispersion. The mixed dispersion was quickly placed in liquid nitrogen to freeze to form a solid and then freeze-dried (time 48 h) to obtain graphene-silicon carbide nanofiber / nickel composite powder, which was the...

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Abstract

The invention relates to a preparation method of graphene-silicon carbide fiber synergetically reinforced metal composite material and belongs to the field of metal-base composite materials. The preparation method comprises the following steps: carrying out in-situ growth of silicon carbide fibers on the surface of graphene by means of chemical vapor deposition; putting the obtained composite powder and metal powder which are sheared and mixed at a high speed in liquid nitrogen to be quickly frozen and then carrying out freeze drying to obtain graphene-silicon carbide / metal composite powder; and carrying out spark plasma sintering on the composite powder to obtain the high density graphene-silicon carbide / metal composite material. The composite material metal matrix prepared by the invention is compactly combined with a reinforced phase, the tissues are compact, and the material has relatively high strength and keeps good toughness simultaneously. The preparation method provided by theinvention is simple in process and low in cost. An interface strengthening action is generated when the silicon carbide fibers of in-situ growth and a metal are compounded, so that the toughness of the metal matrix is further improved.

Description

technical field [0001] The invention belongs to the technical field of metal matrix composite materials, and in particular relates to a preparation method of graphene-silicon carbide fiber reinforced metal composite materials. Background technique [0002] The tensile strength of single-layer graphene can reach 130 GPa, and the Young's modulus is as high as 1.0 TPa, which is the highest strength material known to mankind. Graphene has a huge specific surface area (≈2600 m 2 / g) while having a very low density (2.2g / cm 3 ), together with its excellent mechanical properties, make graphene very suitable for use as a strengthening phase in composite materials. However, the interface between graphene and metal elements has poor wettability, weak binding force, poor dispersion and easy agglomeration. [0003] Zan Li et al. (Carbon 95 (2015) 419-427) prepared a composite material by mixing and assembling GNPs-CNTs composite flakes to strengthen the aluminum matrix. The experimen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C49/14C22C47/14C23C16/32C23C16/44B82Y40/00B82Y30/00C22C101/14
Inventor 褚克王钒魏小平耿中荣黄大建李渊博康皓
Owner LANZHOU JIAOTONG UNIV
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