JPH06101090A - Production of heat-resistant structural body - Google Patents

Abstract

PURPOSE:To obtain a large-size gradient functional material without causing deformation or thermal stress by adhering supporting metal layers to a heat- resistant structural body consisting of ceramic blocks, where their projecting parts are combinedly engaged with their recessed parts. CONSTITUTION:Lots of heat-resistance surface-structural members 1 consisting of ceramic are joined at projected connecting parts 2 and recessed connecting parts 3, or fitted at connecting parts 5 and recessed connecting parts 6 in a such manner that all the ceramic surfaces E are in one side to constitute a heat-resistant body 7. The metal surface F of the heat-resistant body 7 is adhered to nickel by electroforming to form a supporting metal layer 8 so that the metal layer 8 can be firmly adhered to the heat-resistant body 8. Thereby, the heat-resistant body 7 formed of a joined structure consisting of lots of heat-resistant surface structural members 1 is surely supported by the supporting metal layer 8, so that no deformation due to differences of thermal expansion between the metal and the ceramic is caused in the heat-resistant surface structural member 1 during processing.

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 heat resistant structure.

[0002]

2. Description of the Related Art In recent years, a material different from the conventional simple bonding material, that is, a functionally graded material having completely different properties between the front and the back and continuously changing from the front to the back has been developed. ing.

As an example of the functionally gradient material, one side is formed of a heat-resistant member such as ceramics and the other side is formed of a strength member such as metal. Between the heat-resistant member and the strength member, the composition changes from ceramics to metal. Some have an intermediate layer (gradient composition control layer) that continuously changes.

The functionally graded material having such a structure is
For example, application to heat-resistant structures that require high heat resistance on one side and strength as a whole member, such as constituent members used in space shuttles and fusion reactors, is being considered. .

At present, the above-mentioned functionally graded material is formed by hip sintering (hot isostatic pressing) or plasma spraying of a powder material. The size of the simple substance is used for hip sintering. It is about 5 to 30 cm square depending on the size of the pressure vessel and the functional limit of the plasma spraying apparatus.

Therefore, like the combustor of a space shuttle,
When the functionally graded material is applied to a member having a large heat-resistant area, the metal-side surface of a large number of functionally graded materials is fixed to a separately formed metal member by means such as brazing (brazing). Therefore, it is necessary to form a member having a large heat-resistant surface area.

[0007]

When a functionally graded material that is not deformed at room temperature is heated to a high temperature substantially uniformly, the metal has a larger thermal expansion than the ceramics, and therefore the metal and the ceramics have a large thermal expansion coefficient. A bimetal phenomenon occurs due to a difference in thermal expansion, resulting in bending.

Therefore, when the functionally graded material is to be fixed to another metal member by brazing, the functionally graded material is deformed (curved) by being heated to a high temperature substantially uniformly during the brazing operation. As a result, it is difficult to braze the functionally graded material and the metal member in a state where they are in complete contact.

Even when brazing is performed by applying a load from both sides, deformation and cracking often occur due to the large residual stress that occurs when cooling to normal temperature and unloading.

Therefore, brazing cannot increase the size of the functionally gradient material.

The present invention has been made in view of the above circumstances, and an object of the present invention is to make it possible to manufacture a heat-resistant structure having a large heat-resistant surface area without deformation or thermal stress.

[0012]

In order to achieve the above object, in the method for manufacturing a heat-resistant structure of the present invention, a plurality of heat-resistant surface constituting members made of a functionally graded material are used, and the ceramic surface of each heat-resistant surface constituting member is The heat-resistant surface constituting members are arranged on one side so that the peripheral surfaces of the adjacent heat-resistant surface constituting members are in close contact with each other and the metal surface is located on the other side. Deposit to form a support metal layer.

Further, in the above means, a convex connecting portion or a concave connecting portion is provided on the peripheral portion of each heat resistant surface constituting member,
The convex connecting portion and the concave connecting portion are formed so that the ceramic surface of each heat resistant surface constituting member is located on one side and the metal surface is located on the other side and the peripheral portions of the adjacent heat resistant surface constituting members are in close contact with each other. The heat resistant surface body is formed into a plate-like shape by fitting them together, and a metal is adhered to the metal surface of the heat resistant surface body by electroforming to form a supporting metal layer.

[0014]

In the method for manufacturing a heat-resistant structure of the present invention, since the plurality of heat-resistant surface constituting members are arranged so that the ceramic surfaces are located on the same side, a heat-resistant surface having a large area can be obtained.

Further, since the supporting metal layer is formed by depositing a metal on the metal surface of the plurality of heat resistant surface constituting members by electroforming, the supporting metal layer is firmly adhered to each heat resistant surface constituting member.

Therefore, each heat-resistant surface constituent member can be reliably supported by the same supporting metal layer, and at the time of processing, each heat-resistant surface constituent member is not deformed due to the difference in thermal expansion between metal and ceramics.

[0017]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows an example of a heat-resistant structural member formed according to the method of manufacturing a heat-resistant structure of the present invention. Reference numeral 1 denotes ceramics (zirconia) which is a heat-resistant member and metal (stainless steel) which is a strength member. Is a heat-resistant surface constituting member made of a functionally gradient material having an intermediate layer (gradient composition control layer) whose composition continuously changes from ceramics to metal, and the heat-resistant surface constituting member 1 is a substantially rectangular flat surface. It has a shape, and the ceramic surface E and the metal surface F are formed substantially flat.

Reference numeral 7 denotes a substantially plate-shaped heat-resistant surface main body formed by connecting a number of heat-resistant surface constituent members 1. Each heat-resistant surface constituent member 1 has a ceramic surface E on one side and a metal surface F. Are connected so that they are located on the other side, respectively.

Reference numeral 8 denotes a supporting metal layer formed by depositing nickel on the metal surface F of the heat-resistant surface main body 7 by electroforming, and the support metal layer 8 and the heat-resistant surface main body 7 form the above heat-resistant structural member. Is forming.

The manufacturing procedure of the heat-resistant structural member shown in FIGS. 1 to 5 will be described below with reference to FIGS.

A large number of heat-resistant surface-constituting members 1 are prepared, and one end surface A of each heat-resistant surface-constituting member 1 has a dovetail-shaped shape extending substantially parallel to the ceramic surface E and the metal surface F of the heat-resistant surface-constituting member 1. A ceramic surface E is provided on the convex connecting portion 2 and on the other end surface B of each heat resistant surface constituting member 1 parallel to the end surface A.
And the convex connecting portion 2 extending substantially parallel to the metal surface F.
Each of the heat-resistant surface constituting members 1 has a ceramic surface E which is provided with a dovetail-shaped concave connecting portion 3 which can be fitted with (see FIG. 2).
Is located on one side and the metal surface F is located on the other side, and the end surfaces A and B of the adjacent heat-resistant surface constituting members 1 are in close contact with each other. Are fitted to form a plurality of heat-resistant surface component connecting bodies 4 in which a large number of heat-resistant surface components 1 are connected in a rod shape (see FIG. 3).

On each one longitudinal end face C of each heat-resistant surface component connecting body 4, there is formed a dovetail-shaped convex connecting portion 5 extending along the longitudinal end face C, and each heat-resistant face structure parallel to the longitudinal end face C. The other longitudinal end surface D of the member connecting body 4 is provided with a dovetail-shaped concave connecting portion 6 capable of fitting with the convex connecting portion 5 (see FIG. 4), and the ceramic surface of each heat resistant surface constituting member connecting body 4 is provided. E is located on one side, and metal surface F is located on the other side. Adjacent heat-resistant surface component connecting members 4 are connected so that the longitudinal end faces C and D are in close contact with each other. The heat-resistant surface main body 7 in which a large number of the heat-resistant surface component connecting bodies 4 are connected in a plate shape is formed by fitting the heat-resistant surface main body 7 (see FIG. 5).

After the metal surface F of the heat-resistant surface main body 7 is subjected to pretreatment such as scouring treatment and degreasing treatment, and the ceramic surface E and the peripheral edge portion of the heat-resistant surface main body 7 are masked, the heat-resistant surface main body 7 is subjected to nickel electroplating. The supporting metal layer 8 is formed by performing electroforming in a casting tank and depositing nickel on the metal surface F of the heat resistant surface body 7 by electroforming (see FIG. 1).

After the supporting metal layer 8 is formed, the heat-resistant surface main body 7 is taken out from the nickel electroforming tank, washed with water and then heat-treated, and then the surface of the supporting metal layer 8 is flattened by machining. To mold.

As described above, in this embodiment, a large number of heat-resistant surface constituting members 1 are fitted to the convex connecting portions 2 and the concave connecting portions 3 or the convex connecting portions 5 and the concave connecting portions 6 by fitting them. Since the ceramic surfaces E are connected to each other so that the ceramic surfaces E are located on the same side to form the heat-resistant surface body 7, a heat-resistant surface having a larger area than that of the conventional single functionally gradient material can be obtained.

Since the supporting metal layer 8 is formed by depositing nickel on the metal surface F of the heat resistant surface body 7 by electroforming, the support metal layer 8 is firmly adhered to the heat resistant surface body 7. In addition, the heat-resistant surface main body 7 having a structure in which a large number of heat-resistant surface constituent members 1 are connected can be reliably supported, and at the time of processing, each heat-resistant surface constituent member 1 is not deformed due to a difference in thermal expansion between metal and ceramics. .

The manufacturing method of the heat resistant structure of the present invention is as follows.
The present invention is not limited to the above-described embodiments, and a large number of heat-resistant surface constituent members are supported in a substantially plate-like shape by means of a jig or the like without providing each heat-resistant surface constituent member with a convex connecting portion and a concave connecting portion. Then, a metal is integrally attached to the metal surface of each heat resistant surface forming member by electroforming to form a supporting metal layer, and the composition of the heat resistant surface forming member and the supporting metal layer is changed depending on the use of the heat resistant structure. It goes without saying that appropriate changes can be made and various changes can be made without departing from the scope of the present invention.

[0029]

As described above, according to the method for manufacturing a heat resistant structure of the present invention, the following excellent effects can be obtained.

(1) In any of the methods for manufacturing a heat-resistant structure according to the first and second aspects of the present invention, a plurality of heat-resistant surface constituting members are arranged so that the ceramic surfaces are located on the same side. Therefore, a heat resistant surface having a large area can be obtained.

(2) In any of the methods for manufacturing a heat resistant structure according to the first and second aspects of the present invention, the metal surfaces of a plurality of heat resistant surface constituent members are supported by electroforming metal. Since the metal layer is formed, the supporting metal layer is firmly attached to each heat-resistant surface constituent member, and each heat-resistant surface constituent member can be reliably supported by the same support metal layer.

(3) In any of the methods for producing a heat resistant structure according to the first and second aspects of the present invention, since the supporting metal layer is formed by electroforming, the metal for each heat resistant surface constituting member is formed at the time of processing. Does not deform due to the difference in thermal expansion between the ceramics and the ceramics.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing an example of a heat resistant structural member formed based on a method for manufacturing a heat resistant structure of the present invention.

FIG. 2 is a perspective view showing an example of a procedure for manufacturing a heat resistant structural member based on the method for manufacturing a heat resistant structure of the present invention.

FIG. 3 is a partially cut perspective view showing an example of a procedure for manufacturing a heat resistant structural member based on the method for manufacturing a heat resistant structure of the present invention.

FIG. 4 is a partially cut perspective view showing an example of a manufacturing procedure of a heat resistant structural member based on the method for manufacturing a heat resistant structure of the present invention.

FIG. 5 is a partially cut perspective view showing an example of a manufacturing procedure of a heat resistant structural member based on the method for manufacturing a heat resistant structure of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Heat-resistant surface constituent member 2,5 Convex connecting part 3,6 Concave connecting part 7 Heat-resistant surface main body 8 Supporting metal layer E Ceramic surface F Metal surface

Claims (2)

[Claims] 1. A plurality of heat-resistant surface constituting members made of a functionally graded material, wherein the ceramic surface of each heat-resistant surface constituting member faces one side.
Further, the metal surface is located on the other side and the peripheral portions of the adjacent heat-resistant surface constituting members are arranged so as to be in close contact with each other, and the metal is integrally attached to the metal surface of each heat-resistant surface constituting member by electroforming to support it. A method of manufacturing a heat-resistant structure, which comprises forming a metal layer. 2. A convex connecting portion or a concave connecting portion is provided on a peripheral portion of a plurality of heat resistant surface constituting members made of a functionally graded material,
The convex connecting portion and the concave connecting portion are formed so that the ceramic surface of each heat resistant surface constituting member is located on one side and the metal surface is located on the other side and the peripheral portions of the adjacent heat resistant surface constituting members are in close contact with each other. A method for manufacturing a heat-resistant structure, characterized in that the heat-resistant surface body is formed into a plate-like shape by fitting them together, and a metal is attached to the metal surface of the heat-resistant surface body by electroforming to form a supporting metal layer.