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Preparation method of graphene ball toughened SiCN ceramic

A technology of graphene spheres and graphene, which is applied in the field of SiCN ceramic preparation, can solve problems such as the complexity of the preparation process, and achieve the effects of simple conditions, high hardness, and improved compression resistance

Active Publication Date: 2015-04-01
中科润资科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Only a preparation method of graphene microspheres is reported, the preparation process of this method is complicated, and it has not been applied in practice.
[0004] How to apply graphene spheres to the toughening of SiCN ceramics to improve the mechanical properties of SiCN ceramics while simplifying the preparation method of graphene spheres has not yet been seen.

Method used

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  • Preparation method of graphene ball toughened SiCN ceramic
  • Preparation method of graphene ball toughened SiCN ceramic

Examples

Experimental program
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Effect test

Embodiment 1

[0022] This embodiment prepares graphene sphere toughened SiCN ceramics, comprising the following steps:

[0023] 1. Ultrasonic clean the beaker twice with deionized water and absolute ethanol respectively, and dry it. Weigh 5 mg of graphene oxide in a beaker with an electronic balance with an accuracy of 0.1 mg. Use a graduated cylinder to measure 5ml of absolute ethanol into the beaker and seal it quickly. Put it into an ultrasonic cleaning machine and sonicate at a power of 220W for 30 minutes to obtain a graphene oxide absolute ethanol dispersion A with a concentration of 1 mg / ml.

[0024] 2. Weigh 3g of polysilazane in a beaker with an electronic balance, measure 1ml of dispersion A with a measuring cylinder and add it to the polysilazane liquid, stir for 30min to obtain mixed solution B.

[0025] 3. Add the mixed solution B into a container folded with tinfoil, put it into a tube furnace, and cross-link in a nitrogen atmosphere. The crosslinking temperature was 300°C,...

Embodiment 2

[0032] This embodiment prepares graphene sphere toughened SiCN ceramics, comprising the following steps:

[0033] 1. Ultrasonic clean the beaker twice with deionized water and absolute ethanol respectively, and dry it. Weigh 10 mg of graphene oxide into a beaker with an electronic balance with an accuracy of 0.1 mg. Use a graduated cylinder to measure 5ml of absolute ethanol into the beaker and seal it quickly. Put it into an ultrasonic cleaning machine and ultrasonicate at a power of 220W for 30 minutes to obtain a graphene oxide absolute ethanol dispersion A with a concentration of 2 mg / ml.

[0034] 2. Weigh 3g of polysilazane in a beaker with an electronic balance, measure 1ml of dispersion A with a measuring cylinder and add it to the polysilazane liquid, stir for 1 hour, and ultrasonicate for 30 minutes to obtain mixed solution B.

[0035] 3. Add the mixed solution B into a container folded with tinfoil, put it into a tube furnace, and cross-link in a nitrogen atmospher...

Embodiment 3

[0042] This embodiment prepares graphene sphere toughened SiCN ceramics, comprising the following steps:

[0043]1. Ultrasonic clean the beaker twice with deionized water and absolute ethanol respectively, and dry it. Weigh 10 mg of graphene oxide into a beaker with an electronic balance with an accuracy of 0.1 mg. Use a graduated cylinder to measure 5ml of absolute ethanol into the beaker and seal it quickly. Put it into an ultrasonic cleaning machine and ultrasonicate at a power of 220W for 30 minutes to obtain a graphene oxide absolute ethanol dispersion A with a concentration of 2 mg / ml.

[0044] 2. Weigh 3g of polysilazane in a beaker with an electronic balance, measure 1ml of dispersion A with a measuring cylinder and add it to the polysilazane liquid, stir for 1 hour, and ultrasonicate for 30 minutes to obtain mixed solution B.

[0045] 3. Add the mixed solution B into a container folded with tinfoil, put it into a tube furnace, and cross-link in a nitrogen atmosphere...

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Abstract

The invention provides a preparation method of graphene ball toughened SiCN ceramic and relates to a SiCN ceramic preparation method. The preparation method comprises the following steps: 1) preparing a graphene oxide anhydrous ethyl alcohol dispersion solution : an anhydrous ethyl alcohol solution is added in to graphene oxide, and a container is closed and then placed in an ultrasonic machine for ultrasonic dispersion to obtain the graphene oxide anhydrous ethyl alcohol dispersion solution; 2) preparing a mixed solution of the graphene oxide anhydrous ethyl alcohol dispersion solution and polysilazane: the graphene oxide anhydrous ethyl alcohol dispersion solution obtained in step 1) is added into a polysilazane solution, dicumyl peroxide is added into the polysilazane solution, the container is closed, and then stirring and ultrasonic treatment are conducted to obtain the mixed solution of the graphene oxide anhydrous ethyl alcohol dispersion solution and polysilazane; 3) preparing the graphene ball toughened SiCN ceramic: the mixed solution is subjected to thermal crosslinking in an inert atmosphere, so that the flavescent liquid changes into black solid polysilazane, the black solid polysilazane is ground into powder, the powder is hot-pressed into biscuits, and the biscuits are pyrolyzed under the protection of inert gas to obtain the product.

Description

technical field [0001] The invention relates to a method for preparing SiCN ceramics, in particular to a method for preparing SiCN ceramics toughened by graphene spheres. Background technique [0002] SiCN ceramics prepared by pyrolysis of polymer precursor polysilazane have excellent properties such as high temperature resistance, corrosion resistance, and oxidation resistance. The preparation process is simple, the design is strong, and the molding temperature is low, but the strength and hardness are low. This limits the application of SiCN ceramics in harsh environments. Graphene is a carbon atom SP 2 A new material with a hexagonal single-layer sheet structure composed of hybrid orbitals in a honeycomb lattice is the thinnest and hardest nanomaterial known in the world. Therefore, graphene has been widely used by researchers to improve the mechanical properties of materials in recent years. [0003] At present, research on graphene spheres has only been reported in a...

Claims

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Application Information

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IPC IPC(8): C04B35/78C04B35/58C04B35/622
Inventor 余煜玺黄奇凡李燕罗珂
Owner 中科润资科技股份有限公司
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