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Preparation method of super-smooth graphene molar structure coating

A graphene and coating technology, applied in the field of material technology and tribology, can solve the problem of unstable non-commensurate contact state, and achieve the effect of avoiding friction anisotropy

Active Publication Date: 2022-01-04
LANZHOU INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, the non-commensurate contact state is unstable and tends to spontaneously turn to the commensurate state during the friction process, thereby locking into a high-friction configuration, that is, the homogeneous structure superslip exhibits severe rotation angle dependence, also known as the frictional state. Anisotropy, which becomes more serious with the increase of the contact area during the friction process, while the structure with rigid polycrystalline surface forming multi-point contact can prevent the formation of commensurate contact
However, the preparation of graphene materials with stable molar structure and the realization of solid superslip phenomenon are still blank.

Method used

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  • Preparation method of super-smooth graphene molar structure coating

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preparation example Construction

[0018] A kind of preparation method of ultra-smooth graphene molar structure coating:

[0019] Mix the graphene powder and the grinding beads in the planetary ball mill according to the weight ratio (g / g) of 1:50~120, the volume of the graphene powder is less than 10% of the volume of the ball mill tank, and the speed is controlled at 50~600rpm Ball milling is carried out under the condition that the ball milling time is 5~100h, and the graphene molar structure film is prepared on the milling beads in the random rolling between the milling beads and the graphene powder by virtue of the ability of the graphene sheets to align.

[0020] Graphene powder has a clear flake shape and a smooth surface. The diameter of the sheet is between 20 and 500nm, the number of graphene layers in the sheet is less than 15, and the surface of the sheet has no obvious wrinkles and is smooth.

[0021] Grinding beads refer to one of steel balls, alumina balls, zirconia balls, silicon nitride balls ...

Embodiment 1

[0025] Embodiment 1 A kind of preparation method of ultra-smooth graphene molar structure coating:

[0026] Mix the graphene powder with a sheet diameter of about 200nm, the number of layers less than 10, smooth surface, and clear flakes with 5mm alumina grinding beads in a planetary ball mill at a weight ratio (g / g) of 1:100, and the graphene powder The volume of the body accounts for 8% of the volume of the ball mill tank, and the ball mill is carried out under the condition that the rotating speed is controlled at 200rpm and the ball milling time is 20h. Graphene molar structure films were prepared on grinding beads.

[0027] The graphene molar structure film is in parallel contact with the sheets, and the rotation angle between the sheets is 30 o , showing a non-commensurate contact state to produce moiré fringes; then the graphene moiré structure film and the hydrogen-containing carbon film form a friction pair, under 7N load, 10cm / s speed range, 1.1mm 2 Sp in the graph...

Embodiment 2

[0029] Embodiment 2 A kind of preparation method of ultra-smooth graphene molar structure coating:

[0030] Mix graphene powder with a diameter of about 20nm, layers less than 15, smooth surface, and clear flakes with 10mm alumina grinding beads in a planetary ball mill at a weight ratio (g / g) of 1:50, graphene powder The volume of the body accounts for 6% of the volume of the ball milling tank, and the ball milling is carried out under the condition that the rotating speed is controlled at 100rpm and the ball milling time is 50h. With the help of the ability of the graphene sheets to be oriented, in the random rolling between the grinding beads and the graphene powder, Graphene molar structure films were prepared on grinding beads.

[0031] The graphene molar structure film is in parallel contact with the sheets, and the rotation angle between the sheets is 20 o , showing a non-commensurate contact state to produce moiré fringes; then the graphene moiré structure film and th...

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Abstract

The invention relates to a preparation method of a super-smooth graphene molar structure coating, which comprises the following steps that: graphene powder is mixed with grinding beads in a planetary ball mill, and ball milling is carried out to obtain a graphene molar structure film; the graphene mole structure film is in sheet-to-sheet parallel contact, the rotation angle between sheet layers is 15-45 degrees, and the graphene mole structure film is in a non-common contact state to generate mole fringes; and the graphene molar structure film and a hydrogen-containing carbon film form a friction compatibility pair, sp3 bonded carbon in the graphene molar structure film is subjected to the action of friction heat and shear stress in different environmental atmospheres under the conditions that the load is 1-20 N, the speed range is 0.05-30 cm / s and the contact area is 0.28-3 mm<2>, interlayer-to-in-plane chemical bond steering occurs, and an in-layer defect-free super-smooth graphene coating is generated. The method is simple, green and efficient, and the obtained coating has a stable graphene molar structure and a friction coefficient of as low as 0.006.

Description

technical field [0001] The invention relates to the fields of material technology and tribology, in particular to a preparation method of an ultra-smooth graphene molar structure coating. Background technique [0002] With the development of high precision, high integration and high reliability of mechanical systems, the surface and interface effects of moving parts of mechanical systems are becoming more and more prominent, and the requirements for friction and wear are becoming more and more stringent. At the same time, according to statistics, friction causes 1 / 3 of the world's primary energy consumption, and 60% of component damage is caused by wear and tear. The direct economic loss caused by the two accounts for about 5% to 7% of the national GDP. Calculated on the basis of 5%, in 2019, the loss caused by friction and wear alone in my country will be as high as 4.95 trillion yuan. Therefore, further reducing friction, reducing wear, and prolonging the working life of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/194
CPCC01B32/194
Inventor 李瑞云张俊彦侯德良杨兴
Owner LANZHOU INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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