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Graphene reinforced rare earth magnesium-based composite material and preparation method thereof

A composite material, rare earth magnesium technology, applied in the field of graphene reinforced rare earth magnesium matrix composite material and its preparation, to achieve the effects of strength and plasticity improvement, wettability improvement, strength and plasticity enhancement

Active Publication Date: 2021-10-22
SHANGHAI SPACE PRECISION MACHINERY RES INST
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Problems solved by technology

[0004] In order to overcome the deficiencies in the prior art, the inventors have carried out dedicated research and provided a graphene-reinforced rare-earth magnesium-based composite material and a preparation method thereof, using silver-coated graphene to solve the problem of graphene in the metal-based composite material. The problem of agglomeration not only improves the wettability of graphene and molten metal, but also obtains a composite material with uniformly dispersed reinforcement, and improves the mechanical properties of the material, thereby completing the present invention

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  • Graphene reinforced rare earth magnesium-based composite material and preparation method thereof
  • Graphene reinforced rare earth magnesium-based composite material and preparation method thereof

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preparation example Construction

[0018] The invention provides a method for preparing a graphene-reinforced rare-earth magnesium-based composite material, comprising the following steps:

[0019] Step 1. Preparation of rare earth magnesium alloy semi-solid slurry: Raise the temperature of rare earth magnesium alloy to 700°C-800°C, and reduce the temperature to 550°C-650°C after the rare earth magnesium alloy matrix is ​​completely melted to obtain rare earth magnesium alloy semi-solid slurry ;

[0020] In this step, the composition of the rare earth magnesium alloy is Mg-(0-20)X-(0-1)Zr-(0-10)Ag(wt.%), X is Gd, La, Er, Y, One or a combination of Sc and Zn. Rare earths can refine the grains of magnesium alloys, reduce the tendency of thermal cracking, and improve the comprehensive strength and toughness of the alloy at room temperature and high temperature. Silver plays a solid solution strengthening role in rare earth magnesium alloys, which can improve the plasticity of rare earth magnesium alloys.

[0021...

Embodiment 1

[0030] Heat 8 kg of the matrix Mg-7Gd-0.5Zn-0.4Zr-2Ag rare earth magnesium alloy to 750°C to melt, then cool down to 610°C, and keep it warm for 5 minutes to obtain a rare earth magnesium alloy semi-solid slurry. Then add 1.1kg of silver-coated graphene (silver content is 65wt%, the rest is graphene, the particle size is 20 μm), carry out ultrasonic stirring, the power is 800KW, the time is 35min. Raise the temperature to 730°C again, and perform ultrasound with a power of 600KW for 10 minutes. Then it is poured into a mold preheated to 300°C and solidified under a pressure of 25MPa to obtain a graphene-enhanced rare earth magnesium-based composite material with a graphene content of 4.2wt% and a silver content of 9.6wt%. The SEM image of the composite material is as follows figure 1 shown.

[0031] After testing, the room temperature tensile strength of the composite material is 396MPa, and the elongation is 6.7%.

Embodiment 2

[0033] Heat 10kg of the matrix Mg-8Gd-2Y-5Ag rare earth magnesium alloy to 760°C to melt, then cool down to 580°C, and keep it warm for 8 minutes to obtain a rare earth magnesium alloy semi-solid slurry. Then add 0.8kg silver-coated graphene (silver content is 60wt%, the rest is graphene, particle size is 15 μ m), carry out mechanical stirring, rotating speed 900r / min, time 25min. Raise the temperature to 740°C again, and perform ultrasound with a power of 600KW for 8 minutes. Then it is poured into a mold preheated to 200° C. and solidified under a pressure of 10 MPa to obtain a graphene-reinforced rare-earth magnesium-based composite material with a graphene content of 3 wt % and a silver content of 9 wt %.

[0034] After testing, the room temperature tensile strength of the composite material is 412MPa, and the elongation is 7.3%.

[0035] Example 3 ~4 and comparative examples 1~2

[0036] Examples 3-4 and Comparative Examples 1-2 are the same as Example 1, except that ...

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Abstract

The invention provides a graphene reinforced rare earth magnesium-based composite material and a preparation method thereof. The graphene reinforced rare earth magnesium-based composite material comprises 0.5-5 wt% of graphene, 0.5-10 wt% of silver and the balance matrix alloys. The temperature of the rare earth magnesium alloy is raised to 700-800 DEG C, the temperature is lowered to 550-650 DEG C after the matrix alloys are completely molten, and rare earth magnesium alloy semi-solid slurry is obtained; the silver-coated graphene is added into the rare earth magnesium alloy semi-solid slurry, and uniformly mixed to obtain a graphene-rare earth magnesium alloy mixed melt; and the graphene-rare earth magnesium alloy mixed melt is heated to 700-760 DEG C, ultrasonic and / or mechanical stirring are / is conducted, then the graphene-rare earth magnesium alloy mixed melt is poured into a mold, and solidification is conducted under the pressure being 5-40MPa to obtain the graphene reinforced rare earth magnesium-based composite material. According to the composite material and the preparation method, the problem of agglomeration of graphene in the metal-based composite material is solved through the silver-coated graphene, the wettability of graphene and molten metal is improved, the composite material with uniformly dispersed reinforcements is obtained, and meanwhile, the mechanical property of the material is improved.

Description

technical field [0001] The invention belongs to the technical field of composite materials, and in particular relates to a graphene-reinforced rare-earth magnesium-based composite material and a preparation method thereof. Background technique [0002] Magnesium-based composites have a series of advantages such as high specific strength, high specific stiffness, good shock absorption and wear resistance, making them have huge potential application prospects in the fields of electronics, aerospace and automobiles. How to develop lightweight, high-strength and high-toughness magnesium alloy composites has become one of the research hotspots in the field of materials. [0003] Graphene has extremely high strength and stiffness, excellent heat transfer and electrical conductivity. As a reinforcing phase of metal matrix composites, it can effectively improve the strength and other mechanical properties of composite materials, and is expected to bring breakthroughs in thermal, el...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C23/00C22C32/00B22D27/00B22D27/09C22C1/10C22C1/03
CPCC22C23/00C22C32/0084C22C1/1036B22D27/00B22D27/09Y02P10/25
Inventor 汪彦博周海涛孙京丽刁威肖旅王世伟侯湘武罗志强季松王煜烨
Owner SHANGHAI SPACE PRECISION MACHINERY RES INST
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