JP2002323141A - Sliding part and manufacturing method therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce amount of abrasion in a sliding surface, while preventing oxidation in an atmosphere of high-temperature oxidation, particularly to reduce sliding resistance, even in boundary friction and dry friction at high temperature. SOLUTION: A layer, containing a mixed compound of silicon oxide and metallic phosphoric acid compound, is provided in pores on a sliding surface made of carbon material, to constitute a sliding part of a mechanical seal and a bearing.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sliding part made of carbon material for a mechanical seal and a bearing and having an improved oxidation-resistant sliding surface, and a method of manufacturing the same.
In particular, the present invention relates to a sliding component that prevents abrasion of a sliding surface where it is difficult to form a fluid lubricating film in a boundary friction state or a dry friction state, and a technical field of a manufacturing method thereof.

[0002] On pages 44 to 45 of the monthly magazine "Maintenance" issued in June 1992, general descriptions of examples of application of mechanical seals for LNG turbines and Freon turbines to industrial machines are described. . The seal ring made of a sliding material for these mechanical seals uses high-strength, hard, non-impregnated carbon for oil as heat resistance. Lubricating oil must be constantly supplied to the sliding surfaces of these mechanical seal seal rings. Therefore, it is difficult to use the sliding surface of the dry seal ring.

Generally, carbon materials are oxidized in a high-temperature oxidizing atmosphere of 500 ° C. or higher. Further, the fluid lubricating film is not formed on the sliding surface in a boundary friction state or a dry friction state. For this reason, it is difficult to use the sliding surface for a long period of time without special treatment. This causes the same problem not only in the sliding parts of the mechanical seal but also in the sliding parts for bearings used in a high temperature state.

Further, under lubrication in high-temperature water, even when lubricating liquid is present between the sliding surfaces of the sliding parts, the lubricating oil is boiled and evaporated by the action of sliding heat and the like, and evaporates. Reach. Then, the sliding surfaces slide with the sliding surfaces in direct contact with each other due to the vaporization of the interposed lubricating fluid.
In such a state of boundary friction between sliding surfaces due to direct contact or in a state of dry friction, intense friction, wear, and high heat generation occur. Due to the severe wear and high heat generation, the sliding surface is damaged. In such a state, for example, taking a mechanical seal as an example, the fluid to be sealed leaks between the sealing surfaces in a short time. In addition, the bearing may be cracked and damaged, leading to an accident.

On the other hand, in the case of a carbon material, fine pores are generated during the manufacturing process. These pores serve as a moving path of an oxidizing agent and a reaction product in the oxidation reaction, and the pore surface is oxidized and consumed in an oxidizing atmosphere of 500 ° C. or more. For this reason, it becomes difficult to use it stably for a long time.

Accordingly, the present applicant has previously disclosed in Japanese Patent Laid-Open No. 9-87.
No. 067 proposes an invention in which pores on a sliding surface of a carbon material are subjected to an oxidation resistance treatment. In this oxidation resistance treatment, a mixed compound film of a lithium compound and a phosphoric acid compound is formed in the pores of the carbon material. This oxidation-resistant carbon material has made it possible to improve the oxidation resistance without sacrificing the lubricating properties, but is expected to reduce the coefficient of friction and the amount of wear of the sliding surface during dry friction. Absent. Further, in a situation of boundary lubrication in which high-temperature water is present on a sliding surface or the like, reduction of sliding resistance cannot be expected. Moreover, in order to improve the oxidation resistance, it is necessary to form the film to a certain thickness. Further, it is necessary to form layers of various mixed compounds according to the setting, but this oxidation-resistant carbon material does not consider this production method.

[0007]

As described above, in the case of a high-strength, hard non-impregnated carbon material for a high-temperature sealed fluid, lubricating oil must be constantly supplied to the sliding material. There is a problem to be solved. In addition, the effective sealing temperature of the sliding material against the sealing surface is limited to about 300 ° C.

[0008] Furthermore, the oxidation-resistant carbon material impregnated with a conventional lithium compound can be expected to improve the oxidation resistance, but it is difficult to reduce the wear coefficient and the wear amount during dry friction with temperature. .

Furthermore, it is difficult to reduce the friction resistance under water lubrication or in a sliding condition of boundary friction in which high-temperature water is present on the sliding surface.

The present invention has been made in view of the above problems, and a technical problem to be solved is to impair the self-lubricating property and the oxidation resistance even at a high temperature. In other words, the present invention is to effectively prevent abrasion on a sliding surface in a high temperature state. Another object of the present invention is to provide a sliding part having a simple structure. Another object of the present invention is to provide a manufacturing method capable of simplifying the manufacturing process and producing at low cost.

[0011]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned technical problems, and the means for solving the problems is constituted as follows. .

According to the first aspect of the present invention, there is provided a sliding part for a mechanical seal according to the present invention, wherein the pores of a carbon material having pores on a sliding surface have a layer containing a mixed compound containing silicon oxide and a metal phosphate compound in the pores. Things.

In the sliding part for a mechanical seal according to the first aspect of the present invention, distribution such as temperature, pressure, thickness of a liquid layer, etc. is formed during sliding at each position on the sliding surface of the sliding part. Is done. And the distribution of temperature, pressure, liquid layer thickness, etc.
It changes with the elapsed time from the start of sliding. For this reason,
While sliding, the same sliding surface will continuously experience different forms of friction.

In this sliding state, the boundary friction state and the dry friction state, which are the objects of the present invention, coexist as the temperature changes. Exhibits abrasion. This is because when silicon oxide is formed on the sliding surface, extremely low friction is maintained under water lubrication. Then, in the boundary friction state in which the high-temperature water remains on the sliding surface, it is considered that silicon oxide is supplied to the sliding surface from the pores of the sliding surface to provide a low friction mechanism.

Furthermore, in a dry friction state in which the temperature rises to a higher temperature due to sliding heat generated on the sliding surface, the carbon abrasion powder moves to and adheres to the opposed sliding surface, thereby exhibiting low friction. It can be considered from the results of experiments. This may be due to the fact that the metal phosphate compound imparts oxidation resistance to the carbon wear powder to form a transfer film. Therefore, the action of the components of the layer containing silicon oxide and the metal phosphate compound, and furthermore, the co-action with the carbon powder imparted with acid resistance by the metal phosphate compound, causes a wide range of boundary friction and dry friction. It is recognized from the results of the experiment that the effect of low abrasion can be obtained.

According to a second aspect of the present invention, there is provided a sliding component for a mechanical seal according to the present invention, wherein the pores of a carbon material having pores on a sliding surface contain a mixed compound containing silicon oxide, a metal phosphate compound and a lithium compound. It has a layer.

In the sliding part for a mechanical seal according to the second aspect of the present invention, it is recognized that a similar effect can be obtained by a mixed compound of silicon oxide, a metal phosphate compound and a lithium compound. In particular, it is possible to increase the thickness of the containing layer by preventing the impregnation from being blown out in the process of forming the containing layer with the lithium compound on the carbon material. For this reason, the inclusion layer can be formed in one impregnation step without performing many impregnation step operations, and the effect of low abrasion is obtained by the inclusion layer.

According to a third aspect of the present invention, in the sliding part for a mechanical seal, the metal of the metal phosphate compound contains aluminum and / or zinc.

In the sliding component for a mechanical seal according to the third aspect of the present invention, when the metal of the metal phosphate compound contains aluminum and / or zinc, aluminum reduces the friction coefficient at high temperatures. In addition, zinc is excellent in oxidation resistance, and in both cases, it effectively imparts oxidation resistance to carbon abrasion powder in a high temperature state and transfers it to the opposing sliding surface that slides. A film is formed and a low friction sliding state is exhibited against a high temperature state.

According to a fourth aspect of the present invention, there is provided a sliding part for a mechanical seal, wherein the containing layers are formed in the order of a silicon oxide containing layer and an aluminum phosphate compound containing layer.

In the sliding part for a mechanical seal according to the present invention according to claim 4, since the containing layer is formed in the order of a silicon oxide-containing layer and an aluminum phosphate compound-containing layer, the boundary layer is in a state of boundary friction. , While the aluminum phosphate compound containing layer protects the silicon oxide containing layer,
It maintains low abrasion and exhibits low friction in a dry friction state.

According to a fifth aspect of the present invention, there is provided the sliding component for a mechanical seal according to the present invention, wherein the containing layers are formed in the order of a layer containing an aluminum phosphate compound and a layer containing silicon oxide.

In the sliding component for a mechanical seal according to the fifth aspect of the present invention, in a boundary friction state in which the temperature of the sliding surface is 100 ° C. or higher, the silicon oxide-containing layer formed in the pores is not formed. Supplied to the sliding surface, silicon oxide exerts a low friction state even in a boundary lubrication state. Then, when the layer containing the aluminum phosphate compound shifts to a dry friction state as the temperature increases, low friction at a high temperature is exhibited.

According to a sixth aspect of the present invention, there is provided a method of manufacturing a sliding part for a mechanical seal, wherein a sliding part having pores on a sliding surface is impregnated with a mixed solution of a silicon oxide particle dispersion and a metal phosphate compound solution. Or impregnated with a mixed solution of a silicon oxide particle dispersion, a metal phosphate compound solution and a lithium compound, and then heat-treated at a temperature in the range of 400 ° C. to 1300 ° C. to fill the pores on the sliding surface with the pores. It forms a dry containing layer of the mixed solution.

In the method for manufacturing a sliding part for a mechanical seal according to the present invention according to claim 6, the impregnated solution is dried at 400 ° C. to 1300 ° C. An impregnated layer that can be expected to have an effect can be formed. In particular, since the blowing out of the impregnated material in the heat treatment after the impregnation of the lithium compound can be suppressed, the depth of the containing layer can be increased without repeatedly impregnating. Therefore, the adjustment of the depth of the containing layer can be adjusted, and the working time can be shortened.

In the method for manufacturing a sliding part for a mechanical seal according to the present invention, the sliding part having pores on a sliding surface is impregnated with either a silicon oxide particle dispersion or a metal phosphate compound solution. Or impregnated with either one of a silicon oxide particle dispersion, or a mixed solution of a metal phosphate compound solution and a lithium compound, and then 400 °
A heat treatment at a temperature in the range of C to 1300 ° C. to form a dried primary containing layer of the impregnating liquid on the pores of the sliding surface, and then on the upper surface of the primary containing layer of the pores on the sliding surface. Impregnated with the other liquid, then from 400 ° C. to 1300
Heat treatment at a temperature in the range of ° C. to form a dried secondary containing layer of the other liquid.

In the method for manufacturing a sliding part for a mechanical seal according to the present invention, the pores of the carbon material having pores on the sliding surface are made of silicon oxide and / or a metal phosphate compound or a lithium compound. The mixed compounds contained are impregnated sequentially and after each impregnation 400 ° C. to 130 ° C.
When the heat treatment is performed at a temperature of 0 ° C., the desired containing layer can be formed by variously combining these two containing layers.
Then, it is possible to form the containing layer that enables the functions and effects as described in the fourth and fifth aspects. Further, the lithium compound can be expected to have the function and effect as described in claim 6.

The sliding component for bearing according to the present invention according to claim 8 has a layer containing a mixed compound containing silicon oxide and a metal phosphate compound in the pores of a carbon material having pores on a sliding surface.

The sliding component for a bearing according to the present invention according to the present invention, in a bearing of a device used at a high temperature such as a heat treatment furnace or a high temperature processing device, a boundary friction state and a dry friction state associated with a high temperature coexist. . At this time, the silicon oxide-containing layer exhibits wear resistance as well as oxidation resistance. This is because when silicon oxide is formed on the sliding surface, low friction is exerted on the sliding surface even in a boundary friction state. In the boundary friction state, silicon oxide is supplied to the sliding surface from the containing layer provided in the pores of the sliding surface.

Further, when the temperature further rises due to the high temperature state or the sliding surface heat generation, the state shifts to the dry friction state, so that the oxidation-resistant carbon abrasion powder moves and adheres to the opposing sliding surface. It is considered from the result of the experiment that it exerts low friction. This is also considered to be a factor in forming the containing layer to which the metal phosphate compound imparts oxidation resistance to the carbon wear powder. Therefore, it is recognized that the effect of abrasion resistance by the layer containing the silicon oxide and the metal phosphate compound and the low friction effect of the synergistic action of the metal phosphate compound with the carbon powder can be obtained.

According to a ninth aspect of the present invention, there is provided a sliding component for a bearing according to the present invention, wherein the pores of a carbon material having pores on a sliding surface contain a mixed compound containing silicon oxide, a metal phosphate compound and a lithium compound in the pores. It has.

According to a ninth aspect of the present invention, there is provided a sliding part for a bearing used in a device used at a high temperature, such as a heat treatment furnace or a gas turbine, in a bearing compound of a silicon oxide, a metal phosphate compound and a lithium compound. It can be recognized that the containing layer formed by the above provides the same function and effect as described in claims 1 and 2 in the bearing. In particular, the lithium compound has a good effect on imparting oxidation resistance to carbon powder and the like, and is expected to have an effect of simplifying the production process of the containing layer and facilitating quality control. The heat treatment temperature of 400 ° C. to 1300 ° C. described above is preferably 500 ° C. to 1200 ° C.
When it is set, the temperature becomes more preferable.

[0033]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a sliding component according to an embodiment of the present invention will be described in detail. In the present invention, when a carbon material is processed to form a sliding component, pores are formed on the sliding surface. These carbon materials are mixed with a fine powder of coke, carbon black, graphite or the like, added with a carbonizable binder such as tar or pitch, mixed, and then kneaded. °
A method is employed in which the binder is carbonized by firing at 1500 ° C. from C. Then, a carbonaceous carbon material, a graphitic carbon material, or the like is formed. These are 2500 ° C
To 3000 ° C. to change the whole into graphite. In addition, there is also a method of adjusting the fine pores to be smaller, after impregnating a carbonizable organic material such as a thermosetting synthetic resin, and then refiring to carbonize the organic material.
The formation of these pores having the optimum size can be easily performed by combining a molding method, a firing method, and the like in addition to the material components to be contained.

The sliding surface of a sliding part formed by processing and forming the same in this manner is impregnated with a mixed solution of a silicon oxide particle dispersion and a metal phosphate compound solution, or Solution, a mixed solution of a metal phosphate compound solution and a lithium compound and then impregnated at 400 ° C.
Heat treatment is performed at a temperature in the range of 300 ° C. to form a dry containing layer of the mixed solution in the pores of the sliding surface. Thus, the content layer of claim 6 is manufactured.

A sliding part having pores on its sliding surface is impregnated with either a silicon oxide particle dispersion or a metal phosphate compound solution, or a silicon oxide particle dispersion or a metal phosphate compound solution and Impregnating either one of the lithium compound mixed solution, and then
Heat treatment at a temperature in the range of 00 ° C. to dry the impregnating liquid in the pores of the sliding surface to form a primary containing layer, and then impregnate the upper surface of the primary containing layer of the pores in the sliding surface with the other liquid. And then 40
Heat treatment is performed at a temperature in the range of 0 ° C. to 1300 ° C. to dry the other liquid to form a secondary containing layer. In this way, the content layer of claim 7 is manufactured.

As a method of forming an impregnated layer in the pores of the sliding surface, there are an impregnation method, a coating method, and a method of mixing an impregnated layer component in a raw material stage before carbon molding.
Now, as an example, an example of the impregnation method is as follows. An impregnating agent of the compound solution is prepared, and the sliding parts are put into a container of an impregnating device capable of applying a vacuum, and the container is evacuated to a vacuum state. Next, the impregnating agent is charged into the container, and is kept in a pressurized state using nitrogen gas or the like for a certain time. Then, the sliding component is taken out of the impregnating device, washed with a washing device, and then dried by a drying device. Thereafter, the metal phosphate compound is heat-treated in an atmosphere at or above a temperature at which the metal phosphate compound is sufficiently densified by desorption of water of crystallization or the like.
The densification temperature varies depending on the compound, but in the case of the first aluminum phosphate, the treatment is performed at 400 ° C. or more.

By the containing layer formed in this manner, for example, when the temperature of the sliding surface is high and the humidity is high, for example,
It is intended to improve the oxidation resistance of the carbon material and to exhibit a low friction state at a temperature of 00 ° C. or higher.
These provide oxidation resistance to the sliding surface by a layer containing a mixed compound containing silicon oxide and a metal phosphate compound in pores formed on the sliding surface of the carbon material, and maintain low friction. .

The boundary frictional state and the dry frictional state progress in the sliding state accompanying the rise in temperature. In particular, even when the vapor in the atmosphere intervenes on the sliding surface, the oxidation of the containing layer occurs. Silicon and the metal phosphate compound cooperate to exert abrasion resistance on the carbon material. Furthermore, the silicon oxide maintains extremely low friction even when the sliding surface is under water lubrication. Further, even in a boundary friction state in which high-temperature water remains on the sliding surface, low friction of the sliding surface is effectively maintained by silicon oxide supplied from pores of the sliding surface.

Further, in a dry friction state in which the temperature rises to a higher temperature due to sliding heat generated on the sliding surface, the carbon phosphate powder moves and adheres to the opposite sliding surface by the action of the metal phosphate compound. It is considered that low friction is exhibited. This is presumably because the metal phosphate compound imparts oxidation resistance to the carbon abrasion powder to form a transfer film.

By forming a layer containing a mixed compound containing silicon oxide, a metal phosphate compound and a lithium compound in the pores of the sliding surface of the carbon material, the oxidation resistance of the carbon material can be further improved. Will be possible. And, in the sliding parts made of carbon material, it is recognized that a similar effect can be obtained by a mixed compound of silicon oxide, a metal phosphate compound and a lithium compound. In particular, it is possible to increase the thickness of the containing layer by preventing the impregnation from being blown out in the process of forming the containing layer on the carbon material with the lithium compound. For this reason, the content layer can be formed in one impregnation process without performing many impregnation process operations, and the effect of low abrasion can be obtained by the content layer.

In the pores of the sliding surface of the carbon material, when the metal of the metal phosphate compound contains aluminum and / or zinc, these metals exhibit an excellent effect of improving the oxidation resistance. I do. Particularly at high temperatures, zinc effectively imparts oxidation resistance to the carbon abrasion powder and transfers it to the opposing sliding surface to maintain a low friction state. Aluminum also maintains a low friction sliding state even at high temperatures.

The silicon oxide-containing layer and the aluminum phosphate compound-containing layer are formed in layers in the pores of the sliding surface of the carbon material in this order, so that the aluminum phosphate compound-containing layer becomes silicon oxide. And a low friction is exerted from about 200 ° C., and the low friction is maintained even when the temperature rises to shift to a dry friction state.

In the case where the containing layer is formed in the order of a layer containing the aluminum phosphate compound and a layer containing silicon oxide, the sliding surface has a boundary friction state in which the temperature of the sliding surface is 100 ° C. or more. In this case, the silicon oxide-containing layer formed in the pores is supplied to the sliding surface to maintain a low friction state even in an atmosphere accompanied by steam, thereby preventing the sliding surface from being worn. And
Even if the layer containing the aluminum phosphate compound shifts to the dry friction state as the temperature increases, the low friction state at the high temperature is maintained.

Although the above description has been made with reference to the mechanical seal as an example, the same processing is performed in the bearing. In a bearing sliding component, a layer containing a mixed compound containing silicon oxide and a metal phosphate compound is formed in pores of a sliding surface of a carbon material. When silicon oxide is formed on the sliding surface, extremely low friction is exerted on the sliding surface even in the boundary lubrication state. Also, the bearing can obtain low friction by silicon oxide supplied to the sliding surface from the pores of the sliding surface even in a high-temperature boundary friction state.

Further, when the temperature further rises due to a high temperature state or a sliding heat generated on the sliding surface, the state shifts to a dry friction state, so that the oxidation-resistant carbon abrasion powder moves and adheres to the facing sliding surface. It is considered from the result of the experiment that it exerts low friction. This is also considered to be a factor in forming the containing layer to which the metal phosphate compound imparts oxidation resistance to the carbon wear powder. Therefore, it is recognized that the effect of abrasion resistance by the layer containing the silicon oxide and the metal phosphate compound, and the effect of low friction due to the synergistic action of the metal phosphate compound with the carbon powder can be obtained.

Further, in a sliding part for a bearing, a layer containing a mixed compound containing silicon oxide, a metal phosphate compound and a lithium compound is formed in pores of a sliding surface of a carbon material. Also, in bearings used at high temperatures such as heat treatment furnaces and high-temperature processing equipment, the content layer formed by a mixed compound of silicon oxide, metal phosphate compound and lithium compound has the oxidation resistance of the sliding surface at high temperatures. At the same time, the effect of wear resistance can be obtained. In particular, while the lithium compound has a good effect on imparting oxidation resistance to carbon powder and the like, the effect of simplifying the production process of the containing layer and facilitating quality control by simplifying the process can be expected. .

Next, FIG. 1 is a sectional view in which the sliding component 1 of the present invention is mounted as a rotary seal ring 1A of a mechanical seal. In FIG. 1, the content layer of the present invention is formed in the pores on the sealing surface of the rotary seal ring 1A. Then, the fluid to be sealed is sealed in contact with the sealing surface of the stationary sealing ring 2. This mechanical seal is provided in a compressor, an engine cooling water pump, or the like, and is used when the fluid to be sealed is in a high temperature state. 3 is an axis and 4 is
Is a casing. The rotary seal ring 1A is pressed against the fixed seal ring 2 by a spring 6 attached to the case 5 of the mechanical seal.

[0048]

Next, specific embodiments of the present invention will be described.
The sliding test described below was performed using a friction and wear tester shown in FIG. FIG. 2 is a sectional view of the friction and wear tester. In FIG. 2, reference numeral 10 denotes a friction and wear tester. The friction and abrasion tester 10 is a liquid tank 1 containing high-temperature water for testing.
1, a rotary shaft 12 is provided at an upper portion of the liquid tank 11, and a holding portion 13 is provided at a lower portion. Then, the rotary sliding component 1A is attached to the rotary shaft 12, and the holding portion 1 at a position facing the rotary sliding component 1A
3 is provided with a fixed sliding part 1B. The rotary sliding component 1A attached to the rotary shaft 12 is the test sliding component of the embodiment. A thermocouple 16 is provided in the liquid tank 11. Also, the holding part 13 on the fixed sliding part 1B side
, A load cell 17 and a cantilever 18 are provided. Reference numeral 14 denotes a bearing.

The following Examples and Comparative Examples were conducted under the following test conditions using the above-mentioned ring-on-ring type friction and wear test apparatus. Main sliding conditions Sealed fluid: hot water Hot water temperature: 100 ° C. Sliding Speed: 2 m / s Sliding surface pressure: 0.6 MPa Sliding time: 3 hours Fixed sealing ring (1B): Chromium carbide coated stainless sliding material

Example 1 50 wt% of artificial graphite having an average particle size of 0.010 mm, 45 wt% of coal tar pitch, and 5 wt% of phenol resin
Was uniformly mixed, and thereafter, a kneading operation was performed for 60 minutes at a temperature of 160 ° C. using a pressure kneader. Then, after cooling, it was pulverized to 100 mesh or less using a free mill to form a molding powder. Next, this molding powder is molded by a molding press. The molding conditions were maintained at a molding pressure of 130 MPa for 5 minutes to obtain a molded product. This molded product was heat-treated in a gas atmosphere of 2500 ° C Ar to obtain a graphitized carbon sintered product having a Shore hardness of 74, a specific gravity of 1.78, and a porosity of 15%.

The impregnation of this sintered product is performed by charging the sintered product into an impregnation vessel of an impregnating apparatus, performing evacuation until the pressure reaches 0.01 kPa, and then adding 64 wt% of silica sol (Snowtex 0 manufactured by Nissan Chemical Industries). Then, a solution of a mixed compound of 36% of a first aluminum phosphate solution (first aluminum phosphate manufactured by Taki Kagaku) was injected into the impregnation vessel. Then, after holding for 20 minutes, the pressure was increased to 900 kPa using nitrogen gas, and impregnation was performed by holding for 60 minutes.
Thereafter, the sintered product was opened to atmospheric pressure and the impregnated sintered product was taken out.

The sintered product was washed and dried, and then kept at a temperature of 1000 ° C. for 1 hour in an Ar gas atmosphere to complete the heat treatment. The content layer formed in the pores of the thus formed sliding part was confirmed by an optical microscope and a scanning electron microscope. Then, this sliding part 1 is shown in FIG.
The test was carried out by attaching to a friction and wear tester shown in FIG. The results are as shown in Table 1.

Example 2 The same graphitized carbon sintered product as in Example 1 was mixed with 61 wt% of silica sol (Snowtex 0 manufactured by Nissan Chemical Industries) and a first aluminum phosphate solution (first aluminum phosphate manufactured by Taki Kagaku). Example 1 by impregnating with a solution of a mixed compound of 35 wt% and 4 wt% of lithium phosphate (manufactured by Junsei Chemical Co., Ltd.)
In the same manner as described above, a graphitized carbon sintered product was processed and formed into a sliding part. This sliding part was mounted on a wear friction tester shown in FIG. 2 as a rotating sliding part 1A and tested. Table 1 shows the results.

Comparative Example 1 The same graphitized carbon sintered product as in Example 1 was tested in a non-impregnated state as a rotary sliding part mounted on a wear friction tester. The results are shown in Table 1.

Comparative Example 2 The same graphitized carbon sintered product as in Example 1 was added to an aluminum monophosphate solution (aluminum monophosphate manufactured by Taki Kagaku) 9
3wt%, 7wt% lithium phosphate (Junsei Chemical Co., Ltd.)
A rotary sliding component 1A impregnated with a solution of the mixed compound of Example 1 and treated in the same manner as in Example 1 was attached to a wear friction tester and tested. Table 1 shows the results.

COMPARATIVE EXAMPLE 3 The same graphitized carbon sintered product as in Example 1 was impregnated with silica sol (Snowtex 0 manufactured by Nissan Chemical Industries, Ltd.), and a rotary sliding part 1A treated in the same manner as in Example 1 was subjected to a wear friction test. It was mounted on a machine and tested. Table 1 shows the results.

[0057]

[Table 1]

As a result of the above test, it was found that Examples 1 and 2 reduced the amount of wear by more than 30% as compared with Comparative Example 1. Further, it is recognized that the amount of abrasion exceeding 20% is reduced with respect to Comparative Example 2.

[0059]

The sliding component according to the present invention is excellent in oxidation resistance at high temperatures as a rotary seal ring of a mechanical seal. Further, the frictional resistance of the sliding surface is reduced due to the interposition of a layer containing a mixed compound containing silicon oxide and a metal phosphate compound, or a layer containing a mixed compound of silicon oxide and a metal phosphate compound and a lithium compound. While you can
This has the effect of reducing the amount of wear on the sliding surface. In particular, there is an effect that the frictional resistance of the sliding surface in the boundary friction state and the dry friction state at a high temperature can be reduced to reduce the wear amount. Furthermore, even in a high-temperature boundary friction sliding state, the effect of reducing the frictional resistance by the action of silicon oxide on the sliding surface of the sealing ring and reducing the wear amount can be expected.

The sliding component according to the present invention exerts an excellent effect on oxidation resistance at high temperatures as a sliding portion of a bearing. Further, the frictional resistance of the sliding surface is reduced by a layer containing a mixed compound containing silicon oxide and a metal phosphate compound, or a layer containing a mixed compound of silicon oxide and a metal phosphate compound and a lithium compound, and This has the effect of reducing the amount of wear on the sliding surface. Particularly, in a high-temperature steam atmosphere, the frictional resistance of the sliding surface in the boundary friction state and the dry friction state can be reduced to reduce the wear amount. Furthermore, even in a high-temperature boundary friction sliding state, the effect of reducing the frictional resistance by the action of silicon oxide on the sliding surface of the bearing and reducing the wear amount can be expected.

[Brief description of the drawings]

FIG. 1 is a sectional view of a mechanical seal to which a sliding component according to the present invention is attached as a sealing ring.

FIG. 2 is a cross-sectional view of a main part of a friction and wear tester that tests a sliding component of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Sliding component 11 Liquid tank 1A Rotating sealing ring 12 Rotating shaft 2 Fixed sealing ring 13 Holder 3 Shaft 14 Bearing 4 Casing 16 Thermocouple 5 Case 17 Load cell 1 Spring 18 Cantilever

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Claims (9)

[Claims] 1. A sliding part for a mechanical seal, characterized in that a carbon material having pores on a sliding surface has a layer containing a mixed compound containing silicon oxide and a metal phosphate compound in the pores. 2. A sliding part for a mechanical seal, characterized in that a carbon material having pores on a sliding surface has a layer containing a mixed compound containing silicon oxide, a metal phosphate compound and a lithium compound in the pores. . 3. The sliding part for a mechanical seal according to claim 1, wherein the metal of the metal phosphate compound contains aluminum and / or zinc. 4. The sliding component for a mechanical seal according to claim 1, wherein the containing layer is formed in a layered order in the order of a silicon oxide containing layer and an aluminum phosphate compound containing layer. . 5. The sliding component for a mechanical seal according to claim 1, wherein the containing layer is formed in the order of a layer containing an aluminum oxide compound and a layer containing silicon oxide. 6. A sliding component having pores on a sliding surface is impregnated with a mixed solution of a silicon oxide particle dispersion and a metal phosphate compound solution, or a silicon oxide particle dispersion, a metal phosphate compound solution and a lithium compound. And then heat-treating at a temperature in the range of 400 ° C. to 1300 ° C. to form a dry containing layer of the mixed solution in the pores of the sliding surface. Method of manufacturing moving parts. 7. A sliding component having pores on a sliding surface is impregnated with either a silicon oxide particle dispersion or a metal phosphate compound solution, or a silicon oxide particle dispersion or a metal phosphate compound solution and a lithium compound. Impregnated with either one of the mixed solutions, and then from 400 ° C. to 1300 °
C. heat treatment at a temperature in the range of C to form a dried primary containing layer of the impregnating liquid in the pores of the sliding surface, and then apply the other liquid on the upper surface of the primary containing layer of the pores in the sliding surface. And then heat-treating at a temperature in the range of 400 ° C. to 1300 ° C. to form a dry secondary containing layer of the other liquid. 8. A sliding part for a bearing, characterized in that said sliding part has a layer containing a mixed compound containing silicon oxide and a metal phosphate compound in said pores of a carbon material having pores on a sliding surface. 9. A sliding part for a bearing, wherein the carbon material having pores on a sliding surface has a layer containing a mixed compound containing silicon oxide, a metal phosphate compound and a lithium compound in the pores.