JPH0830519B2 - Heat resistant chain - Google Patents

Description

TECHNICAL FIELD The present invention relates to a heat resistant chain, and more particularly to a heat resistant chain that is preferably used for driving or carrying in a high temperature environment.

[Prior Art and its Problems] Conventionally, ceramics or molybdenum has been used as a driving or carrying chain material used in a high-temperature apparatus such as a high-temperature furnace having a temperature exceeding 800 ° C. However, ceramic chains are vulnerable to thermal shock, and are easily heated and cooled rapidly at high speeds and easily damaged. Further, the molybdenum chain reacts with the carbon material in the high temperature furnace to gradually carbonize and become brittle, and the chain life is short. Furthermore, carbon materials such as isotropic graphite, which have been conventionally used for transporting in ultra-high temperature furnaces that exceed 1500 ° C (high-temperature furnace conveyor), have low tensile strength, so it is best to transport their own weight. The strength reserve for transporting luggage and driving the device is small.
Further, in order to maintain the strength, the chain must be thickened, and the weight of the chain itself becomes extremely large, thereby pressing the effective volume in the furnace.

As described above, all the chains conventionally used in the high temperature apparatus have the above-mentioned drawbacks.

[Object of the Invention] The present invention has been made in view of the above problems, and is excellent in heat resistance and thermal shock resistance, has high mechanical strength, can withstand a high load, and can be reduced in size and weight. An object of the present invention is to provide a chain that is preferably used for driving or carrying in a high temperature environment.

[Means and Actions for Solving Problems] The above object of the present invention is achieved by using a carbon fiber reinforced carbon composite material as a tensile strength member that receives tensile stress in a chain direction in a chain.

That is, the present invention is a heat resistant chain which is a chain composed of a plurality of members, wherein at least the tensile strength member that receives tensile stress in the chain direction is made of a carbon fiber reinforced carbon composite material.

In the present invention, the carbon fiber reinforced carbon composite material as a tensile strength member that receives tensile stress in the chain direction (hereinafter,
CC composite) is used. This CC composite is obtained by impregnating a fiber bundle of carbon fibers, a woven fabric or a non-woven fabric with a resin to obtain a prepreg, which is carbonized by laminating, molding, curing and firing, and further impregnated with a resin or pitch. , Firing, and impregnation are repeated several times. By using the CC composite as described above, the tensile strength can be improved while utilizing the high temperature resistance characteristics such as heat resistance and thermal shock resistance of the carbon material such as graphite.

In the chain of the present invention, a compressive strength member is inserted inside a ring that is a tensile strength member that receives tensile strength. The compressive strength member is a carbon material such as graphite that has been conventionally used, It is used by arbitrarily selecting from materials with different properties such as CC composites or ceramic materials.

That is, as this compressive strength member, 1300 ~ 2800 ℃
If you want to convey a high load in a high temperature environment such as, use a CC composite, and if a medium load is required, use a carbon material such as graphite. Also, 900-1300
When carrying a high load in a medium temperature environment such as ℃, use a ceramic material.

In the chain of the present invention, the material of the chain shaft, other members such as bolts and washers that receive shear strength, etc. is arbitrary, but generally the same material as the compressive strength member is used.

 Hereinafter, the present invention will be specifically described with reference to the drawings.

FIG. 1 is a front view showing an embodiment of the heat resistant chain of the present invention, and FIG. 2 is a plan view of FIG. Further, FIG. 3 is an enlarged sectional view of a chain joint portion of the present invention. 1-3, 1 is a tensile strength member, 2 is
Is a compressive strength member, 3 is a link plate, 4 is a pipe, 5
Is a washer and 6 is a bolt.

In FIGS. 1 and 2, a compressive strength member 2 is inserted inside a tensile strength member (ring) 1 made of CC composite, and a link plate 3 is attached for the purpose of preventing the compression strength member 2 from falling off. Here, the compressive strength member 2 and the link plate 3 are divided so as not to generate tensile stress, but they are connected by the pipe (chain shaft) 4 and the ring 1 and the washer 5, and at the same time, they are mutually connected to the front and rear link plates 3. They are connected to form the chain body. Also, as shown particularly in FIG. 3, both ends of the chain shaft are washer 5
It is fastened with a bolt 6 through. The material of the pipe 4, washer 5 and bolt 6 is arbitrarily selected from carbon materials such as graphite, CC composites and ceramic materials, but it goes without saying that two or more kinds of materials may be used in combination. Nor.

[Examples] Hereinafter, the present invention will be specifically described based on Examples.

Examples 1 to 3 Three types of chains having the structure shown in FIGS. 1 and 2 and having link plate sizes of 50 × 300 mm were prepared.

Tensile strength member 1 of this chain (thickness 5mm, width 300m
CC composite was used as the material of m), and CC composite, isotropic carbon, and alumina were used as the materials of the compressive strength member 2.

The weight per link of this chain was 551 g in Example 1 using CC composite as a compressive strength member, 628 g in Example 2 using isotropic carbon, and 833 g in Example 3 using alumina. .

The above three types of chains in a high temperature furnace under nitrogen gas atmosphere
Tensile load of 500kg at each temperature of 800 ℃ and 1500 ℃
Alternatively, 1000 kg was run to evaluate strength, heat resistance and thermal shock resistance.

As shown in FIG. 4, the heat shock resistance test is performed by installing water cooling jackets 8a and 8b in front of and behind the heating means 7, and applying a tensile load of 500 kg or 1000 kg at a temperature of 800 ° C. to the chain under rapid heating and quenching conditions. It was done by driving.

Comparative Example 1 In FIGS. 1 to 3, members 1, 2 and 3 were integrally formed of isotropic carbon.

A chain using these members was evaluated for strength, heat resistance and thermal shock resistance in the same manner as in Example 1.

 The results are shown in Table 1.

As is clear from Table 1, CC is used as a tensile strength member.
Examples 1 to 3 using the composite are lightweight and have excellent properties such as strength, heat resistance, and thermal shock resistance.

In particular, Example 1, which uses alumina as the compressive strength member, is excellent in strength at 800 ° C., and thus is particularly suitable for medium temperature and high load applications. Further, Example 2 using isotropic carbon as the compressive strength member is particularly suitable for high temperature and medium load applications because it has excellent strength, heat resistance and thermal shock resistance under a load of 500 kg. CC as compressive strength member
Example 3 using the composite is excellent in strength, heat resistance, and thermal shock resistance, and thus is particularly suitable for high temperature and high load applications.

On the other hand, in Comparative Example 1 in which the tensile strength member, the compression strength member and the link plate are integrally made of isotropic carbon, cracks occur at 800 ° C and 1500 ° C under a load of 300 kg, and strength, heat resistance and thermal shock resistance are generated. It has insufficient properties such as properties and cannot be used for medium temperature and medium load applications.

[Effects of the Invention] As described above, the heat resistant chain of the present invention using the CC composite as the tensile strength member has the following effects.

1. Excellent in high temperature resistance such as heat resistance and thermal shock resistance.

2. It can be used up to 3000 ℃ in non-oxidizing atmosphere.

3. High strength, small size and light weight.

4. Easy to process and low cost.

[Brief description of drawings]

1 is a front view showing an embodiment of a heat resistant chain of the present invention, FIG. 2 is a plan view of FIG. 1, FIG. 3 is a sectional view of a seam portion of the chain of the present invention, FIG. The figure is a schematic diagram showing a test method for evaluating thermal shock resistance of a chain. 1: Tensile strength member, 2: Compressive strength member, 3: Link plate, 4: Pipe, 5: Washer, 6: Bolt, 7: Heating means, 8a, 8b: Water cooling jacket.

Claims (3)

[Claims] 1. A heat resistant chain comprising a plurality of members, wherein at least the tensile strength member that receives tensile stress in the chain direction is made of a carbon fiber reinforced carbon composite material. 2. The heat resistant chain according to claim 1, wherein the tensile strength member forms a ring, and the compression strength member is inserted inside the ring. 3. The heat resistant chain according to claim 2, wherein the compressive strength member is selected from a carbon material, a carbon fiber reinforced carbon composite material or a ceramic material.