Film forming method for grafting nitrogen-doped carbon quantum dots on surface of silicon nitride ceramic ball

A technology of silicon nitride ceramic balls and carbon quantum dots, which is applied in the field of friction and lubrication, can solve problems such as long-term dispersion and poor storage stability, difficult lubricity for industrial application, and complex synthesis methods, and achieve good lubrication effect, uniform size, The effect of preventing agglomeration

Active Publication Date: 2022-03-18
HANGZHOU DIANZI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, carbon nanomaterials such as fullerenes, carbon nanotubes, and graphene also have many disadvantages, such as: complex synthesis methods, high preparation costs, and long-term dispersion and storage of these carbon nanomaterials in base oil due to chemical inertness. Poor stability, it is difficult to fully exert its excellent lubricity and realize industrial application

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] The first step is to prepare nitrogen-doped carbon quantum dots. The specific process is:

[0034] (1) Weigh citric acid as a carbon source and L-arginine as a nitrogen source at a molar ratio of 1:1, place them in a beaker after weighing, and form a mixed powder.

[0035] (2) Measure deionized water with a mass ratio of 1:1 to the mixed powder and pour it into the beaker in step (1).

[0036] (3) At room temperature, magnetically stir the solution in the beaker of step (2) for 0.5 h with a magnetic stirrer to fully dissolve it until a transparent solution is formed.

[0037] (4) Put the magnetically stirred solution in the beaker into the reaction kettle, place the reaction kettle in a constant temperature drying oven, set the temperature at 220° C., and keep it warm for 3 hours. After the reaction, it was naturally cooled to room temperature, and the reaction kettle was taken out, and the transparent liquid turned into a dark brown liquid.

[0038] (5) Place the dar...

Embodiment 2

[0047] The first step is to prepare nitrogen-doped carbon quantum dots, the specific process:

[0048] (1) Weigh citric acid as the carbon source and L-arginine as the nitrogen source at a molar ratio of 1:2, place them in a beaker after weighing, and form a mixed powder.

[0049] (2) Use a graduated cylinder to measure deionized water with a mass ratio of 2:1 to the mixed powder and pour it into the beaker in step (1).

[0050] (3) At room temperature, magnetically stir the solution in the beaker of step (2) for 0.5 h with a magnetic stirrer to fully dissolve it until a transparent solution is formed.

[0051] (4) Put the magnetically stirred solution in the beaker into the reaction kettle, place the reaction kettle in a constant temperature drying oven, set the temperature at 180° C., and keep it warm for 4 hours. After the reaction, it was naturally cooled to room temperature, and the reaction kettle was taken out, and the transparent liquid turned into a dark brown liquid...

Embodiment 3

[0061] The first step is to prepare nitrogen-doped carbon quantum dots, the specific process:

[0062] (1) Weigh citric acid as the carbon source and L-arginine as the nitrogen source at a molar ratio of 1:3, place them in a beaker after weighing, and form a mixed powder.

[0063] (2) Use a graduated cylinder to measure deionized water with a mass ratio of 3:1 to the mixed powder and pour it into the beaker in step (1).

[0064] (3) At room temperature, magnetically stir the solution in the beaker of step (2) for 0.5 h with a magnetic stirrer to fully dissolve it until a transparent solution is formed.

[0065] (4) Put the magnetically stirred solution in the beaker into the reaction kettle, place the reaction kettle in a constant temperature drying oven, set the temperature at 220° C., and keep it warm for 3 hours. After the reaction, it was naturally cooled to room temperature, and the reaction kettle was taken out, and the transparent liquid turned into a dark brown liquid...

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Abstract

The invention discloses a film forming method for grafting nitrogen-doped carbon quantum dots on the surface of a silicon nitride ceramic ball. The film forming method comprises the following steps: grafting prepared gel containing the carbon quantum dots to the surface of the ceramic ball; when the nitrogen-doped carbon quantum dots are prepared, citric acid is used as a carbon source and L-arginine is used as a nitrogen source; the citric acid is subjected to peptide forming, dehydration and carbonization to form a carbon core, and carboxyl in the citric acid and amino in the arginine are subjected to peptide forming reaction to form a peptide bond; l-arginine is effectively modified to the surfaces of the carbon quantum dots through peptide bonds, the sizes of the prepared carbon quantum dots are more uniform, and agglomeration in lubricating oil is effectively prevented. When the silicon nitride ceramic ball is assembled in a water lubricated bearing to work, friction is reduced by the sphere-like carbon quantum dots in the water lubricated bearing in a micro rolling body form, and the carbon quantum dots contain a large number of oxygen-containing functional groups and react with silicon elements on the surfaces of the silicon nitride ceramic balls to generate a silicon dioxide chemical reaction film under the condition that high temperature is generated due to violent friction, so that the lubricating effect is better, and the service life of the silicon nitride ceramic ball is prolonged. And the lubricating film is more stable.

Description

technical field [0001] The invention belongs to the field of friction lubrication, in particular to a film forming method for grafting nitrogen-doped carbon quantum dots on the surface of silicon nitride ceramic balls. Background technique [0002] Under the background that all countries are promoting green environmental protection, traditional bearings seem out of place in this context. During lubrication, there will be countless lubricating oil leaks every year, polluting water resources and land, and causing great damage to fish and vegetation. Seriously, causing very bad environmental problems. In this regard, scientists and scholars from various countries have proposed water-lubricated bearings to replace traditional bearings. Compared with traditional bearings, the lubricant of water-lubricated bearings is changed from oil to water, and the bearing material is changed from metal to ceramic materials or engineering plastics. The lubrication mechanism of water-lubricat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B41/85
CPCC04B41/85C04B41/5001C04B41/009C04B41/50C04B41/4543C04B41/0072C04B35/584
Inventor 吴参夏强刘铮李帅帅
Owner HANGZHOU DIANZI UNIV
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