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A large-size, high-strength graphene nanosheet/silicon carbide composite material and preparation method thereof

A technology of graphene nanosheets and composite materials, applied in the field of large-size, high-strength graphene nanosheets/silicon carbide composite materials and their preparation, can solve the problems of small size, low mechanical properties, etc., to increase the size of the preparation, excellent Mechanical properties, the effect of meeting application requirements

Active Publication Date: 2021-01-12
SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0005] In view of the small size and low mechanical properties of the existing graphene nanosheet / silicon carbide composite material, the object of the present invention is to provide a large-size, high-strength graphene nanosheet / silicon carbide composite material and its preparation method

Method used

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  • A large-size, high-strength graphene nanosheet/silicon carbide composite material and preparation method thereof
  • A large-size, high-strength graphene nanosheet/silicon carbide composite material and preparation method thereof
  • A large-size, high-strength graphene nanosheet/silicon carbide composite material and preparation method thereof

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[0025] Preparation of raw material powder. Specifically, silicon carbide, boron carbide, graphene nanosheets and carbon black are used as raw materials, weighed and mixed according to the raw material components of the graphene nanosheet / silicon carbide composite material, to obtain raw material powder. In an optional embodiment, the content of carbon black is between 0.5wt%-6wt%, and the size of the powder is between 0.1-1 μm. The content of graphene is between 1wt% and 10wt%, the thickness of the powder is between 0.3nm and 200nm, and the face size is between 1 and 15μm. The content of the boron carbide is between 0.5wt% and 3wt%, and the size of the powder is between 0.1 and 1 μm. Silicon carbide is the main phase, and the powder size is between 0.2-3μm. In an optional embodiment, the face size of the graphene nanosheets is more than 2 times, preferably 3 to 50 times, the size of the silicon carbide particles.

[0026] As an example of preparing raw material powder, sili...

Embodiment 1

[0033] 6wt% graphene nanosheets were ultrasonically dispersed in alcohol medium for 1h, while 0.5wt% boron carbide, 1wt% carbon black, and 92.5wt% silicon carbide were mixed on a planetary ball mill for 2h at a speed of 300rpm. The average size of the powder is: graphene nanosheet face 10μm, thickness 20nm; boron carbide 0.5μm; carbon black 0.6μm; silicon carbide 0.2μm. Then the ultrasonically dispersed graphene nanosheet slurry was poured into a planetary ball mill jar and mixed with other slurries for 4 hours. After drying for 12 hours, sieve the mixed powder with 200 mesh. Finally, the composite material is obtained by sintering at 2100°C and 40MPa. Its size is 100mm×100mm×20mm, and its fracture toughness is 8.0MPa m 1 / 2 , The flexural strength is 650MPa. figure 2 For the microscopic morphology of the graphene nanosheet / silicon carbide composite material prepared in Example 1, it can be seen from the figure that the silicon carbide grain size is below 2 μm.

Embodiment 2

[0035] 10wt% graphene nanosheets were ultrasonically dispersed in alcohol medium for 2h, while 0.8wt% boron carbide, 6wt% carbon black, and 83.2wt% silicon carbide were mixed on a planetary ball mill for 2h at a speed of 600rpm. The average size of the powder is: graphene nanosheet face 15μm, thickness 40nm; boron carbide 0.8μm; carbon black 1.0μm; silicon carbide 3μm. Then the ultrasonically dispersed graphene nanosheet slurry was poured into a planetary ball mill jar and mixed with other slurries for 6 hours. After drying for 12 hours, sieve the mixed powder with 200 mesh. Finally, the composite material is obtained by sintering at 2200°C and 40MPa. Its size is 300mm×300mm×150mm, and its fracture toughness is 7.0MPa m 1 / 2 , The flexural strength is 500MPa.

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Abstract

The invention provides a large-size and high-strength graphene nanosheet / silicon carbide composite material and a preparation method thereof. The preparation method comprises the following steps: withsilicon carbide, boron carbide, graphene nanosheets and carbon black as raw materials, weighing the raw materials, and carrying mixing so as to obtain a raw material powder, wherein raw material components comprise 81 to 98 wt% of the silicon carbide, 0.5 to 6 wt% of the carbon black, 0.5 to 3 wt% of the boron carbide and 1 to 10 wt% of the graphene nanosheets, and the contents of the componentssum to 100 wt%; and placing the obtained raw material powder into a mold, and carrying out hot-press sintering so as to obtain the graphene nanosheet / silicon carbide composite material, wherein the sintering temperature of hot-press sintering is 1900 to 2200 DEG C, and the sintering pressure of hot-press sintering is 20 to 80 MPa.

Description

technical field [0001] The invention relates to a large-size, high-strength graphene nanosheet / silicon carbide composite material and a preparation method thereof, belonging to the technical field of ceramic materials. Background technique [0002] Graphene is the material with the highest strength known, reaching 130Gpa, which is more than 100 times that of steel; the thermal conductivity is as high as 5300W / (m K), higher than carbon nanotubes and diamond; the electron mobility can reach 200000cm 2 / (V·s), higher than carbon nanotubes or silicon crystals. [0003] Silicon carbide (SiC) is a traditional structural-functional ceramic with small atomic radius, wide band gap, short bond length, and strong covalent bond, so it has excellent mechanical, thermal, electrical, chemical corrosion resistance, radiation resistance, and radiation resistance. , absorbing and other characteristics, are widely used in bulletproof armor, precision bearings, heat exchanger components, atomi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/575C04B35/577
CPCC04B35/575C04B2235/3821C04B2235/424C04B2235/425C04B2235/5292C04B2235/5436C04B2235/5445C04B2235/656C04B2235/658C04B2235/6581C04B2235/786C04B2235/96
Inventor 黄毅华江东亮黄政仁刘学建陈忠明
Owner SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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