JPH0320675B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a high pressure heating device. More specifically, the present invention relates to an apparatus that uses gas as a pressure medium and can easily perform different phase bonding by heating under a pressure of up to about 20,000 Kgf/cm ² .

Prior Art High-pressure heating devices that use gas as a pressure medium and can raise the temperature at pressures up to 10,000 Kgf/cm ² began to be used in laboratories around 1950.
This high-pressure type heating device is constructed by combining a pressure intensifier for compressing and pressurizing gas, piping for guiding the gas, and a pressure-resistant cylinder for accumulating high-pressure gas.

When pressure is generated by injecting gas into the inside of a pressure-resistant cylinder, a tension that slightly exceeds the absolute value of this internal pressure is
It occurs in the circumferential direction of the inner wall of the cylinder. If the inner pressure and inner diameter are kept constant and the outer diameter of the cylinder is increased, the circumferential tension on the inner wall will decrease, but it will never fall below the absolute value of the applied inner pressure.

If an internal pressure of 10,000 Kgf/ ^mm2 is applied to a pressure-resistant cylinder, the circumferential direction of the inner wall of this cylinder will be
This means that a tension of 100Kgf/cm ² or more was applied.

Such a high value of tension is applied to both the pressure intensifier and the piping system, and during use, the pressure is removed and loaded repeatedly, and as the equipment becomes larger, the effects of this increase become greater, leading to damage. Therefore, the actual working pressure is currently lower than 2000 Kgf/cm ² .

Purpose of the Invention The present invention was made to solve this problem, and its purpose is to provide a high-pressure heating device that can heat and raise the temperature of a gas at a pressure of up to 20,000 Kgf/cm ² .

Structure of the Invention Conventionally, it has been known that in order to withstand tension caused by high pressure, compressive force can be applied from the outside of the cylinder of each member to cancel it out. However, if the pressure intensifier and piping system are constructed in this way, they will become complicated and difficult to manufacture.

The inventor believed that the key to solving the problem lies in the idea that high pressure cannot be achieved unless gas is highly compressed. When a gas is compressed, its density increases and it gradually becomes more similar to a liquid. Therefore, high pressure gas should be able to easily generate high pressure even if it is not highly compressed. From this point of view, the relationship between pressure and density of argon gas was actually measured and calculated, and the results shown in FIG. 1 were obtained.

According to Figure 1, 2000 kg of argon gas at 25℃
When compressed to f/ ^cm2 , it becomes 685amagat unit (1220g/
cm ³ , and to increase the pressure to 10000 Kgf/cm ² , the density can be increased to 1000 amagat units (1784 g/cm ³ ). That is, when the volume of argon gas at 2000 kgf/cm ² is taken as 100, it can be seen that if it is compressed to 68.4, the pressure of argon gas will reach 10000 kgf/cm ² . Moreover, in order to increase this to 20000 Kgf/cm ² , the volume should be reduced to 60.0. If high pressure can be generated with a volume change of this magnitude, high pressure can be generated by press-fitting the piston directly into the container body without using a pressure intensifier or piping system. It turns out that such a complicated mechanism is not required. The present invention was completed based on this knowledge.

The gist of the present invention is that a piston having a cylindrical portion can be fitted into a multiple cylindrical pressure-resistant cylinder from one end thereof, and a gas sealing lid is provided at the other end so that gas can be compressed to a high pressure. A high-pressure heating system that is characterized by having a liner made of a thin cylinder with corrosion resistance and malleability attached to the inner wall of the cylinder, an electric furnace installed inside the pressure-resistant cylinder, and a gas sealing lid or a check valve installed on the piston. The device is located in

To explain this based on the drawings, FIG. 2 shows a sectional view of the high-pressure heating device of the present invention.

In the figure, 1 is a piston, 2 is an electric conductor, 3 is a liner, 4 is a multi-cylindrical pressure-resistant cylinder, 5 is an electric furnace, 6 is a flange, 7 is a gas sealing lid, 8 is a check valve, and 9 is a check valve Hydraulic cylinder for opening and closing, 10 is a water cooling jacket, 11 is a heating element, 12 is a heat insulating layer, 1
3 is a sample holding table, 14 is an argon feed pipe, 1
5 is a hydraulic pipe, 16 is a check valve opening/closing operation rod, 17,
18 indicates packing, and 19 and 20 indicate bolts.

The multiple cylindrical pressure-resistant cylinder (hereinafter simply referred to as cylinder) 4 is made up of multiple cylinders that are press-fitted or shrink-fitted to generate strong compressive stress on the inner cylinder, and even when the required internal pressure is applied, It shall withstand fatigue even if a tensile stress of 1/2 or less of the tensile strength is generated and repeated stress is applied. A liner made of a highly corrosion-resistant and malleable material such as SUS or ABP is attached to the inner wall of the cylinder 4 to prevent the cylinder from being contaminated and corroded by moisture and other trace components. . And on the outside is a water cooling jacket 1
Cool by 0.

Since the internal pressure is directly applied to the piston 1 as a compressive force, a material having high compressive strength, such as an SKH-based material or a tungsten carbide-based material, is used.

The electric furnace 5 is made up of a heating element 11, a heat insulating layer 12, and a thermocouple, and has a space therein for holding an object to be processed.The object to be processed is held by a sample holding table 13. Heating takes place from the outside through electrical conductors 2.
The heat insulating layer has sufficient heat insulating performance to prevent the temperature of the cylinder or piston from rising when the object to be processed is maintained at the required temperature.For example, several cylinders with one end sealed are stacked so that they share a central axis The gap is filled with a heat insulating material such as alumina or silica. The temperature of the heating element is controlled by a thermocouple.

In this device, there is a piston inside the cylinder.
When internal pressure is applied, circumferential tension is generated in the cylinder 4 and compressive force is generated in the piston 1. At the same time, axial tension is generated in the cylinder 4, so a compressive force is applied to the inner wall of the cylinder in advance. I'll keep it. This compressive force is applied using a flange 6 and bolts 20 as shown in the figure, or by hydraulic pressure. The former is advantageous for small-sized devices, and the latter is advantageous for large-capacity devices.

There is a gas sealing lid 7 at the bottom of the cylinder 4,
This seals the bottom end. A check valve 8 and an argon feed pipe 14 are attached to the gas sealing lid 7, forming a mechanism that can exhaust or introduce gas inside the cylinder. At the bottom of the check valve 8, there is a hydraulic cylinder 9 for opening and closing the check valve, which is a driving device for opening and closing the check valve, a hydraulic piping 15 for sending oil to the cylinder, and a reverse hydraulic cylinder 9 for transmitting the force of the cylinder. A stop valve opening/closing operation rod 16 is installed. To operate this apparatus, the piston 1 and the electric furnace 5 are pulled upward, a workpiece is placed in the electric furnace 5, and then the object is inserted into the cylinder 4. Next, the air remaining in the cylinder 4 is discharged through the check valve 8, and gas as a pressure medium is pressurized to a pressure of about 2000 kgf/cm ² , for example.
After reaching a certain level of pressure, the check valve 8 is closed. Next, the piston 1 is pushed down to compress the gas in the cylinder to generate high pressure, and current is passed through the electric furnace 5 to heat it.

Effects of the Invention According to the high-pressure heating device of the present invention, (1) Unlike conventional HIP (Hot Isostatic Press) devices, high pressure is not applied to the pressure intensifier or piping system, and the cylinder and gas sealing lid Since high pressure is applied only to the piston, the conventional practical working pressure of about 2000Kgf/cm2 has been reduced to 20000Kgf/ ^cm2 .
The pressure can be increased to about 10 times Kgf/cm ² .

(2) Conventional HIP equipment was only used to remove pores in ceramic sintered bodies and cast products, and for various types of diffusion bonding, but with the equipment of the present invention, it can be used under high pressure. Since it can be operated at 100 mL, it has excellent effects such as making it possible to easily produce composites that were conventionally considered impossible to produce, and expanding the scope of their use.

[Brief explanation of the drawing]

Figure 1 is a diagram of the relationship between argon pressure and density, Figure 2
The figure is a cross-sectional view showing an embodiment of the high-pressure heating device of the present invention. 1: Piston, 2: Electrical conductor, 3: Liner,
4: Multiple cylindrical pressure cylinder, 5: Electric furnace,
6: Flange, 7: Gas sealing lid, 8: Check valve,
9: Hydraulic cylinder for opening and closing check valve, 10: Water cooling jacket, 11: Heating element, 12: Heat insulating layer, 13:
Sample holding table, 14: Argon supply piping, 15:
Hydraulic piping, 16: Check valve opening/closing operation rod, 17, 1
8: Packing, 19,20: Bolt.

Claims (1)

[Claims] 1. A piston having a cylindrical portion can be freely fitted into a multiple cylindrical pressure-resistant cylinder from one end thereof,
A gas sealing lid is provided at the other end so that gas can be compressed to high pressure, a liner made of a thin cylinder with corrosion resistance and malleability is attached to the inner wall of the pressure cylinder, and an electric furnace is installed inside the pressure cylinder. A high-pressure heating device characterized by being equipped with a gas sealing lid or a piston check valve.