JPH1121576A - Sliding material and production of sliding material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a sliding material capable of being used under high-load conditions and capable of greatly reducing the amount of impregnation and environmental pollution. SOLUTION: This sliding material has a structure in which a tetra- to hepta- fluorinated cyclic ether 3 and an oil 4 are incorporated in the pores 1 of a matrix 2 as a pore-containing material containing at most 30 vol.% pores 1. The matrix 2 is fabricated from an Fe-Cu-C based sintered metal formed by a known powder metallurgy and contains an Fe component 2A and a Cu component 2B. Each pore 1 is formed in a size of several to several lens μm, and the content of pores 1 is 4-30 vol.%, based on the entire sliding material. The content of the tetra- to hepta-fluorinated cyclic ether 3 and the oil 4 is 50-98 vol.%, based on the pores 1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sliding material for a mechanical part, and more particularly to a sliding material formed by impregnating a porous material with a resin in order to improve abrasion resistance and reduce a friction coefficient. About.

[0002]

2. Description of the Related Art Conventionally, porous materials in which pores are impregnated with a self-lubricating polymer resin for the purpose of improving abrasion resistance and reducing a friction coefficient in sliding materials for mechanical parts. Materials are used. Known techniques relating to such materials include, for example, JP-A-8-112483, JP-A-8-11803, and JP-A-7-4.
No. 8588. In JP-A-8-112483, a porous sintered metal having a porosity of about 50% by volume is impregnated with a high-molecular-weight fluororesin as a main component and further added with a low-molecular-weight fluororesin and powdered lead. A disclosed sliding material is disclosed. In JP-A-8-11803, an ethylene tetrafluoride resin having a particle diameter of 0.2 to 0.2 is used.
0.4 μm emulsified state, solid lubricant powder is uniformly mixed and co-coagulated to form a resin powder, which is wetted with an organic solvent. A multi-layer bearing formed by spraying on a porous metal sintered layer formed as described above, press-coating, and then heating to remove an organic solvent and firing it is disclosed. JP 7
JP-B-48588 discloses a bearing in which a porous sintered material is impregnated with a silicone synthetic oil containing an oligomer of chlorofluoroethylene.

[0003]

The following problems exist in the sliding material according to the above-mentioned known technology. JP-A-8-1214
The sliding material disclosed in No. 83 is based on the assumption that the sliding material is used under relatively low load conditions, such as a bearing that supports a rotating shaft of a hydraulic machine and a sliding portion of a cylinder that receives a reciprocating piston. A porous material having a relatively high porosity of about 50% by volume is used, and the material is impregnated with a fluororesin. On the other hand, when applied to moving structural members or sliding sliding members in a compressor, the strength of the porous material itself is increased because it is used under relatively high load conditions and a high sliding surface pressure is applied. And its porosity must be reduced to 30% by volume or less.
However, in the impregnation method described in the above publication, it is difficult to impregnate the inside of a porous material having a low porosity with a fluororesin, so that it cannot be applied to a sliding material used under high load conditions. In addition, since lead is impregnated, there is also a problem that it is difficult to completely prevent elution of lead as a pollutant in a refrigerant atmosphere. Also, JP-A-8-1
The sliding material disclosed in Japanese Patent No. 1803 is also supposed to be used under relatively low load conditions, for example, a bush of an automobile shock absorber, and has a relatively high porosity in view of the amount of resin powder to be impregnated. The configuration is applicable only to porous metal. Therefore, it cannot be applied to sliding materials used under high load conditions, as in the above-mentioned known technology. Furthermore, the sliding material disclosed in Japanese Patent Application Laid-Open No. 7-48588 is also premised on being used under relatively low-speed but low-load conditions, such as bearings for audio and video equipment.
Like the above two known techniques, it cannot be applied to sliding materials used under high load conditions.

As described above, since the above three known techniques are premised on being used under relatively low load conditions, it is difficult to apply them to sliding materials used under high load conditions. is there. On the other hand, as a known technique relating to a sliding material that is assumed to be used under such a high load condition, there is, for example, JP-A-8-109450. In this gazette, the base in which iron-carbon martensite exhibiting excellent performance in high surface pressure sliding exists, a copper phase or a copper alloy phase having good sliding familiarity and a martensite having good wear resistance are used. A sliding material in which hard alloy particles are dispersed and impregnated with turbine oil is disclosed.

However, this sliding material is disclosed in Japanese Patent Application Laid-Open Nos. 8-112483 and 8-118.
Unlike JP-A-03, the impregnation with only oil, not resin, improves the wear resistance and reduces the friction coefficient. At this time, since this oil exists in a liquid state in the material, a liquid leak occurs during operation, and it is difficult to prevent or sufficiently reduce the contamination of the surroundings due to a decrease in the amount of impregnation or a flow out. is there.

An object of the present invention is to provide a sliding material which can be used under a high load condition and which can sufficiently reduce the amount of impregnation and the pollution to the surroundings.

[0007]

[Means for Solving the Problems]

(1) In order to achieve the above object, a first concept of the present invention is that a ratio of the vacancy or the concave portion of a vacancy-containing material having a porosity of 30% by volume or less is 30% by volume or less. In the concave portion of the surface irregularity material having irregularities formed on the surface so that
4 to 7 fluorinated cyclic ether or 4 to 7 fluorinated cyclic ether and oil are contained. The 4 to 7 fluorinated cyclic ethers are provided with bonding hands in all three directions of X, Y, and Z based on the unique amorphous nature, and can be relatively freely deformed. Thereby, the porosity of the porosity-containing material is 30% by volume.
30% by volume or below
Even if it is as low as the following, it can easily enter the holes or recesses. Further, the 4-7 fluorinated cyclic ether has a CFＣＦO group at the terminal at the time of the reaction, and has a property that the adhesion to other substances is good by this group. Therefore, it is possible to reduce the rate of once flowing into the holes or recesses and then flowing out again from the holes or recesses. As a result, even when the proportion of the voids or recesses is 30% by volume or less, the 4 to 7 fluorinated cyclic ether can be surely and uniformly impregnated into the voids or recesses. Therefore, the 4-7 fluorinated cyclic ether (or the 4-7 fluorinated cyclic ether and oil)
Because of the self-lubricating property, it is possible to improve the wear resistance and reduce the coefficient of friction, thus realizing a sliding material that can be used even when a high sliding surface pressure is applied under relatively high load conditions. be able to.

(2) In the above (1), preferably,
The proportion of the voids or recesses is 4% by volume or more and 30% by volume or less.

(3) In the above item (1), preferably, the content of the 4 to 7 fluorinated cyclic ether or the 4 to 7 fluorinated cyclic ether and oil with respect to the pores or the concave portions is 50 vol. % To 98% by volume.

(4) In order to achieve the above object, a second concept of the present invention is that the ratio of the voids or the concave portions of the void-containing material having a void ratio of 30% by volume or less is 30% by volume or less. A fluorine-based resin or a fluorine-based resin and oil are contained in the concave portion of the surface unevenness material having unevenness formed on the surface so as to have a volume percent or less.

(5) In order to further achieve the above object,
A third concept of the present invention is to dissolve a 4 to 7 fluorinated cyclic ether in a solvent to form a solution, and to have a void content of 30% by volume or less or a void content of 30% by volume or less. After impregnating the solution or the solution and the oil with the surface irregularity material having the irregularities formed on the surface so as to be dried, and removing the solvent by drying, the 4 to Heterocyclic ether or 4 to 7 fluorinated cyclic ether and oil are contained.

(6) In the above (5), preferably,
A perfluoro solution is used as the solvent.

(7) In order to achieve the above object, a fourth concept of the present invention is to provide a solution obtained by dissolving a fluorine-based resin in a solvent and having a pore content of 30% by volume or less. After impregnating the solution or the solution and the oil with a surface irregularity material having irregularities on its surface such that the proportion of the material or the concave portion is 30% by volume or less, by drying and removing the solvent, The fluorinated resin or the fluorinated resin and oil are contained in the cavities or concave portions.

[0014]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a first embodiment of the present invention.
This will be described with reference to FIG. The present embodiment is an embodiment relating to a sliding material used for parts in a sliding portion of various machines and a method for manufacturing the same. FIG. 1 is a sectional view showing a partial structure of the sliding material according to the present embodiment. As shown in FIG. 1, the sliding material according to the present embodiment has
The pores 1 have a structure in which 4 to 7 fluorinated cyclic ethers 3 and an oil 4 are contained in the pores 1 with respect to a base material 2 as a pore-containing material which is contained at a ratio of not more than volume%.

At this time, the base material 2 is made of a Fe—Cu—C based sintered metal formed by a known powder metallurgy method, and contains a Fe component 2A and a Cu component 2B. The pores 1 are formed to have a size of, for example, several μm to several tens μm, and the content of the pores 1 in the entire sliding material (hereinafter, referred to as porosity) is 4% by volume to 30% by volume. It is configured as follows. Furthermore, the void 1 as described above
The content of 4 to 7 fluorinated cyclic ethers 3 and oil 4 (hereinafter referred to as a filling rate) is at least 50% by volume and at least 98% by volume.
It is configured as follows.

A method for manufacturing the sliding material will be described below. First, by a known powder metallurgy method, the porosity is 4% by volume.
Fe is adjusted in advance so that it is at least 30% by volume.
Molding and sintering a powder containing Cu to form the base material 2; At this time, the material of the metal powder to be sintered is selected according to the required specifications and cost setting when used as a sliding component / sliding structure material. At this time, the porosity may be appropriately adjusted in the range of 4% by volume or more and 30% by volume or less according to the cost and required specifications. More preferred.

At this time, on the other hand, the 4 to 7 fluorinated cyclic ether polymer is dissolved in a solvent such as a perfluoro solution to prepare a liquid solution. FIG. 2 shows the chemical structure of the 4-7 fluorinated cyclic ether polymer. In FIG.
As shown in _{(a), CF 2 = CF} 2 -O- (C
F ₂ ) x-CF = CF ₂ (where x = 1, 2, 3), n monomers are polymerized cyclically, and a polymer of a 4-7 fluorinated cyclic ether as shown in (b) Are formed. At this time, what is dissolved in the solvent is not limited to the polymer of 4 to 7 fluorinated cyclic ethers, but may be a polymer of another substance containing 4 to 7 fluorinated cyclic ethers.

Then, the sintered base material 2 is immersed in the solution, whereby the pores 1 of the base material 2 are impregnated with the solution. At this time, the 4 to 7 fluorinated cyclic ethers in the impregnated solution form bonding hands X, Y,
Since it is provided in any of the three directions of the Z direction, relatively free deformation is possible. Thereby, even for the base material 2 in which the ratio of the pores 1 is as low as 30% by volume or less, the
Can easily get into it. At this time, the 4 to 7 fluorinated cyclic ethers in the solution have a property that they have good adhesion to other substances. This will be described with reference to FIG. In FIG. 3, the polymer of the 4 to 7 fluorinated cyclic ethers is, at the time of the reaction, firstly partly cut off in a cyclic structure as shown in FIG.
The position indicated by the dashed line in (a) is further cut, and CF ₂ (CF ₂ )
xCF = CF ₂ and a polymer having a terminal CFＣＦO group. Since this terminal group can be easily modified into a carbonyl group -CO or a carboxyl group -COOH having excellent adhesion, it is possible to reduce the ratio of once entering the pore 1 and then re-flowing from the pore 1. it can. As described above, even in the case of the base material 2 in which the ratio of the pores 2 is as low as 30% by volume or less, the 4 to 7 fluorinated cyclic ethers 3 can be impregnated into the pores 1 efficiently, reliably, and uniformly. At this time, the solution penetrates into the pores 1 by a method of only immersion, but other known impregnation methods such as a vacuum impregnation method, a pressure impregnation method, and a method of applying vibration may be performed.

After the solution is impregnated in this way, the base material 2 is taken out of the solution and heated at about 60 to 180 ° C. at which the perfluoro solution evaporates. As a result, the perfluoro solution in the pores 1 is removed, and only the 4 to 7 fluorinated cyclic ethers 3 are contained in the pores 1. At this time, drying may be performed naturally without performing forced drying by heating. The 4 to 7 fluorinated cyclic ethers 3 are contained in the pores 1 as described above. For the oil 4, the base material 2 is immersed in the oil, and vacuum impregnation (or It is sufficient to impregnate the pores 1 with oil by performing pressure impregnation), and a detailed description thereof will be omitted. The impregnation of the oil 4 is performed before and after the impregnation of the 4 to 7 fluorinated cyclic ether 3 as appropriate. However, it is preferable that the type of oil and its viscosity are appropriately selected according to the usage environment of the sliding material (for example, turbine oil when used for a sliding portion of a turbine).

As described above, according to the sliding material of this embodiment, the self-lubricating properties of the 4 to 7 fluorinated cyclic ether 3 and the oil 4 improve the wear resistance of the base material 2 and reduce the friction coefficient. Therefore, it is possible to realize a sliding material that can be used even when a high sliding surface pressure is applied under relatively high load conditions. This effect will be described more specifically with reference to FIG. FIG. 4 shows a test result of a sliding test in oil performed using an example of the sliding material according to the present embodiment, and shows a time change of the friction coefficient μ. The porosity of the base material 2 was about 17% by volume, and the filling rate was about 90% by volume (about 60% of 4 to 7 fluorinated cyclic ethers + about 30% of oil). The test results of the samples that were not subjected to the impregnation treatment are also shown as comparative examples. As is clear from FIG. 4, in the comparative example where no treatment was performed, the friction coefficient reached 0.4 in about one minute from the start of the test. Although the increase in the coefficient of friction is slightly observed, the coefficient gradually decreases thereafter and remains stable at about 0.03, indicating that the effect of reducing the coefficient of friction is remarkably exhibited. Therefore, for example, in sliding bearings where the oil film is easy to break, sliding materials and structural materials for sliding parts where it is difficult to form an oil film, bearing components that dislike oil leakage, and sliding components that are used in an unlubricated state. Even when applied, there is no seizure or abnormal wear. In addition, since the friction coefficient can be reduced, it also has the effect of improving driving performance. Further, it is possible to supply a sliding material of stable quality at a relatively low manufacturing cost.

As means for improving the wear resistance and reducing the friction coefficient, not only the oil 4 but also the 4-7 fluorinated cyclic ether 3 is used, so that the conventional structure in which only the oil is impregnated is used. As a result, the amount of impregnation during operation and the pollution to the surroundings can be sufficiently reduced. Further, there is an effect that the heat resistance can be improved as compared with the case where only oil is impregnated.

In the first embodiment, 4-7 fluorinated cyclic ether 3 and oil 4
However, the present invention is not limited to this, and only 4 to 7 fluorinated cyclic ethers 3 may be included. In this case, a similar effect is obtained. Further, in the first embodiment, the sintered metal in which the pores 1 are contained at a ratio of 30% by volume or less by the powder metallurgy method is used as the base material 2, but the present invention is not limited to this. For example, irregularities are formed on the surface of the metal material by rapidly heating and melting the surface with a high-density energy generation source (eg, laser or plasma), and the proportion of the concave portion at this time is 30% by volume or less. The roughened surface material may be used as the base material 2. In this case, a similar effect is obtained.

Next, an embodiment in which the sliding material having the above configuration is used as a mechanical part will be described. First, a second embodiment of the present invention will be described with reference to FIG. This embodiment is an embodiment of a scroll compressor provided with a slide bearing made of the sliding material.

FIG. 5 is a side sectional view showing the structure of the scroll compressor according to the present embodiment. The scroll compressor shown in FIG.
, A substantially spiral fixed scroll 104 fixed to the frame 102 via a plurality of bolts 103, and a motor unit 10 serving as a driving force generating source.
5, a main shaft 106 to which a driving force is applied by the motor unit 105, and a main shaft 1 provided at the center of the frame 102.
06 is rotatably supported, and is disposed so as to mesh with the fixed scroll 104.
06, a substantially spiral orbiting scroll 108 driven by an eccentric boss 106A formed in the upper part, and a compression chamber 109 formed between the fixed scroll 104 and the orbiting scroll 108. Also, the orbiting scroll 108
An Oldham ring 113 is disposed between the ring and the frame 102. At this time, key grooves are formed in the orbiting scroll 108 and the frame 102, respectively, and the key portion of the Oldham ring 113 is inserted into these key grooves, thereby restricting the time point of the orbiting scroll 108 to make a orbital motion. It has become. In the above description, the plain bearing 107 and the Oldham ring 113 are the first
And the sliding material described in the embodiment. Then, the refrigerant gas sucked from the suction pipe 110 is compressed in the compression chamber 109 by the orbiting motion of the orbiting scroll 108 driven by the rotation of the main shaft 106,
The liquid is discharged from the discharge holes 111 to the upper portion of the fixed scroll 104 (see solid arrows). Further, the gas enters the motor unit 105 once, cools the motor unit 105 and separates the lubricating oil (see the dashed arrow) contained in the gas, and then flows out of the compressor through the discharge pipe 112. ing.

According to this embodiment, a sliding material capable of improving the wear resistance and reducing the friction coefficient even under a high load condition as described in the first embodiment is applied to the sliding bearing 107 and the Oldham ring 113. By doing so, there is an effect that the durability in the non-lubricated operation state, the high load sliding characteristic due to the local load, and the high speed operation characteristic required for the bearing supporting the main shaft 106 of the scroll compressor are satisfied.

Next, a third embodiment of the present invention will be described with reference to FIGS. This embodiment is an embodiment of a hermetic swirl type compressor equipped with a swirl piston made of a sliding material according to the first embodiment.

FIG. 6 is a longitudinal sectional view showing a main part structure of the compressor according to the present embodiment, and FIG. 7 is a transverse sectional view taken along the line VII-VII in FIG. 6 and 7, the compressor according to the present embodiment has a closed container 20 storing lubricating oil at the bottom.
1, a cylinder 202 having an inner wall 202A disposed in the closed vessel 201 and having a continuous curved cross-sectional shape, and an outer wall 204A provided to face the inner wall 202A of the cylinder 202; The outer wall 204 A and the inner wall 202 of the cylinder 202
A to form a plurality of working chambers 203.
4, a motor unit (not shown) that is a driving force generation source, a drive shaft 205 whose lower end is immersed in lubricating oil under the closed container 201 and is provided with a rotational force by the motor unit, And a crank 205A that fits into a bearing at the center of the revolving piston 204 to drive the revolving piston 204, and also functions as an end plate that supports the drive shaft 205 and closes both ends of the cylinder 202. A main bearing 206 and a sub-bearing 208 which also serve as a suction port 206A formed in the main bearing 206, a discharge port 208A formed in the sub-bearing 208, and a reed valve type for opening / closing the discharge port 208A (open / close by differential pressure). ) Discharge valve 209
And the suction cover 210 attached to the main bearing 206
And a discharge cover 212 for forming a discharge chamber 211 together with the sub-bearing 208, a suction pipe 213 for introducing refrigerant gas, a discharge pipe 214 for discharging compressed refrigerant gas, and a hermetically sealed interior of the discharge chamber 211. A seal member 215 such as an O-ring for partitioning the pressure in the container 201 is provided.

The cross-sectional shape of the inner wall 202A of the cylinder 202 is formed such that three hollow portions shaped like ginkgo leaves are disposed at every 120 ° around the central axis O '. At the end of each ginkgo-shaped hollow portion, a substantially arc-shaped vane 202B protruding inward is provided. Further, the revolving piston 204 has an axis O whose rotation center is eccentric from the center axis O ′ of the cylinder 202 by ε, and 120 ° around the center axis O corresponding to the shape of the cylinder 202 as described above. The same shape is repeated every time. The revolving piston 204 is disposed inside the cylinder 202 at a position where the outer wall 204A meshes with the inner wall 202A of the cylinder 202. FIG. 8A is a top view showing the detailed shape of the revolving piston 204, and FIG. 8B is a side view as viewed from the direction A in FIG. 8A. The revolving piston having such a shape is made of the sliding material described in the first embodiment. In addition, if the center axis O ′ and the center axis O are assumed to coincide with each other, the cylinder 202 and the revolving piston 204 have a relationship such that a gap having a constant width is formed between the two contours. I have.

Referring back to FIGS. 6 and 7, in the above configuration, the working gas (refrigerant gas) that has entered the closed vessel 201 through the suction pipe 213 enters the suction cover 210 attached to the main bearing 206. Is introduced into the working chamber 203 through a suction port 206A formed in the main bearing 206. At this time, the rotation of the drive shaft 205 causes the revolving piston 204 to perform a revolving motion, thereby reducing the volume of the working chamber 203 and compressing the refrigerant gas. The compressed gas passes through the discharge port 208A of the auxiliary bearing 208 and the discharge valve 20.
9 is pushed up into the discharge chamber 211 and the discharge pipe 21
It flows out through 4. At this time, the refrigerant gas also flows through the gap formed between the suction pipe 213 and the suction cover 210 to the motor section, thereby cooling the motor section.

According to this embodiment, as described in the first embodiment, the sliding material capable of improving the wear resistance and reducing the friction coefficient even under a high load condition is applied to the revolving piston 204. It is required to satisfy the affinity required for the revolving piston 204 of the hermetic type revolving compressor, that is, the property of hardly abrading the cylinder 202, that is, the property of retaining the oil film and the lubricating film, and the property of protecting metal from contact. it can. At this time, it is also possible to reliably prevent the refrigerant gas as the compression medium from leaking through the holes of the sintered metal.

In the third embodiment, only the revolving piston 204 is made of the sliding material of the first embodiment. However, the present invention is not limited to this, and the cylinder 202 may be made of the sliding material of the first embodiment. Or both the revolving piston 204 and the cylinder 202 may be made of the sliding material of the first embodiment. In this case, a similar effect is obtained.

[0032]

According to the present invention, the wear resistance is improved and the friction coefficient is reduced by the self-lubricating property of the 4-7 fluorinated cyclic ether (or the 4-7 fluorinated cyclic ether and oil). Therefore, a sliding material that can be used under relatively high load conditions and that can sufficiently reduce the amount of impregnation and the contamination to the surroundings can be realized. At this time, since at least a part uses 4 to 7 fluorinated cyclic ethers as means for improving the wear resistance and reducing the friction coefficient, unlike the conventional structure in which only oil is impregnated, the impregnation amount during operation is reduced. Reduction and contamination to the surroundings can be sufficiently reduced. Further, there is an effect that the heat resistance can be improved as compared with the case where only oil is impregnated.

[Brief description of the drawings]

FIG. 1 is a sectional view illustrating a partial structure of a sliding material according to a first embodiment of the present invention.

FIG. 2 is a view showing a chemical structure of a 4 to 7 fluorinated cyclic ether polymer.

FIG. 3 is a diagram for explaining good adhesion of 4 to 7 fluorinated cyclic ethers in a solution.

FIG. 4 is a view showing test results of a sliding test in oil.

FIG. 5 is a side sectional view illustrating a structure of a scroll compressor according to a second embodiment of the present invention.

FIG. 6 is a longitudinal sectional view illustrating a main structure of a compressor according to a third embodiment of the present invention.

FIG. 7 is a transverse sectional view taken along the line VII-VII in FIG. 6;

8A and 8B are a top view showing a detailed shape of the revolving piston and a side view seen from the direction A.

[Explanation of symbols]

 Reference Signs List 1 vacancy 2 base material (vacancy-containing material) 3 4 to 7 fluorinated cyclic ether 4 oil

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁶ Identification code FI C10M 101: 02) C10N 40:02 40:06 40:12 50:08 (72) Inventor Yuji Yoshitomi 502, Katemachi, Tsuchiura-shi, Ibaraki Pref. Address Machinery Research Laboratory, Hitachi, Ltd. Hitachi, Ltd. Living Equipment Division (72) Inventor Koichi Inaba 800, Tomita, Ohira-cho, Ohira-cho, Shimotsuga-gun, Ibaraki Prefecture Living Equipment Division, Hitachi, Ltd.

Claims (7)

[Claims] 2. The method according to claim 1, wherein the concave portion of the surface irregularity material has a concave and convex portion formed on the surface so that the ratio of the pores or concave portions of the pore-containing material having a pore ratio of 30% by volume or less is 30% by volume or less. A sliding material characterized in that a part thereof contains 4 to 7 fluorinated cyclic ethers or 4 to 7 fluorinated cyclic ethers and oil. 2. The sliding material according to claim 1, wherein the proportion of the voids or recesses is not less than 4% by volume and not more than 30% by volume. 3. The sliding material according to claim 1, wherein
The content of the fluorinated cyclic ether or the fluorinated cyclic ether or the oil with the fluorinated cyclic ether and the oil is 5
A sliding material characterized by being at least 0% by volume and at most 98% by volume. 4. The void or concave portion of a surface asperity material in which the surface has irregularities such that the percentage of voids is 30% by volume or less or the void-containing material or the concave portion has a volume of 30% by volume or less. A sliding material comprising a fluorine-based resin or a fluorine-based resin and oil. 5. A solution obtained by dissolving 4 to 7 fluorinated cyclic ethers in a solvent so that the proportion of vacancy-containing material having a porosity of 30% by volume or less or the proportion of concave portions is 30% by volume or less. After impregnating the surface irregularity material having irregularities on the surface with the solution or the solution and the oil, and drying and removing the solvent, the 4 to 7 fluorinated ring is formed in the holes or the concave portions. A method for producing a sliding material, comprising adding ether or 4 to 7 fluorinated cyclic ethers and oil. 6. A method of manufacturing a sliding material according to claim 5, wherein a perfluoro solution is used as said solvent. 7. A solution obtained by dissolving a fluororesin in a solvent,
The solution or the solution and oil are impregnated into a hole-containing material having a void ratio of 30% by volume or less or a surface unevenness material having irregularities formed on its surface such that the ratio of concave portions is 30% by volume or less. And then drying the solvent to remove the solvent, so that the fluorine resin or the fluorine resin and oil are contained in the pores or recesses.