JP4252864B2 - Underwater sliding member and manufacturing method thereof - Google Patents

Description

  The present invention relates to an underwater sliding member suitable for use in bearings, sliding plates, thrust washers, and the like, and a method for manufacturing the same.

Conventionally, an underwater bearing made of a phenol resin using a cotton cloth as a reinforcing base material is well known. However, sufficient performance could not be obtained when used in an environment with a high foreign matter concentration such as earth and sand. Further, when used for a pump or the like, the operation is performed under dry conditions although it is a short time at the time of starting. However, the conventional underwater bearing made of a phenol resin using a cotton cloth as a reinforcing base has a problem that it is worn out and has a short life when used under dry conditions.
Japanese Patent Publication No.53-7565

  The present invention has been made in view of the above circumstances, and its purpose is to have sufficient wear resistance even in an environment where the concentration of foreign matter is high, and also to have sufficient wear resistance even under conditions of dry operation at start-up. An object is to provide an underwater sliding member and a method of manufacturing the same.

  As a result of intensive studies to achieve the above object, the present inventors can achieve the above object by forming a sliding layer using a carbon fiber cloth containing a specific phenol resin composition. I got the knowledge.

  The present invention has been completed on the basis of the above findings, and the first gist thereof is a phenol comprising 5 to 40% by weight of one or more ceramic fillers selected from ceramic particles and ceramic fibers and the balance phenol resin. It exists in the sliding member for water which consists of a laminated body of the carbon fiber cloth containing a resin composition. The laminate may be cylindrical or flat.

  The second gist of the present invention is that (i) a carbon fiber cloth is impregnated with a phenol resin composition comprising 5 to 40% by weight of one or more ceramic fillers selected from ceramic particles and ceramic fibers and the remainder phenol resin. A step of drying to produce a carbon fiber cloth prepreg, (b) a step of forming a cylindrical laminate by winding the carbon fiber cloth prepreg to a predetermined thickness while heating and pressing the core metal, and (c) the cylinder The present invention resides in a method for manufacturing a cylindrical underwater sliding member comprising a step of heat-curing a laminated body together with a core metal.

  The third gist of the present invention is that (i) a carbon fiber cloth is impregnated with a phenol resin composition comprising 5 to 40% by weight of one or more ceramic fillers selected from ceramic particles and ceramic fibers and the remainder phenol resin. A step of producing a carbon fiber cloth prepreg by drying and then cutting to a predetermined size, (b) a step of forming a flat laminate by laminating a predetermined number of the carbon fiber cloth prepregs, and (c) the flat laminate. The present invention resides in a method for producing a flat underwater sliding member comprising a step of heat-curing while pressing a body.

  A fourth gist of the present invention is a carbon fiber cloth containing a phenol resin composition comprising 5 to 40% by weight of one or more ceramic fillers selected from ceramic particles and ceramic fibers and the remainder phenol resin, or The sliding layer which consists of two or more layers exists in the underwater sliding member integrally joined to the lamination | stacking reinforcement layer of the glass fiber cloth containing a thermosetting synthetic resin. At this time, a configuration in which the sliding layer is integrally joined to the inner peripheral surface of the cylindrical laminated reinforcing layer, or a configuration in which the sliding layer is integrally joined to the flat laminated reinforcing layer can be adopted.

  The fifth gist of the present invention is that (i) a carbon fiber cloth is impregnated with a phenol resin composition comprising 5 to 40% by weight of one or more ceramic fillers selected from ceramic particles and ceramic fibers and the remainder phenol resin. A step of producing a carbon fiber cloth prepreg by drying, (b) a step of forming a sliding layer by winding one or more layers of the carbon fiber cloth prepreg while heating and pressurizing the core metal, and (c) the sliding A step of forming a cylindrical laminated body composed of a sliding layer and a laminated reinforcing layer by winding a glass fiber cloth prepreg containing a thermosetting synthetic resin on the outer periphery of the dynamic layer to a predetermined thickness while heating and pressing; ) The present invention resides in a method for producing a cylindrical underwater sliding member comprising a step of heat-curing the cylindrical laminate together with a cored bar.

  The sixth aspect of the present invention is to impregnate a carbon fiber cloth with a phenol resin composition comprising 5 to 40% by weight of one or more ceramic fillers selected from ceramic particles and ceramic fibers and the remainder phenol resin. A process of producing a carbon fiber cloth prepreg by drying to a predetermined size after drying, and (b) cutting a glass fiber cloth prepreg containing a thermosetting synthetic resin into a predetermined size and overlapping a predetermined number of sheets, A flat plate-like underwater slide comprising: a step of forming one or more carbon fiber cloth prepregs to form a flat laminate, and (c) a step of heat-curing the flat laminate while applying pressure. It exists in the manufacturing method of a moving member.

  The present invention will be described below. First, the carbon fiber cloth will be described. A conventionally known two-dimensional fabric can be used as the carbon fiber cloth used in the present invention. As the form of the woven fabric, a plain weave, a diagonal weave, a satin weave, a basket weave, and the like are used. Among these, a plain weave and a basket weave are preferable in terms of resin impregnation. Specifically, “Kureka Cloth (trade name)” manufactured by Kureha Chemical Industry Co., Ltd. “Toray Cloth (trade name)” manufactured by Toray Industries, Inc., “Beth Fight Cloth (trade name)” manufactured by Toho Rayon Co., Ltd. and the like can be mentioned.

  The phenolic resin may be either a resol type or a novolac type, but a resol type phenolic resin that can be cured only by heating is preferable from the viewpoint of handling at the time of preparing a prepreg. Specifically, “Resitop (trade name)” manufactured by Gunei Chemical Industry Co., Ltd., “Shonol (trade name)” manufactured by Showa Polymer Co., Ltd. and the like can be mentioned.

  The ceramic filler is blended with a phenol resin and plays a role of improving wear resistance, and ceramic particles and ceramic fibers having a Mohs hardness of 7 or more are preferably used. Specifically, aluminum borate (Mohs hardness 7 to 7.5), titanium oxide (Mohs hardness 7 to 7.5), silicon nitride (Mohs hardness 9), silicon carbide (Mohs hardness 9), alumina (Mohs hardness) And particles such as 9). As the ceramic particles, those having an average particle diameter of 10 μm or less, especially 5 μm or less are preferably used. The ceramic fiber is called a so-called whisker or short fiber having an average fiber diameter of 0.1 to 10 μm, an average fiber length of 5 to 500 μm, especially an average fiber diameter of 0.1 to 5 μm and an average fiber length of 5 to 100 μm. Those are preferably used. For example, “Ultradensic DU (trade name)” (silicon carbide particles) manufactured by Showa Denko KK, “Toka Whisker (trade name)” (silicon carbide whisker) manufactured by Tokai Carbon Co., “Arbolex (product) manufactured by Shikoku Kasei Kogyo Co., Ltd. Name) ”(aluminum borate whisker),“ Arbolite (trade name) ”(aluminum borate particles) manufactured by Shikoku Kasei Kogyo Co., Ltd., and the like.

  The blending ratio of the ceramic filler in the phenol resin composition comprising the ceramic filler and the phenol resin is 5 to 40% by weight, preferably 10 to 35% by weight when both ceramic particles and ceramic fibers are used as the ceramic filler. More preferably, it is 20 to 30% by weight. When the blending ratio is less than 5% by weight, the effect of blending does not appear, and when blending over 40% by weight, the bonding strength between the carbon fiber cloths is lowered and the strength as the sliding member becomes insufficient. . However, the blending ratio of ceramic fibers is within the range of blending ratio when only ceramic fibers described later are used. When only ceramic particles are used as the ceramic filler, the blending ratio is 5 to 40% by weight, preferably 10 to 30% by weight, and more preferably 15 to 25% by weight. Similarly to the above, when the blending ratio is less than 5% by weight, the blending effect does not appear, and when the blending ratio exceeds 40% by weight, the bonding strength between the carbon fiber cloths decreases and the strength as the sliding member is insufficient. End up. When only ceramic fibers are used as the ceramic filler, the ceramic fibers have a smaller bulk density than the ceramic particles. Therefore, considering the operability when manufacturing the carbon fiber cloth prepreg described later, it is impossible to mix much. Since the effect of improving the wear resistance is exhibited by blending a smaller amount than the ceramic particles due to the shape effect, the blending ratio is 5 to 25% by weight, preferably 5 to 20% by weight, more preferably 5 to 15% by weight. It is.

  The phenol resin composition comprising the ceramic filler and the phenol resin is further selected from graphite, tetrafluoroethylene resin, boron nitride, and carbonized phenol resin, particularly for the purpose of reducing the coefficient of friction during dry operation. One or more lubricity-imparting agents can be blended.

  The graphite is not particularly limited, but natural graphite such as scaly graphite, scaly graphite, and earthy graphite is preferable.

  As the tetrafluoroethylene resin, a tetrafluoroethylene resin for lubrication is preferable. Specifically, “TLP-10 (trade name)” manufactured by Mitsui DuPont Fluorochemical Co., Ltd., “Lublon L-5 (commercial product) manufactured by Daikin Industries Name) "," KTL-8N (trade name) "manufactured by Kitamura, and the like.

  The carbonized phenolic resin is a carbonized granular phenol / formaldehyde resin that is carbonized by high-temperature firing at 400 to 2200 ° C. in an inert atmosphere. When the purpose is to reduce the friction coefficient during dry operation, the carbonized phenol resin is 2000 ° C. or higher. What was baked at high temperature with is preferable. Specifically, “Bellepearl C-2000 (trade name)” manufactured by Kanebo Corporation may be mentioned.

  The blending ratio of these lubricity-imparting agents in the phenol resin composition is 5 to 20% by weight. At this time, it is important that the total amount with the ceramic filler is 40% by weight or less. When the blending ratio of the solid lubricant is less than 5% by weight, the blending effect does not appear. When the blending ratio exceeds 20% by weight, the wear resistance is lowered. And when the sum total with a ceramic filler exceeds 40 weight%, the coupling | bonding force of carbon fiber cloth will fall, and the intensity | strength as a sliding member will become inadequate.

  The phenol resin composition consisting of the above phenol resin and ceramic filler or the phenol resin, ceramic filler and lubricity imparting agent is contained in the carbon fiber cloth, but the mixing ratio of the phenol resin composition and the carbon fiber cloth is The ratio of phenol resin composition: carbon fiber cloth = 80: 20 to 60:40. When the blending ratio of the phenol resin composition is larger than the above ratio, the wear resistance is insufficient, and when it is small, the bonding strength between the carbon fiber cloths is lowered.

  As the glass fiber cloth used for the laminated reinforcing layer, conventionally known ones are used, and as the thermosetting synthetic resin contained in the glass fiber cloth, phenol resin, epoxy resin, unsaturated polyester resin, etc. are used. The And as for the mixture ratio of this thermosetting synthetic resin and glass fiber cloth, thermosetting synthetic resin: glass fiber cloth = 40: 60-60: 40 is preferable. When the blending ratio of the thermosetting synthetic resin is larger than the above ratio, the strength as the reinforcing layer is insufficient, and when the blending ratio is small, the bonding strength between the glass fiber cloths is lowered and the production becomes difficult.

  Below, the manufacturing method of the sliding member which consists of the structure mentioned above is demonstrated.

  First, at least one ceramic filler selected from ceramic particles and ceramic fibers, or at least one lubricity imparting agent selected from ceramic filler, graphite, tetrafluoroethylene resin, boron nitride, and carbonized phenol resin Is mixed with a phenol resin varnish, and if necessary, a solvent is further added and mixed to prepare an impregnating solution having a solid content of 50 to 70% by weight.

  Next, the impregnating liquid is impregnated into a carbon fiber cloth as a base material to produce a carbon fiber cloth prepreg as a molding material. An example of the manufacturing method is shown in FIG. In the figure, the carbon fiber cloth 1 which is a base material wound around a roller 5 is drawn out and immersed in the impregnating liquid 2, and then the solvent is blown off through a drying furnace 3 to be dried in a semi-cured state. A carbon fiber cloth prepreg 4 as a molding material thus obtained is wound around a roller 6.

  In order to manufacture a cylindrical sliding member (bearing bush) using the obtained carbon fiber cloth prepreg, a rolled molding method is applied. In the rolled forming method, three rollers are arranged in parallel so as to form a triangle when viewed from the roller end face, and a core metal is arranged so as to be sandwiched between the three rollers, and a prepreg is wound around the core metal. In this method, the cored bar is driven and rotated in a certain direction, and each roller in contact with the cored bar is rotated so as to follow the cored bar, thereby forming a laminated tube. An outline of the rolled forming method is shown in FIG. The carbon fiber cloth prepreg 4 obtained in FIG. 1 is heated by a pressure roller 8 through a heating roller 9 and a cooling roller 10 that are preheated to 80 to 100 ° C. from a roller 6 and 2 to 2.5 kgf / mm (line A cylindrical laminated body is manufactured by continuously winding a cored bar 7 preliminarily heated to 100 to 110 ° C. to a desired diameter while pressurizing at a predetermined pressure.

  The obtained cylindrical laminate is put together with a cored bar in a heating furnace prepared in an atmosphere of 120 to 180 ° C. to perform a curing process. This heat-curing treatment is generally performed without applying pressure, but may be performed while applying pressure as necessary. After completion of the curing process, the core is removed by cooling to obtain a cylindrical molded product. The cylindrical molded product thus obtained is cut into an appropriate length according to the application, and the inner and outer diameter surfaces and the end surface are cut to form a laminate of a carbon fiber cloth containing a phenol resin composition. A cylindrical sliding member is obtained.

  When a laminated reinforcing layer made of glass fiber cloth containing a thermosetting synthetic resin is provided on the outer peripheral side, as shown in FIG. 3, first, one or more layers of carbon fiber cloth prepreg are wound around the core metal 7 A dynamic layer 11 is formed, and a glass fiber cloth prepreg 13 obtained by the same method as that of the carbon fiber cloth prepreg is wound around the outside to form a laminated reinforcing layer 12. The cylindrical laminate thus obtained is heat-cured and then cut to have a sliding layer made of a carbon fiber cloth containing a phenolic resin composition on the inner peripheral surface and thermosetting on the outer peripheral side. A cylindrical sliding member having a laminated reinforcing layer of glass fiber cloth containing a synthetic resin can be obtained.

When producing a flat sliding member (sliding plate), as shown in FIG. 4, the carbon fiber cloth prepreg is cut into various shapes according to the shape of the molded product, and the obtained plate-like carbon fiber cloth is obtained. The required number of prepregs 21 are stacked, and pressure heating molding is performed at a temperature of 120 to 180 ° C. and a pressure of 20 to 40 kgf / cm ² .

  When manufacturing a sliding plate having a laminated reinforcing layer made of glass fiber cloth containing a thermosetting synthetic resin, a necessary number of glass fiber cloth prepregs cut to a desired size are stacked, and then cut to the same size. A necessary number of carbon fiber cloth prepregs may be stacked, and this may be pressure-heat-molded.

  According to the underwater sliding member described in claim 1 of the present invention, since the surface hardness of the sliding surface is improved by using the carbon fiber cloth, the wear resistance is enhanced. In addition, since the water absorption resistance is improved, the sliding member can be prevented from swelling when used in water, and dimensional change due to swelling, hugging to a counterpart material, and further seizure can be prevented. Furthermore, since the thermal conductivity is improved, it is more effective in preventing seizure. In addition, since the carbon fiber cloth includes a phenol resin composition composed of 5 to 40% by weight of one or more ceramic fillers selected from ceramic particles and ceramic fibers and the remainder phenol resin composition, It has sufficient abrasion resistance even in high water and exhibits sufficient abrasion resistance even in dry conditions.

  Here, by using a ceramic filler having a Mohs hardness of 7 or more, the wear resistance can be further improved. Further, in addition to the ceramic filler, by blending 5 to 20% by weight of one or more lubricity imparting agents selected from graphite, tetrafluoroethylene resin, boron nitride, and carbonized phenol resin, The sliding characteristics can be improved under dry conditions.

  When the blending ratio of the phenol resin composition and the carbon fiber cloth is set to the weight ratio of phenol resin composition: carbon fiber cloth = 80: 20 to 60:40, the bonding strength between the laminated carbon fiber cloths is improved.

  According to the manufacturing method of the seventh aspect of the present invention, a cylindrical underwater sliding member can be obtained, and since a rolled molding method is used, a large-diameter sliding member can be easily obtained. .

  According to the manufacturing method of claim 8 of the present invention, a flat underwater sliding member is obtained.

  According to the underwater sliding member described in claim 12 of the present invention, only the sliding layer important for the sliding characteristics is composed of the carbon fiber cloth containing the phenol resin composition, and the rest of the sliding layer is heated. Since it comprised with the glass fiber cloth containing curable synthetic resin, compared with the case where only a carbon fiber cloth is used, while the intensity | strength of the whole sliding member improves, a dimensional change amount is further suppressed low.

  According to the manufacturing method of claim 18 of the present invention, a cylindrical underwater sliding member is obtained in which the sliding layer is integrally joined to the inner peripheral surface of the cylindrical laminated reinforcing layer.

  According to the manufacturing method of the nineteenth aspect of the present invention, there can be obtained a flat plate-like underwater sliding member in which a sliding layer is integrally joined on a flat plate-like laminated reinforcing layer.

  EXAMPLES Hereinafter, although an Example demonstrates this invention in detail, this invention is not limited to a following example, unless the summary is exceeded.

<Examples 1-12, Comparative Examples 1-3>
The solid content of the phenol resin varnish (“Resitop PL-4222 (trade name)” manufactured by Gunei Chemical Industry Co., Ltd.), a ceramic filler, and a lubricity imparting agent having a solid content concentration of 62% by weight is shown in Tables 1 to 3 and 5. It mixed so that it might become the composition shown, and methanol was added to this liquid mixture, and the impregnation liquid whose solid content concentration is 60 weight% was prepared. After impregnating the carbon fiber cloth with the impregnation liquid using the apparatus shown in FIG. 1, the solvent is blown through a drying furnace whose atmosphere is adjusted to 110 to 140 ° C., and the phenol resin composition comprising the phenol resin and the filler is impregnated. A carbon fiber cloth prepreg was produced.

  Using this carbon fiber cloth prepreg, roll forming is performed by the apparatus shown in FIG. 2, and the obtained cylindrical laminate is put together with a cored bar in a heating furnace whose atmosphere is adjusted to 120 to 180 ° C. for about 12 hours. After caulking, the metal core was removed by cooling and machined to obtain a cylindrical sliding member having an inner diameter of 60 mm, an outer diameter of 75 mm, and a length of 60 mm.

<Examples 13 to 16>
A carbon fiber cloth prepreg containing a phenol resin composition having a solid composition as shown in Table 4 was produced in the same manner as in the above-described Examples.

  Using the apparatus shown in FIG. 2, first, a glass fiber cloth prepreg is wound around a metal core to a predetermined thickness to form a sliding layer, and the outer periphery is impregnated with 50% by weight of epoxy resin. A fiber cloth prepreg was wound to obtain a cylindrical laminate. The obtained cylindrical laminated body was put together with a cored bar in a heating furnace whose atmosphere was adjusted to 120 to 180 ° C. and heat-cured for about 12 hours, then cooled and extracted, and machined to have an inner diameter of 60 mm, A cylindrical sliding member having an outer diameter of 75 mm, a length of 60 mm, a sliding layer thickness of 2.5 mm, and a laminated reinforcing layer thickness of 5 mm was obtained.

<Comparative example 4>
A phenol resin varnish (“Resitop PL-4222 (trade name)” manufactured by Gunei Chemical Industry Co., Ltd.) having a solid content concentration of 62% by weight and a solid lubricant were mixed so that the solid content composition was as shown in Table 5. A 4 mm square piece of cotton cloth was added to this and sufficiently stirred and mixed to impregnate the cotton resin fine cloth with the phenol resin composition, heated to remove the solvent and dried to a predetermined degree of condensation. The product thus obtained was placed in a mold as a molding material and heated and pressed to obtain a cylindrical sliding member having an inner diameter of 60 mm, an outer diameter of 75 mm, and a length of 60 mm.

  In the table, the proportion of each component of the phenol resin composition is wt%, and the blending ratio of the phenol resin composition and the carbon fiber cloth is a weight ratio. Silicon carbide particles having an average particle diameter of 0.5 μm, silicon nitride particles having an average particle diameter of 1 μm, aluminum borate particles having an average particle diameter of 8 μm, and silicon carbide whiskers having an average diameter of 0 μm. A fiber having an average diameter of 5 μm and an average length of 200 μm was used as an alumina short fiber.

  The cylindrical sliding members produced in Examples 1 to 16 and Comparative Examples 1 to 4 described above were subjected to a cumulative load test in water where foreign substances existed under the conditions shown in Table 6. Tables 7 to 11 show the friction coefficient at each load and the wear amount after the test. The coefficient of friction indicates the value immediately before the end of each load, and the amount of wear is indicated by the dimensional change of the sliding member.

  From the above results, all the sliding members according to the present invention showed good sliding characteristics. In particular, the amount of wear is small. In contrast, the sliding member of the comparative example had a large amount of wear although the coefficient of friction was not much different from that of the sliding member of the present invention.

  Moreover, in order to investigate the performance in dry conditions, it evaluated on the conditions shown in Table 12. The results are shown in Tables 13-17. The coefficient of friction indicates the coefficient of friction after stabilization 3 minutes after the start of the test, and the amount of wear is indicated by the dimensional change of the sliding member after the end of the test.

  From the above results, the sliding member according to the present invention showed good sliding characteristics even under dry conditions. On the other hand, the sliding member of the comparative example had a large amount of wear, although the friction coefficient was not much different from that of the sliding member of the present invention, as in the above-described test in the presence of foreign matter.

It is a figure which shows an example of the manufacturing method of the prepreg of this invention. It is explanatory drawing of the rolled shaping | molding method which manufactures the cylindrical sliding member of this invention. It is explanatory drawing of the sliding member which has a sliding layer in the internal peripheral surface of the cylindrical laminated reinforcement layer of this invention. It is explanatory drawing of the flat sliding member of this invention.

Explanation of symbols

4 Molding material (carbon fiber cloth prepreg)
7 Core Bar 8 Pressure Roller 9 Heating Roller 10 Cooling Roller 11 Sliding Layer 12 Laminated Reinforcement Layer

Claims (22)

  An underwater slide comprising a laminate of a carbon fiber cloth containing 5 to 40% by weight of one or more ceramic fillers selected from ceramic particles and ceramic fibers and a phenol resin composition comprising the remainder phenol resin. Moving member.   The underwater sliding member according to claim 1, wherein the ceramic filler has a Mohs hardness of 7 or more.   The phenol resin composition further contains 5 to 20% by weight of one or more lubricity imparting agents selected from graphite, tetrafluoroethylene resin, boron nitride, and carbonized phenol resin. Underwater sliding member.   The underwater sliding member according to any one of claims 1 to 3, wherein the laminate is cylindrical.   The underwater sliding member according to any one of claims 1 to 3, wherein the laminate has a flat plate shape.   The underwater slide according to any one of claims 1 to 5, wherein a mixing ratio of the phenol resin composition and the carbon fiber cloth is phenol resin composition: carbon fiber cloth = 80: 20 to 60:40 by weight ratio. Moving member. (A) A carbon fiber cloth prepreg is produced by impregnating a carbon fiber cloth with 5 to 40% by weight of one or more ceramic fillers selected from ceramic particles and ceramic fibers and the remainder phenol resin, and drying. The process of
(B) a step of forming a cylindrical laminate by winding the carbon fiber cloth prepreg to a predetermined thickness while heating and pressing the core metal;
(C) a step of heat-curing the cylindrical laminate together with the core;
A method for producing a cylindrical underwater sliding member, comprising: (B) A carbon fiber cloth is impregnated with 5 to 40% by weight of one or more ceramic fillers selected from ceramic particles and ceramic fibers and the remaining phenol resin is impregnated and dried, and then cut into predetermined dimensions. Manufacturing the carbon fiber cloth prepreg
(B) a step of superposing a predetermined number of the carbon fiber cloth prepregs to form a flat laminate,
(C) a step of heat-curing while pressing the flat laminate,
A method for producing a flat-plate underwater sliding member, comprising:   The method for producing an underwater sliding member according to claim 7 or 8, wherein the ceramic filler has a Mohs hardness of 7 or more.   The phenol resin composition further contains 5 to 20% by weight of one or more lubricity-imparting agents selected from graphite, tetrafluoroethylene resin, boron nitride, and carbonized phenol resin. The method for producing an underwater sliding member according to one item.   The mixing ratio of a phenol resin composition and a carbon fiber cloth is phenol resin composition: carbon fiber cloth = 80: 20-60: 40 by weight ratio, The underwater slide as described in any one of Claims 7-10. Manufacturing method of moving member.   A sliding layer composed of one or more layers of carbon fiber cloth containing a phenol resin composition composed of 5 to 40% by weight of one or more ceramic fillers selected from ceramic particles and ceramic fibers and the remainder phenol resin. An underwater sliding member characterized by being integrally joined to a laminated reinforcing layer of a glass fiber cloth containing a thermosetting synthetic resin.   The underwater sliding member according to claim 12, wherein the ceramic filler has a Mohs hardness of 7 or more.   The phenol resin composition further contains 5 to 20% by weight of at least one lubricity-imparting agent selected from graphite, tetrafluoroethylene resin, boron nitride, and carbonized phenol resin. Underwater sliding member.   The underwater sliding member according to any one of claims 12 to 14, wherein a sliding layer is integrally joined to an inner peripheral surface of the cylindrical laminated reinforcing layer.   The underwater sliding member according to any one of claims 12 to 14, wherein the sliding layer is integrally joined on the flat laminated reinforcing layer.   The mixing ratio of a phenol resin composition and a carbon fiber cloth is phenol resin composition: carbon fiber cloth = 80: 20-60: 40 by weight ratio, The underwater slide as described in any one of Claims 12-16 Moving member. (A) A carbon fiber cloth prepreg is produced by impregnating a carbon fiber cloth with 5 to 40% by weight of one or more ceramic fillers selected from ceramic particles and ceramic fibers and the remainder phenol resin, and drying. The process of
(B) A step of forming a sliding layer by winding the carbon fiber cloth prepreg on a cored bar while heating and pressing one or more layers,
(C) A glass fiber cloth prepreg containing a thermosetting synthetic resin is wound around the outer periphery of the sliding layer while being heated and pressurized to a predetermined thickness to form a cylindrical laminate composed of a sliding layer and a laminated reinforcing layer. The process of
(D) a step of heat-curing the cylindrical laminate together with a cored bar,
A method for producing a cylindrical underwater sliding member, comprising: (B) A carbon fiber cloth is impregnated with 5 to 40% by weight of one or more ceramic fillers selected from ceramic particles and ceramic fibers and the remaining phenol resin is impregnated and dried, and then cut into predetermined dimensions. Manufacturing the carbon fiber cloth prepreg
(B) A glass fiber cloth prepreg containing a thermosetting synthetic resin is cut into a predetermined size and a predetermined number of sheets are stacked, and one or more carbon fiber cloth prepregs are stacked thereon to form a flat laminate. Forming a process,
(C) a step of heat-curing while pressing the flat laminate,
A method for producing a flat-plate underwater sliding member, comprising:   The method for producing an underwater sliding member according to claim 18 or 19, wherein the ceramic filler has a Mohs hardness of 7 or more.   The phenol resin composition further contains 5 to 20% by weight of one or more lubricity-imparting agents selected from graphite, tetrafluoroethylene resin, boron nitride, and carbonized phenol resin. The method for producing an underwater sliding member according to one item.   The underwater slide according to any one of claims 18 to 21, wherein a mixing ratio of the phenol resin composition and the carbon fiber cloth is phenol resin composition: carbon fiber cloth = 80: 20 to 60:40 by weight ratio. Manufacturing method of moving member.

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