JPH0723260B2 - Method for producing glassy carbon material - Google Patents

Description

TECHNICAL FIELD The present invention relates to a method for producing a glassy carbon material. Here, the "glassy carbon material" includes not only glassy carbon alone but also a composite material containing glassy carbon as a base material. The glassy carbon material has high wear resistance and a small friction coefficient, and is excellent as a material for precision processed parts.

〔Overview〕

The present invention is a method for producing a glassy carbon material in which a thermosetting resin in which a single substance or a reinforcing material is mixed is cured, and then heated and carbonized and baked. After processing, apply hydrostatic pressure of 1000 atm or more in an inert atmosphere to 1200
The present invention provides a glass-like carbon material that has a low frictional resistance with a mating material in sliding contact, does not damage the mating material, and has excellent wear resistance and durability by heat treatment at ℃ to 1600 ℃.

[Conventional technology]

At present, various types of devices for recording / reproducing by using a sheet or film having a magnetic layer or paper as a recording medium are commercially available. These recording / reproducing devices include a large number of parts which are constantly or temporarily slidably in contact with the recording medium. Examples of this type of component include a flexible disk head slider, a hard disk flying slider, a thermal printing head, and a magnetic head. These parts are required to have characteristics of excellent durability and not damaging a recording medium which is in sliding contact with the parts. Also,
These parts, particularly the magnetic head, require ultra-precision processing of several microns to several tens of microns, and the precision processing characteristics of the material are required.

Materials for such parts include silicon dioxide, alumina, silicon carbide, hard glass, alumina-based ceramics,
Ferrite, calcium titanate, barium titanate and the like are commonly used. However, although these materials are suitable for precision parts, they have high hardness and poor slidability with respect to the recording medium, and therefore may damage the recording medium.

Further, a graphite material is known as a material having extremely good slidability, but it has a large abrasion property and it is difficult to maintain the same shape stably for a long period of time. In addition, because of the constituent grains, sufficient denseness cannot be obtained, which is not suitable for use as a precision part.

Therefore, the present applicant has conducted various studies in order to solve the above-mentioned drawbacks and found that glassy carbon solves the above-mentioned drawbacks, and filed an application first. This application is published as Japanese Patent Laid-Open Nos. 59-84325 and 59-144019.

Glassy carbon is a material having an appropriate antifriction property, and when it slides on a mating material, the glassy carbon itself has a property of being worn before the mating material is damaged.

The present applicant has previously filed a method for producing glassy carbon having excellent wear properties and a composite material using glassy carbon as a matrix. For the production method of glassy carbon, see JP-A-59-169915 and JP-A-60-
131816, JP-A-60-171208, JP-A-60-17
1209, JP-A-60-171210 and JP-A-60-
It is published as the 1712011 publication. The composite materials are disclosed in Japanese Patent Application Nos. 61-268444 and 61-300577.

[Problems to be solved by the invention]

However, as a result of further tests, it was found that the glassy carbon produced by the known production method may have insufficient wear resistance due to the roughness and hardness of the surface of the mating material.

The present invention has a low frictional resistance with a mating material, does not damage the mating material, without applying a lubricant to the surface of the mating material in sliding contact and without providing a protective film on the surface of the mating material. It is an object of the present invention to provide a method for producing a material capable of producing a sliding contact component having excellent wear resistance and durability.

[Means for solving problems]

The method for producing a glassy carbon material of the present invention comprises a curing step of curing a resin material containing a thermosetting resin as a main component,
In the method for producing a glassy carbon material, which comprises a carbonization and firing step of heating and carbonizing the resin material obtained by this step, the carbonization and firing step is a pretreatment step of heat treatment at 800 ° C to 1200 ° C, and this step After that, apply hydrostatic pressure of 1000 atm or more in an inert atmosphere to 1200 ℃ to 1600
And a pressure heat treatment step of heat treatment at ° C.

The main difference from the previous application is the temperature during carbonization and firing, and in particular, the processing temperature of the pretreatment step is high.

The resin material may be a thermosetting resin alone, or may be a mixture of a curing precursor with ultrafine particles or whiskers as a filler. When the filler is mixed, the treatment temperature in the pressure heat treatment step is preferably 1200 ° C to 1500 ° C. As the ultrafine particles, one or more kinds of ultrafine particles selected from metal oxide ultrafine particles, metal nitride ultrafine particles, metal carbide ultrafine particles and metal boride ultrafine particles having an average particle diameter of 1 μm or less are used. In particular, it is desirable to use one or more ultrafine particles selected from alumina ultrafine particles, silicon oxide ultrafine particles, titanium oxide ultrafine particles, silicon carbide ultrafine particles, titanium carbide ultrafine particles, silicon nitride ultrafine particles, and titanium boride ultrafine particles. . Also, as a whisker,
One or more whiskers selected from silicon carbide whiskers, silicon nitride whiskers and graphite whiskers are used.

As a method of applying pressure, a method of applying a hydraulic pressure or other mechanical force from the outside into a closed container to directly or indirectly apply pressure to the material being processed is used. By this method, the pressure of the gas in the closed container can be increased to 1000 atm or higher, and the pressure of this gas can be used to apply an isotropic pressure to the sample inside. As this method, HIP (hot isostatic pressing) treatment is particularly preferable. HIP
The treatment is a treatment method in which the pressure of the inert gas is applied to the object to be treated at high temperature.

By carrying out the pressure heat treatment step, it is possible to prevent the occurrence of voids during firing, to reduce the minute pores present in the glassy carbon, and to enable the production of a dense glassy carbon material and to improve wear resistance. Can be improved. In addition, when the filler is mixed, the bond strength between the filler and the matrix can be increased by the heat treatment under pressure.

The temperature in the pretreatment process needs to be 800 ° C to 1200 ° C, but is preferably 1000 ° C to 1200 ° C. 12
If it exceeds 00 ° C, the effect of the subsequent pressure heat treatment step cannot be obtained. Further, even when the temperature is 800 ° C. or lower, the desired effect cannot be obtained in the pressure heat treatment step.

The temperature in the pressure heat treatment step is 1200 ° C to 1600 ° C when the resin material is a thermosetting resin alone, and 1200 ° C to 1500 ° C when the resin material contains a filler, but in both cases, 1400 ° C. The above is desirable.

In the case of a thermosetting resin alone, the glassy carbon becomes graphite when the temperature exceeds 1600 ° C. In that case, the obtained carbon is greatly worn by delamination. Experiments have revealed that, for example, when the pressure is increased to 1000 atm or higher and the process is performed at 1600 ° C. or higher, the wear is significantly increased. The wide-angle X-ray diffraction profile of the sample at this time by Cu-Kα ray was examined, and it was found that d
The appearance of the ₀₀₂ peak was confirmed. With the appearance and growth of this graphite peak, the wear resistance was greatly deteriorated. From this, it was revealed that the treatment with the final temperature exceeding 1600 ° C should not be performed.

Further, when the filler is mixed and the temperature exceeds 1500 ° C., the matrix receives stress concentration on the filler surface, and carbon around the filler is graphitized. In this case, the obtained glassy carbon material has large wear due to delamination. Experiments have revealed that when a filler is mixed, for example, when the pressure is increased to 1000 atm or more and the pressure and baking are performed at a temperature of 1500 ° C. or more, the wear is significantly increased.
Therefore, it is necessary to keep the final temperature below 1500 ° C.

A good effect can be obtained when the pressure in the pressure heat treatment step is 1000 atm or higher, particularly 1500 atm or higher, regardless of the type of the resin material.

As the thermosetting resin, in addition to furan resin, phenol resin and other thermosetting resins, phenol resin and other resins modified by thermosetting by copolymerization or cocondensation can be used. Particularly, 20% by weight in the state of the initial condensate disclosed in JP-A-60-171208, JP-A-60-171209, JP-A-60-171210 and JP-A-60-171211. The thermosetting resin which can contain the above water is desirable.

The glassy carbon material obtained by using such a thermosetting resin as a raw material is a material in an amorphous state, has an appropriate antifriction property, and when the recording medium slides, the surface film of the recording medium is A material that wears itself first before it is damaged.

The ultrafine particles mentioned here are particles having a particle size of 1 μm or less, and preferably particles having a particle size of 0.1 μm or less.
As methods for producing these ultrafine particles, there are a gas evaporation method, a plasma evaporation method, a gas phase chemical method, etc. as a method utilizing a gas phase reaction, and a precipitation method, a melt spray pyrolysis method as a method utilizing a liquid phase reaction. Are known. The present invention does not have a problem in its manufacturing method.

The particle size of the ultrafine particles differs depending on the use of the glassy carbon composite, but in order not to impair the homogeneity of the glassy carbon and for the homogeneity and stability of the liquid pre-curing precursor and the mixed dispersion, Ultrafine particles having a particle size of 0.1 μm or less are desirable.

Examples of such ultrafine particles include silica ultrafine particles (Aerosil 130, primary particle size: about 16 nm), aluminum oxide ultrafine particles (aluminum oxide C, primary particle size: about 20 nm), titanium oxide manufactured by Nippon Aerosil Co., Ltd. Ultrafine particles (titanium oxide P25, primary particle size about 21n
m), silicon carbide ultrafine particles (average particle size 0.06 μm) manufactured by Shiramizu Chemical Industry Co., Ltd., silicon nitride ultrafine particles (average particle size 0.38 μm) manufactured by Kyoritsu Kiln Raw Materials Co., Ltd., and borated by Nippon Shinkin Co., Ltd. Titanium ultra fine particle sieve product (average particle size 0.90μ
m) Others can be used.

The particles can be measured by a microscope method, a Coulter counter, a centrifugal precipitation method, an electromagnetic wave scattering method, a specific surface area measurement method, or the like. The particle size of the ceramic ultrafine particles used in the present invention is determined by a scanning electron microscope. It was measured by.

Also, whisker here means natural growth from solid,
It is a needle-like crystal that grows by vapor condensation, chemical reaction, eutectic unidirectional solidification, electrodeposition, etc., and is also called whiskers. It is known that its thickness ranges from 0.05 μm or less to about 10 μm. The biggest feature of whiskers is that there are very few dislocations and defects inside the crystal,
Some have nothing. Therefore, the whisker strength is close to the ideal value of the crystal.

Although the aspect ratio (ratio between thickness and length) of whiskers is not particularly specified, generally, the higher the aspect ratio, the higher the strength of the composite material containing it. In the glassy carbon composite material of the present invention, the effect was obtained when the whiskers having the aspect ratio of 10 or more, further 50 or more were used.

The content ratio of the ultrafine particles is preferably 0.005 to 0.2, and more preferably 0.005 to 0.1 by volume ratio with respect to the glassy carbon. Within this range, precision workability, wear resistance and friction coefficient are excellent. If the content of the ultrafine particles is low, the effect of mixing cannot be obtained.
On the other hand, if the amount is too large, the precision workability is deteriorated and the friction coefficient is increased.

The content of whiskers is preferably in the range of 0.005 to 0.2, and more preferably in the range of 0.005 to 0.1, by volume ratio with respect to the glassy carbon. Within this range, precision workability, wear resistance and friction coefficient are excellent. If the whisker content is low, the effect of mixing cannot be obtained.
On the other hand, if the amount is too large, the precision workability is deteriorated and the friction coefficient is increased.

When the ultrafine particles or whiskers are mixed with the curing precursor of the thermosetting resin, it is desirable to disperse the ultrafine particles or whiskers in the initial condensate of the thermosetting resin.

In addition, fiber reinforced plastic (FRP, Fiber reinforced
Similar to the manufacturing method of plastic), pretreatment of ultrafine particles and whiskers can be performed. Examples of such pretreatment include surface treatment of ultrafine particles and whiskers, addition of a surfactant to highly disperse ultrafine particles and whiskers, and dispersion of physical high shearing force. It is used to increase the reliability of the glassy carbon composite material.

[Action]

Pre-treatment of thermosetting resin under appropriate conditions and heat treatment under pressure makes it possible to obtain a dense glassy carbon material, which can improve wear resistance and increase bending strength. .

Also, by mixing ceramic ultrafine particles or whiskers with a curing precursor of thermosetting resin and firing, while maintaining the low friction coefficient of glassy carbon, wear resistance is further improved and bending strength is increased. Can be made. Therefore, by using this material, it is possible to manufacture a sliding contact component that has low frictional resistance with the mating material, does not damage the mating material, and has excellent wear resistance and durability of itself.

The mating material differs depending on the application of the sliding contact part. For example, when the sliding contact part is used with a magnetic head, a head slider of a floppy disk, or a flying slider of a hard disk, the mating material is a floppy disk, a hard disk, a magnetic tape, etc. The material is paper or polymer sheet, and when used as a ball retainer for bearings, it is steel such as SUJ2. As described above, the mating member may have any shape such as a flat surface, a curved surface, or a thread shape, and the shape may not be deformed or may be flexible.

When this material is used, for example, in a sliding contact part with a recording medium, it is possible to maintain the lubricity for a long time without using a lubricant between the recording medium and to damage the surface of the recording medium. Moreover, there is an advantage that the wear of the material itself is small.

In addition, the conductivity of the glassy carbon does not generate static electricity, and dust is less likely to adhere to the portion in contact with the disk recording medium and the recording medium itself.

The glassy carbon material of the present invention is specifically a sliding contact part such as a head slider of a flexible disk, a back surface pad material of a flexible disk for single-sided recording, a flying slider of a hard disk, a thermal print head, a magnetic head, or a bearing. Ball retainers, high-speed twisting rings, vane pump blades, various bobbins and guides. These parts may be entirely composed only of the glassy carbon composite material of the present invention, or only the sliding contact portion with a mating material such as a recording medium may be composed of the glassy carbon composite material of the present invention. Good.

Furthermore, since the glassy carbon composite material of the present invention is excellent in strength, it can be used for fuel cell separators, machine parts, various jigs and the like.

〔Example〕

Hereinafter, the present invention will be described in more detail with reference to Examples.
The following example is merely an example and does not limit the technical scope of the present invention. Further, "parts" in the examples all mean "parts by weight".

(Example 1) 500 parts of furfuryl alcohol and 480 parts of 92% paraformaldehyde were dissolved by stirring at 80 ° C, and a mixed solution of 520 parts of phenol, 8.8 parts of sodium hydroxide and 45 of water was added dropwise under stirring. After completion of dropping, the mixture was reacted at 80 ° C. for 3 hours. This is followed by 80 parts phenol, 8.8 parts sodium hydroxide and 4 parts water.
A mixed solution of 5 parts was further added, and the mixture was reacted at 80 ° C. for 4.5 hours. After cooling to 30 ° C., it was neutralized with 70% paratoluenesulfonic acid. The neutralized product was dehydrated under reduced pressure to remove 150 parts of water, and 500 parts of furfuryl alcohol was added. The viscosity of the obtained resin was 680 cps at 25 ° C. The amount of water that this resin can contain was measured and found to be 38%.

This thermosetting resin was poured into a strip-shaped mold having a thickness of 5 mm and degassed under reduced pressure. Then, the mixture was heated at 50 ° C to 60 ° C for 3 hours and further at 90 ° C for 5 days. The strip-shaped material thus obtained was put into a tubular furnace, heated to 1200 ° C. in a nitrogen atmosphere at a temperature rising rate of 2 to 5 ° C./hour, held at this temperature for 2 hours, and then cooled.

Next, this glassy carbon material was inserted into the sample chamber of a hot isostatic pressing machine (HIP machine) and pressurized to 1400 ° C, 2000
Treated at atmospheric pressure for 2 hours.

The density of the obtained sample was 1.60 g / cm ³ , and the bending strength was 120.
It was 0 kg / cm ² .

(Example 2) 2 parts by weight of alumina ultrafine particles (aluminum oxide C (delta alumina) manufactured by Nippon Aerosil Co., Ltd.) having an average primary particle size of about 20 nm were added to the thermosetting resin initial condensate obtained in Example 1. % And 5% by weight, and dispersed and mixed by a sand mill. After this, the same as in Example 1, 1200
Baked at ° C. This fired product was inserted into the sample chamber of the HIP device and treated at 1400 ° C. and 2000 atm for 2 hours.

When the obtained sample was measured by X-ray diffraction, it was a delta alumina-glassy carbon composite. The density of these samples is a mixture of 2% by weight ultrafine particles 1.
The mixture of 65 g / cm ³ and 5% by weight was 1.73 g / cm ³ . The bending strength is 1260 kg / cm ² and 1300 kg / c, respectively.
It was m ² .

(Example 3) In the thermosetting resin obtained in Example 1, 2% by weight and 5% by weight of titanium oxide ultrafine particles (titanium oxide P25 manufactured by Nippon Aerosil Co., Ltd.) having an average primary particle size of about 21 nm were added. It was added in a ratio and dispersed and mixed by a sand mill. After this, the same as in Example 1, baked at 1200 ℃, HIP apparatus 140
The treatment was performed at 0 ° C. and 2000 atm.

When the obtained sample was measured by X-ray diffraction, it was a titanium carbide / glassy carbon composite. The densities and flexural strengths of these samples are 1.68 kg / cm ³ and 1220 g / cm ² , 1.68 g for ² % by weight and 5% by weight, respectively.
/ cm ³ and 1300 kg / cm ² .

Example 4 To the thermosetting resin obtained in Example 1, silicon carbide ultrafine particles having an average particle size of 0.06 μm (α-SiC, manufactured by Shiramizu Chemical Co., Ltd.) were added at a ratio of 2% by weight and 5% by weight. , And mixed with a sand mill. After this, as in Example 1, firing was performed at 1200 ° C., and treatment with a HIP device was performed at 1400 ° C. and 2000 atmospheric pressure.

When the obtained sample was measured by X-ray diffraction, it was an α-type silicon carbide / glassy carbon composite. The densities and flexural strengths of these samples were 1.68 g / cm ³ and 1250 kg / cm ² , respectively for a mixture amount of 2% by weight and 5% by weight,
It was 1.75 kg / cm ³ and 1280 kg / cm ² .

(Example 5) The thermosetting resin obtained in Example 1 has a diameter of 0.05 to 1.5 μm,
Β-type silicon carbide whiskers with a length of 20-200 μm and a specific gravity of 3.18 (Silicon carbide whiskers SCW manufactured by Tateho Chemical Industry Co., Ltd.)
Was added in proportions of 2% and 5% by weight. Further, as a water-soluble surfactant, polyethylene oxide (molecular weight: 600 to 1.1 million) was added at a ratio of 0.25% by weight, and dispersed and mixed by a sand mill. After this, as in Example 1, 1200
It was fired at ℃, and treated with a HIP device at 1400 ℃ and 2000 atm.

When the obtained sample was measured by X-ray diffraction, it was a β-type silicon carbide / glassy carbon composite. The densities and flexural strengths of these samples were 1.67 g / cm ³ and 1900 kg / cm ² , respectively, for a mixture amount of 2% by weight and 5% by weight.
It was 1.74 kg / cm ³ and 2400 kg / cm ² .

(Comparative Example 1) In order to evaluate the test results for Examples 1 to 5, an alumina ceramic (trade name "Neoceram" manufactured by Nippon Electric Glass Co., Ltd.) was used as Comparative Example 1.

(Comparative Example 2) Similarly, calcium titanate (Sumitomo Special Metal Co., Ltd., trade name "TC-105") was used as Comparative Example 2.

(Comparative Example 3) The strip-shaped thermosetting resin obtained during the process of Example 1 was used as HI.
Without treating with the P apparatus, the temperature was raised to 1400 ° C. for treatment. The density of the obtained sample is 1.51 g / cm ³ , and the bending strength is 1000 k.
It was g / cm ² .

(Comparative Example 4) In the same manner as in Example 4, silicon carbide ultrafine particles were added to the thermosetting resin obtained in Example 1 in a proportion of 2% by weight and 5% by weight, and dispersed and mixed by a sand mill. After this, the temperature was raised to 1400 ° C. to perform heat treatment, and the HIP device was not used.

When the obtained sample was measured by X-ray diffraction, it was an α-type silicon carbide / glassy carbon composite. The density and flexural strength of these samples are 2% by weight and 5% by weight.
The mixed amount of each 1.55 g / cm ³ and 1080 kg / cm
² , 1.59 g / cm ³ and 1090 kg / cm ² .

(Comparative Example 5) In the same manner as in Example 4, ultrafine silicon carbide particles were added to the thermosetting resin obtained in Example 1 in a proportion of 2% by weight and 5% by weight, and dispersed and mixed by a sand mill. This was heat-treated at 700 ° C. and HIP-treated at 1400 ° C. and 2000 atm.

When the obtained sample was measured by X-ray diffraction, it was an α-type silicon carbide / glassy carbon composite. The density and flexural strength of these samples are 2% by weight and 5% by weight.
The mixed amount of each 1.67 g / cm ³ and 1000 kg / cm
² , 1.74 g / cm ³ and 1050 kg / cm ² .

Comparative Example 6 In the same manner as in Example 4, silicon carbide ultrafine particles were added to the thermosetting resin obtained in Example 1 in a proportion of 2% by weight and 5% by weight, and dispersed and mixed by a sand mill. This was heat-treated at 1200 ° C, and HIP-treated at 1600 ° C and 2000 atm.

When the obtained sample was measured by X-ray diffraction, it was a composite of α-type silicon carbide and partially graphitized glassy carbon. The density and flexural strength of these samples is 2
1.69g / cm3 for each of 5% by weight and 5% by weight
³ and 1200 kg / cm ² , 1.76 g / cm ³ and 1200 kg / cm ² .

(Test Examples and Test Results) The samples obtained in the above Examples 1 to 5 and Comparative Examples 1 to 6 were processed, and the friction coefficient and the wear amount were measured.

(I) Measurement of friction coefficient FIG. 1 shows the shape of the test piece used for the measurement of the friction coefficient.
These test pieces were obtained from Examples 1 to 5 and Comparative Example 1 described above.
The samples obtained in ~ 6 were cut into rectangular parallelepipeds each having a length a of 4.0 mm, width b of 6.0 mm, and height h of 3.0 mm, and the sliding surface A was gradually ground to finely ground, and finally emery. A mirror finish was performed on paper # 15000. Further, the ridge portion surrounding the sliding surface A of this rectangular parallelepiped is chamfered with low-number emery paper, and gradually using a high-number emery paper, finally with a radius of 0.2 to 0.3 mm to measure the friction coefficient. Of the test piece.

Using these test pieces, the so-called "pin disk method"
The friction coefficient was measured by. That is, a test piece for measuring the friction coefficient was attached to the gimbal spring used in the floppy disk drive, and a load of about 20 g was applied from above to the friction disk and the floppy disk that was attached to the spindle and rotating plate rotating at an arbitrary speed. It was slid. At this time, the frictional force μ was calculated by obtaining the frictional force with a strain gauge attached to the arm of this device.

The disk used was γ-Fe manufactured by Hitachi Maxell, Ltd.
_{It is a 2} O ₃ coated floppy disk (MD2-DD) and a flexible disk obtained by sputtering Co-Cr as a magnetic layer.

(Ii) Measurement of wear amount FIG. 2 shows the shape of the test piece used for measurement of wear amount. These test pieces have a width w of 0 in the lateral direction on the sliding surface A of the sample piece used for measuring the coefficient of friction by a slicing machine.
A groove having a depth of 50 μm and a depth d of several μm was formed. The distance r from the end of this groove is 2.0 mm. The precision roughness was measured using a measuring instrument (HIPOSS ET-10 manufactured by Kosaka Laboratory Ltd.) to determine the sectional curve of the groove, and the groove depth was measured. This test piece was attached to a gimbal spring and attached to the head portion of a floppy disk drive. A load of 20 g was applied to this test piece to cause frictional sliding with the floppy disk, and the head was moved by one track per one rotation of the floppy disk to wear the test piece.

The wear depth was measured by measuring the groove depth of the test piece over time.

(Test Results) The above test results are shown in Tables 1 and 2. Table 1 shows the test results of Examples 1 to 5, and Table 2 is Comparative Examples 1 to 6.
The test results of are shown. In these tables, "addition amount" means the volume part of the additive to 100 volume parts of glassy carbon, and "A" in the "disc type" column is γ
-Fe ₂ O ₃ shows a coating type floppy disk, also "B" indicates a Co-Cr sputtered disk.

Regarding the amount of wear, in the case of γ-Fe ₂ O ₃ coating type floppy disk, the depth of wear after 200 hours was measured, and Co-Cr
In the case of a sputter disk, the wear depth after 100 hours was measured.

[Effects of the Invention] As described above, the glassy carbon material produced by the method of the present invention is a material having excellent wear resistance, a small coefficient of friction, and capable of precision processing. It is also excellent in strength.

When a sliding contact part is manufactured using the glassy carbon material manufactured by the method of the present invention, the lubricity can be maintained for a long time without using a lubricant between the partner material and the mating material. Excellent effects can be obtained without damaging the surface of the material and less wear of the material itself. In addition, since the glassy carbon as the main component has conductivity, static electricity does not occur,
This has the effect of preventing dust from adhering to the mating material and its contacting parts.

Further, the glassy carbon material of the present invention can be used for fuel cell separators, machine parts, various jigs, etc. by utilizing its strength.

[Brief description of drawings]

FIG. 1 is a diagram showing a shape of a test piece used for measuring a friction coefficient. FIG. 2 is a diagram showing the shape of a test piece used for measuring the amount of wear.

Claims (4)

[Claims] 1. A method for producing a glassy carbon material, comprising: a curing step of curing a resin material containing a thermosetting resin as a main component; and a carbonizing and firing step of heating and carbonizing the resin material obtained by this step. In the above, the carbonization and firing step is a pretreatment step of heat treatment at 800 ° C to 1200 ° C, and a pressure heat treatment step of performing heat treatment at 1200 ° C to 1600 ° C while applying a pressure of 1000 atm or more in an inert atmosphere after this step. And a method for producing a glassy carbon material, comprising: 2. The resin material has a curing precursor having an average particle size of 1 μm.
A material obtained by mixing one or more kinds of ultrafine particles of metal oxide ultrafine particles of m or less, ultrafine particles of metal nitride, ultrafine particles of metal carbide and ultrafine particles of metal boride with a thermosetting resin. The temperature in the above is 1200 ° C to 1500 ° C. The method for producing a glassy carbon material according to claim (1). 3. The ultrafine particles are one or more selected from alumina ultrafine particles, silicon oxide ultrafine particles, titanium oxide ultrafine particles, silicon carbide ultrafine particles, titanium carbide ultrafine particles, silicon nitride ultrafine particles and titanium boride ultrafine particles. The method for producing a glassy carbon material according to claim (2), which is ultrafine particles. 4. The resin material is a material prepared by mixing a thermosetting resin with one or more whiskers selected from silicon carbide whiskers, silicon nitride whiskers and graphite whiskers as a curing precursor, and the temperature in the pressure heat treatment step is The temperature is 1200 ° C to 1500 ° C. The method for producing a glassy carbon material according to claim (1).