CN111390162B - Preparation and application method of aluminum-coated polytetrafluoroethylene powder - Google Patents

Preparation and application method of aluminum-coated polytetrafluoroethylene powder Download PDF

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CN111390162B
CN111390162B CN202010378738.7A CN202010378738A CN111390162B CN 111390162 B CN111390162 B CN 111390162B CN 202010378738 A CN202010378738 A CN 202010378738A CN 111390162 B CN111390162 B CN 111390162B
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aluminum
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polytetrafluoroethylene
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CN111390162A (en
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林惠令
林菁
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Shanghai Kailin New Technological Co ltd
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F1/00—Metallic powder; Treatment of metallic powder, e.g. to facilitate working or to improve properties
    • B22F1/17—Metallic particles coated with metal
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F9/00—Making metallic powder or suspensions thereof
    • B22F9/02—Making metallic powder or suspensions thereof using physical processes
    • B22F9/026—Spray drying of solutions or suspensions
    • C—CHEMISTRY; METALLURGY
    • 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
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C4/00—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge
    • C23C4/04—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge characterised by the coating material
    • C23C4/06—Metallic material
    • C—CHEMISTRY; METALLURGY
    • 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
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • 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
    • C23C4/134—Plasma spraying

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Abstract

The invention is suitable for the technical field of thermal spraying, and provides a preparation method and an application method of aluminum-coated polytetrafluoroethylene powder, wherein the raw materials of the aluminum-coated polytetrafluoroethylene powder mainly comprise: the aluminum powder with the outer layer of 3-5 microns, the hollow porous alumina ball coated by the aluminum powder and with the particle size of 35-40 microns and the polytetrafluoroethylene dispersion liquid in the hollow porous alumina ball are three, and the preparation method of the aluminum-coated polytetrafluoroethylene powder comprises the following steps: step one, treating the hollow porous alumina ball; the aluminum-coated polytetrafluoroethylene powder is attached to the surface of the tungsten carbide layer by a plasma spraying method, so that aluminum and the surface of the tungsten carbide layer are integrated, a shell formed by aluminum protects polytetrafluoroethylene from being burnt in the spraying process, the burning loss rate of the polytetrafluoroethylene is lower than 0.3 percent, the environmental influence can be ignored, and the indexes of hardness DPH 300650-950 and surface roughness Ra 0.8 in the technical requirements of the papermaking dryer coating can be completely met.

Description

Preparation and application method of aluminum-coated polytetrafluoroethylene powder
Technical Field
The invention belongs to the technical field of thermal spraying, and particularly relates to a preparation method and an application method of an aluminum-coated polytetrafluoroethylene powder.
Background
Thermal spraying, which is to heat and melt a coating material, atomize the coating material into superfine particles by high-speed airflow, and spray the superfine particles onto the surface of a workpiece at a high speed to form a coating; various drying cylinders, winding rollers and the like on the traditional papermaking equipment are easily corroded by chemicals, so that the surfaces of the drying cylinders are required to be thermally sprayed, and the traditional coatings are as follows: the bottoming layer, the tungsten carbide layer and the Teflon layer, wherein the highest sintering temperature of Teflon (poly) is 400 ℃, and the temperature rise is generally stopped at 350-380 ℃.
The Teflon layer is formed by spraying Teflon on the tungsten carbide layer through static electricity and then sintering at high temperature, but because the Teflon is not protected in the high-temperature sintering process, certain loss is easily generated, so that the consumption of the Teflon is increased and certain economic loss is caused, and meanwhile, gas released by sintering is not allowed by environmental protection, so that Teflon manufacturers are not allowed to exist in a near-urban area.
SUMMERY OF THE UTILITY MODEL
The invention provides a preparation method and an application method of an aluminum-coated polytetrafluoroethylene powder, and aims to solve the problems that a certain loss is easily generated due to no protection in the high-temperature sintering process of Teflon, so that the consumption of Teflon is increased and a certain economic loss is caused, and gas released by sintering is not allowed by environmental protection, so that Teflon manufacturers are not allowed in a near-urban area.
The invention is realized in such a way that the preparation of the aluminum-coated polytetrafluoroethylene powder mainly comprises the following raw materials: aluminum powder with the outer layer of 3-5 microns, hollow porous alumina balls coated by the aluminum powder and with the particle size of 35-40 microns, and polytetrafluoroethylene dispersion liquid inside the hollow porous alumina balls,
the preparation method of the aluminum-coated polytetrafluoroethylene powder comprises the following steps:
step one, processing the hollow porous alumina ball to generate a product A;
step two, processing the polytetrafluoroethylene dispersion to generate a product B;
step three, preparing powder, wherein the powder preparation is divided into three steps, the first step is to prepare powder C primarily, the product A and the product B are mixed to prepare paste, then atomization, collection and screening are carried out by atomization drying equipment to obtain powder C, and the powder C is dried; secondly, preparing an aluminum solution, namely mixing aluminum powder, polyvinyl alcohol and absolute ethyl alcohol to prepare the aluminum solution; and thirdly, preparing final powder, adding the powder C into an aluminum solution, mixing to prepare paste, then atomizing, screening and collecting by using atomizing and drying equipment to obtain powder D, drying the powder D, then adding the powder D into the aluminum solution, mixing to prepare paste, and then atomizing, screening and collecting by using atomizing and drying equipment to obtain the powder.
Preferably, the hollow porous alumina spheres: particle size: 30-35 μm, bulk density: 1.8-2.4 g/cm3And wall thickness: 5-7 μm, pore size: 1-3 μm, porosity: 50-75%, melting point: 1600 ℃; the polytetrafluoroethylene dispersion liquid: solid content: 60%, melting point: 327 ℃ and particle size: 0.18-0.25 mu m,Dispersing agent: 4-8%, viscosity: 15*10-3~30*10-3Pa.s, pH: 10. density: 1.5-2.3 g/cm 3; the aluminum powder: particle size: 1-3 μm, bulk density: 3.9 g/cm 3, melting point: 2030 ℃; the polytetrafluoroethylene dispersion liquid comprises the following components: 60 percent of polytetrafluoroethylene, 32 to 36 percent of water and 4 to 8 percent of dispersant, and only 60 percent of polytetrafluoroethylene dispersion is left after high-temperature drying in the hollow porous alumina ball.
Preferably, the first step: reacting boric acid with KH-550 (gamma-aminopropylethoxysilane) according to a ratio of 1: 10 in a certain amount of absolute ethyl alcohol to prepare a solution, then placing the hollow porous alumina ball in the prepared solution to stir and infiltrate, cooling the hollow porous alumina ball completely infiltrated at the room temperature after 50-120 minutes of water bath at the temperature of 80-90 ℃, filtering, washing by deionized water, and drying at the temperature of 100-120 ℃ for 90-180 minutes to form a product A.
Preferably, the second step: adjusting the viscosity of the polytetrafluoroethylene dispersion to 5 x 10 by deionized water-3~10*10-3Pa.s, and adjusted to PH 8 by 1-2% acetic acid, followed by dilution with diluent: diluting with 1-2% N-2-methyl pyrrolidone to obtain a product B.
Preferably, the third step: the atomization drying equipment comprises a drying tower and a centrifugal atomizer positioned above the drying tower; the centrifugal atomizer is provided with 1 feeding hole, and an atomizing nozzle of the centrifugal atomizer extends into the drying tower.
Preferably, the atomization temperature in the first step in the third step is 50-80 ℃, and the atomization temperature in the third step is 120-150 ℃.
Preferably, the mass ratio of the aluminum powder to the polytetrafluoroethylene dispersion is 3: 7. 4: 6. 5: 5, and the mass ratio of the hollow porous alumina ball to the polytetrafluoroethylene dispersion liquid is 15-25%.
The invention is realized in this way, an application method of aluminum-coated polytetrafluoroethylene powder comprises the following steps of S1: manufacturing a priming layer; step S2: manufacturing a tungsten carbide layer; step S3: and manufacturing an aluminum-coated polytetrafluoroethylene powder layer.
Preferably, NiCr is used as a primer layer in step S1, tungsten carbide with a macro hardness of RC32-40 is used as a tungsten carbide layer in step S2, and the prepared aluminum-coated polytetrafluoroethylene powder with a particle size of 35-40 μm is used as an original teflon layer in step S3.
Preferably, the tungsten carbide is mechanically roughened in the step S2, and the tungsten carbide layer is sprayed by a spray gun in the step S3.
Compared with the prior art, the invention has the beneficial effects that: the invention relates to a preparation method and an application method of an aluminum-coated polytetrafluoroethylene powder, wherein the aluminum-coated polytetrafluoroethylene powder is attached to the surface of a tungsten carbide layer by a plasma spraying method, so that aluminum and the surface of tungsten carbide are integrated, a shell formed by aluminum protects polytetrafluoroethylene from being burnt during the spraying process, the burning loss rate of polytetrafluoroethylene is lower than 0.3%, gas released by the product is very limited, the influence on the environment can be ignored, and indexes of hardness DPH 300650-950 and surface roughness Ra 0.8 in the technical requirements of a drying cylinder coating for papermaking can be completely met.
Drawings
FIG. 1 is a schematic structural view of an aluminum-coated polytetrafluoroethylene powder product of the present invention;
FIG. 2 is a schematic view of the process for preparing the aluminum-coated PTFE powder of the present invention;
FIG. 3 is a schematic view of the process of applying the aluminum-coated PTFE powder of the present invention;
FIG. 4 is a comparative illustration of an embodiment of the present invention;
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Referring to fig. 1 and fig. 2, the present invention provides a technical solution: the preparation method of the aluminum-coated polytetrafluoroethylene powder mainly comprises the following steps: the aluminum powder with the outer layer of 3-5 microns, the hollow porous alumina ball coated by the aluminum powder and with the grain diameter of 35-40 microns and the polytetrafluoroethylene dispersion liquid in the hollow porous alumina ball are three, and the preparation method of the aluminum-coated polytetrafluoroethylene powder comprises the following steps: step one, processing a hollow porous alumina ball to generate a product A; step two, treating the polytetrafluoroethylene dispersion to generate a product B; and step three, preparing powder, wherein the powder preparation is divided into three steps, the first step is to prepare powder C primarily, the product A and the product B are mixed to prepare paste, then the paste is atomized, collected and screened by an atomization drying device to obtain the powder C, the powder C is dried, the second step is to prepare an aluminum solution, the aluminum powder, polyvinyl alcohol and absolute ethyl alcohol are mixed to prepare the aluminum solution, the third step is to prepare the final powder, the powder C is added into the aluminum solution to prepare the paste, then the paste is atomized, screened and collected by the atomization drying device to obtain powder D, the powder D is dried, then the powder D is added into the aluminum solution to prepare the paste, and then the paste is atomized, screened and collected by the atomization drying device to obtain the powder.
In this embodiment, boric acid is first reacted with KH-550 (gamma-aminopropylethoxysilane) in a ratio of 1: 10 in a certain amount of absolute ethyl alcohol to prepare a solution, then placing the hollow porous alumina balls in the prepared solution to stir and infiltrate, cooling and filtering the hollow porous alumina balls which are completely infiltrated at the temperature of 80-90 ℃ in water bath for 50-120 minutes, then placing the hollow porous alumina balls at the room temperature for washing by deionized water, and drying at the temperature of 100-120 ℃ for 90-180 minutes to form a product A; the viscosity of the polytetrafluoroethylene dispersion was then adjusted to 5 x 10 by deionized water-3~10*10-3Adjusting the pH value to 8 through 1-2% acetic acid within Pa.s, adding 1-2% N-2-methyl pyrrolidone diluent to dilute to obtain a product B, mixing the product A and the product B to prepare a paste, pumping the mixture into a centrifugal atomizer through a pump, wherein the centrifugal speed of the atomizer is 5000-15000 rpm; spraying atomized liquid drops into a drying tower from an atomizing nozzle, wherein the height of the drying tower is 2-5 m, the temperature of hot air atmosphere in the drying tower is 50-250 ℃, the dried atomized substance falls freely in the hot air, the powder C is obtained by screening and collecting the powder at the bottom of the tower, and then the powder C is added into an aluminum solution prepared by mixing aluminum powder, polyvinyl alcohol and absolute ethyl alcohol and is mixed to prepare the aluminum-based composite materialAnd (3) pasty, pumping the mixture into a centrifugal atomizer from a feed inlet through a pump, atomizing, screening and collecting to obtain powder D, adding the powder D into another prepared aluminum solution, mixing to obtain pasty again, pumping into an atomizing and drying device, atomizing, screening and collecting to obtain the aluminum-coated polytetrafluoroethylene powder with the final particle size of 35-40 mu m, and using the aluminum-coated polytetrafluoroethylene powder as the original Teflon layer.
As shown in fig. 4, the present embodiment 1: first, boric acid is mixed with KH-550 (gamma-aminopropylethoxysilane) according to the ratio of 1: 10 in a certain amount of absolute ethyl alcohol to prepare a solution, then placing the hollow porous alumina balls in the prepared solution to stir and infiltrate, cooling and filtering the hollow porous alumina balls which are completely infiltrated at the temperature of 80-90 ℃ in water bath for 50-120 minutes, then placing the hollow porous alumina balls at the room temperature for washing by deionized water, and drying at the temperature of 100-120 ℃ for 90-180 minutes to form a product A; the viscosity of the polytetrafluoroethylene dispersion was then adjusted to 10 x 10 by deionized water-3Adjusting the pH value from 10 to 8 through 0.03% acetic acid within Pa.s, diluting without adding N-2-methylpyrrolidone diluent to obtain a product B, mixing the product A and the product B to prepare paste, pumping the mixture into a centrifugal atomizer through a pump from a feed inlet, wherein the centrifugal speed of the atomizer is 5000-15000 rpm; spraying the atomized liquid drops into a drying tower through an atomizing nozzle, wherein the temperature of hot air atmosphere in the tower is 50-250 ℃, the dried atomized substance falls freely in the hot air, and the powder is collected by 500 meshes at the bottom of the tower, the powder C is 0.155 and is composed of hollow porous alumina balls and polytetrafluoroethylene dispersion, then 0.1 is selected and added into aluminum solution prepared by mixing 0.15 aluminum powder, 0.01 polyvinyl alcohol and 0.75 absolute ethyl alcohol to be mixed into paste, then the mixture is pumped into a centrifugal atomizer from a feed inlet through a pump, atomizing, sieving with 400 mesh sieve, collecting to obtain powder D, adding the powder D into another prepared aluminum solution, mixing, making into paste, then pumping the mixture into an atomization drying device for atomization, 400-mesh screening and collection to obtain the aluminum-coated polytetrafluoroethylene powder with the final particle size of 35-40 mu m for use as the original Teflon layer.
Example 2: headFirstly, mixing boric acid and KH-550 (gamma-aminopropyl ethoxysilane) according to the proportion of 1: 10 in a certain amount of absolute ethyl alcohol to prepare a solution, then placing the hollow porous alumina balls in the prepared solution to stir and infiltrate, cooling and filtering the hollow porous alumina balls which are completely infiltrated at the temperature of 80-90 ℃ in water bath for 50-120 minutes, then placing the hollow porous alumina balls at the room temperature for washing by deionized water, and drying at the temperature of 100-120 ℃ for 90-180 minutes to form a product A; the viscosity of the polytetrafluoroethylene dispersion was then adjusted to 10 x 10 by deionized water-3Adjusting the pH value from 8 to 8 through 0.03% acetic acid within Pa.s, adding 0.01N-2-methyl pyrrolidone diluent to dilute to obtain a product B, mixing the product A and the product B to prepare paste, pumping the mixture into a centrifugal atomizer through a pump, wherein the centrifugal speed of the atomizer is 5000-15000 rpm; spraying the atomized liquid drops into a drying tower through an atomizing nozzle, wherein the temperature of hot air atmosphere in the tower is 50-250 ℃, the dried atomized substance falls freely in the hot air, and the powder is collected by 500 meshes at the bottom of the tower, the powder C is 0.155 and is composed of hollow porous alumina balls and polytetrafluoroethylene dispersion, then 0.1 is selected and added into aluminum solution prepared by mixing 0.15 aluminum powder, 0.01 polyvinyl alcohol and 0.75 absolute ethyl alcohol to be mixed into paste, then the mixture is pumped into a centrifugal atomizer from a feed inlet through a pump, atomizing, sieving with 400 mesh sieve, collecting to obtain powder D, adding the powder D into another prepared aluminum solution, mixing, making into paste, then pumping the mixture into an atomization drying device for atomization, 400-mesh screening and collection to obtain the aluminum-coated polytetrafluoroethylene powder with the final particle size of 35-40 mu m for use as the original Teflon layer.
Example 3: first, boric acid is mixed with KH-550 (gamma-aminopropylethoxysilane) according to the ratio of 1: 10 in a certain amount of absolute ethyl alcohol to prepare a solution, then placing the hollow porous alumina balls in the prepared solution to stir and infiltrate, cooling and filtering the hollow porous alumina balls which are completely infiltrated at the temperature of 80-90 ℃ in water bath for 50-120 minutes, then placing the hollow porous alumina balls at the room temperature for washing by deionized water, and drying at the temperature of 100-120 ℃ for 90-180 minutes to form a product A; the viscosity of the polytetrafluoroethylene dispersion is subsequently adjusted to10*10-3Adjusting the pH value from 6 to 8 by 0.03% acetic acid within Pa.s, adding 0.015N-2-methyl pyrrolidone diluent to dilute to obtain a product B, mixing the product A and the product B to prepare paste, pumping the mixture into a centrifugal atomizer from a feed inlet by a pump, wherein the centrifugal speed of the atomizer is 5000-15000 rpm; spraying the atomized liquid drops into a drying tower through an atomizing nozzle, wherein the temperature of hot air atmosphere in the tower is 50-250 ℃, the dried atomized substance falls freely in the hot air, and the powder is collected by 500 meshes at the bottom of the tower, the powder C is 0.155 and is composed of hollow porous alumina balls and polytetrafluoroethylene dispersion, then 0.1 is selected and added into aluminum solution prepared by mixing 0.15 aluminum powder, 0.01 polyvinyl alcohol and 0.75 absolute ethyl alcohol to be mixed into paste, then the mixture is pumped into a centrifugal atomizer from a feed inlet through a pump, atomizing, sieving with 400 mesh sieve, collecting to obtain powder D, adding the powder D into another prepared aluminum solution, mixing, making into paste, then pumping the mixture into an atomization drying device for atomization, 400-mesh screening and collection to obtain the aluminum-coated polytetrafluoroethylene powder with the final particle size of 35-40 mu m for use as the original Teflon layer.
As shown in fig. 3, the present invention provides a technical solution: an application method of aluminum-coated polytetrafluoroethylene powder comprises the following steps of S1: manufacturing a priming layer; step S2: manufacturing a tungsten carbide layer; step S3: manufacturing an aluminum-coated polytetrafluoroethylene powder layer, wherein NiCr is used as a bottom layer in the step S1, tungsten carbide with macroscopic hardness RC32-40 is used as a tungsten carbide layer in the step S2, and the prepared aluminum-coated polytetrafluoroethylene powder with the particle size of 35-40 mu m is used as an original Teflon layer in the step S3; the tungsten carbide is mechanically roughened in step S2, and sprayed on the tungsten carbide layer by a spray gun in step S3.
In the embodiment, NiCr is coated on the surface of a drying cylinder applied to the papermaking equipment as a priming layer, then a tungsten carbide layer is manufactured by tungsten carbide on the basis of taking the NiCr as the priming layer, mechanical texturing is performed in the manufacturing process, finally, a spray gun is used for enabling the prepared aluminum-coated polytetrafluoroethylene powder with the particle size of 35-40 mu m to be attached to the surface of the tungsten carbide layer as an original Teflon layer by a plasma spraying method, so that the aluminum and the tungsten carbide surface are integrated, and a shell formed by the aluminum can protect the polytetrafluoroethylene in the spraying process so as to avoid burning loss.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.

Claims (10)

1. The preparation method of the aluminum-coated polytetrafluoroethylene powder is characterized by comprising the following steps: the aluminum-coated polytetrafluoroethylene powder material mainly comprises the following raw materials: aluminum powder with the outer layer of 3-5 microns, hollow porous alumina balls coated by the aluminum powder and with the particle size of 35-40 microns, and polytetrafluoroethylene dispersion liquid inside the hollow porous alumina balls,
the preparation method of the aluminum-coated polytetrafluoroethylene powder comprises the following steps:
step one, processing the hollow porous alumina ball to generate a product A;
step two, processing the polytetrafluoroethylene dispersion to generate a product B;
step three, preparing powder, wherein the powder preparation is divided into three steps, the first step is to prepare powder C primarily, the product A and the product B are mixed to prepare paste, then atomization, collection and screening are carried out by atomization drying equipment to obtain powder C, and the powder C is dried; secondly, preparing an aluminum solution, namely mixing aluminum powder, polyvinyl alcohol and absolute ethyl alcohol to prepare the aluminum solution; and thirdly, preparing final powder, adding the powder C into an aluminum solution, mixing to prepare paste, then atomizing, screening and collecting by using atomizing and drying equipment to obtain powder D, drying the powder D, then adding the powder D into the aluminum solution, mixing to prepare paste, and then atomizing, screening and collecting by using atomizing and drying equipment to obtain the powder.
2. The preparation of the aluminum-coated polytetrafluoroethylene powder according to claim 1, wherein the aluminum-coated polytetrafluoroethylene powder is prepared by the following steps: the hollow porous alumina ball: particle size: 30-35 μm, bulk density: 1.8-2.4 g/cm3And wall thickness: 5-7 μm, pore size: 1-3 μm, porosity: 50-75%, melting point: 1600 ℃;
the polytetrafluoroethylene dispersion liquid: solid content: 60%, melting point: 327 ℃ and particle size: 0.18-0.25 μm, dispersant: 4-8%, viscosity: 15 × 10-3-30 × 10-3Pa.s, pH: 10. density: 1.5-2.3 g/cm3；
The aluminum powder: particle size: 1-3 μm, bulk density: 3.9 g/cm3Melting point: 2030 ℃;
the polytetrafluoroethylene dispersion liquid comprises the following components: 60% of polytetrafluoroethylene, 32-36% of water and 4-8% of dispersing agent, and only 60% of polytetrafluoroethylene dispersion liquid is left after drying in the hollow porous alumina ball.
3. The preparation of the aluminum-coated polytetrafluoroethylene powder according to claim 1, wherein the aluminum-coated polytetrafluoroethylene powder is prepared by the following steps: the first step is as follows: reacting boric acid with gamma-aminopropylethoxysilane according to a ratio of 1: 10 in a certain amount of absolute ethyl alcohol to prepare a solution, then placing the hollow porous alumina ball in the prepared solution to stir and infiltrate, cooling the hollow porous alumina ball completely infiltrated at the room temperature after 50-120 minutes of water bath at the temperature of 80-90 ℃, filtering, washing by deionized water, and drying at the temperature of 100-120 ℃ for 90-180 minutes to form a product A.
4. The preparation of the aluminum-coated polytetrafluoroethylene powder according to claim 1, wherein the aluminum-coated polytetrafluoroethylene powder is prepared by the following steps: the second step is as follows: adjusting the viscosity of the polytetrafluoroethylene dispersion to 5 x 10 by deionized water-3~10*10-3Pa.s, and adjusted to PH 8 by 1-2% acetic acid, followed by dilution with diluent: diluting with 1-2% N-2-methyl pyrrolidone to obtain a product B.
5. The preparation of the aluminum-coated polytetrafluoroethylene powder according to claim 1, wherein the aluminum-coated polytetrafluoroethylene powder is prepared by the following steps: the third step is that: the atomization drying equipment comprises a drying tower and a centrifugal atomizer positioned above the drying tower; the centrifugal atomizer is provided with 1 feeding hole, and an atomizing nozzle of the centrifugal atomizer extends into the drying tower.
6. The preparation of the aluminum-coated polytetrafluoroethylene powder according to claim 5, wherein the aluminum-coated polytetrafluoroethylene powder is prepared by the following steps: in the third step, the atomization temperature is 50-80 ℃, and in the third step, the atomization temperature is 120-150 ℃.
7. The preparation of the aluminum-coated polytetrafluoroethylene powder according to claim 1, wherein the aluminum-coated polytetrafluoroethylene powder is prepared by the following steps: the mass ratio of the aluminum powder to the polytetrafluoroethylene dispersion liquid is 3: 7. 4: 6. 5: 5, and the mass ratio of the hollow porous alumina ball to the polytetrafluoroethylene dispersion liquid is 15-25%.
8. A method of using the aluminum-coated polytetrafluoroethylene powder according to any one of claims 1 to 7, characterized in that: includes step S1: manufacturing a priming layer; step S2: manufacturing a tungsten carbide layer; step S3: and manufacturing an aluminum-coated polytetrafluoroethylene powder layer.
9. The method of claim 8, wherein the application of the aluminum-coated polytetrafluoroethylene powder comprises the following steps: in the step S1, NiCr is used as a priming layer, in the step S2, tungsten carbide with macroscopic hardness of RC32-40 is used as a tungsten carbide layer, and in the step S3, the prepared aluminum-coated polytetrafluoroethylene powder with the particle size of 35-40 mu m is used as an original Teflon layer.
10. The method of claim 9, wherein the application of the aluminum-coated polytetrafluoroethylene powder comprises the following steps: in the step S2, tungsten carbide is mechanically roughened, and in the step S3, the tungsten carbide layer is sprayed by a spray gun.
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