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Core-shell type nano ceramic powder based on graphene coating and preparation method of core-shell type nano ceramic powder

A nano-ceramic powder, graphene coating technology, applied in the direction of graphene, nano-carbon, chemical instruments and methods, etc., can solve the problems of reducing the reinforcement effect of the ceramic matrix, the difficulty of dispersion, the difficulty of the complete structure of graphene, etc. Dispersion effect, good dispersibility, excellent performance effect

Active Publication Date: 2022-08-05
WEIFANG VOCATIONAL COLLEGE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Graphene-enhanced ceramic composites have great advantages in all aspects of performance, and have very broad development prospects in different fields. However, the research on graphene-enhanced ceramic composites is still in its infancy. There are still a lot of problems to be solved before: (1) Due to the huge specific surface area of ​​graphene and the π-π conjugation that makes the sheets stacked on each other, it is relatively difficult to maintain its uniform dispersion in the ceramic matrix. It greatly limits the display of its excellent mechanical properties; (2) The interface compatibility between graphene and ceramic substrate is poor, making it difficult to achieve a strong interface bond between the two, and it is difficult to achieve in the process of deformation under force. The effective transfer of the load from the ceramic matrix to the graphene-reinforced phase; (3) when preparing graphene-reinforced ceramic materials, it is relatively more difficult to maintain the complete structure of graphene as much as possible. Destroy the internal structure of graphene, resulting in damage to the advantages of graphene in terms of mechanical properties, thereby reducing the reinforcement effect on the ceramic matrix In summary, in order to prepare graphene-modified ceramic composites with excellent performance, graphene Dispersion in ceramic matrix becomes key

Method used

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  • Core-shell type nano ceramic powder based on graphene coating and preparation method of core-shell type nano ceramic powder
  • Core-shell type nano ceramic powder based on graphene coating and preparation method of core-shell type nano ceramic powder
  • Core-shell type nano ceramic powder based on graphene coating and preparation method of core-shell type nano ceramic powder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] (1) Under the condition of room temperature water bath, 2.5mmol perylene-3,4,9,10-tetracarboxylic dianhydride and 40ml toluene were mixed for ultrasonic treatment for 15min, then 0.25mmol triethylenetetramine was added, and the reaction was refluxed at 55°C for 25h, After the reaction was completed, it was cooled to room temperature, and the reaction solution was filtered. The precipitate obtained by filtration was washed with toluene and ethanol, dried and added to a potassium hydroxide solution with a concentration of 10 wt %. The precipitate is washed with deionized water, the washed precipitate is dissolved in formic acid after vacuum drying, and excess isopropanol is added for precipitation treatment, and the polyamino cationic peryleneimide graphene dispersant is prepared after the precipitate is vacuum-dried;

[0034] (2) Mixing and stirring the above prepared polyamino cationic peryleneimide graphene dispersant and deionized water, then adding graphene, under the...

Embodiment 2

[0039] (1) Under the condition of water bath at room temperature, 2.5mmol of perylene-3,4,9,10-tetracarboxylic dianhydride and 40ml of toluene were mixed for ultrasonic treatment for 15min, then 0.2mmol of diethylenediamine was added, and the reaction was refluxed at 50°C for 25h. After the reaction was completed, it was cooled to room temperature, and the reaction solution was filtered. The precipitate obtained by filtration was washed with toluene and ethanol, dried and added to a potassium hydroxide solution with a concentration of 10 wt %. The precipitate is washed with deionized water, the washed precipitate is dissolved in formic acid after vacuum drying, and excess isopropanol is added for precipitation treatment, and the polyamino cationic peryleneimide graphene dispersant is prepared after the precipitate is vacuum-dried;

[0040] (2) Mix and stir the polyamino cationic peryleneimide graphene dispersant prepared above with deionized water, then add graphene, and under ...

Embodiment 3

[0044] (1) Under the condition of water bath at room temperature, 2.5mmol perylene-3,4,9,10-tetracarboxylic dianhydride and 40ml toluene were mixed for ultrasonic treatment for 15min, then 0.25mmol tetraethylenepentamine was added, and the reaction was refluxed at 50°C for 24h, After the reaction was completed, it was cooled to room temperature, and the reaction solution was filtered. The precipitate obtained by filtration was washed with toluene and ethanol, dried and added to a potassium hydroxide solution with a concentration of 10 wt %. The precipitate is washed with deionized water, the washed precipitate is dissolved in formic acid after vacuum drying, and excess isopropanol is added for precipitation treatment, and the polyamino cationic peryleneimide graphene dispersant is prepared after the precipitate is vacuum-dried;

[0045] (2) Mix and stir the polyamino cationic peryleneimide graphene dispersant prepared above with deionized water, then add graphene, and under the...

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Abstract

The invention discloses a preparation method of core-shell type nano ceramic powder based on graphene coating, which comprises the following steps: preparing a polyamino cationic perylene bisimide graphene dispersing agent by using perylene-3, 4, 9, 10-tetracarboxylic dianhydride and vinylamine as raw materials, and modifying graphene by using the polyamino cationic perylene bisimide graphene dispersing agent to prepare modified graphene dispersion liquid; the preparation method comprises the following steps: preparing a graphene dispersion liquid, preparing a modified nano ceramic powder suspension, slowly dropwise adding the modified nano ceramic powder suspension into the modified graphene dispersion liquid under an ultrasonic stirring condition, continuously stirring after dropwise adding, standing, finally filtering, washing a precipitate, and drying to obtain the core-shell type nano ceramic powder. The preparation method is easy to operate and low in cost, and the prepared core-shell type nano ceramic powder is good in dispersity and can well modify the performance of a material when being used for modification of a ceramic composite material.

Description

technical field [0001] The invention relates to the technical field of ceramic powder modification, in particular to a core-shell nano-ceramic powder coated with graphene and a preparation method thereof. Background technique [0002] Graphene is a new type of two-dimensional inorganic nanomaterial with a single layer of carbon atoms. It has received great attention due to its unique two-dimensional structure, large specific surface area, extremely high aspect ratio, and excellent thermal, electrical and mechanical properties. focus on. Due to its excellent physical and mechanical properties, graphene is considered to be an ideal reinforcement phase for ceramic matrix composites, and it is expected to improve the toughness of ceramic materials with a very small content. At the same time, graphene also has certain self-lubricating properties, which provides the possibility to further improve the friction and wear properties of the material. To this end, scholars at home and...

Claims

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Application Information

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IPC IPC(8): C04B35/10C04B35/48C04B35/56C04B35/565C04B35/58C04B35/584C04B35/628C09C1/46C09C3/08C01B32/194C01B32/19C01B32/186
CPCC04B35/10C04B35/48C04B35/565C04B35/5611C04B35/5626C04B35/58071C04B35/584C04B35/58C04B35/62839C01B32/194C01B32/186C01B32/19C09C1/46C09C3/08C01B2204/32C01B2204/04C01B2204/30C04B2235/5454C04B2235/5445Y02E60/10
Inventor 胡洋洋辛海明冯真真解永辉李永胜
Owner WEIFANG VOCATIONAL COLLEGE
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