JP2000141544A - Resin coated slide material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a resin coated slide material having lubricating capacity equal to or more than conventional one considering an environmental problem by using no Pb. SOLUTION: A resin coated slide material 20 is equipped with the porous metal sintered layer 22 applied and formed on a backing metal 21 and the surface resin layer 23 applied and formed in the state infiltrated into the porous metal sintered layer 22 and the surface resin layer 23 consists of 30-60 vol.% of a aromatic polyamide fiber and the remainder of PTFE. Further, the resin coated slide material 20 is equipped with the porous metal sintered layer 22 applied and formed on a backing metal 21 and the surface resin layer 23 applied and formed in the state infiltrated into the porous metal sintered layer 22 and the surface resin layer 23 may consist of 30-60 vol.% of aromatic polyamide fiber and the remainder of PTFE and a solid lubricant and/or an abrasion- resistant agent.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a resin-coated sliding material, and more particularly to a resin-coated sliding material which does not use Pb and is environmentally friendly.

[0002]

2. Description of the Related Art Conventionally known bearings include:
Used for sliding parts and rotating parts of automobiles and home appliances,
Resin-coated sliding materials have been widely used as bushings or thrust washers.

FIG. 4 is a sectional view of a conventional resin-coated sliding member 10. Reference numeral 11 denotes a back metal such as a steel plate, 12 denotes a porous metal sintered layer, and 13 denotes a lead-containing surface resin layer.

[0004] The resin-coated sliding member 10 is a backing metal 1 such as a steel plate.
PTF formed by forming a porous metal sintered layer 12 on the base material 1 and mixing a low melting point metal such as Pb with the porous metal sintered layer 12
The surface resin layer 13 is impregnated with E (ethylene tetrafluoride resin).

[0005] The bearing formed by the resin-coated sliding material 10 is subjected to a running-in operation, and the PTF
A mixed film of E and PbO made of Pb mixed in the surface resin layer 13 is formed. Since PbO is also a lubricating component, it is possible to obtain abrasion resistance and low friction characteristics.

[0006]

However, the conventional resin-coated sliding member 10 has the following problems.

As described above, the resin-coated sliding member 10 is
It has lubrication performance with wear resistance and low friction, and has been widely used as a bush or thrust washer for bearings and the like.

However, in recent years, the use of Pb has been regulated from the environmental point of view, and there is an environmental problem that non-use of Pb which is a lubricating component is required. There is also a problem that the lubrication performance is required to be further improved depending on the use purpose.

The present invention has been made in view of the above problems, and provides a resin-coated sliding material which does not use Pb and has a lubricating performance equal to or higher than that of the related art in consideration of environmental problems. The purpose is to do.

[0010]

According to the present invention, a resin-coated sliding material according to the present invention comprises a porous metal sintered layer formed on a backing metal, and a porous metal sintered layer impregnated with the porous metal sintered layer. And a surface resin layer made of 30 to 60% by volume of aromatic polyamide fiber, and the balance being PTFE.

[0011] The present invention further includes a porous metal sintered layer adhered and formed on the back metal, and a surface resin layer adhered and formed in a state of being impregnated into the porous metal sintered layer. It is characterized in that 30 to 60% by volume of aromatic polyamide fiber and the balance are composed of PTFE, a solid lubricant and / or an antiwear agent.

The solid lubricant is MoS ₂ or graphite, and the antiwear agent is SiC, Al ₂ O ₃ ,
It is characterized in that at least one of Si ₃ N _{4 and} SiO ₂ is used.

[0013]

Embodiments of the present invention will be described below.

FIG. 1 is a sectional view of a resin-coated sliding member 20 according to a first embodiment of the present invention. 21 is a back metal such as a steel plate, 22 is a porous metal sintered layer, 23 is a surface resin layer, 24
Represents an aromatic polyamide fiber.

The porous metal sintered layer 22 is formed by spraying an alloy powder of Cu and Sn on a back metal 21 such as a steel plate and then sintering to form a porous metal sintered layer of Cu-10% Sn. It was done. The resin-coated sliding member 20 according to the present invention has a structure in which an aromatic polyamide fiber 24 and PT
The surface resin layer 23 is formed by impregnating with a mixture of FE.

When the bearing formed by the resin-coated sliding member 20 runs in and the initial running-in wear occurs, the aromatic polyamide fibers 24 are exposed on the surface of the surface resin layer 23. The aromatic polyamide fiber 24 is excellent in abrasion resistance, can support a load, and can draw out the low friction property inherent in PTFE, and the surface resin layer 23 can have a durable lubricating performance.

The method of manufacturing the resin-coated sliding material 20 according to the present invention is as follows. A porous metal sintered layer 22 is formed by dispersing Cu and Sn alloy powder on a back metal 21 of a steel plate or the like (including a copper-plated steel plate). After a solution containing an organic solvent is wetted on the surface of the fine powder of PTFE, the mixture of the fine powder and the aromatic polyamide fiber 24 is sprinkled on the porous metal sintered layer 22 and rolled. After impregnating and coating with, for example, it is fired and applied to form the surface resin layer 23.

The aromatic polyamide fibers 24 are mixed in order to bring out low abrasion. The fibers having a fiber length of 0.1 to 1 mm contain 50% or more of the fiber length and the fiber diameter of 0.01 to 1 mm.
Since 0.02 mm contains 50% or more of the fiber diameter,
The aromatic polyamide fibers 24 can be effectively aligned with the bearing surface without being perpendicular to the bearing surface.

Next, a description will be given of a friction and wear test performed on a sample of the resin-coated sliding member 20 of the present invention. The friction and wear test was performed under the test conditions of a load of 6 Mpa, a peripheral speed of 15 m / min, and a test time of 1 hour. Table 1 shows the sample N for testing.
The composition components and test results of o.1 to 6 are shown. Sample No.1 ~
No. 6 shows a case where a surface resin layer 23 is formed on a porous metal sintered layer 22 of Cu-10% Sn.
Are a predetermined volume% of PTFE and a predetermined volume%
From the composition of the aromatic polyamide fiber 24.

The test results of Sample Nos. 1 to 6 are shown on the right side of Table 1. FIG. 2 is a graph showing the relationship between the volume% of the aromatic polyamide fiber and the wear amount based on the test results.

When the content of the aromatic polyamide fibers 24 in Samples Nos. 1 and 2 is less than 15% by volume, there is almost no network-like connection between the fibers and there is no problem in lubricity, but the effect of preventing the wear of PTFE becomes insufficient. Significant improvement in wear resistance cannot be achieved.

When the aromatic polyamide fibers 24 of Sample Nos. 5 and 6 are 70% by volume or more, the exposed portion of the fibers having poor friction properties as compared with PTFE becomes excessively large, so that the friction coefficient is increased and the coagulation with the mating material is increased. It is not desirable because the amount of spallation due to wearing increases and wear increases.

Therefore, as shown in FIG.
The test result of No. 6 shows that the aromatic polyamide fibers 24
In the range of 60% by volume, it can be said that the abrasion amount is in a good range generally smaller than that of the comparative example containing no Pb. Further, in the range of 30 to 60% by volume, stable sliding without any change in the friction coefficient is performed, and no adhesion is observed on the sliding surface.

As a sliding bearing in which an aromatic polyamide fiber and PTFE are combined, JP-A-9-500195 describes 2-
Polytetrafluoroethylene containing 10% by volume of fibrillated aramid fibers is described. When the amount of the aromatic polyamide fiber exceeds 10% by volume, the aromatic polyamide fiber does not sufficiently impregnate the porous metal sintered layer 22, and after firing, the surface resin layer 23 and the porous metal sintered layer 22 are separated. A phenomenon has occurred. In order to solve this, a mixture of PTFE and an aromatic polyamide fiber was sprayed on the porous metal sintered layer 22 in the production of the above sample Nos. 1 to 6,
The peeling phenomenon could be prevented by applying a pressure such that the thickness of the porous metal sintered layer 22 and the back metal 21 becomes 10% or more before firing and 3% or more after firing.

As described above, the resin-coated sliding member 20 of the first embodiment
By effectively using aromatic polyamide fibers and not using Pb, it is possible to obtain lubrication performance equivalent to or higher than the conventional one in consideration of environmental issues.

The porous metal sintered layer 22 can be replaced by a metal-sprayed sprayed layer.

FIG. 3 is a sectional view of a resin-coated sliding member 30 according to a second embodiment of the present invention. 31 is a back metal such as a steel plate, 32 is a porous metal sintered layer, 33 is a surface resin layer, 24
Represents an aromatic polyamide fiber, and 35 represents a solid lubricant and / or an antiwear agent.

As in the first embodiment, the porous metal sintered layer 32 is formed by spraying an alloy powder of Cu and Sn on a back metal 31 of a steel plate or the like (including a steel plate coated with copper), and then sintering. And Cu-
A porous metal sintered layer of 10% Sn was formed.
The resin-coated sliding material 30 impregnates the porous metal sintered layer 32 with a mixture of an aromatic polyamide fiber 24, a solid lubricant and / or an anti-wear agent 35, and PTFE to form a surface resin layer 33. It is one formed by adhesion. Solid lubricant 3
5 is MoS ₂ or graphite, and the antiwear agent 35 is SiC, Al ₂ O ₃ , Si ₃ N ₄ or Si.
At least one of O ₂ is added.

Although the aromatic polyamide fibers are exposed on the bearing surface after the conformal abrasion, the aromatic polyamide fibers 24 are excellent in abrasion resistance, can support a load and can bring out the low friction property of PTFE, and the surface resin layer 33 is solid. By adding the lubricant and / or the antiwear agent 35, more durable lubrication performance can be obtained.

The method of manufacturing the resin-coated sliding material 30 of the present invention is similar to that of the resin-coated sliding material 20 of the first embodiment, in that an alloy powder of Cu and Sn is dispersed on a back metal 31 such as a steel plate. A metal sintering layer 32 is formed and wetted with a solution containing an organic solvent on the surface of the PTFE fine powder, and then the fine powder is mixed with the aromatic polyamide fiber 24, the solid lubricant and / or the antiwear agent 35. The resultant is sprayed on the porous metal sintered layer 32, impregnated and coated with a roll or the like, and then fired and applied to form the surface resin layer 33.

Next, a friction test performed on a sample of the resin-coated sliding member 30 of the present invention will be described.

In the friction and wear test, the load was 6 Mpa and the peripheral speed was 1
The test was performed under the conditions of 5 m / min and a test time of 1 hour. Table 2 shows the composition components and test results of test samples Nos. 7 to 13 for testing. Samples Nos. 7 to 13 are each formed by forming a surface resin layer 33 on a porous metal sintered layer 32 of Cu-10% Sn. The surface resin layer 33 has a predetermined volume% of PT.
And FE, and 50 volume% aromatic polyamide fiber 24, a predetermined volume% antiwear _{(SiC, Al 2 O 3,} Si 3 N 4
Or SiO ₂ ) and a solid lubricant (MoS ₂ or graphite).

The test results of Samples Nos. 7 to 13 are shown on the right side of Table 2. The test results of Samples Nos. 7 to 13 show that the wear amount was lower than the result in Table 1 of the first embodiment due to the mixing of the solid lubricant and / or the antiwear agent, and the friction coefficient during the test was Has stable sliding with no fluctuation,
No adhesion is seen on the sliding surface.

Therefore, the surface resin layer 33 has an abrasion amount within a better range of durability, and stable sliding is performed.

As described above, the resin-coated sliding member 30 of the second embodiment
Can effectively use an aromatic polyamide fiber and a solid lubricant and / or an anti-wear agent, and use no Pb to provide a lubrication performance with a wear resistance equal to or higher than that of the related art in consideration of environmental issues.

In the first and second embodiments, the PTF is used.
A mixture of fine powder of E and aromatic polyamide fiber 24, or a mixture of fine powder of PTFE and aromatic polyamide fiber 24 and a solid lubricant and / or an antiwear agent 35 is formed by porous metal firing. The surface resin layers 23 and 33 are formed by spraying on the tie layer 22. A mixture of PTFE fine powder and aromatic polyamide fiber 24, or a mixture of PTFE fine powder and aromatic polyamide fiber 24 and a mixture of a solid lubricant and / or an antiwear agent 35 previously formed into a sheet, or a fibrous aromatic polyamide fiber and a PTFE dispersion in an aqueous suspension are subjected to a fourdrinier machine. The sheet made into a dried paper-like material is overlaid on the porous metal sintered layers 22 and 32 to form the surface resin layers 23 and 33. And it can also be.

The sheet-like material is directly overlaid on the roughened metal backings 21 and 31 excluding the porous metal sintered layers 22 and 32, and pressed with a roll to form a resin-coated sliding material. Can also. In this case, as the back metal, an aluminum alloy plate or a copper alloy plate can be used in addition to the steel plate.

Further, the resin-coated sliding members 20, 30
Has been described in connection with examples of use in bearings, but is not limited thereto and can be used as various types of sliding members.

[0039]

The resin-coated sliding material of the present invention comprises a porous metal sintered layer formed on a back metal and a surface resin formed by being impregnated in the porous metal sintered layer. The surface resin layer is composed of 30 to 60% by volume of aromatic polyamide fiber and the remainder is made of PTFE. Therefore, an aromatic polyamide fiber is used effectively and Pb is not used, and environmental considerations are taken into consideration. Abrasion resistance of equal or higher than conventional wear resistance can be obtained. In addition, the conforming wear was completed at an early stage, and the surface resin layer 23 was stably slid without any change in the friction coefficient.

Further, it comprises a porous metal sintered layer formed on the backing metal, and a surface resin layer formed by being impregnated in the porous metal sintered layer. Since 30 to 60% by volume of aromatic polyamide fiber and the balance of PTFE and solid lubricant and / or antiwear agent, Pb is used by effectively using aromatic polyamide fiber and solid lubricant and / or antiwear agent. By doing so, it is possible to achieve lubrication performance with wear resistance equal to or higher than that of the related art in consideration of environmental issues. The familiar wear between the bearing surface and the shaft is completed at an early stage, and the surface resin layer 33 is stably slid with no change in the friction coefficient.

The solid lubricant is MoS ₂ or graphite, and the antiwear agent is SiC, Al ₂ O ₃ ,
Since at least one of Si ₃ N _{4 and} SiO ₂ is used, durable lubrication can be accurately obtained.

[0042]

[Table 1]

[0043]

[Table 2]

[Brief description of the drawings]

FIG. 1 is a sectional view of a resin-coated sliding member according to a first embodiment of the present invention.

FIG. 2 shows that the volume% of the aromatic polyamide fiber is based on the test results.
And a graph of the amount of wear.

FIG. 3 is a sectional view of a resin-coated sliding member according to a second embodiment of the present invention.

FIG. 4 shows a sectional view of a conventional resin-coated sliding member.

[Explanation of symbols]

 Reference Signs List 10 Conventional resin-coated sliding material 11, 21, 31 Back metal such as steel plate 12, 22, 32 Porous metal sintered layer 13 Surface resin layer containing lead 20, 30 Resin-coated sliding material 23, 33 Surface resin layer 24 Aromatic polyamide fiber 35 Solid lubricant and / or antiwear agent

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) C08L 77:10 F term (Reference) 3J011 QA05 SA03 SB19 SC03 SC05 SD01 SD02 SD04 SE04 SE05 SE06 4F071 AA27 AA56 AB03 AB06 AB18 AB26 AD03 AE11 AG12 AG28 AH18 EA03 EA05 4F100 AA09B AA12B AA16B AA19B AA20B AA37B AB01A AB01B AK17B AK47B BA02 CA19B CA23B CA30B DC11B DD20 DG01B EJ82B GB31 GB48 GB51 JK09

Claims (3)

[Claims] 1. A porous metal sintered layer adhered and formed on a back metal, and a surface resin layer adhered and formed in a state of being impregnated in the porous metal sintered layer. A resin-coated sliding material, comprising 30 to 60% by volume of aromatic polyamide fiber and the balance being PTFE. 2. A porous metal sintered layer adhered and formed on a back metal, and a surface resin layer adhered and formed in a state of being impregnated in the porous metal sintered layer. A resin-coated sliding material comprising 30 to 60% by volume of an aromatic polyamide fiber and the balance of PTFE and a solid lubricant and / or an antiwear agent. 3. The solid lubricant is MoS ₂ or graphite, and the antiwear agent is SiC, Al ₂ O ₃ , Si _3.
N ₄ or resin-coated sliding member according to claim 2, characterized by using the above at least one of SiO _2.