JPH04285066A - Production of jig material for producing glass vessel - Google Patents

Abstract

PURPOSE:To produce a jig material for producing a glass vessel having superior workability, oxidation and wear resistances. CONSTITUTION:An aq. slurry of starting material prepd. by adding short fibers and pitch powder to carbon fibers is filtered to form a layer of the starting material on the surface of a filter medium having a prescribed surface shape. The resulting preform is compression-molded and carbonized or graphitized to obtain a carbon fiber reinforced carbon material. This carbon material is worked into a prescribed shape and a jig material for producing a glass vessel is produced.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a jig material for manufacturing glass containers made of carbon fiber-reinforced carbon material.

0002

2. Description of the Related Art It is well known that glass containers such as glass bottles and glasses are manufactured using glass forming machines such as IS machines and press machines. Glass containers formed by these molding machines usually have a temperature of 350 to 65
The temperature is 0℃. The glass container in this process is
Friction and thermal stress caused by contact with the surface of transportation jigs tend to cause surface cracks called burrs, which is why asbestos and its molded products have traditionally been used as jigs for manufacturing glass containers. Recently, since the carcinogenicity of asbestos has attracted attention, graphite materials,
Heat-resistant plastics and carbon fiber-reinforced carbon materials are beginning to be used. However, although graphite materials have high heat resistance, they have the disadvantage of poor impact resistance and breakage easily.Furthermore, molded bodies of polyimide resin, silicone resin, etc. are also used as heat-resistant plastics, but they have low heat resistance and have a short lifespan. short.

[0003] Carbon fiber reinforced carbon material (also called C/C composite) is a composite material with carbon fiber as a reinforcing material and carbon as a matrix, and has high high temperature strength, impact resistance,
Due to its excellent heat resistance, it is becoming widely used as a jig material for manufacturing glass containers (for example, Glass
Technology Vol. 26 No.
6December 1985). However, traditional C
/C composites are manufactured by laminating carbon fiber fabrics, so they have low interlaminar shear strength and are prone to delamination during processing. It was not often used for takeout tongs that required processing. Furthermore, conventional C/C composites have low oxidation resistance because they use non-graphitizable materials such as phenolic resin as a matrix, and in order to improve oxidation resistance, graphitization at high temperatures of 2600°C or higher is required. As a result, the hardness decreases, and when used as a jig material for glass manufacturing, the abrasion resistance deteriorates.

0004

SUMMARY OF THE INVENTION An object of the present invention is to produce a jig material for manufacturing glass containers that has good workability, excellent oxidation resistance, and abrasion resistance.

[0005]

[Means for Solving the Problems] The present invention involves filtering an aqueous dispersion slurry of a raw material containing short carbon fibers and pitch powder to form a layer of the raw material on the surface of a filter medium having a predetermined surface shape. A method for producing a jig material for manufacturing glass containers, which comprises: producing a preform, compression molding the preform, and then processing carbonized or graphitized carbon fiber-reinforced carbon material into a predetermined shape. It is.

[0006] The reinforcing carbon fiber short fibers used in the present invention refer to short fibers not produced by continuous spinning or chopped continuous fibers, and may be polyacrylonitrile-based, rayon-based, or pitch-based. It may be either carbonaceous or graphite.

[0007] The pitch powder that serves as the matrix melts when heated and has the function of a binder that binds and shapes the carbon fibers during molding.
The pitch may be either petroleum-based or tar-based, but
It is desirable that the residual carbon content after firing is high. In this sense, a pitch with a high softening point, preferably a softening point of 150 to 350
A tar pitch of 200 DEG to 300 DEG C. is advantageous. In addition, if the particle size of the pitch powder is too large, the pitch will not be able to enter between the carbon fibers, so high strength C/
In order to obtain a C composite, it is desirable that the particle size be 100 μm or less.

[0008] The ratio of carbon fiber short fibers and pitch powder is
When made into a C/C composite, the carbon fiber content is 5
It is desirable that the content be about 60% by volume, preferably about 10-45% by volume. In addition, carbonaceous powder such as coke or graphite may be added for the purpose of increasing the residual carbon ratio, but
In this case as well, the carbon fiber content is preferably within the above range.

[0009] The raw materials containing carbon fibers and pitch are made into a water-dispersed slurry, but this method can be made into prepreg etc. in advance and then put into water, or the two can be put into water separately. It may also be dispersed to form a slurry.

[0010] This water-dispersed slurry is filtered to form a layer of the raw material on the surface of the filter medium to produce a preform. Examples of the filter medium include a wire mesh, and the surface shape of the filter medium is set in advance so as to obtain a preform of a desired shape. For example, when obtaining a planar filter medium, use a filter medium with a flat surface.
When obtaining a cylindrical filter, a cylindrical filter medium is used. Although filtration can be carried out by suction filtration or pressure filtration, continuous pressure filtration is superior in order to improve uniformity and shape precision. According to this method, a layer of raw material is gradually formed on the surface of the filter medium according to the flow of the slurry, but if there is a difference in the thickness of the raw material layer, a difference will occur in the flow of the slurry, resulting in a uniform layer. The thickness of the layer.

[0011] When a predetermined thickness is obtained, filtration is stopped and the preform is taken out. The obtained preform is subjected to cutting, bending, etc., if necessary, and then compression molded. Examples of the compression molding method include a hot press method performed under heating, an autoclave molding method, a rubber press method, a vacuum molding method, and the like.

[0012] The obtained molded body is heated at 800°C or higher, preferably at 1000°C in a non-oxidizing atmosphere such as nitrogen or argon.
Carbonization is performed at a temperature of 1500° C. or lower to obtain a C/C composite intermediate. In this case, if the temperature increase rate during carbonization is too fast, the pitch will shrink due to thermal decomposition and gas generation will be intense, making it easy for large cracks to occur. Therefore, the temperature increase rate is usually 100°C/hr or less, preferably 20°C/hr.
Desirably less than hr. In addition, at this time, in order to suppress pitch swelling, carbonization firing is performed under pressure, or the molded body is heated at a high temperature as described in Japanese Patent Application Laid-Open No. 62-241871, which is an invention of the present inventors. Carbonization firing may be performed in a fixed state using a fixing material that does not deform. In order to improve the oxidation resistance and mechanical strength of the final product, the C/C composite intermediate obtained in this way is impregnated with pitch or thermosetting liquid resin as necessary and then re-fired. operations and/or chemical vapor deposition (CV)
D processing) may be performed.

In the impregnation process, the C/C composite intermediate is placed in a sealed container, the pressure inside the container is reduced to several tens of mmHg or less, and the gas remaining inside is expelled, and then pitch or charcoal is added to the container. Pour the thermosetting liquid resin that will be the material raw material, and then heat the inside of the container at a rate of 5 to 100 kgf/cm.
The C/C composite intermediate is impregnated with the above material at a pressure of 2. Usually, the impregnating material used here is pitch or a liquid thermosetting resin such as phenol resin or furan resin. Further, in this case, the above substance may be heated in order to adjust the viscosity. CVD
In processing, the C/C composite intermediate is placed in a furnace and
The carbon fiber is heated to 000 to 1500°C, and a hydrocarbon gas such as methane or propane diluted with nitrogen or argon is introduced under reduced pressure to cause decomposition and carbonization, and pyrolyzed carbon is deposited on the surface of the carbon fiber.

[0014] Furthermore, the intermediate of this C/C composite, or the operation of impregnating it, re-firing it, and/or
Alternatively, for those subjected to chemical vapor deposition treatment, graphitization treatment may be performed as necessary in order to improve the oxidation resistance and thermal conductivity of the final product. The graphitization treatment is carried out in a non-oxidizing atmosphere such as argon at a temperature of usually 1600 to 3000°C, preferably 2000 to 3000°C.

The C/C composite thus obtained not only has excellent uniformity with less orientation of carbon fibers, but also has short carbon fibers that are completely opened in water.
Because they are intertwined three-dimensionally, the interlayer shear strength is high and delamination is less likely to occur during processing. In addition, since pitch, which is an easily graphitizable material, is used as a matrix raw material, when used as a jig material for glass manufacturing,
It is characterized by high oxidation resistance and wear resistance.

[0016] This C/C composite is then processed into a predetermined shape and used as a jig material for manufacturing glass containers. The glass container manufacturing jig materials referred to in the present invention include dead plates such as machine dead plates, take-out tongs, pusher pads, wear transfer pads, stacker bar pads, etc., and members that come into direct contact with high-temperature glass containers. It can be applied to Machining into a predetermined shape means cutting dead plates to a predetermined size, cutting grooves parallel to the transport direction to improve the sliding of glass containers, and creating air holes for cooling. As for tongs,
In order to grip the neck of a glass container with scissors, it is cut to have a semicircular curved part that fits the contour of the neck, and pads are cut to a predetermined size or cut to a specified size. , drilling holes for screws or rivets, and cutting the surface that contacts the glass container into a triangular shape or the like to match the shape of the container. especially,
Dead plates, which are parts that require precision processing,
Application to tongs is advantageous in fully demonstrating the characteristics of this material.

[0017]

[Example] Example 1 Chopped polyacrylonitrile carbon fiber with a fiber length of 10 mm and fine pitch powder with a softening point of 250°C were dispersed in water at a ratio of 1:2 (weight ratio). The slurry was press-fitted with a slurry pump into a preforming tank in which a filter medium had been set, and filtration was performed. Filtration was stopped when the thickness reached about 5 cm, and a preform was obtained. This plate-shaped preformed body was
℃ at a rate of 100° C./hr, hot-pressed, and then carbonized at 1000° C. to obtain a C/C composite intermediate (primary carbonized product). The carbon fiber content of this primary carbonized product was 55% by volume. Next, this C/C
Temperature 200℃, pressure 10kg for composite intermediate
/cm2, and then heated to 1000°C at a heating rate of 10°C/hr in a nitrogen atmosphere.
After the temperature was raised to 1, the mixture was slowly cooled to obtain a C/C composite intermediate (secondary carbonized product). Furthermore, the same pitch impregnation and carbonization treatment as above was repeated three times on this intermediate, and then the temperature was raised to 2000°C in an argon atmosphere for 1 hour.
It was retained and graphitized to produce a carbon fiber-reinforced carbon material.

[0018] From this carbon fiber reinforced carbon material, a width of 3 mm
A dead plate measuring 195 mm wide x 280 mm long x 8 mm thick was cut out, with 11 grooves 2 mm deep and 280 mm long arranged at 6 mm intervals in the center. Similarly, cut out a flat plate 70 mm wide x 70 mm long x 6.35 mm thick, make a hole 30 mm in diameter in the center, cut it in half along the center line of the opening, and use tongs. I got it. The processing was carried out using a carbide cutting tool, and the dead plate and tongs obtained were clean and had no chips or scratches on the edges.

Comparative Example 1 8-ply satin weave polyacrylonitrile carbon fiber cloth (3
000 filament) and phenolic resin (AV Light
RM-3000A) was impregnated with a 30% by weight aqueous solution and dried to obtain a prepreg. This prepreg was laminated in a mold and press-molded at a temperature of 150° C. and a pressure of 50 kg/cm 2 to obtain a molded article. Next, this molded body was heated to 1000° C. at a heating rate of 10° C./hr in a nitrogen atmosphere, and then slowly cooled to obtain a C/C composite intermediate (primary carbonized product). The carbon fiber content of this primary carbonized product was 55% by volume. Next, this C/C composite intermediate was subjected to pitch impregnation and carbonization four times in the same manner as in Example 1, and then the temperature was raised to 2000°C in an argon atmosphere.
The mixture was maintained for 1 hour and graphitized to obtain a carbon fiber-reinforced carbon material. From this carbon fiber reinforced carbon material, in the same manner as in Example 1,
I cut out the tongs.

Comparative Example 2 For comparison, tongs were cut out of high-density graphite material currently used for manufacturing glass containers in the same manner as in Example 1.

The carbon fiber-reinforced carbon materials or high-density graphite materials of Examples and Comparative Examples were tested in air flow (500 cc/
An oxidation test was conducted by holding the sample at 400° C. for 24 hours, and a three-point bending test was conducted at room temperature. Further, the performance of the tongs obtained in Examples and Comparative Examples was evaluated using an abrasion tester under the following conditions. The amount of wear at this time was evaluated by rubbing the surface of the tongs with a glass round rod and determining the depth of the grooves cut. [Test conditions] Load: 1.5 kg Mating material: Glass round bar Sliding width: 20 mm
Number of sliding movements: 1000 times Sliding speed: 21 mm/sec The test results are shown in Table 1.

[0022]

[Table 1]

As described above, the carbon fiber-reinforced carbon material produced by the present method has higher strength and excellent wear resistance than the current high-density graphite material used as a jig material for manufacturing glass containers. It is also found that the material has higher oxidation resistance and superior wear resistance than conventional carbon fiber-reinforced carbon materials laminated with cloth.

[0024]

[Effects of the Invention] According to the method of the present invention, it is possible to produce a jig material for manufacturing glass containers that has good workability, excellent oxidation resistance, and abrasion resistance.

Claims (1)

[Claims] Claim 1: A preform is produced by filtering an aqueous dispersion slurry of a raw material containing short carbon fibers and pitch powder to form a layer of the raw material on the surface of a filter medium having a predetermined surface shape. A method for manufacturing a jig material for manufacturing glass containers, which comprises compression molding a molded body and then processing a carbonized or graphitized carbon fiber-reinforced carbon material into a predetermined shape.