JPS63247588A - High-temperature heat-insulating structure - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a high temperature insulation structure, and more specifically,
The present invention relates to a high-temperature insulation structure having excellent insulation performance at high temperatures of 0 to 3000°C and under an inert gas or vacuum atmosphere.

[Conventional technology]

Conventionally, carbon-based insulation materials have been used as insulation materials at high temperatures of 1000 to 3000°C and in an inert gas or vacuum atmosphere. Among these, carbon fibers are laminated in the form of felt and then molded into the desired shape. is often used in high-temperature vacuum furnaces. In addition, high-melting point metals such as tungsten and molybdenum are also wound into coils and used as heat shielding plates in high-temperature vacuum hot presses and the like.

Figure 2 shows HIP (HotIso), which has been used conventionally.
An example of a static press (hot isostatic press, hereinafter referred to as HIP) device is shown. In Figure 2,
4 is a heating element, 5 is a pressurizing part, 6 is a sample for molding, 7 is a heat insulating wall, and 8 is a heat shielding coil.

[Problem that the invention seeks to solve]

Although the above-mentioned carbon fiber molded product is excellent in terms of ease of handling, it has a drawback in that it has a lot of fuzz and becomes short fibers that are scattered and easily contaminate the atmosphere and the object to be treated.

In addition, it requires many molding steps and is expensive, and shielding with a high melting point metal plate can prevent heat radiation to a certain extent, but it cannot prevent heat conduction by convection.

Furthermore, carbon foam obtained by molding carbon micro hollow bodies with a binder and heating and carbonizing them is also used as a heat insulating material, but it is technically difficult to manufacture large molded products or molded products of arbitrary shapes, and It's expensive.

In the example of a conventional HIP device, as shown in FIG. 2, the heat shielding coil 8 has insufficient insulation properties and only blocks part of the heat flow, so the outside of the heat shielding coil 8 is further insulated. It was necessary to insulate it with wall 7.

The present invention has been proposed in order to solve the above-mentioned problems, and it is an object of the present invention to provide a high-temperature heat insulating structure having the properties summarized below.

■Dust is less likely to be generated.

■Since the shape cannot be maintained as a carbon micro hollow body, it is made into a self-supporting type.

■Low thermal conductivity.

■Using fine hollow carbon particles in their granular form without converting them into carbon foam provides excellent heat insulation properties.

■Simple and easy to handle.

■Excellent workability and workability.

■Withstands high temperatures (1000-3000℃).

[Means for solving problems]

The present invention solves the above-mentioned problems and has 1000
The following technical measures were applied to high-temperature insulation structures used in inert gas or vacuum atmospheres at high temperatures between 3000°C and above. In other words, metals (tungsten, molybdenum, titanium, nickel, chromium, iron, cobalt, copper, iridium, osmium, niobium, tantalum, etc. and their alloys), ceramics, and carbon (such as tungsten, molybdenum, titanium, nickel, chromium, iron, cobalt, copper, iridium, osmium, niobium, tantalum, etc., and alloys thereof), which have a melting point of 1000°C or higher and higher than the operating temperature. (contains graphite),
The hollow part of a hollow container whose bottom, side, and top surfaces were formed with plates made of boron, C/C composite, etc., was filled with carbon microhollow bodies.

Note that the reason why a metal having a melting point of 1000° C. or higher and higher than the operating temperature was used as the material for the hollow container is that a container of any shape can be easily manufactured.

[Effect]

In the high-temperature insulation structure of the present invention, the carbon micro hollow bodies filled in the hollow container made of a heat-resistant material prevent heat conduction and can achieve a good insulation effect. Further, since the carbon micro hollow bodies are not molded with a binder or the like to form carbon foam, manufacturing costs can be reduced.

〔Example〕

FIG. 1 shows a hollow container 1 according to the present invention as a hollow cylinder.
This is an example applied to IP awning. la is an upper lid, 2 is a cushioning material, 3 is a carbon micro hollow body, 4 is a heating element, 5 is a pressurizing part, and 6 is a molded product.

Unlike the conventional example shown in FIG. 2, the hollow container 1 alone can serve as an excellent heat insulating wall.

FIG. 1 is only one example of the present invention, and the shape can be arbitrarily configured depending on the site and method of use. For example,
In the case of a flat part of the furnace wall, a furnace wall with good heat insulation can be constructed by filling a cubic or rectangular parallelepiped hollow container with carbon micro hollow bodies and fixing it to the furnace wall with appropriate fasteners. In addition, in order to use it as a heat insulating material to protect the fuselage of an aircraft from high heat, carbon micro hollow bodies can be filled and fixed in a metal hollow molded body that matches the shape of the aircraft6.For example, when entering the atmosphere, It can be used as a heat insulating material under the condition that the high melting point metal forming the outer shell does not melt under such short-term high heat conditions.

The means for filling a hollow container with the carbon microhollow bodies of the present invention has a thermal conductivity that is approximately 1/3 that of conventional carbon foam, and the heat insulation properties are improved.

The carbon microhollow bodies used in the present invention were manufactured by the manufacturing method proposed by the applicant in Japanese Patent Application Laid-open No. 14110/1983.

〔Effect of the invention〕 The present invention has the following excellent effects.

■Since the carbon micro hollow bodies are used in granular form without being converted into carbon foam, a high temperature insulation structure with good insulation properties can be provided at an extremely low cost.

■A variety of insulation constructions with a wide range of applications are possible by changing the shape of the hollow container and the fixings.

(2) A high-temperature insulation structure with almost no dust generation and low hygroscopicity can be obtained, making it possible to overcome the drawbacks of carbon fiber molded bodies.

[Brief explanation of drawings]

Figure 1 shows the application of the present invention to a HIP device, where Figure 1 (a) is a longitudinal sectional view, Figure 1 (b) is a t4 cross sectional view, and Figure 2 shows a conventional HIP device. FIG. 2(a) is a longitudinal cross-sectional view, and FIG. 2(b) is a cross-sectional view. l...Hollow container 1a...Top lid 2...Cushion material 3...Carbon micro hollow body 4...Heating element 5...Pressure part 6...Molding sample 7
... Section 8 Wall 8 ... Heat shielding coil

Claims (1)

[Claims] 1. A high-temperature insulation structure used in an inert gas or vacuum atmosphere at a high temperature of 1000°C or higher and 3000°C or lower, comprising: a hollow container forming an outer shell; and carbon filled in the hollow container. A high-temperature insulation structure characterized by consisting of micro hollow bodies. 2. The high-temperature insulation structure according to claim 1, wherein the material of the hollow container is a metal with a melting point of 1000° C. or higher.