JPH0666478A - Multi-layer type thermal insulation material - Google Patents

Abstract

PURPOSE:To provide a thermal insulation material capable of keeping a superior thermal insulating performance for a long period of time even under a high temperature state. CONSTITUTION:Each of a plurality of thermal insulating plates 2 is formed with a plurality of projections 3. The thermal insulating plates 2 are piled up to constitute a multi-layered thermal insulating material 1 having a space between the thermal insulating plates 2 only by a height of each of the projections 3. The thermal insulating plates 2 are made of tungsten.rhenium where dispersion junction at a contact location is hardly generated between the projections 3 and other thermal insulating plates 2 under a high temperature condition.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat insulating material used in an electric furnace or the like, and more particularly to a multi-layer heat insulating material used in an experimental electric furnace provided in a spacecraft such as a spacecraft. Is.

[0002]

2. Description of the Related Art In recent years, in order to develop new materials and the like in various fields, an electric furnace for experiments is mounted on a spacecraft such as a space shuttle, and the electric furnace is used for experiments in a weightless state. ing. In this electric furnace, in order to reduce the weight, the size, and the power consumption, a multilayer heat insulating material in which a plurality of heat insulating plates are stacked is used. A multi-layered heat insulating plate made of tantalum having protrusions has been developed.

[0003]

By the way, in the above-mentioned multi-layered heat insulating material, the high temperature state causes contact between the respective heat insulating plates, that is, the tip of the protrusion and the other heat insulating plates. Diffusion bonding sometimes occurred at the contact point with. Then, heat may be easily transferred from the contact portion joined by the diffusion joining, and the necessary heat insulating effect may not be obtained.

The present invention has been made in view of the above circumstances, and an object thereof is to provide a multi-layer heat insulating material capable of maintaining good heat insulating performance for a long time even in a high temperature state.

[0005]

In the multi-layer heat insulating material of the first invention, the heat insulating plates having a plurality of protrusions are laminated to each other so that the height between the heat insulating plates is between the heat insulating plates. In the multi-layered heat insulating material in which a space is formed, the heat insulating plate is made of tungsten / rhenium that hardly causes diffusion bonding at a contact portion between the heat insulating plates in a high temperature state. The multi-layered heat insulating material of the second invention is such that a mesh plate formed in a mesh shape is interposed between the heat insulating plates of the first invention, and the mesh plate and the heat insulating plate are in a high temperature state. It is characterized in that it is made of tungsten / rhenium, which hardly causes diffusion bonding at the contact point. The multilayer heat insulating material of the third invention comprises a plurality of heat insulating plates and support members provided at both ends of these heat insulating plates and supporting the heat insulating plates in layers at predetermined intervals. The heat insulating plate and the supporting member are characterized by being made of tungsten / rhenium and ceramic, which hardly cause diffusion bonding at their respective contact portions at high temperatures.

[0006]

According to the multi-layer heat insulating material of the first aspect of the present invention, diffusion bonding at each contact point between each protrusion and another heat insulating plate is prevented at high temperature, and heat transfer at this contact point is minimized. It is suppressed to the limit. According to the multilayer heat insulating material of the second invention, in addition to the first invention, the protruding portions of each heat insulating plate are in contact with another heat insulating plate via the mesh plate, The contact area is reduced and the heat transfer at the contact location is greatly reduced. According to the multilayer heat insulating material of the third aspect of the invention, since the heat insulating plates are supported at a predetermined interval, heat transfer due to contact between the heat insulating plates is eliminated. Further, in a high temperature state, diffusion bonding at the contact portion between the support member and the heat insulating plate is prevented, and heat transfer at the contact portion is suppressed to a minimum.

[0007]

EXAMPLES Examples of the multilayer heat insulating material of the present invention will be described below with reference to the drawings. First, the multilayer heat insulating material of the first embodiment will be described with reference to FIGS. 1 and 2. In the figure, reference numeral 1
Is a multi-layered heat insulating material, which is used for an electric furnace mounted on a spacecraft such as a space shuttle. This multi-layered heat insulating material 1 is formed by stacking a plurality of heat insulating plates 2, 2, ... On each heat insulating plate 2, 2 ,.
3 are formed, and a predetermined space is formed between the heat insulating plates 2, 2 ...

Each of the heat insulating plates 2, 2, ... Of the multi-layer heat insulating material 1 is in a high temperature state where the heat insulating plates 2, 2, ... Contact each other, that is, the protrusions 3, 3 ,. It is made of tungsten / rhenium that hardly causes diffusion bonding at the contact point with, and is formed by forming this thin film of tungsten / rhenium and further forming the protrusions 3, 3, ... By pressing or the like. .

Thus, the multi-layer heat insulating material 1 of the above embodiment
According to the method, since the protrusions 3, 3, ... Are laminated on the heat insulating plates 2, 2, ... Made of tungsten / rhenium in which diffusion bonding hardly occurs in the high temperature state, the protrusions 3, 3 ,. Parts 3, 3 ... and other heat insulating plate 2
It is possible to almost prevent the diffusion bonding at the contact portion with and to minimize the heat transfer at the contact portion. Therefore, a good heat insulating effect can be maintained for a long time, and an extremely reliable electric furnace can be constructed.

Next, the multilayer heat insulating material of the second embodiment is shown in FIG.
Explained by. As shown in the figure, the multilayer heat insulating material 11 of this embodiment includes a plurality of heat insulating plates 2, 2, ... And a mesh mesh plate 5, 5 interposed between these heat insulating plates 2, 2.
... and the mesh plates 5, 5
Is formed by braiding a plurality of wires made of tungsten and rhenium.

According to the multi-layered heat insulating material 11 thus constructed, the protruding portions 3, 3, ... Of the heat insulating plates 2, 2 ,.
Are brought into contact with the other heat insulating plates 2, 2, ... through the mesh plates 5, 5, .. Therefore, the contact area at the contact portion can be significantly reduced. As a result, heat transfer from the contact portion can be significantly reduced, and a better heat insulating effect than that of the first embodiment can be obtained.

Since the mesh plates 5, 5, ... Are also made of tungsten / rhenium, the mesh plates 5, 5, ..., The heat insulating plates 2, 2, ... And the heat insulating plates 2, 2 ,. It is possible to almost prevent diffusion bonding at the contact points with the protruding portions 3, 3 ,. Therefore, it is possible to suppress the heat transfer at the contact point to the minimum, and it is possible to maintain a very good heat insulating effect for a long period of time.

Next, the multilayer heat insulating material of the third embodiment will be explained with reference to FIG. As shown in the figure, the multilayer heat insulating material 21 of this embodiment is formed by supporting a plurality of flat heat insulating plates 22, 22, ...
22 ... is supported by support members 23, 23 on the respective side portions.

The heat insulating plates 22, 22, ... And the supporting members 23, 23 constituting the multi-layer heat insulating material 21 are made of tungsten / rhenium which hardly causes diffusion bonding at their respective contact portions at high temperature. It is made of ceramic.

According to the multi-layered heat insulating material 21 thus constructed, the heat insulating plates 22, 22 ... Are supported at a predetermined interval, so that each heat insulating plate 2 is supported.
Since there are no contact points between 2, 22, ..., Therefore, heat transfer between the respective heat insulating plates 22, 22, ... Can be significantly reduced, and an extremely high heat insulating effect can be obtained.

Further, the support members 23, 23 are made of ceramic,
Since the heat insulating plates 22, 22 ... Are made of tungsten / rhenium, the support members 23, 2 are kept in a high temperature state.
It is possible to almost prevent diffusion bonding at a contact portion between the heat insulating plate 3 and the heat insulating plates 22, 22 ... And to suppress heat transfer at the contact portion to a minimum. The mesh plate 5 used in the second embodiment is made of tungsten.
A flat plate made of rhenium may be formed into a net shape by forming a plurality of holes. Further, it goes without saying that the multi-layer heat insulating materials 1, 11 and 12 of the above-mentioned embodiment can be used as heat insulating materials for all devices other than the electric furnace.

[0017]

As described above, according to the multilayer heat insulating material of the present invention, the following effects can be obtained. First
According to the invention, since the heat insulating plate is formed of tungsten / rhenium, it is possible to almost prevent diffusion bonding at the contact portion between the protruding portion of each heat insulating plate and another heat insulating plate in a high temperature state. It is possible to minimize the heat transfer at this contact point. Second
According to the invention, in addition to the first invention, the protruding portions of the respective heat insulating plates are in contact with other heat insulating plates via the mesh plate made of tungsten / rhenium, so that the contact points It is possible to reduce the contact area at and the heat transfer from the contact portion can be greatly reduced. According to the third aspect of the invention, since the heat insulating plates are supported with a predetermined space therebetween, it is possible to eliminate heat transfer due to contact between the heat insulating plates. Further, since the supporting member is made of ceramic and the heat insulating plate is made of tungsten / rhenium, it is possible to almost prevent diffusion bonding at the contact portion between the supporting member and the heat insulating plate at high temperature, and heat at the contact portion is prevented. The transmission of can be suppressed to a minimum. That is, by using the multilayer heat insulating material of the present invention in an electric furnace or the like, it is possible to construct an extremely reliable electric furnace that maintains a good heat insulating effect for a long period of time.

[Brief description of drawings]

FIG. 1 is a side sectional view of a multi-layer heat insulating material for explaining the structure of the multi-layer heat insulating material according to the first embodiment of the present invention.

FIG. 2 is a plan view of the multilayer heat insulating material for explaining the structure of the multilayer heat insulating material according to the first embodiment of the present invention.

FIG. 3 is a side sectional view of a multilayer heat insulating material for explaining the structure of the multilayer heat insulating material according to the second embodiment of the present invention.

FIG. 4 is a side sectional view of a multilayer heat insulating material for explaining the structure of the multilayer heat insulating material according to the third embodiment of the present invention.

[Explanation of symbols]

 1, 11, 21 Multi-layered heat insulating material 2, 22 Heat insulating plate 3 Projection part 5 Mesh plate 23 Support member

Claims (3)

[Claims] 1. A multi-layered heat insulating material comprising a plurality of heat insulating plates having a plurality of protrusions stacked together to form a space between the heat insulating plates at the height of the protrusions. The multi-layered heat insulating material is characterized in that the plate is made of tungsten / rhenium that hardly causes diffusion bonding at a contact portion between the heat insulating plates in a high temperature state. 2. A mesh plate formed in a mesh shape is interposed between the heat insulating plates, and the mesh plates are almost free from diffusion bonding at a contact point with the heat insulating plate in a high temperature state. The multi-layer insulation material according to claim 1, wherein the multi-layer heat insulation material comprises tungsten-rhenium. 3. A plurality of heat insulating plates and a support member which is provided at both ends of these heat insulating plates and supports the heat insulating plates in layers at predetermined intervals. These heat insulating plates and support members are provided. A multi-layered heat insulating material comprising tungsten / rhenium and ceramics, which hardly cause diffusion bonding at each contact location at high temperature.