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Graphene composite B4C superhard material preparation method

A technology of graphene composite and superhard materials, which is applied in the field of preparing graphene composite B4C superhard materials by sintering with high temperature and high pressure equipment, which can solve the problems of harsh preparation conditions and difficult materials

Inactive Publication Date: 2015-11-04
INST OF FLUID PHYSICS CHINA ACAD OF ENG PHYSICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However for B 4 For C, the preparation conditions of this superhard material are demanding, and the normal pressure sintering temperature is greater than 2000°C. Can graphene composite be successfully carried out at such a high temperature and a graphene composite with significantly improved fracture toughness can be prepared? 4 C material has always been a big problem

Method used

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  • Graphene composite B4C superhard material preparation method
  • Graphene composite B4C superhard material preparation method
  • Graphene composite B4C superhard material preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] (1) Add 0.3g B 4 C mixed with graphene oxide with a volume fraction of 0.3%, added 20g of water, and ultrasonicated for 20min to obtain graphene oxide / B 4 C mixed solution; then stir with a magnetic stirrer for 3h to make it more uniform; finally the resulting graphene oxide / B 4 Mixed solution C was stirred and dried at 90° C. to obtain mixed powder.

[0022] (2) Compress the mixed powder into a cylindrical blank with a diameter of 8 mm and a height of 4 mm in a tablet press.

[0023] (3) Put the blank into a six-sided top press and sinter at 1400°C and 4.5GPa for 20min to obtain graphene composite B 4 C superhard material.

Embodiment 2

[0025] (1) Add 0.5g B 4 C mixed with graphene oxide with a volume fraction of 0.6%, added 30g of water, and ultrasonicated for 20min to obtain graphene oxide / B 4 C mixed solution, then stirred with a magnetic stirrer for 3h to make it more uniform, and finally the resulting graphene oxide / B 4 Mixed solution C was stirred and dried at 80° C. to obtain mixed powder.

[0026] (2) Compress the mixed powder into a cylindrical blank with a diameter of 8 mm and a height of 6 mm in a tablet press.

[0027] (3) Put the blank into a six-sided top press and sinter at 1350°C and 4.5GPa for 30min to obtain graphene composite B 4 C superhard material.

Embodiment 3

[0029] (1) Add 1g B 4 C is mixed with graphene oxide with a volume fraction of 0.9%, adding 25g of water, and ultrasonicating for 25min to obtain graphene oxide / B 4 C mixed solution, then stirred with a magnetic stirrer for 5h to make it more uniform, and finally the resulting graphene oxide / B 4 Mixed solution C was stirred and dried at 80° C. to obtain mixed powder.

[0030](2) Compress the mixed powder into a cylindrical blank with a diameter of 12 mm and a height of 5 mm in a tablet press.

[0031] (3) Put the blank into a six-sided top press and sinter at 1300°C and 5GPa for 25min to obtain graphene composite B 4 C superhard material.

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Abstract

A graphene composite B4C superhard material preparation method is characterized by comprising the following steps: graphene oxide with the sheet diameter greater than 1mum and the layer number not more than five is mixed with B4C powder with the particle size not more than 3mum, the graphene oxide volume fraction is 0.3% -5%, water with the mass of 20-40 times of the mass of the B4C are added for ultrasonic treatment for 10-30min to obtain a graphene oxide / B4C mixture liquid, the graphene oxide / B4C mixture liquid is stirred for 2h more for more uniform mixing, and finally the graphene oxide / B4C mixture liquid is stirred and dried at a drying temperature below 100 DEG C at atmospheric pressure to obtain mixed powder; the mixed powder is pre-pressed into an initial blank in a molding apparatus; the initial blank is put into a high temperature and high pressure apparatus for high pressure sintering to obtain a graphene composite B4C superhard material, wherein the sintering temperature 1300-1600 DEG C, the sintering pressure is greater than 3GPa, and the sintering time is greater than 10min. The superhard material is harder than 19GPa, the fracture toughness reaches 8.76MPa. m1 / 2, and the fracture toughness of the graphene composite B4C superhard material is improved by more than 1 times compared with that of a pure B4C material.

Description

technical field [0001] The invention relates to a method for preparing superhard materials, specifically preparing graphene composite B by sintering with high-temperature and high-pressure equipment 4 C method for superhard materials. Background technique [0002] With the needs of industrial development and the continuous breakthrough and innovation of material science, various new materials with high strength, high hardness, corrosion resistance and high temperature resistance have emerged as the times require. As an important part of this family, superhard materials have shown broad application prospects in the fields of machinery, electronics, computers, and aerospace. As an important member of the superhard material family, B 4 C has attracted much attention due to a series of excellent properties such as high strength, high hardness, high temperature resistance, wear resistance, and corrosion resistance. Its hardness is second only to diamond and cubic boron nitride....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/563C04B35/622
Inventor 刘利新王媛李绪海彭旭升徐亮操秀霞孟川民祝文军
Owner INST OF FLUID PHYSICS CHINA ACAD OF ENG PHYSICS
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