CN113897130B - Silicon carbide graphene nylon composite coating for elevator guide shoe liner and preparation method thereof - Google Patents
Silicon carbide graphene nylon composite coating for elevator guide shoe liner and preparation method thereof Download PDFInfo
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- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D177/00—Coating compositions based on polyamides obtained by reactions forming a carboxylic amide link in the main chain; Coating compositions based on derivatives of such polymers
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- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
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- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
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- C23C4/00—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge
- C23C4/12—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge characterised by the method of spraying
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Abstract
The invention discloses a silicon carbide graphene nylon composite coating for an elevator guide shoe liner and a preparation method thereof. The raw materials of the silicon carbide graphene nylon composite coating for the elevator guide shoe liner comprise 5-15% by mass of silicon carbide, 5-15% by mass of modified graphene and 70-90% by mass of polyhexamethylene adipamide. The composite coating has excellent wear resistance and self-lubricating property, can effectively realize the protection of the elevator shoe liner, and prolongs the service life of the elevator shoe liner.
Description
Technical Field
The invention belongs to the technical field of material forming, and particularly relates to a silicon carbide graphene nylon composite coating for an elevator guide shoe liner and a preparation method thereof.
Background
When the elevator runs, if the installation of the car top rope end combiner is in an ideal state, the weight of the elevator system is borne by the rope end combiner, and no external load is applied to the guide shoe. In practice, however, the load is generally deviated from the center line of the car, and the guide shoes are stressed, so that the car guide shoes are under the action of the unbalanced gravity during operation, and the friction between the guide shoes of the guide rails is increased.
At present, for the problem that the elevator shoe linings are easy to wear, the method which is usually adopted is to replace the shoe linings for multiple times or select shoe lining materials with higher friction coefficients, which is not economical, time-consuming and labor-consuming, and the shoe lining materials with higher friction coefficients can increase the friction force in the elevator running process, which leads to increase of running energy consumption, and for this, the friction force is usually explained by adding lubricating oil or reducing the roughness of the surfaces of guide rails and guide shoes, however, new challenges are provided for material performance, processing precision and cost.
The key to improving the service life of the shoe lining is to provide a shoe lining material which can effectively reduce friction and has application value.
Disclosure of Invention
The invention aims to solve the technical problem of providing a silicon carbide graphene nylon composite coating for an elevator guide shoe liner and a preparation method thereof aiming at the defects of the prior art, wherein the composite coating comprises silicon carbide, modified graphene and polyhexamethylene adipamide, has excellent wear resistance and self-lubricating characteristics, can effectively realize the protection of the elevator guide shoe liner, and prolongs the service life of the elevator guide shoe liner.
In order to solve the technical problems, the invention adopts the technical scheme that: the silicon carbide graphene nylon composite coating for the elevator guide shoe liner is characterized in that raw materials of the composite coating comprise 5-15% by mass of silicon carbide, 5-15% by mass of modified graphene and 70-90% by mass of polyhexamethylene adipamide.
The silicon carbide graphene nylon composite coating for the elevator guide shoe liner is characterized in that the modified graphene is nano silicon carbide modified graphene.
The silicon carbide graphene nylon composite coating for the elevator guide shoe liner is characterized in that the preparation method of the nano silicon carbide modified graphene comprises the following steps:
step one, adding raw material graphene powder into absolute ethyl alcohol, and stirring until the raw material graphene powder is uniformly mixed to obtain a graphene mixed system A;
step two, adding deionized water into the graphene mixed system A obtained in the step one, and performing ultrasonic dispersion for 8-12 hours to obtain a graphene mixed system B;
and step three, adding tetraethoxysilane into the graphene mixed system B obtained in the step two, stirring for 2-6 hours, carrying out suction filtration, drying, and carrying out vacuum sintering to obtain the nano silicon carbide modified graphene.
The silicon carbide graphene nylon composite coating for the elevator guide shoe liner is characterized in that the specific surface area of the raw material graphene powder in the step one is 180m 2 /g～280m 2 G, the average grain diameter is more than 5 mu m and less than 10 mu m, and the carbon content is 70-80 percent; firstly, the mass of the absolute ethyl alcohol is 400-600 times of that of the raw material graphene powder; secondly, the frequency of the ultrasonic dispersion is 20 Hz-40 Hz, and the power is 1000W-1200W; the mass of the deionized water is 400-600 times of that of the raw material graphene powder; thirdly, the mass of the ethyl orthosilicate is 1/600 to 1/500 times that of the graphene mixed system B; the drying temperature is 100-140 ℃ and the drying time is 4-8 h; and step three, the temperature of vacuum sintering is 1400-1600 ℃, the heating rate is 10-14 ℃/min, the heat preservation time is 8-12 h, and the vacuum degree is 400-600 Pa.
The silicon carbide graphene nylon composite coating for the elevator guide shoe liner is characterized in that the silicon carbide is prepared by taking tetraethoxysilane powder as a silicon source and taking graphene powder as a carbon source, and the preparation method specifically comprises the following steps:
step one, placing mixed powder of tetraethoxysilane powder and graphene powder in an anhydrous ethanol medium for ball milling for 10-14 h to obtain a ball-milled system;
step two, drying the ball-milled system in the step one for 2-6 h at the temperature of 100-140 ℃ to obtain dried powder;
and step three, sintering the dried powder in the step two for 4 to 8 hours at 1400 to 1600 ℃ under a vacuum condition to complete the preparation of the silicon carbide.
The silicon carbide graphene nylon composite coating for the elevator guide shoe liner is characterized in that a grinding ball used in ball milling in the first step is a silicon carbide grinding ball; step one of the positive siliconIn the mixed powder of ethyl silicate powder and graphene powder, the mass percentage content of the ethyl orthosilicate powder is 75-85%, the mass percentage content of the graphene powder is 15-25%, and the average particle size D of the ethyl orthosilicate powder is z Satisfies the following conditions: d is more than 5 mu m z Less than 10 mu m, and the specific surface area of the graphene powder is 180m 2 /g～280m 2 G, the average grain diameter is more than 5 mu m and less than 10 mu m, and the carbon content is 70-80 percent; the temperature rise rate of the third sintering step is 10-14 ℃/min, and the vacuum degree is 100-300 Pa.
The silicon carbide graphene nylon composite coating for the elevator guide shoe liner is characterized in that the thickness of the composite coating is 200-400 microns.
In addition, the invention also provides a method for preparing the silicon carbide graphene nylon composite coating for the guide shoe liner of the elevator, which is characterized by comprising the following steps of:
placing mixed powder of silicon carbide, modified graphene and polyhexamethylene adipamide in absolute ethyl alcohol, and stirring until the mixed powder is uniformly mixed to obtain a composite powder system A;
step two, adding deionized water into the composite powder system A obtained in the step one, and carrying out ultrasonic treatment for 6-10 h to obtain a composite powder system B;
step three, stirring the composite powder system B in the step two for 2 to 6 hours at the temperature of between 60 and 100 ℃, drying the mixture to constant weight, and screening the mixture to obtain mixed powder;
step four, drying the mixed powder obtained in the step three for 40-80 min at the temperature of 80-120 ℃ to obtain dried mixed powder;
and step five, spraying the dried mixed powder to the surface of the shoe liner to be coated by utilizing a flame spraying process.
The method is characterized in that the mass of the absolute ethyl alcohol in the step one is 400-600 times of that of the mixed powder of the silicon carbide, the modified graphene and the polyhexamethylene adipamide; the frequency of the ultrasonic treatment in the second step is 20 Hz-40 Hz, and the power is 1000W-1200W; and the mass of the deionized water in the step two is 400-600 times of the mass of the mixed powder of the silicon carbide, the modified graphene and the polyhexamethylene adipamide.
The method is characterized in that in the flame spraying in the fifth step, the flow rate of compressed air is 200-400L/min, the flow rate of gas propane is 20-60L/min, the powder feeding gas is nitrogen, the flow rate of nitrogen is 60-100L/min, the moving speed of a spray gun is 40-80 mm/s, and the spraying distance is 400-600 mm.
Compared with the prior art, the invention has the following advantages:
1. the composite coating raw materials for the elevator guide shoe liner comprise silicon carbide, modified graphene and polyhexamethylene adipamide, have excellent wear resistance and self-lubricating characteristics, can effectively realize the protection of the elevator guide shoe liner, and prolong the service life of the elevator guide shoe liner.
2. The composite coating for the elevator guide shoe liner comprises silicon carbide with extremely high hardness and wear resistance, and the silicon carbide is doped into the composite coating in a form of directly mixing the silicon carbide and nano silicon carbide particles attached to the surface of graphene, so that the composite coating has a more effective mechanical protection effect.
3. The composite coating for the guide shoe and the shoe lining of the elevator comprises polyhexamethylene adipamide, has high bonding strength with the surface of the shoe lining, avoids the problem of poor coating adhesion caused by a rough bottom layer of the shoe lining, can effectively absorb impact stress, avoids coating cracking and effectively protects the guide shoe and the guide rail.
4. Preferably, the silicon carbide is prepared by taking tetraethoxysilane powder as a silicon source and graphene powder as a carbon source through a carbothermic reduction reaction, and has the characteristics of large contact area of reactants, high uniform distribution degree of carbon source particles on the surface of silicon dioxide, uniform appearance and size of crystal grains, difficulty in agglomeration, no need of secondary crushing and high purity.
5. Preferably, the modified graphene is obtained by modifying graphene by using ethyl orthosilicate as a silicon precursor, the problems of easy agglomeration, loss, uneven mixing and the like in the mixing process due to too large difference of the amounts of the graphene and silicon carbide can be effectively solved, the weight of the graphene is improved through modification, the content, compatibility and even distribution of the components of the modified graphene in a coating can be ensured, and the physicochemical properties of the graphene and the silicon carbide can be fully utilized.
6. The invention provides a method for preparing the composite coating, which comprises the steps of mixing, drying and coating silicon carbide, modified graphene and polyhexamethylene adipamide on the surface of a shoe liner by flame spraying, can effectively utilize the characteristics of extremely small interlayer shearing force of graphene sheets and relative sliding between the graphene sheets in the friction process, endows the composite coating with self-lubricating performance, can replace the relative sliding of a metal piece on the surface of a friction pair, realizes the separation of abrasive dust and the surface of the friction pair, reduces the friction coefficient and reduces the abrasion.
7. The preparation method comprises the step of spraying the mixed powder onto the surface of the shoe lining through a flame spraying process, so that the plasticizing performance and the bonding performance can be effectively improved, and the crystallinity and the tensile property of the coating are improved.
8. The method has the advantages of wide raw material source, low cost and wide application prospect.
The technical solution of the present invention is further described in detail with reference to the accompanying drawings and embodiments.
Drawings
FIG. 1 is a metallographic photograph of the surface of the coating layer of example 3-1.
Detailed Description
Examples 1 to 1
The implementation provides a method for modifying graphene with nano silicon carbide, which comprises the following steps:
step one, adding raw material graphene powder into absolute ethyl alcohol, and stirring until the raw material graphene powder and the absolute ethyl alcohol are uniformly mixed to obtain a graphene mixed system A; the specific surface area of the raw material graphene powder is 180m 2 /g～280m 2 Per gram, the average grain diameter is less than 10 mu m and is more than 5 mu m, and the carbon content is 70 to 80 percent; the mass of the absolute ethyl alcohol is 400 times of that of the raw material graphene powder;
step two, adding deionized water into the graphene mixed system A obtained in the step one, and performing ultrasonic dispersion for 8 hours to obtain a graphene mixed system B; the frequency of the ultrasonic dispersion is 20Hz, and the power is 1000W; the mass of the deionized water is 400 times of that of the raw material graphene powder;
step three, adding tetraethoxysilane into the graphene mixed system B obtained in the step two, stirring for 2 hours, performing suction filtration, drying and vacuum sintering to obtain nano silicon carbide modified graphene; the mass of the ethyl orthosilicate is 1/500 of that of the graphene mixed system B; the drying temperature is 100 ℃, and the drying time is 4h; the temperature of the vacuum sintering is 1400 ℃, the heating rate is 10 ℃/min, the heat preservation time is 8h, and the vacuum degree is 400Pa.
Examples 1 to 2
The implementation provides a method for modifying graphene with nano silicon carbide, which comprises the following steps:
step one, adding raw material graphene powder into absolute ethyl alcohol, and stirring until the raw material graphene powder and the absolute ethyl alcohol are uniformly mixed to obtain a graphene mixed system A; the specific surface area of the raw material graphene powder is 180m 2 /g～280m 2 Per gram, the average grain diameter is less than 10 mu m and is more than 5 mu m, and the carbon content is 70 to 80 percent; the mass of the absolute ethyl alcohol is 500 times of that of the raw material graphene powder;
step two, adding deionized water into the graphene mixed system A obtained in the step one, and performing ultrasonic dispersion for 10 hours to obtain a graphene mixed system B; the frequency of the ultrasonic dispersion is 30Hz, and the power is 1100W; the mass of the deionized water is 500 times of that of the raw material graphene powder;
step three, adding tetraethoxysilane into the graphene mixed system B obtained in the step two, stirring for 4 hours, carrying out suction filtration, drying, and carrying out vacuum sintering to obtain nano silicon carbide modified graphene; the mass of the ethyl orthosilicate is 1/550 of that of the graphene mixed system B; the drying temperature is 120 ℃, and the drying time is 6 hours; the temperature of the vacuum sintering is 1500 ℃, the heating rate is 12 ℃/min, the heat preservation time is 10h, and the vacuum degree is 500Pa.
Examples 1 to 3
The implementation provides a method for modifying graphene with nano silicon carbide, which comprises the following steps:
step one, adding raw material graphene powder into absolute ethyl alcohol, and stirring until the raw material graphene powder and the absolute ethyl alcohol are uniformly mixed to obtain a graphene mixed system A; the raw material graphene powderHas a specific surface area of 180m 2 /g～280m 2 Per gram, the average grain diameter is less than 10 mu m and is more than 5 mu m, and the carbon content is 70 to 80 percent; the mass of the absolute ethyl alcohol is 600 times of that of the raw material graphene powder;
step two, adding deionized water into the graphene mixed system A obtained in the step one, and performing ultrasonic dispersion for 12 hours to obtain a graphene mixed system B; the frequency of the ultrasonic dispersion is 40Hz, and the power is 1200W; the mass of the deionized water is 600 times of that of the raw material graphene powder;
step three, adding tetraethoxysilane into the graphene mixed system B obtained in the step two, stirring for 6 hours, performing suction filtration, drying and vacuum sintering to obtain nano silicon carbide modified graphene; the mass of the ethyl orthosilicate is 1/600 of that of the graphene mixed system B; the drying temperature is 140 ℃, and the drying time is 8 hours; the temperature of the vacuum sintering is 1600 ℃, the heating rate is 14 ℃/min, the heat preservation time is 12h, and the vacuum degree is 600Pa.
Example 2-1
The embodiment provides a method for preparing silicon carbide by using tetraethoxysilane powder as a silicon source and graphene powder as a carbon source, which specifically comprises the following steps:
step one, placing mixed powder of tetraethoxysilane powder and graphene powder in an anhydrous ethanol medium for ball milling for 10 hours to obtain a ball-milled system; the grinding ball used for ball milling is a silicon carbide grinding ball; in the mixed powder of the tetraethoxysilane powder and the graphene powder, the mass percentage of the tetraethoxysilane powder is 75%, and the mass percentage of the graphene powder is 25%; the average particle diameter D of the ethyl orthosilicate powder z Satisfies the following conditions: dz is more than 5 mu m and less than 10 mu m, and the specific surface area of the graphene powder is 180m 2 /g～280m 2 Per gram, the average grain diameter is less than 10 mu m and is more than 5 mu m, and the carbon content is 70 to 80 percent;
step two, drying the ball-milled system obtained in the step one for 2 hours at the temperature of 100 ℃ to obtain dried powder;
step three, sintering the dried powder in the step two for 4 hours at 1400 ℃ under a vacuum condition to finish the preparation of the silicon carbide; the heating rate of sintering is 10 ℃/min, and the vacuum degree is 100Pa.
Examples 2 to 2
The embodiment provides a method for preparing silicon carbide by using tetraethoxysilane powder as a silicon source and graphene powder as a carbon source, which specifically comprises the following steps:
step one, placing mixed powder of tetraethoxysilane powder and graphene powder in an anhydrous ethanol medium for ball milling for 12 hours to obtain a ball-milled system; the grinding ball used for ball milling is a silicon carbide grinding ball; in the mixed powder of the tetraethoxysilane powder and the graphene powder, the mass percentage of the tetraethoxysilane powder is 80%, and the mass percentage of the graphene powder is 20%; the average particle diameter D of the ethyl orthosilicate powder z Satisfies the following conditions: dz is more than 5 mu m and less than 10 mu m, and the specific surface area of the graphene powder is 180m 2 /g～280m 2 Per gram, the average grain diameter is less than 10 mu m and is more than 5 mu m, and the carbon content is 70 to 80 percent;
step two, drying the ball-milled system obtained in the step one for 4 hours at the temperature of 120 ℃ to obtain dried powder;
step three, sintering the dried powder in the step two at 1500 ℃ for 6 hours under a vacuum condition to finish the preparation of the silicon carbide; the temperature rise rate of sintering is 12 ℃/min, and the vacuum degree is 200Pa.
Examples 2 to 3
The embodiment provides a method for preparing silicon carbide by using tetraethoxysilane powder as a silicon source and graphene powder as a carbon source, which specifically comprises the following steps:
step one, placing mixed powder of tetraethoxysilane powder and graphene powder in an anhydrous ethanol medium for ball milling for 14 hours to obtain a ball-milled system; the grinding ball used for ball milling is a silicon carbide grinding ball; in the mixed powder of the ethyl orthosilicate powder and the graphene powder, the mass percentage of the ethyl orthosilicate powder is 85%, and the mass percentage of the graphene powder is 15%; the average particle diameter D of the ethyl orthosilicate powder z Satisfies the following conditions: dz is more than 5 mu m and less than 10 mu m, and the specific surface area of the graphene powder is 180m 2 /g～280m 2 Per gram, the average grain diameter is less than 10 mu m and is more than 5 mu m, and the carbon content is 70 to 80 percent;
step two, drying the ball-milled system obtained in the step one for 6 hours at the temperature of 140 ℃ to obtain dried powder;
step three, sintering the dried powder in the step two for 8 hours at 1600 ℃ under the vacuum condition to finish the preparation of the silicon carbide; the sintering temperature rise rate is 14 ℃/min, and the vacuum degree is 300Pa.
Example 3-1
The embodiment provides a silicon carbide graphene nylon composite coating for an elevator guide shoe liner, wherein the raw materials of the composite coating comprise silicon carbide, modified graphene and polyhexamethylene adipamide, and in the raw materials of the composite coating, the mass percentage of the silicon carbide is 5%, the mass percentage of the modified graphene is 5%, and the mass percentage of the polyhexamethylene adipamide is 90%.
The modified graphene is the nano silicon carbide modified graphene described in example 1-1.
The silicon carbide was the silicon carbide of example 2-1.
The thickness of the composite coating is 200 μm.
The embodiment also provides a preparation method of the silicon carbide graphene nylon composite coating for the elevator guide shoe liner, which specifically comprises the following steps:
step one, determining the powder quality of silicon carbide, modified graphene and polyhexamethylene adipamide according to the surface area to be coated and the coating thickness, placing the mixed powder of the silicon carbide, the modified graphene and the polyhexamethylene adipamide in absolute ethyl alcohol, and stirring until the mixture is uniformly mixed to obtain a composite powder system A; the mass of the absolute ethyl alcohol is 400 times of that of the mixed powder of the silicon carbide, the modified graphene and the polyhexamethylene adipamide;
step two, adding deionized water into the composite powder system A obtained in the step one, and carrying out ultrasonic treatment for 6 hours to obtain a composite powder system B; the frequency of the ultrasonic treatment is 20Hz, and the power is 1000W; the mass of the deionized water is 400 times of that of the mixed powder of the silicon carbide, the modified graphene and the polyhexamethylene adipamide;
step three, stirring the composite powder system B in the step two for 6 hours at the temperature of 60 ℃, drying to constant weight, and screening to obtain mixed powder;
step four, drying the mixed powder obtained in the step three for 40min at the temperature of 80 ℃ to obtain dried mixed powder;
fifthly, carrying out surface rust removal, descaling and oil removal cleaning treatment on the surface of the guide shoe liner (steel 20) to obtain the surface of the shoe liner to be coated, and spraying the dried mixed powder to the surface of the shoe liner to be coated by using a flame spraying process; in the flame spraying, the flow rate of compressed air is 200L/min, the flow rate of fuel gas propane is 20L/min, the powder feeding gas is nitrogen, the flow rate of nitrogen is 60L/min, the moving speed of a spray gun is 40mm/s, and the spraying distance is 400mm.
Examples 3 to 2
The embodiment provides a silicon carbide graphene nylon composite coating for an elevator guide shoe liner, wherein the raw materials of the composite coating comprise silicon carbide, modified graphene and polyhexamethylene adipamide, and in the raw materials of the composite coating, the mass percentage of the silicon carbide is 10%, the mass percentage of the modified graphene is 10%, and the mass percentage of the polyhexamethylene adipamide is 80%.
The modified graphene is the nano silicon carbide modified graphene described in the embodiment 1-2.
The silicon carbide was the silicon carbide of example 2-2.
The thickness of the composite coating is 300 mu m.
The embodiment also provides a preparation method of the silicon carbide graphene nylon composite coating for the elevator guide shoe liner, which specifically comprises the following steps:
step one, determining the powder quality of silicon carbide, modified graphene and polyhexamethylene adipamide according to the surface area to be coated and the coating thickness, placing the mixed powder of silicon carbide, modified graphene and polyhexamethylene adipamide in absolute ethyl alcohol, and stirring until the mixed powder is uniformly mixed to obtain a composite powder system A; the mass of the absolute ethyl alcohol is 500 times of that of the mixed powder of the silicon carbide, the modified graphene and the polyhexamethylene adipamide;
step two, adding deionized water into the composite powder system A obtained in the step one, and carrying out ultrasonic treatment for 8 hours to obtain a composite powder system B; the ultrasonic treatment frequency is 30Hz, and the power is 1100W; the mass of the deionized water is 600 times of the mass of the mixed powder of the silicon carbide, the modified graphene and the polyhexamethylene adipamide;
step three, stirring the composite powder system B in the step two for 4 hours at the temperature of 80 ℃, drying to constant weight, and screening to obtain mixed powder;
step four, drying the mixed powder obtained in the step three for 60min at the temperature of 100 ℃ to obtain dried mixed powder;
fifthly, carrying out surface rust removal, descaling and oil removal cleaning treatment on the surface of the guide shoe liner (steel 20) to obtain the surface of the shoe liner to be coated, and spraying the dried mixed powder to the surface of the shoe liner to be coated by using a flame spraying process; in the flame spraying, the flow rate of compressed air is 300L/min, the flow rate of fuel gas propane is 40L/min, the powder feeding gas is nitrogen, the flow rate of nitrogen is 80L/min, the moving speed of a spray gun is 60mm/s, and the spraying distance is 500mm.
The composite coating structure in this example was substantially the same as that of example 3-1.
Examples 3 to 3
The embodiment provides a silicon carbide graphene nylon composite coating for an elevator guide shoe liner, wherein the raw materials of the composite coating comprise silicon carbide, modified graphene and polyhexamethylene adipamide, and in the raw materials of the composite coating, the mass percentage of the silicon carbide is 15%, the mass percentage of the modified graphene is 15%, and the mass percentage of the polyhexamethylene adipamide is 70%.
The modified graphene is the nano silicon carbide modified graphene described in embodiments 1 to 3.
The silicon carbide was the silicon carbide of examples 2-3.
The thickness of the composite coating is 400 μm.
The embodiment also provides a preparation method of the silicon carbide graphene nylon composite coating for the elevator guide shoe liner, which specifically comprises the following steps:
step one, determining the powder quality of silicon carbide, modified graphene and polyhexamethylene adipamide according to the surface area to be coated and the coating thickness, placing the mixed powder of the silicon carbide, the modified graphene and the polyhexamethylene adipamide in absolute ethyl alcohol, and stirring until the mixture is uniformly mixed to obtain a composite powder system A; the mass of the absolute ethyl alcohol is 600 times of that of the mixed powder of the silicon carbide, the modified graphene and the polyhexamethylene adipamide;
step two, adding deionized water into the composite powder system A obtained in the step one, and carrying out ultrasonic treatment for 10 hours to obtain a composite powder system B; the ultrasonic treatment frequency is 40Hz, and the power is 1200W; the mass of the deionized water is 500 times of that of the mixed powder of the silicon carbide, the modified graphene and the polyhexamethylene adipamide;
step three, stirring the composite powder system B in the step two for 2 hours at the temperature of 100 ℃, drying to constant weight, and screening to obtain mixed powder;
step four, drying the mixed powder obtained in the step three for 80min at the temperature of 120 ℃ to obtain dried mixed powder;
fifthly, carrying out surface rust removal, descaling and oil removal cleaning treatment on the surface of the guide shoe liner (steel 20) to obtain the surface of the shoe liner to be coated, and spraying the dried mixed powder to the surface of the shoe liner to be coated by using a flame spraying process; in the flame spraying, the flow rate of compressed air is 400L/min, the flow rate of gas propane is 60L/min, the flow rate of powder feeding gas is nitrogen, the flow rate of nitrogen is 100L/min, the moving speed of a spray gun is 80mm/s, and the spraying distance is 600mm.
The composite coating structure in this example was substantially the same as that of example 3-1.
Performance evaluation:
FIG. 1 is a metallographic photograph of the surface of the coating layer of example 3-1, from which it is apparent that good bonding of the substrate to the coating layer, uniform microstructure of the coating layer, dense structure, and no significant porosity or cracks are observed, indicating that a dense structure coating can be formed on the surface of the shoe liner using the method of the present invention.
The results of the frictional wear test of the silicon carbide graphene nylon composite coating for elevator guide shoe liners of examples 3-1 to 3-3 using a frictional wear tester are shown in table 1, in which the applied load is 200N and the rotational speed is 2500r/min.
From table 1, it can be observed that, under the same frictional wear test condition, compared with the uncoated shoe liner, the silicon carbide graphene nylon composite coating for the elevator guide shoe liner of the present invention has a significantly reduced wear loss, which indicates that the silicon carbide graphene nylon composite coating for the elevator guide shoe liner of the present invention can effectively improve the wear-resistant self-lubricating performance of the elevator guide shoe liner.
Table 1 wear resistance of the coated elevator guide shoe liner of the present invention
| Sample (I) | Abrasion 40h (mg) | Abrasion 60h (mg) | Abrasion 80h (mg) |
| 20 steel (No spray coating) | 130 | 152 | 186 |
| Example 3-1 | 68 | 75 | 90 |
| Example 3-1 | 72 | 81 | 88 |
| Examples 3 to 3 | 73 | 78 | 83 |
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and any simple modifications, changes and equivalent structural changes made to the above embodiment according to the technical spirit of the present invention still fall within the protection scope of the technical solution of the present invention.
Claims (6)
1. A method for preparing a silicon carbide graphene nylon composite coating for an elevator guide shoe liner is characterized in that,
the composite coating comprises raw materials of silicon carbide, modified graphene and polyhexamethylene adipamide, wherein in the raw materials of the composite coating, the mass percentage of the silicon carbide is 5-15%, the mass percentage of the modified graphene is 5-15%, and the mass percentage of the polyhexamethylene adipamide is 70-90%; the modified graphene is nano silicon carbide modified graphene;
the preparation method of the nano silicon carbide modified graphene comprises the following steps:
step 101, adding raw material graphene powder into absolute ethyl alcohol, and stirring until the raw material graphene powder and the absolute ethyl alcohol are uniformly mixed to obtain a graphene mixed system A;
102, adding deionized water into the graphene mixed system A obtained in the step 101, and performing ultrasonic dispersion for 8h to 12h to obtain a graphene mixed system B;
step 103, adding tetraethoxysilane into the graphene mixed system B obtained in the step 102, stirring for 2h to 6h, performing suction filtration, drying and vacuum sintering to obtain nano silicon carbide modified graphene;
the silicon carbide is prepared by taking tetraethoxysilane as a silicon source and graphene powder as a carbon source, and the preparation method specifically comprises the following steps:
step 201, placing a mixture of ethyl orthosilicate and graphene powder in an absolute ethyl alcohol medium for ball milling for 10h to 14h to obtain a ball-milled system;
step 202, baking the ball-milled system in the step 201 for 2h to 6h at the temperature of 100-140 ℃ to obtain baked powder;
step 203, sintering the dried powder obtained in the step 202 at 1400-1600 ℃ for 4-8 h under a vacuum condition to finish the preparation of the silicon carbide;
the method for preparing the silicon carbide graphene nylon composite coating for the guide shoe and shoe liner of the elevator comprises the following steps:
placing mixed powder of silicon carbide, modified graphene and polyhexamethylene adipamide in absolute ethyl alcohol, and stirring until the mixed powder is uniformly mixed to obtain a composite powder system A;
step two, adding deionized water into the composite powder system A obtained in the step one, and carrying out ultrasonic treatment for 6h to 10h to obtain a composite powder system B;
step three, stirring the composite powder system B in the step two for 2h to 6h at the temperature of 60-100 ℃, drying to constant weight, and screening to obtain mixed powder;
step four, under the temperature condition of 80-120 ℃, drying the mixed powder obtained in the step three for 40min-80min to obtain dried mixed powder;
and step five, spraying the dried mixed powder to the surface of the shoe liner to be coated by utilizing a flame spraying process.
2. The method of claim 1, wherein the raw graphene powder of step 101 has a specific surface area of 180m 2 /g~280m 2 The average grain diameter is more than 5 mu m and less than 10 mu m, and the carbon content is 70-80%; 101, the mass of the absolute ethyl alcohol is 400-600 times of that of the raw material graphene powder; 102, the frequency of ultrasonic dispersion is 20Hz to 40Hz, and the power is 1000W to 1200W; the mass of the deionized water in the step 102 is 400-600 times of that of the raw material graphene powder; 103, the mass of the ethyl orthosilicate is 1/600 to 1/500 times of the mass of the graphene mixed system B; step 103, drying at 100-140 ℃ for 4-8 h; and 103, performing vacuum sintering at 1400-1600 ℃, at a heating rate of 10-14 ℃/min, for 8-12h, and at a vacuum degree of 400-600 Pa.
3. The method of claim 1, wherein the grinding balls used in the ball milling of step 201 are silicon carbide grinding balls; the specific surface area of the graphene powder in the step 201 is 180m 2 /g~280m 2 The average grain diameter is more than 5 mu m and less than 10 mu m, and the carbon content is 70-80%; the temperature rise rate of the sintering in the step 203 is 10-14 ℃/min, and the vacuum degree is 100Pa-300Pa.
4. The method of claim 1, wherein the composite coating has a thickness of 200 μ ι η to 400 μ ι η.
5. The method according to claim 1, wherein the mass of the absolute ethyl alcohol in the first step is 400-600 times of that of the mixed powder of silicon carbide, modified graphene and polyhexamethylene adipamide; secondly, the frequency of the ultrasonic treatment is from 20Hz to 40Hz, and the power is from 1000W to 1200W; and the mass of the deionized water in the second step is 400-600 times of that of the mixed powder of the silicon carbide, the modified graphene and the polyhexamethylene adipamide.
6. The method as claimed in claim 1, wherein in the flame spraying in the fifth step, the flow rate of the compressed air is 200L/min-400L/min, the flow rate of the gas propane is 20L/min-60L/min, the powder feeding gas is nitrogen, the flow rate of the nitrogen is 60L/min-100L/min, the moving speed of the spray gun is 40 mm/s-80 mm/s, and the spraying distance is 400mm-600mm.
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