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Preparation method for high-wear resistance metal-based self-lubricating PTFE coating

A technology with high wear resistance and metal substrates, which is applied in the coating process and coating of metal materials, and can solve the problems of increased transparency, melting point and crystallinity reduction

Active Publication Date: 2014-03-12
安徽申嘉聚合物科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Cross-linked PTFE basically retains the advantages of PTFE materials, but the melting point and crystallinity are slightly reduced, and the transparency is increased

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] The preparation method of a kind of high wear resistance metal-based self-lubricating PTFE coating that this embodiment provides, selects the stainless steel plate of length 120 centimeters, width 20 centimeters, thickness 2 millimeters, adopts general process method to spread copper powder on the steel plate One side of the stainless steel plate is then sintered at high temperature, so that the surface of the stainless steel plate is coated with a layer of metallic copper with a thickness of about 30 microns. The steel plate is used as the metal substrate, which is used in all the embodiments described in the present invention. However, the scope of the invention is not affected by the type and size of the stainless steel material and the thickness of the metallic copper coating, as these factors are not critical to the invention. Spread the pure grade PTFE on the copper coating surface of the metal substrate, and roll it to form a PTFE coating with a thickness of abou...

Embodiment 2

[0020] The preparation method of a kind of high wear resistance metal-based self-lubricating PTFE coating provided by the present embodiment is basically the same as that of Example 1, and the metal plate containing the PTFE coating is used at 340 ° C under the protection of nitrogen gas with an electron energy of 500 KeV The accelerator irradiated with an absorbed dose of 300kGy, and cooled naturally after the irradiation to obtain sample 2.

[0021] The sample 2 was subjected to the abrasion resistance test on a ring-on-disc friction and wear testing machine. The inner diameter of the stainless steel ring is 26mm and the outer diameter is 30mm. The test piece and the dual ring are roughly polished with sandpaper, then scrubbed with acetone cotton ball and dried. At room temperature, the relative sliding speed of the ring is 27 meters per minute, and the load is 200 Newtons under dry sliding sliding friction and wear, and the test time is 10 minutes. The wear of sample 2 wa...

Embodiment 3

[0023] The preparation method of a kind of high wear resistance metal-based self-lubricating PTFE coating provided in this embodiment, PTFE raw material and carbon fiber powder, graphite powder are mixed evenly according to the ratio of 80:10:10, and then paved on the metal substrate The surface of the copper coating is rolled to form a PTFE coating with a thickness of about 50 microns, and then sintered at 380° C. for 20 minutes under a nitrogen atmosphere. Part of the obtained sample was used as control sample 2, and the other part was irradiated with an accelerator with an electron energy of 1.5 MeV at 350°C under the protection of nitrogen, with an absorbed dose of 50 kGy. After the irradiation, it was naturally cooled to obtain sample 3.

[0024]The obtained control sample 2 and sample 3 were subjected to a friction resistance test on a ring-on-disc friction and wear testing machine. The inner diameter of the stainless steel ring is 26mm and the outer diameter is 30mm. T...

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Abstract

The invention discloses a preparation method for a high-wear resistance metal-based self-lubricating PTFE coating. The method employs PTFE as a raw material and is characterized by comprising the following steps: coating PTFE or a mixture of PTFE and an additive on the surface of a metal substrate and carrying out drying so as to form a PTFE film; then irradiating the PTFE film at a temperature of 330 to 355 DEG C by using an electron accelcrator so as to allow PTFE to be in a fusion state, wherein an irradiation atmosphere is inert gas; and allowing PTFE molecules on the surface of the metal substrate to undergo crosslinking so as to form a tridimensional network. The cross-linked PTFE coating prepared by using the method has wear resistance improved by 5 to 100 times or even higher compared with the wear resistance of coatings obtained through conventional PTFE high temperature sintering. The method has the following advantages: pure PTFE coating with high wear resistance and lubricity is obtained without doping of any other additive into PTFE, and a coating with better wear resistance and lubricity can be obtained by doping other additives into PTFE according to different application.

Description

technical field [0001] The invention belongs to a preparation method of a high wear resistance metal base self-lubricating PTFE (polytetrafluoroethylene) coating, in particular to a preparation method of a high wear resistance metal base self lubricating PTFE coating. Background technique [0002] Polytetrafluoroethylene (PTFE) coating has a wide range of applications in the fields of electricity, chemistry, semiconductor, automobile, medical treatment, food and so on. Since the PTFE molecular chain is almost linear and has a strong intramolecular line interaction, the polarity and surface energy are very low, resulting in a relatively low bonding strength between the PTFE coating and the metal substrate. In order to overcome these defects, a primer (transition layer) is generally used or other components are added, although these measures may affect the thermal stability and purity of the PTFE coating. Metal-based oil-free lubricating bearings with PTFE polymer coating on ...

Claims

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Application Information

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IPC IPC(8): C23C26/02C23C24/10
Inventor 吴国忠钟磊胡志强
Owner 安徽申嘉聚合物科技有限公司