CN113880080A - Preparation method of ultra-smooth graphene molar structure coating - Google Patents
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- CN113880080A CN113880080A CN202111349856.6A CN202111349856A CN113880080A CN 113880080 A CN113880080 A CN 113880080A CN 202111349856 A CN202111349856 A CN 202111349856A CN 113880080 A CN113880080 A CN 113880080A
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Abstract
The invention relates to a preparation method of a super-smooth graphene molar structure coating, which is characterized in that graphene powder is mixed with grinding beads in a planetary ball mill, and a graphene molar structure film is obtained through ball milling; the graphene mole structure film is in parallel contact through the sheets, and the rotation angle between the sheets is 15-45oIn a non-metric contact state to generate Moire fringes; then, the graphene film with the molar structure and the hydrogen-containing carbon film form a friction compatibility pair, and the friction compatibility pair is carried out in different environment atmospheres at the load of 1-20N, the speed range of 0.05-30 cm/s and the speed of 0.28-3 mm2Sp in graphene molar structure film under condition of contact area3The bonded carbon is subjected to the action of frictional heat and shear stress, and the inter-layer in-plane chemical bond steering is generated, so that the in-layer defect-free ultra-smooth graphene coating is generated. The method is simple, green and efficient, and the obtained coating has a stable graphene molar structure and the friction coefficient of the coating can be as low as 0.006.
Description
Technical Field
The invention relates to the field of material technology and tribology, in particular to a preparation method of a super-smooth graphene molar structure coating.
Background
With the development of high precision, high integration and high reliability of mechanical systems, the surface interface effect of moving parts of the mechanical systems is more and more prominent, and the requirements on frictional wear are more and more strict. Also, friction is statistically responsible for the one-time energy consumption of 1/3 worldwide, with 60% of component damage being caused by wear. The direct economic loss caused by the two accounts for about 5% -7% of national GDP. Calculated according to 5 percent, the loss of China in 2019 caused by friction and abrasion is as high as 4.95 trillion yuan. Further reduction of friction, reduction of wear, and extension of the working life of moving parts are therefore one of the core problems of lubrication technology.
Due to the special layered structure and extremely weak van der waals force in the layers, the graphene can effectively reduce friction and abrasion, attracts the attention of the scientific and engineering communities, and has wide application potential in the engineering field. The graphene antifriction potential and even ultra-smooth realization are all established on the basis of non-metric contact, namely the graphene layer is twisted along with the angle, so that the molar stripes gradually appear along with the increase of the area of a contact area, the substrate of an upper layer structure is subjected to stick-slip motion, and along with the increase of the contact area, the heterojunction expression layer is converted from the stick-slip motion (high friction) to the smooth sliding motion (ultra-smooth).
However, the non-metric contact state is unstable and tends to spontaneously switch to the metric state during rubbing, thereby locking to a high-friction configuration, i.e. the homostructural ultra-slip exhibits severe corner dependence, also known as rubbing anisotropy, and becomes more severe as the contact area increases during rubbing, while the structure with rigid polycrystalline surfaces forming multi-point contacts may prevent the formation of the metric contact. But the current method for preparing graphene materials with stable molar structures and realizing solid ultra-slip phenomenon is still blank.
Disclosure of Invention
The invention aims to provide a simple and efficient preparation method of a super-smooth graphene molar structure coating.
In order to solve the problems, the preparation method of the ultra-smooth graphene molar structure coating is characterized by comprising the following steps: the method comprises the following steps of mixing graphene powder and grinding beads in a planetary ball mill according to a ratio of 1: mixing the materials in a weight ratio of 50-120, and performing ball milling to obtain a graphene film with a molar structure; graphene mole structure film is contacted through lamella parallel, and rotation angle between lamella is at 15~45oIn a non-metric contact state to generate Moire fringes; then the product is mixed withThe graphene film with the molar structure and the hydrogen-containing carbon film form a friction compatibility pair, and the friction compatibility pair is applied to different environments and under the load of 1-20N, the speed range of 0.05-30 cm/s and the speed of 0.28-3 mm2Sp in graphene molar structure film under condition of contact area3The bonded carbon is subjected to the action of frictional heat and shear stress, and the inter-layer in-plane chemical bond steering is generated, so that the in-layer defect-free ultra-smooth graphene coating is generated.
The sheet diameter of the graphene powder is 20-500nm, the number of graphene layers in each sheet layer is less than 15, and the sheet surface is free of obvious wrinkles and smooth.
The ball milling condition means that the volume of the graphene powder is less than 10% of the volume of the ball milling tank, the rotating speed is controlled to be 50-600 rpm, and the ball milling time is 5-100 h.
And a solvent is also added in the ball milling process.
The solvent includes but is not limited to one of ethanol, water, N-dimethylformamide.
The grinding bead is one of a steel ball, an alumina ball, a zirconia ball, a silicon nitride ball and a silicon carbide ball with the surface roughness of Ra 3-5 mu m and the ball diameter of 1-20 mm.
The different environment atmospheres comprise nitrogen, argon, vacuum and different humidity environments.
Compared with the prior art, the invention has the following advantages:
1. the method selects the graphene sheet-shaped powder with the sheet diameter of 20-500nm, the number of graphene layers in the sheet is less than 15, and the surface is smooth, and the graphene sheets are wrapped on the surface of a sphere by virtue of the capability of directional arrangement of the graphene sheets in random rolling between the graphene sheets and grinding beads, and generate stable contact mole stripes, so that the friction anisotropy of a graphene material is avoided, and the solid ultra-smoothness is realized.
2. The method is simple, green and efficient, and the obtained coating has a stable graphene molar structure and the friction coefficient of the coating can be as low as 0.006.
Drawings
The following describes embodiments of the present invention in further detail with reference to the accompanying drawings.
FIG. 1 shows the preparation of zirconia balls according to example 1 of the present inventionThe graphene molar structure coating is 7N, 10cm/s and 1.1mm2Friction coefficient plot under the conditions.
Detailed Description
A preparation method of a super-smooth graphene molar structure coating comprises the following steps:
mixing graphene powder and grinding beads in a planetary ball mill according to the proportion of 1: mixing the powder with a weight ratio (g/g) of 50-120, wherein the volume of the graphene powder is less than 10% of the volume of a ball milling tank, ball milling is carried out under the conditions that the rotating speed is controlled between 50-600 rpm and the ball milling time is 5-100 h, and the graphene film with the molar structure is prepared on the grinding beads in the random rolling process between the grinding beads and the graphene powder by means of the directional arrangement capacity of graphene sheets.
The graphene powder has the characteristics of clear sheet shape and smooth surface. The sheet diameter is 20-500nm, the number of graphene layers in the sheet layer is less than 15, and the surface of the sheet is free from obvious wrinkles and is smooth.
The grinding bead is one of a steel ball, an alumina ball, a zirconia ball, a silicon nitride ball and a silicon carbide ball with surface roughness Ra 3-5 μm and a ball diameter of 1-20 mm.
A small amount of solvent can be added in the ball milling process to generate sp between the lamella3And carbon is bonded, so that the graphene molar structure stably exists, and conditions are provided for realizing subsequent ultra-smoothness. The solvent includes, but is not limited to, one of ethanol, water, N-dimethylformamide.
The graphene mole structure film is in parallel contact through the sheets, and the rotation angle between the sheets is 15-45oIn a non-metric contact state to generate Moire fringes; then, the graphene film with the molar structure and the hydrogen-containing carbon film form a friction compatibility pair, and the friction compatibility pair is applied to different environment atmospheres including nitrogen, argon, vacuum and different humidity environments under the conditions of 1-20N load, 0.05-30 cm/s speed range and 0.28-3 mm2Sp in graphene molar structure film under condition of contact area3The bonded carbon is subjected to the action of frictional heat and shear stress, and the inter-layer in-plane chemical bond steering is generated, so that the in-layer defect-free ultra-smooth graphene coating is generated.
The transition of the graphene molar structure film towards the graphene with no defects in the layer can eliminate interlayer sliding resistance, lead to low shear strength in the friction direction, reduce the friction coefficient of a sliding system to be below 0.01 and realize ultra-smoothness.
Embodiment 1 a method for preparing a coating with ultra-smooth graphene molar structure:
mixing graphene powder with the sheet diameter of about 200nm, the number of layers less than 10, smooth surface and clear sheet shape with 5mm alumina grinding beads in a planetary ball mill according to the weight ratio of 1: 100 (g/g), wherein the volume of the graphene powder accounts for 8% of the volume of the ball milling tank, ball milling is carried out under the conditions that the rotating speed is controlled at 200rpm and the ball milling time is 20h, and the graphene film with the graphene molar structure is prepared on grinding beads in the random rolling process between the grinding beads and the graphene powder by virtue of the directional arrangement capacity of graphene sheets.
The graphene molar structure thin films are in parallel contact through the sheets, and the rotation angle between the sheets is 30oPresenting a non-metric contact state to produce moire fringes; then the graphene film with the molar structure and the hydrogen-containing carbon film form a friction compatibility pair within the speed range of 10cm/s and the load of 7N and the thickness of 1.1mm2Sp in graphene molar structure film under condition of contact area3The bonded carbon is subjected to the action of frictional heat and shear stress, and the inter-layer in-plane chemical bond steering is generated, so that the in-layer defect-free ultra-smooth graphene coating is generated.
The transition of the graphene molar structure film towards the graphene with no defects in the layer can eliminate interlayer sliding resistance, lead to low shear strength in the friction direction and realize super-smoothness with the hydrogen-carbon film under the nitrogen atmosphere. The resulting coating was tested to have a coefficient of friction of 0.006 (see fig. 1).
Embodiment 2 a method for preparing a coating with ultra-smooth graphene molar structure:
mixing graphene powder with the sheet diameter of about 20nm, the number of layers of less than 15, smooth surface and clear sheets with 10mm alumina grinding beads in a planetary ball mill according to the weight ratio (g/g) of 1:50, wherein the volume of the graphene powder accounts for 6% of the volume of a ball milling tank, carrying out ball milling under the conditions that the rotating speed is controlled at 100rpm and the ball milling time is 50h, and preparing the graphene film with the molar structure on the grinding beads in the random rolling process between the grinding beads and the graphene powder by means of the directional arrangement capacity of the graphene sheets.
The graphene molar structure thin films are in parallel contact through the sheets, and the rotation angle between the sheets is 20oPresenting a non-metric contact state to produce moire fringes; then the graphene film with the molar structure and the hydrogen-containing carbon film form a friction compatibility pair within the speed range of 5cm/s and the load of 5N and the speed of 2.1mm2Sp in graphene molar structure film under condition of contact area3The bonded carbon is subjected to the action of frictional heat and shear stress, and the inter-layer in-plane chemical bond steering is generated, so that the in-layer defect-free ultra-smooth graphene coating is generated.
The conversion of graphene mol structure film towards the graphene with no defects in the layer will eliminate the interlayer sliding resistance, lead to low shear strength in the friction direction, realize super-lubricity with the hydrogen-containing carbon film under the argon atmosphere, and the friction coefficient is 0.009.
Embodiment 3 a method for preparing a coating with ultra-smooth graphene molar structure:
mixing graphene powder with the sheet diameter of about 500nm, the number of layers of less than 10, smooth surface and clear sheets with 3mm steel ball milling beads in a planetary ball mill according to the weight ratio (g/g) of 1:120, wherein the volume of the graphene powder accounts for 15% of the volume of a ball milling tank, carrying out ball milling under the conditions that the rotating speed is controlled at 600rpm and the ball milling time is 100h, and preparing the graphene film with the molar structure on the milling beads in the random rolling process between the milling beads and the graphene powder by means of the directional arrangement capacity of graphene sheets.
The graphene molar structure thin films are in parallel contact through the sheets, and the rotation angle between the sheets is 40oPresenting a non-metric contact state to produce moire fringes; then the graphene film with the molar structure and the hydrogen-containing carbon film form a friction compatibility pair within the speed range of 25cm/s and 0.28mm under the load of 5N2Sp in graphene molar structure film under condition of contact area3The bonded carbon is subjected to the action of frictional heat and shear stress, and the inter-layer in-plane chemical bond steering is generated, so that the in-layer defect-free ultra-smooth graphene coating is generated.
The transition of graphene mol structure film towards the graphene with no defects in the layer will eliminate the interlayer sliding resistance, lead to low shear strength in the friction direction, realize super-lubricity with the hydrogen-containing carbon film under nitrogen atmosphere, and the friction coefficient is 0.009.
Claims (7)
1. A preparation method of a super-smooth graphene molar structure coating is characterized by comprising the following steps: the method comprises the following steps of mixing graphene powder and grinding beads in a planetary ball mill according to a ratio of 1: mixing the materials in a weight ratio of 50-120, and performing ball milling to obtain a graphene film with a molar structure; graphene mole structure film is contacted through lamella parallel, and rotation angle between lamella is at 15~45oIn a non-metric contact state to generate Moire fringes; then, the graphene film with the molar structure and the hydrogen-containing carbon film form a friction compatibility pair, and the friction compatibility pair is carried out in different environment atmospheres at the load of 1-20N, the speed range of 0.05-30 cm/s and the speed of 0.28-3 mm2Sp in graphene molar structure film under condition of contact area3The bonded carbon is subjected to the action of frictional heat and shear stress, and the inter-layer in-plane chemical bond steering is generated, so that the in-layer defect-free ultra-smooth graphene coating is generated.
2. The method for preparing the ultra-smooth graphene molar structure coating according to claim 1, wherein the method comprises the following steps: the sheet diameter of the graphene powder is 20-500nm, the number of graphene layers in each sheet layer is less than 15, and the sheet surface is free of obvious wrinkles and smooth.
3. The method for preparing the ultra-smooth graphene molar structure coating according to claim 1, wherein the method comprises the following steps: the ball milling condition means that the volume of the graphene powder is less than 10% of the volume of the ball milling tank, the rotating speed is controlled to be 50-600 rpm, and the ball milling time is 5-100 h.
4. The method for preparing the ultra-smooth graphene molar structure coating according to claim 1, wherein the method comprises the following steps: and a solvent is also added in the ball milling process.
5. The method for preparing the ultra-smooth graphene molar structure coating according to claim 4, wherein the method comprises the following steps: the solvent includes but is not limited to one of ethanol, water, N-dimethylformamide.
6. The method for preparing the ultra-smooth graphene molar structure coating according to claim 1, wherein the method comprises the following steps: the grinding bead is one of a steel ball, an alumina ball, a zirconia ball, a silicon nitride ball and a silicon carbide ball with the surface roughness of Ra 3-5 mu m and the ball diameter of 1-20 mm.
7. The method for preparing the ultra-smooth graphene molar structure coating according to claim 1, wherein the method comprises the following steps: the different environment atmospheres comprise nitrogen, argon, vacuum and different humidity environments.
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