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Quick in-situ preparation method of noctiluca-shaped graphene wrapped silicon carbide microsphere

A technology of olefin-coated silicon carbide and noctiluca, applied in the petroleum industry, additives, lubricating compositions, etc., can solve the problems affecting the performance of graphene lubricating oil additives and their industrial applications, scratches on the surface of friction pairs, and difficulty in dispersion and stability. , to achieve the effect of solving difficult to apply to lubricating oil additives, low cost, no impurity pollution

Active Publication Date: 2018-02-13
UNIV OF JINAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, graphene used as lubricating oil additives is mostly prepared by the modified Hummers method (Tribologyletters, 2011, 41(1): 209-215), which is very difficult to separate and transfer from water to oil and to disperse and stabilize in oil. Affecting the performance of graphene as a lubricating oil additive and its industrial application
Silicon carbide, also known as corundum because of its ultra-high hardness, can still play an effective role in rolling bearings under high loads. However, because of its ultra-high melting point and stability, most of the silicon carbide nanoparticles currently prepared have sharp edges. The corners may be hollow structures (Chemical Communications, 2014, 50(9): 1070-1073), which will cause scratches on the surface of the friction pair, and have not been studied as lubricant additives

Method used

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  • Quick in-situ preparation method of noctiluca-shaped graphene wrapped silicon carbide microsphere
  • Quick in-situ preparation method of noctiluca-shaped graphene wrapped silicon carbide microsphere
  • Quick in-situ preparation method of noctiluca-shaped graphene wrapped silicon carbide microsphere

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] (1) Weigh 500 mg of nano-silicon carbide powder (purity 99.9%, particle size less than 0.04-0.2 μm) into a beaker, add 50 mL of absolute ethanol, and ultrasonically disperse until there is no precipitation at the bottom of the beaker to form a uniform suspension;

[0034] (2) The suspension prepared in the above step (1) was irradiated with the argon-fluorine laser beam (193 nm) focused by a mirror and a convex lens, and the laser energy density was 0.8 J pulse -1 cm -1 , the frequency is 2 Hz, and the irradiation time is 20 min. During laser beam irradiation, the magnetic stirrer was set at 300 rpm -1 Stir the suspension at a constant speed;

[0035] (3) After irradiation, the suspension was centrifuged, then washed three times with a mixed acid solution (5 wt% hydrofluoric acid and 5 wt% hydrogen peroxide) and deionized water, and dried to obtain the product.

[0036] figure 1It is a transmission electron microscope picture of the original silicon carbide powder ...

Embodiment 2

[0039] (1) Weigh 250 mg of ultrafine silicon carbide powder (purity 99%, particle size 0.5-0.7 μm) into a beaker, add 50 mL of absolute ethanol, and ultrasonically disperse until there is no precipitation at the bottom of the beaker to form a uniform suspension;

[0040] (2) Irradiate the suspension prepared in the above step (1) with the krypton-fluorine laser beam (248 nm) focused by the mirror and the convex lens, and the laser energy density is 1.0 J pulse -1 cm -1 , the frequency is 10 Hz, and the irradiation time is 10 min. During laser beam irradiation, a magnetic stirrer was used at 700 rpm -1 Stir the suspension at a constant speed;

[0041] (3) After irradiation, the suspension was centrifuged, then washed three times with a mixed acid solution (10 wt% hydrofluoric acid and 10 wt% hydrogen peroxide) and deionized water, and dried to obtain the product. The appearance of the obtained product is similar to that of Example 1, and the particle size is 0.3-0.5 μm.

Embodiment 3

[0043] (1) Weigh 5 mg of nano-silicon carbide powder (purity 99.9%, particle size less than 0.04-0.2 μm) into a beaker, add 50 mL of absolute ethanol, and ultrasonically disperse until there is no precipitation at the bottom of the beaker to form a uniform suspension;

[0044] (2) The suspension prepared in the above step (1) was irradiated with the xenon-chlorine laser beam (308 nm) focused by the mirror and the convex lens, and the laser energy density was 1.2 J pulse -1 cm -1 , the frequency is 15 Hz, and the irradiation time is 5 min. During laser beam irradiation, a magnetic stirrer was used at 1000 r min -1 Stir the suspension at a constant speed;

[0045] (3) After irradiation, the suspension was centrifuged, washed three times with mixed acid solution (5 wt% hydrofluoric acid and 10 wt% hydrogen peroxide) and deionized water, and dried to obtain the product. The appearance of the obtained product is similar to that of Example 1, and the particle size is 0.1-0.2 μm....

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Abstract

The invention discloses a quick in-situ preparation method of a noctiluca-shaped graphene wrapped silicon carbide microsphere. The method comprises the following steps of dispersing silicon carbide particles in a liquid phase medium to form suspension with a certain concentration, aggregating irradiating pulse laser light with certain energy density to the suspension, allowing the silicon carbideparticles to achieve silicon carbide epitaxy graphene growth, partial multilayer graphene sheet stripping and irregular particle spheroidization in situ by the double action of light and heat of laserirradiation and quick cooling of a surrounding liquid environment, after irradiation, centrifuging, separating and pickling the suspension, and drying a precipitate to form the high-dispersity noctiluca-shaped graphene wrapped silicon carbide microsphere. The method is simple to operate; the preparation can be accomplished under a room temperature condition of normal temperature and pressure; thecost is low; a product is high in purity; and the graphene wrapped silicon carbide microsphere shows excellent dispersion stability and antiwear and friction-reducing performance in lubricating oil.

Description

technical field [0001] The invention relates to a rapid in-situ preparation method of luminous algae-shaped graphene-coated silicon carbide microspheres, in particular to a method for in-situ formation of luminous algae-shaped graphene-coated silicon carbide microspheres by irradiating silicon carbide powder with a simple liquid phase laser The method belongs to the technical field of preparation of micro-nano powder. Background technique [0002] Mechanical friction and wear are ubiquitous in modern industrial production and life. The existence of friction and wear not only leads to a large amount of energy loss, but also damages the surface of parts and components, seriously reducing the service life of equipment. The emergence of nanomaterials provides a new option for the development of lubricating oil additives and has attracted widespread attention. Two-dimensional layered materials, such as graphene and molybdenum disulfide, are prone to slip under shear and have a l...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10M125/00C10N30/04C10N30/06
CPCC10M125/00C10M2201/041C10M2201/10C10N2030/04C10N2030/06
Inventor 罗婷曹丙强王平
Owner UNIV OF JINAN
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