JP2003021144A - Resin composite sliding member and manufacturing method of the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve the problems in a resin composite sliding member compositely combining a glass fiber excelling in mechanical strength in a tetrafluoroethylene resin excelling in sliding performance, which has an excellent sliding characteristic and abrasion resistance, in using as a sliding member such as a bearing and a shaft seal in oil because of its lubricant function to form an oil film over a sliding surface, and synergizes with the excellent sliding performance of the tetrafluoroethylene resin itself where as in an underwater use, a liquid film of water is hard to form and a lubricating action is lowered to deteriorate a sliding characteristic, and the glass fiber, which is generally harder than a mating member in sliding contact, lowers abrasion resistance as a resin system composite material. SOLUTION: A tetrafluoroethylene resin matrix includes a fibrous filler or particulate filler with self-lubricity, and the hardness of the filler is set at most equivalent to the strength of a mating member in sliding contact with the resin system composite sliding member. The resin composite sliding member can thus have an excellent sliding characteristic and excel in abrasion resistance.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a resin-based composite sliding member used for bearings, shaft seals, etc., which are in sliding contact with a member that rotates or reciprocates in water, and a method for manufacturing the same.

[0002]

2. Description of the Related Art In recent years, along with the development of industrial technology, there has been an increasing demand for a material having a plurality of functions which is difficult to realize with a single material, for example, a composite material obtained by compositing two kinds of materials having different characteristics. To combine these two materials,
A composite material can be manufactured by applying a blending method or the like.

By the way, the properties required for composite materials are becoming more complex, and it is also required to combine tetrafluoroethylene resin, which has excellent sliding performance, with glass fiber, which has excellent mechanical strength. There is. When this glass fiber reinforced tetrafluoroethylene resin-based composite material is used for sliding members such as bearings and shaft seals in oil, oil acts as a lubricant to form an oil film on the sliding surface. Excellent sliding characteristics are obtained by the synergistic effect with the excellent sliding performance of the resin itself, and wear resistance is also greatly improved.

[0004]

However, when the glass fiber reinforced tetrafluoroethylene resin-based composite material is used as a sliding member such as an underwater bearing or shaft seal, a liquid film of water is formed as compared with oil. Difficult to lubricate. Furthermore, since glass fibers are generally harder than the material of the mating member that contacts sliding members such as bearings and shaft seals, the wear resistance of the tetrafluoroethylene resin-based composite material may decrease.

The present invention eliminates the above drawbacks and provides a resin-based composite sliding member used for underwater bearings, shaft seals, etc., with high strength, low friction coefficient, and excellent sliding performance.
Another object is to provide a resin-based composite sliding member having excellent wear resistance.

[0006]

In order to achieve the above object, in the resin-based composite sliding member of the present invention, in the invention described in claim 1, sliding contact is made with a member that rotates or reciprocates in water. The resin-based composite sliding member is characterized by using a composite material containing a self-lubricating filler in an ethylene tetrafluoride resin matrix. By doing so, excellent sliding characteristics can be obtained by the self-lubricating filler.

According to the second aspect of the present invention, in the resin-based composite sliding member that is in sliding contact with a member that rotates or reciprocates in water, the tetrafluoroethylene resin matrix is filled with self-lubricating properties. The hardness of the filler containing the material is equal to or less than the hardness of the mating member that is in sliding contact with the sliding surface of the sliding member. In this case, the hardness of the filler is equal to or less than the hardness of the mating member, so that the wear resistance of the resin-based composite member is improved.

According to the third aspect of the present invention, in a resin-based composite sliding member that makes sliding contact with a member that rotates or reciprocates in water, carbon fiber and graphite particles are contained in a tetrafluoroethylene resin matrix. A composite material containing at least one kind of filler selected from boron nitride particles, molybdenum disulfide particles, and tungsten disulfide particles. By doing so, high strength is achieved by the action of the fibrous filler or the particulate filler,
Excellent friction characteristics with low coefficient of friction.

Further, in the invention described in claim 4, the volume ratio of the filler in the resin composite sliding member described in claims 1 to 3 is in the range of 2.5% to 30%. Is characterized by.

In the resin-based composite sliding member having such a structure, the volume ratio of the filler is in the range of 2.5% to 30%, which is appropriately set according to the required characteristics of the sliding member. .
If the volume ratio is less than 2.5%, the effect of the filler cannot be sufficiently obtained, and if the volume ratio exceeds 30%, the excellent sliding performance of the tetrafluoroethylene resin matrix in the composite material is exhibited. This is not possible, and the wear resistance of the entire composite material deteriorates. The more preferable range of the volume ratio is 10% to 20%.
Is the range.

Further, in the invention described in claim 5, the filler in the resin-based composite sliding member according to claims 1 to 3 has an average cross-sectional diameter of 0.1 μm to 500 μm, or a fibrous filler. It is characterized by being a particulate filler having a particle diameter in the range of 0.1 μm to 500 μm.

In the resin-based composite sliding member having such a structure, the average cross-sectional diameter of the fibrous filler is 0.1 μm to 500 μm.
And is set appropriately according to the required characteristics of the sliding member. When the average cross-sectional diameter is less than 0.1 μm, it is practically difficult to produce fibers. When the average cross-sectional diameter exceeds 500 μm, the effect of dispersing the fibers in the tetrafluoroethylene resin matrix cannot be sufficiently obtained, and the composite material is obtained. May not be able to secure the characteristics of. A more preferable range of the average cross-sectional diameter is in the range of 1 μm to 50 μm.

The average particle diameter of the particulate filler is in the range of 0.1 μm to 500 μm, and is appropriately set according to the required characteristics of the sliding member. If the average particle diameter is less than 0.1 μm, it is difficult to practically produce particles, and if the average particle diameter exceeds 500 μm, the effect of dispersing particles in the tetrafluoroethylene resin matrix cannot be sufficiently obtained, and the composite material is obtained. May not be able to secure the characteristics of. The more preferable range of the average particle diameter is 1 μm to 5
It is in the range of 0 μm.

Further, in the invention described in claim 6, in the resin-based composite sliding member according to claim 1 or 2, carbon fiber and graphite particles, boron nitride particles, and disulfide are contained in an ethylene tetrafluoride resin matrix. One of the particulate fillers selected from molybdenum particles and tungsten disulfide particles is contained, and the total volume ratio of these fillers is in the range of 5% to 30%.

In the resin-based composite sliding member having such a structure, the total volume ratio of the fibrous filler and the particulate filler is
It is in the range of 5% to 30%, and is appropriately set according to the required characteristics of the sliding member. The total volume ratio is 5
%, The effect of the filler cannot be sufficiently obtained, and when the volume ratio exceeds 30%, the excellent sliding property of the tetrafluoroethylene resin matrix in the composite material cannot be exhibited.
The wear resistance of the entire composite material deteriorates. A more preferable range of the total volume ratio is 10% to 20%.

Further, in the invention described in claim 7, the tetrafluoroethylene resin powder serving as a matrix and the filler are mixed, the mixture is pressure-molded, and then heated to heat the tetrafluoroethylene resin. The resin-based composite sliding member is manufactured by fusion-bonding the powder.

In the invention described in claim 8, the tetrafluoroethylene resin powder serving as a matrix is mixed with the filler, and the mixture is pressurized to form voids in the porous intermediate layer formed on the base metal. Part, and the mixture is pressure-molded to form a sliding layer on the upper part of the porous intermediate layer, followed by heating to fusion-bond the tetrafluoroethylene resin powder to the resin-based composite sliding member. Is manufactured.

In the invention described in claim 9, the tetrafluoroethylene resin powder serving as a matrix and the filler are mixed, the mixture is pressure-molded and then heated to heat the tetrafluoroethylene resin powder. Is subjected to a fusion treatment, and the total volume ratio of the fillers after the fusion treatment is set to fall within the range of 2.5% to 30%.

In the resin-based composite sliding member having such a constitution, the total volume ratio of the fillers after heating and fusion treatment is
The range is 2.5% to 30%, and is appropriately set according to the required characteristics of the sliding member. If the total volume ratio is less than 2.5%, the effect of the filler cannot be sufficiently obtained, and if the total volume ratio exceeds 30%, the sliding property of the tetrafluoroethylene resin matrix in the composite material is excellent. Cannot be exhibited, and the wear resistance of the entire composite material deteriorates. A more preferable range of the total volume ratio is 10% to 20%.

[0020]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below. FIG. 1 is a sectional view schematically showing a resin-based composite sliding member according to the first embodiment of the present invention. In the figure, 1 is an ethylene tetrafluoride resin forming a matrix of the resin-based composite sliding member, and 2 is a fibrous filler having self-lubricating property. The fibrous filler 2 has a hardness that is equal to or less than the hardness of a mating member that is in sliding contact with the sliding surface of the resin-based composite sliding member. It is selected from those that will be the strengthening component of. For example, carbon fiber is suitable. To manufacture the resin-based composite sliding member, first, the powder of the tetrafluoroethylene resin 1 serving as a matrix and the fibrous filler 2 are mixed and pressure-molded into a predetermined shape. Then, the molded body is heated to a predetermined temperature and the powder of the tetrafluoroethylene resin 1 is fusion-bonded to obtain a resin-based composite sliding member having required characteristics.

FIG. 2 is a view showing a second embodiment of the present invention. In addition to the resin-based composite sliding member shown in FIG. 1, a particulate filler 3 having self-lubricating property is further added to ethylene tetrafluoride. An example in which the resin is contained is shown. The particulate filler 3 is selected from those whose hardness is equal to or less than the hardness of the mating member that is in sliding contact with the sliding surface of the resin-based composite sliding member. For example, graphite, boron nitride, molybdenum disulfide, tungsten disulfide, etc. are suitable. In order to manufacture this resin-based composite sliding member, first, a powder of a tetrafluoroethylene resin 1 serving as a matrix, the fibrous filler 2 and the particulate filler 3 are mixed and pressed into a predetermined shape. Mold. Then, the molded body is heated to a predetermined temperature and the powder of the tetrafluoroethylene resin 1 is fusion-bonded to obtain a resin-based composite sliding member having required characteristics.

FIG. 3 is a view showing a third embodiment of the present invention, which is a resin composite in which a fibrous filler 2 and a particulate filler 3 are contained in a matrix of tetrafluoroethylene resin 1. The case where the sliding member is joined to the base metal 4 is shown. In order to manufacture this resin-based composite sliding member, first, the powder of the tetrafluoroethylene resin 1 serving as a matrix is mixed with the fibrous filler 2 and the particulate filler 3. The mixture is pressed to impregnate the voids of the porous intermediate layer 5 formed on the base metal 4 in advance, and at the same time, the mixture is pressure-molded to form a sliding layer having a predetermined shape on the upper portion of the porous intermediate layer 5. 6 is provided. Then, it is heated to a predetermined temperature to perform fusion treatment on the tetrafluoroethylene resin powder to form a composite. The resin-based composite sliding member having the required characteristics can be obtained by manufacturing by the above method.

Next, specific examples of the present invention will be described. Example 1 10% by volume of carbon fiber having an average cross-sectional diameter of 10 μm and 90% by volume of ethylene tetrafluoride resin powder were mixed, the mixture was filled in a mold, and 10 mm × 120 mm at a pressure of 40 MPa.
It was pressed into a shape of × 120 mm. Next, the pressure-molded body is heated at a temperature of 380 ° C. for 2 hours to fuse and bond the tetrafluoroethylene resin powders together, and as shown in FIG. 1, 10 vol% carbon fiber and 90 vol% A resin-based composite sliding member with the tetrafluoroethylene resin was obtained.

As a result of evaluating the mechanical characteristics of the obtained resin-based composite sliding member, the tensile strength was about 25 MPa and 10
It was equivalent to an ethylene tetrafluoride resin-based composite material containing a volume% of glass fiber. As a result of evaluating the sliding characteristics in water, the coefficient of dynamic friction was 0.1 or less, which was equivalent to that of the tetrafluoroethylene resin alone containing no filler.
In addition, the amount of wear was very small, almost equal to that of the above-mentioned tetrafluoroethylene resin alone, and about 1/10 of that of the above 10% by volume glass fiber reinforced tetrafluoroethylene resin-based composite material.

Example 2 10% by volume of carbon fiber having an average cross-sectional diameter of 10 μm, 10% by volume of graphite particles having an average particle size of 30 μm, and 80% by volume of tetrafluoroethylene resin powder were mixed, and the mixture was filled in a mold. 10 mm x 120 m at a pressure of 45 MPa
It was pressure molded into a shape of m × 120 mm. Next, the pressure-molded body was heated at a temperature of 380 ° C. for 2 hours to fuse and bond the tetrafluoroethylene resin powders together, and as shown in FIG. 2, 10 vol% carbon fiber and 10 vol% To obtain a resin-based composite sliding member containing the graphite particles of Example 1 and 80% by volume of an ethylene tetrafluoride resin.

As a result of evaluating the mechanical properties of the obtained resin-based composite sliding member, the tensile strength was about 22 MPa, and 20
It was equivalent to an ethylene tetrafluoride resin-based composite material containing a volume% of glass fiber. As a result of evaluating the sliding characteristics in water, the coefficient of dynamic friction was 0.1 or less, which was equivalent to that of the tetrafluoroethylene resin alone containing no filler.
Further, the amount of abrasion was very small, almost the same as that of the above tetrafluoroethylene resin alone, and about 1/15 of that of the 20% by volume glass fiber reinforced tetrafluoroethylene resin composite material.

Example 3 20% by volume of carbon fiber having an average cross-sectional diameter of 10 μm, 10% by volume of boron nitride particles having an average particle size of 10 μm and 70% by volume of ethylene tetrafluoride resin powder were mixed, and the mixture was filled in a mold. 10 mm x 120 mm at a pressure of 40 MPa
It was pressed into a shape of × 120 mm. Next, the pressure-molded body is heated at a temperature of 400 ° C. for 2 hours to fusion bond the tetrafluoroethylene resin powders to each other, and as shown in FIG. To obtain a resin-based composite sliding member containing the boron nitride particles in Example 1 and 70% by volume of an ethylene tetrafluoride resin.

As a result of evaluating the mechanical properties of the obtained resin-based composite sliding member, the tensile strength was about 20 MPa, and
It was equivalent to an ethylene tetrafluoride resin-based composite material containing a volume% of glass fiber. As a result of evaluating the sliding characteristics in water, the coefficient of kinetic friction was 0.1 or less, which was equivalent to a simple substance of tetrafluoroethylene resin containing no filler, and the above-mentioned 30% by volume glass fiber reinforced ethylene tetrafluoride was used. It was about 1/20 as compared with the resin-based composite material.

Example 4 15% by volume of carbon fiber having an average cross-sectional diameter of 10 μm, 5% by volume of molybdenum disulfide particles having an average particle size of 20 μm, and 80% by volume of tetrafluoroethylene resin powder were mixed, and the mixture was used as a mold. Fill, 10mm x 120 at 40MPa pressure
It was pressure molded into a shape of mm × 120 mm. Next, the pressure molded body is heated at a temperature of 400 ° C. for 2 hours to fusion bond the tetrafluoroethylene resin powders to each other, and as shown in FIG. A resin-based composite sliding member comprising the above molybdenum disulfide particles and 80% by volume of an ethylene tetrafluoride resin was obtained.

As a result of evaluating the mechanical properties of the obtained resin-based composite sliding member, the tensile strength was about 22 MPa, and 20
It was equivalent to an ethylene tetrafluoride resin-based composite material containing a volume% of glass fiber. As a result of evaluating the sliding characteristics in water, the coefficient of kinetic friction was 0.1 or less, which was equivalent to the tetrafluoroethylene resin alone containing no filler, and the 20 volume% glass fiber reinforced tetrafluoroethylene was used. It was about 1/15 of that of the resin-based composite material.

Example 5 15% by volume of carbon fiber having an average cross-sectional diameter of 10 μm, 5% by volume of tungsten disulfide particles having an average particle size of 20 μm and 80% by volume of tetrafluoroethylene resin powder were mixed, and the mixture was used as a mold. Fill and 10mm × 12 at 45MPa pressure
It was pressure molded into a shape of 0 mm × 120 mm. Next, the pressure molded body is heated at a temperature of 400 ° C. for 2 hours to fusion bond the tetrafluoroethylene resin powders to each other, and as shown in FIG. A resin-based composite sliding member comprising the above tungsten disulfide particles and 80% by volume of an ethylene tetrafluoride resin was obtained.

As a result of evaluating the mechanical properties of the obtained resin-based composite sliding member, the tensile strength was about 20 MPa.
It was equivalent to an ethylene tetrafluoride resin-based composite material containing a volume% of glass fiber. As a result of evaluating the sliding characteristics in water, the coefficient of kinetic friction was 0.1 or less, which was equivalent to the tetrafluoroethylene resin alone containing no filler, and the 20 volume% glass fiber reinforced tetrafluoroethylene was used. It was about 1/15 of that of the resin-based composite material.

Example 6 15% by volume of carbon fiber having an average cross-sectional diameter of 10 μm, 5% by volume of graphite particles having an average particle size of 20 μm, and 80% by volume of ethylene tetrafluoride resin powder were mixed. A porous intermediate layer 5 having a thickness of 2 mm is previously formed on a base metal 4 having a thickness of 5 mm. The base metal 4 on which the porous intermediate layer 5 is formed is placed in a mold, the mixture is filled in the mold, and pressure molding is performed at a pressure of 40 MPa to form the sliding layer 6 and the porous intermediate layer. 5 and base metal 4 have an overall shape of 10 mm x 120 mm x 120 mm
A laminated body of was obtained. Next, the laminated body is heated at a temperature of 380 ° C. for 2 hours to fusion bond the tetrafluoroethylene resin powders to each other, and as shown in FIG. A resin-based composite sliding member having a sliding layer of tungsten sulfide particles and 80% by volume of an ethylene tetrafluoride resin was obtained.

As a result of evaluating the sliding characteristics of the obtained resin-based composite sliding member in water, the coefficient of kinetic friction was 0.1 or less, which was equivalent to a tetrafluoroethylene resin alone containing no filler, It was about 1/15 as compared with the 20 volume% glass fiber reinforced tetrafluoroethylene resin-based composite material.

[0035]

As described above, according to the present invention, a resin-based composite sliding member that is in sliding contact with a member that rotates or reciprocates in water has self-lubricating properties in a tetrafluoroethylene resin matrix. Since a composite material containing a fibrous filler or a filler on particles is used,
It is possible to obtain a resin-based composite sliding member having high strength, low friction coefficient, excellent sliding performance, and further excellent wear resistance.

[Brief description of drawings]

FIG. 1 is a sectional view schematically showing a configuration of a resin-based composite sliding member according to a first embodiment of the present invention.

FIG. 2 is a sectional view schematically showing a configuration of a resin-based composite sliding member according to a second embodiment of the present invention.

FIG. 3 is a sectional view schematically showing a configuration of a resin-based composite sliding member according to a third embodiment of the present invention.

[Explanation of symbols]

1 ... Tetrafluoride ethylene resin, 2 ... Fibrous filler, 3 ... Particulate filler, 4 ... Base metal, 5 ... Porous intermediate layer, 6 ... Sliding layer.

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) C08L 27/18 C08L 27/18 F16C 17/14 F16C 17/14 // B29K 27:18 B29K 27:18 105 : 16 105: 16 B29L 31:16 B29L 31:16 F-term (reference) 3J011 DA01 DA02 QA04 QA05 SA05 SC05 SE04 SE05 SE06 SE07 4F071 AA27 AB03 AB23 AB27 AD01 AD02 AE11 AE17 AF27 AG28 AG36 AH18 BB03 BC10 BC17 4F16 AB17 AB18 AB16 AB18 AB25 AH05 AH17 4F213 AA17 AB11 AB16 AB18 AB25 AC04 WA04 WA34 WA55 WB01 WB11 WB21 WE02 WE16 WF06 WF21 WK01 WK03 WW06 WW15 WW21 4J002 BD151 DA016 DA026 DG026 DK006 FA046 FA096 GM05

Claims (9)

[Claims] 1. In a resin-based composite sliding member that makes sliding contact with a member that rotates or reciprocates in water, it is preferable to use a composite material containing a self-lubricating filler in a tetrafluoroethylene resin matrix. Characteristic resin-based composite sliding member. 2. A resin-based composite sliding member, which is in sliding contact with a member that rotates or reciprocates in water, contains a self-lubricating filler in a tetrafluoroethylene resin matrix, and has a hardness of the filler. Is equal to or less than the hardness of the mating member facing and in contact with the sliding surface of the sliding member. 3. A resin-based composite sliding member that is in sliding contact with a member that rotates or reciprocates in water, wherein carbon fiber, graphite,
A resin-based composite sliding member comprising a composite material containing at least one kind of filler selected from boron nitride, molybdenum disulfide, and tungsten disulfide. 4. The resin-based composite sliding member according to claim 1, wherein the volume ratio of the filler in the resin-based composite sliding member is in the range of 2.5% to 30%. 5. The filler has an average cross-sectional diameter of 0.1 μm to
500 μm fibrous filler, or average particle size
The resin-based composite sliding member according to claim 1, wherein the resin-based composite sliding member is a particulate filler in the range of 0.1 μm to 500 μm. 6. A tetrafluoroethylene resin matrix containing any one of particulate fillers selected from carbon fibers, graphite particles, boron nitride particles, molybdenum disulfide particles, and tungsten disulfide particles, The resin-based composite sliding member according to claim 1 or 2, wherein the total volume ratio of the fillers is in the range of 5% to 30%. 7. A tetrafluoroethylene resin powder serving as a matrix and a filler are mixed, the mixture is pressure-molded, and then heated to form a composite by fusion treatment of the tetrafluoroethylene resin powder. A method of manufacturing a resin-based composite sliding member, comprising: 8. A tetrafluoroethylene resin powder serving as a matrix is mixed with the filler, and the mixture is pressed to impregnate the voids of the porous intermediate layer formed on the base metal, and the mixture is pressed. After molding and providing a sliding layer on the upper part of the porous intermediate layer, heating is performed to perform fusion treatment of the tetrafluoroethylene resin powder to form a composite, which is a resin-based composite sliding member. Production method. 9. A tetrafluoroethylene resin powder serving as a matrix is mixed with a filler, the mixture is pressure-molded and then heated to subject the tetrafluoroethylene resin powder to a fusion treatment to obtain a filler volume ratio. Of the resin composite sliding member is made to be in the range of 2.5% to 30%.