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Self-lubricating material and preparation method thereof

A technology of self-lubricating materials and sliding layers, which is applied in the field of materials, can solve the problems of increasing process complexity and production costs, and does not show the effective influence of the bonding strength of the sliding layer and the supporting layer, so as to achieve excellent peel strength and reduce material failure. Possibility, effect of simple preparation method

Inactive Publication Date: 2019-05-14
COB PRECISION PARTS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The invention patent application with the application number 201210001210.3 discloses "a method for modifying the aramid fiber / PTFE liner of self-lubricating joint bearings", which uses a corrosive rare earth solution to treat the PTFE / aramid fiber sliding layer, but it can only be obtained 1.52N / mm peel strength
However, in the "three-layer self-lubricating wear-resistant sliding bearing material and its preparation method" disclosed in the invention patent application with the application number 201010115451.1, although porous sintered copper powder is used as the intermediate layer and plasma, strong acid and strong alkali, Anodizing is used to treat the fabric sliding layer, but it increases the process complexity and production cost, and it does not show that the above technical measures have an effective influence on the bonding strength between the sliding layer and the support layer

Method used

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  • Self-lubricating material and preparation method thereof

Examples

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Comparison scheme
Effect test

Embodiment 1

[0018] Such as figure 1 As shown, the self-lubricating material of the present invention is composed of a sliding layer 1, an adhesive layer 2 and a supporting layer 3, the adhesive layer 2 is arranged between the sliding layer 1 and the supporting layer 3, and the sliding layer 1 and the supporting layer 3 Bonding is connected, and its preparation method comprises the steps:

[0019] 1. Select the twill fabric with a thickness of 0.25mm, PTFE fiber and aramid fiber mixed (PTFE fiber mass content is 40%) as the sliding layer 1, wherein the breaking strength of the PTFE fiber is 0.7cN / dtex, and the breaking strength of the aramid fiber is 15cN / dtex.

[0020] 2. A cold-rolled carbon steel plate with a thickness of 1.25mm is selected as the support layer 3, and its bonding surface 3b is roughened, and the roughness Ra=3.0 μm. Immerse the adhesive surface 1a of the fabric sliding layer 1 and the adhesive surface 3b of the steel plate support layer with an ethanol solution of γ-(...

Embodiment 2

[0024] Except that the mass content of PTFE fibers in the sliding layer is 80%, the rest are the same as in Example 1. The resulting peel strength was 1.7 N / mm.

Embodiment 3

[0026] The self-lubricating material of the present invention is prepared by the following method:

[0027] 1. Select a plain weave fabric with a thickness of 0.2mm, PTFE fiber and high-strength polyester mixed (mass ratio 1:1) as the sliding layer, in which the breaking strength of PTFE fiber is 0.7cN / dtex, and the breaking strength of high-strength polyester is 4.1cN / dtex dtex.

[0028] 2. A stainless steel plate with a thickness of 2.0 mm is selected as the support layer, and its bonding surface 3 b is sandblasted with a roughness Ra=2.5 μm. The adhesive surface 1a of the fabric sliding layer and the adhesive surface 3b of the steel plate support layer were sprayed with an ethanol solution of 3-mercaptopropyltrimethoxysilane with a mass content of 10%, and then placed in an oven at 100°C to dry completely.

[0029]3. Select maleic anhydride grafted polypropylene as the binder, and add graphite powder with a mass content of 5% and γ-(2,3-glycidoxy)propyltrimethoxysilane wit...

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Abstract

The invention discloses a self-lubricating material and a preparation method thereof. The self-lubricating material is formed by compounding a sliding layer, a bonding layer and a supporting layer, wherein the sliding layer is a porous material containing PTFE fibers; the bonding surface of the supporting layer is first roughened; the bonding surfaces of the sliding layer and the supporting layerare treated with a coupling agent; and the bonding layer contains a coupling agent. The bonding layer is arranged between the sliding layer and the supporting layer, and the bonding layer bonds and compounds the sliding layer with the supporting layer together. The preparation method provided by the invention is simple and environmentally-friendly, and the prepared self-lubricating material has strong bonding between the sliding layer and the supporting layer, has excellent peeling strength, can better ensure the integrity of the self-lubricating material during use, reduces the possibility ofmaterial failure due to delamination of the sliding layer from the supporting layer, and is especially suitable for bearings, washers, sliding blocks and other components used under high load conditions.

Description

technical field [0001] The invention belongs to the field of materials, in particular to a self-lubricating material and a preparation method thereof. Background technique [0002] Polytetrafluoroethylene (PTFE) has an extremely low coefficient of friction and is widely used in the sliding layer material of self-lubricating bearings. However, PTFE has poor wear resistance and load carrying capacity. In order to improve the wear resistance and load-bearing capacity of PTFE to adapt to high-demand working conditions, PTFE fibers can be mixed with other fibers, especially high-strength, high-modulus aramid fibers, carbon fibers, polyester fibers, etc. Blended fabric is used as a sliding layer, which can take advantage of the excellent lubricity of PTFE and the high strength and wear resistance of other fibers. However, PTFE is a non-polar material with extremely low surface energy, making it difficult to bond to common support materials such as metal surfaces. During the use...

Claims

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Application Information

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IPC IPC(8): B32B15/082B32B15/14B32B27/02B32B27/30B32B7/12C09J163/00C09J151/06C09J11/04
Inventor 张国强龚颖
Owner COB PRECISION PARTS
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