Graphene/boron carbide composite powder for hot pressed sintering, preparation method thereof and preparation method of ceramic product

A technology for hot-pressing sintering and composite powder, which is applied in the fields of graphene/boron carbide composite powder for hot-pressing sintering and its preparation and the preparation of ceramic products, and can solve the problem of difficulty in uniform dispersion, difficult processing, and low toughness of hot-pressed boron carbide ceramics. and other problems, to achieve the effect of improving sintering density, improving sintering activity, improving fracture toughness and electrical conductivity

Pending Publication Date: 2020-11-13
ZHEJIANG LIGHT TOUGH COMPOSITE MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The invention overcomes the shortcomings of the prior art and solves the problem that the components in the existing graphene / boron carbide ceramic composite powder are difficult to uniformly disperse in the water dispersion medium
Graphene in composite ceramics provides a conductive channel for boron carbide ceramics, thereby improving the fracture toughness and conductivity of hot-pressed boron carbide ceramics at the same time, and solving the problems of low toughness and difficulty in subsequent processing of hot-pressed boron carbide ceramics

Method used

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  • Graphene/boron carbide composite powder for hot pressed sintering, preparation method thereof and preparation method of ceramic product
  • Graphene/boron carbide composite powder for hot pressed sintering, preparation method thereof and preparation method of ceramic product
  • Graphene/boron carbide composite powder for hot pressed sintering, preparation method thereof and preparation method of ceramic product

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Embodiment 1, a hot-pressed sintered graphene / boron carbide spherical composite powder, boron carbide powder, graphene oxide powder, and syrup constitute the main material of the raw material powder, and its composition mass percentages are respectively: boron carbide powder: 80%, oxidized Graphene powder: 12%: syrup: 8%;

[0034] A method for preparing hot-pressed sintered graphene / boron carbide spherical composite powder and ceramic products, the specific steps are as follows:

[0035] Step 1) Mixing, mixing boron carbide powder, graphene oxide and syrup according to the above ratio, adding deionized water, adjusting the solid content to 50%, wet grinding in a ball mill for 60 minutes; then adding the dispersant PVP to the slurry, adding The amount is 4.5g per kilogram of slurry, and then continue ball milling for 24h; finally add defoamer n-octanol, the addition is 0.3ml per kilogram of slurry, eliminate the bubbles in the stirring process, and obtain mixed slurry; t...

Embodiment 2

[0039] Embodiment 2, a hot-pressed sintered graphene / boron carbide spherical composite powder, boron carbide powder, graphene oxide powder, and syrup constitute the main material of the raw material powder, and its composition mass percentages are respectively: boron carbide powder: 85%, oxidized Graphene powder: 10%: syrup: 5%;

[0040] A method for preparing hot-pressed sintered graphene / boron carbide spherical composite powder and ceramic products, the specific steps are as follows:

[0041] Step 1) mixing, mixing boron carbide powder, graphene oxide and syrup according to the above ratio, adding deionized water, adjusting the solid content to 50%, and wet grinding in a ball mill for 60 minutes; then N-methylpyrrolidone (NMP) Add the slurry in an amount of 5 g per kilogram of slurry, and then continue ball milling for 24 hours; finally add the defoamer n-octanol in an amount of 0.4 ml per kilogram of slurry to eliminate air bubbles during the stirring process to obtain a mi...

Embodiment 3

[0045] Embodiment three, a hot-pressed sintered graphene / boron carbide spherical composite powder, boron carbide powder, graphene oxide powder, and syrup constitute the main material of the raw material powder, and its composition mass percentages are respectively: boron carbide powder: 75%, oxidized Graphene powder: 15%: syrup: 10%;

[0046] A method for preparing hot-pressed sintered graphene / boron carbide spherical composite powder and ceramic products, the specific steps are as follows:

[0047] Step 1) Mixing, mixing boron carbide powder, graphene oxide and syrup according to the above ratio, adding deionized water, adjusting the solid content to 50%, wet grinding in a ball mill for 60 minutes; then adding the dispersant PVP to the slurry, adding The amount is 5g per kilogram of slurry, and then continue ball milling for 24h; finally add defoamer n-octanol, the addition is 0.4ml per kilogram of slurry, to eliminate the bubbles in the stirring process, to obtain mixed slur...

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Abstract

The invention discloses graphene/boron carbide composite powder for hot pressed sintering, a preparation method thereof and a preparation method of a ceramic product, and belongs to the field of ceramic materials. Boron carbide powder, graphene oxide and syrup are used as raw materials; atomization granulation and precursor carbonization processes are carried out to obtain the spherical graphene oxide/boron carbide composite powder with uniform component composition; and hot pressed sintering is performed to obtain the graphene/boron carbide composite ceramic with good component structure uniformity. According to the preparation method of the graphene/boron carbide composite powder, all the components of the composite powder are mixed in proportion and subjected to wet grinding to obtain stably-dispersed slurry, spherical composite powder with uniform components is obtained through an atomization granulation process, the obtained atomization granulation powder is subjected to carbonization and hot pressed sintering in a vacuum environment, and a graphene/boron carbide composite ceramic product with uniformly-dispersed graphene is obtained. The problems of large component segregation, difficult process amplification and the like of the graphene/boron carbide composite powder are solved, and the preparation method is suitable for preparing the graphene/boron carbide composite ceramic material with an excellent performance through hot pressed sintering.

Description

technical field [0001] The invention belongs to a powder-making method in the preparation technology of boron carbide ceramics, and in particular relates to the preparation of a graphene / boron carbide composite powder and a ceramic product used for hot-pressing sintering. Background technique [0002] Boron carbide has the properties of high hardness, low density, wear resistance, stable chemical properties, and excellent neutron absorption capacity. It plays an irreplaceable important role in the fields of bulletproof armor materials, wear-resistant materials, high-temperature structural materials, and nuclear reactor materials. However, boron carbide ceramics are brittle and have low fracture toughness. In order to improve their engineering practical value, it is usually necessary to add appropriate toughening components to boron carbide ceramics to improve their fracture toughness and flexural strength. On the other hand, boron carbide ceramics have high hardness and are ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/563C04B35/626C04B35/634C04B35/632C04B35/645
CPCC04B35/563C04B35/62615C04B35/62695C04B35/63444C04B35/632C04B35/645C04B2235/425C04B2235/48C04B2235/96
Inventor 林文松
Owner ZHEJIANG LIGHT TOUGH COMPOSITE MATERIALS
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