Graphene/boron carbide ceramic composite material and preparation method thereof

A boron carbide ceramic and composite material technology is applied in the field of graphene/boron carbide ceramic composite materials and their preparation, which can solve the problem that graphene and ceramic substrates cannot form a contact interface, reduce the performance of graphene/ceramic composite materials, and destroy graphene. Microstructure and other problems, to achieve the effect of easy EDM, easy industrial enlargement, and avoid the phenomenon of agglomeration

Inactive Publication Date: 2018-01-09
SHANGHAI UNIV OF ENG SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the large specific surface area and high surface energy of graphene, it is easy to agglomerate
The agglomeration of graphene will cause structural defects such as pores, so that graphene and ceramic substrates cannot form a good contact interface, destroying the microstructure of graphene, thereby reducing the performance of graphene / ceramic composites

Method used

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  • Graphene/boron carbide ceramic composite material and preparation method thereof
  • Graphene/boron carbide ceramic composite material and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0028] A preparation method of graphene / boron carbide ceramic composite material, the method comprises the following steps:

[0029] Step 1, adding graphene oxide, boron carbide and elemental silicon powder with a mass ratio of 10:85:5 to absolute ethanol, so that the mass of absolute ethanol accounts for 15% of the total mass, and graphite oxide is obtained after ultrasonic dispersion ene / boron carbide dispersion. After the graphene oxide / boron carbide dispersion is uniformly mixed by ball milling, spray granulation to obtain graphene oxide / boron carbide mixed powder;

[0030] Step 2: Place the graphene oxide / boron carbide mixed powder obtained in Step 1 in a graphite mold, heat up to 1950°C at a rate of 10°C / min, apply a pressing pressure of 100MPa to the powder, and keep it warm for 2 hours. With the cooling of the furnace, the whole sintering process is completed under the protective atmosphere of flowing argon, and the graphene / boron carbide ceramic composite material is...

Embodiment 2

[0035] A preparation method of graphene / boron carbide ceramic composite material, the method comprises the following steps:

[0036] Step 1, adding graphene oxide, boron carbide, elemental boron and amorphous carbon powder with a mass ratio of 8:85:3:4 to absolute ethanol so that the mass of absolute ethanol accounts for 20% of the total mass, After ultrasonic dispersion, a graphene oxide / boron carbide dispersion is obtained. After the graphene oxide / boron carbide dispersion is uniformly mixed by ball milling, spray granulation to obtain graphene oxide / boron carbide mixed powder;

[0037] Step 2: Place the graphene oxide / boron carbide mixed powder obtained in Step 1 in a graphite mold, heat up to 2000°C at a rate of 20°C / min, apply a pressing pressure of 80MPa to the powder, and keep it warm for 3 hours. With the cooling of the furnace, the whole sintering process is completed under the protective atmosphere of flowing argon, and the graphene / boron carbide ceramic composite m...

Embodiment 3

[0040] A kind of graphene / boron carbide ceramic composite material, its preparation method specifically comprises the following steps:

[0041] 1) respectively adding graphene oxide, boron carbide and sintering aid (silicon) into an organic solvent (absolute ethanol) in a mass ratio of 7:87:10, and mixing uniformly to obtain a graphene oxide / boron carbide dispersion;

[0042] 2) After the graphene oxide / boron carbide dispersion is mixed with a ball mill, spray granulation is carried out at a spray pressure of 0.07MPa, an inlet temperature of 120°C, and an outlet temperature of 75°C to obtain a graphene oxide / boron carbide mixture Powder, the particle size of the graphene oxide / boron carbide mixed powder is 45 μm;

[0043] 3) Put the graphene oxide / boron carbide mixed powder in the mold, and raise it from room temperature to 2000°C at a rate of 20°C / min under the protective atmosphere of flowing argon, and then hold it at a pressing pressure of 100MPa for 1.8h , complete the h...

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Abstract

The invention relates to a graphene/boron carbide ceramic composite material and a preparation method thereof. The preparation method specifically comprises steps as follows: 1), graphene oxide, boroncarbide and a sintering aid are added to an organic solvent and mixed uniformly, and a graphene oxide/boron carbide dispersion liquid is obtained; 2), after the graphene oxide/boron carbide dispersion liquid is subjected to ball-mill mixing by a ball mill, a product is subjected to spray granulation, and graphene oxide/boron carbide mixed powder is obtained; 3), the graphene oxide/boron carbide mixed powder is placed in a die and subjected to hot-press reaction sintering, and the graphene/boron carbide ceramic composite material is obtained after cooling, wherein compactness of the material is higher than or equal to 98%, bending strength is higher than or equal to 350 MPa, hardness is higher than or equal to 29 GPa, and fracture toughness is higher than or equal to 5 MPa.m<1/2>. Comparedwith the prior art, agglomeration in the sintering process is avoided, comprehensive performance of the material is excellent, the preparation process is simple, and follow-up electric spark machining is facilitated.

Description

technical field [0001] The invention belongs to the technical field of inorganic non-metallic materials, and relates to a graphene / boron carbide ceramic composite material and a preparation method thereof. Background technique [0002] Boron carbide ceramics have excellent properties such as light weight, high hardness, high temperature resistance, wear resistance and corrosion resistance, and are widely used in machinery, nuclear power, marine engineering and other fields. However, due to the high brittleness of boron carbide ceramics and the difficulty of sintering, it is difficult to fully exert its performance. [0003] Graphene is a two-dimensional nanomaterial with huge specific surface area and excellent mechanical properties. It is an ideal ceramic reinforcement, which can improve the bending strength of ceramic materials by improving the toughness of ceramic materials. However, graphene is prone to agglomeration due to its large specific surface area and high surfa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/563C04B35/622C04B35/645
Inventor 额真夫林文松李健宏汪明岳
Owner SHANGHAI UNIV OF ENG SCI
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