JPS6021885A - Manufacture of composite material - 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 Application of the Invention] The present invention relates to a method for manufacturing a composite material, and particularly to a method for manufacturing a composite material suitable for manufacturing a ceramic-metal composite material or a ceramic-ceramic composite material.

[Prior art]

In recent years, non-oxide ceramics such as silicon nitride, silicon carbide, and sialon, as well as so-called new ceramic materials such as aluminum oxide and zirconium oxide, have been rapidly attracting attention as high-temperature, high-strength structural materials, and much research and development has been conducted. . These ceramics have many uses as gas turbine blades and combustors, diesel engine cylinders and pistons, and other high-temperature mechanical parts.

However, as is well known, ceramics are brittle materials, and even though they are new ceramics, cracks propagate faster and break more easily than metal materials, so they cannot be used as materials that require high strength and toughness in their original state. It has the fundamental drawback that it cannot be used.

In order to solve these problems, various studies are being conducted on the development and use of composite materials of ceramic members and metal members.

Conventionally, cermets have been proposed as such composite materials, which are manufactured by mixing and molding high-melting point ceramic powder and high-melting point metal and then sintering them. They were only dispersed, and the effect of the composite of ceramics and metal was not fully exhibited.

On the other hand, it is possible to consider a method of filling the pores of porous ceramics with molten metal to create a composite of ceramics and metal, but it is also possible to fill the pores of porous ceramics with molten metal and fill the pores with metal. Filling evenly is
Technically it is not easy.

[Purpose of the invention]

SUMMARY OF THE INVENTION An object of the present invention is to provide a method for manufacturing a composite material that eliminates the problems of the prior art described above and can produce a composite material with a large composite effect and extremely high strength.

[Narration of invention]

In order to achieve this object, the present invention utilizes a CVD reaction to precipitate a precipitate into the pores of a porous body, thereby densely filling the pores, and forming continuous pores. A part of the porous member having the porous material is heated to a precipitation temperature range of the CVD reaction, and the CVD is heated through the continuous pores.
D is a method in which a reaction gas is supplied to the heated part to cause a CVD reaction to precipitate a solid phase, and the heating part is gradually shifted. A method for manufacturing a composite material, characterized in that:

The main points are as follows.

The present invention will be described in detail below with reference to the drawings.

1 to 3 are schematic cross-sectional views of a porous member according to an embodiment of the present invention.

In the present invention, first, a part of the porous member 1 having continuous pores as shown in FIG. 1 is heated to a precipitation temperature range for CVD reaction, and a CVD reaction gas is supplied to the continuous pores. In the present invention, since CVD reaction precipitates are filled into continuous pores by the supplied CVD reaction gas, a pressing member 2 etc. is closely fixed to the heating section as shown in FIG.
Preferably, the reaction gas is allowed to escape after coming into direct contact with the holding member.

The heating method is not particularly limited as long as it heats only a portion of the porous member, but for example, if the porous member is an electrical insulator, the second
As shown in the figure, a method can be adopted in which the pressing member 2 installed on one end surface of the porous member l is made of metal and the pressing member 2 is heated with high frequency. In addition, when the porous member 1 is made of a conductive material such as graphite, a method of partially high-frequency heating the porous member 1 or a method of heating from the metal pressing member 2 side can also be adopted.

In the present invention, it is necessary to maintain heating so that only the CVD reaction part reaches the deposition temperature, and keep the other parts below the deposition temperature to ensure a passage for the CVD reaction gas. As shown, the CVD reaction gas 3 passes through the pores of the porous member 1 and stops at the pressing member 2, and is heated to the CVD reaction precipitation temperature range, thereby precipitating the CVD reaction precipitate 4. If the porous member 1 or the CVD reaction precipitate 4 has a high thermal conductivity, the heating part is heated because the precipitation reaction part is the gas contact surface of the normal pressure precipitate 4 and shifts naturally as the reaction progresses. It is sufficient to fix the CVD reaction precipitate, but if the heat conductivity is low, it is preferable to fill the CVD reaction precipitate by sequentially moving the heating section.

In this way, as shown in FIG. 3, the CVD reaction precipitates 4 are filled into the pores of the porous member 1 to produce a composite material, and then the presser member 2 is separated from the composite material.

In the present invention, the porous member may be any material as long as it has continuous pores, and its material and pore size distribution may be arbitrary. Specifically, zirconia, alumina, silica,
Examples include ceramics such as silicon carbide, but the present invention is not limited to these ceramics, and may also be porous metals or other materials. Further, there is no particular limitation on the material of the precipitate that is deposited and filled into the continuous pores of the porous member by the CVD reaction, and various precipitated substances obtained by the CVD reaction can be used. Examples include refractory metals such as W, MQ, and Ta, other superalloy materials, and ceramics such as silicon carbide. Accordingly, according to the present invention, not only ceramic-metal composites such as alumina-Ta but also ceramics-metal composites such as alumina-Ta can be used.
Composite materials, such as ceramic composite materials and metal-metal composite materials, can be manufactured by combining different materials having various characteristics.

Therefore, porous members and CVD reaction gases with various characteristics can be selected depending on the use of the composite material to be manufactured. For example, when manufacturing a ceramic-metal composite material to be used as a high-temperature member, in addition to heat resistance and heat resistance, CV
It may be precipitated by reaction D. Furthermore, when producing a ceramic-metal composite material used as a structural material for ultra-high temperatures that requires high strength and high toughness, it is preferable to precipitate a refractory metal.

[Embodiments of the invention]

EXAMPLES The present invention will be explained in more detail with reference to examples below, but the present invention is not limited to the following examples unless it exceeds the gist thereof.

Example 1 Alumina-based porous ceramic plate (40×40×
A composite body with metal was created using water droplets.

The above alumina plate and carbon steel plate (40X40X101111
) were placed on top of each other, and then inserted into a container where the atmosphere can be controlled, and held tightly with a jig. Thereafter, the carbon steel plate was induction heated to 1000°C in an inert gas (Ar). Next, Ta is introduced as a reaction gas from the surface side of the alumina plate.
Mixed gas of C71 and hydrogen (volume ratio 1:2.5)
A tx flow CVD reaction was caused to produce an alumina-Ta composite material. The flow rate of the mixed gas at this time is 1000
The heating time was 5 hours due to the C bias.

A.J., 0. and T8- are elaborately compounded (Kotoriki 1
Admitted.

〔Effect of the invention〕

As described above, in the present invention, a different material is deposited in the pores of a porous member having continuous pores by a CVD reaction, and the pores are densely filled with the CVD reaction precipitates. The combined effect is large. Furthermore, due to the anchoring effect of this precipitate, it is strongly bonded to the pore walls, making it possible to produce an extremely strong composite material.

Moreover, in the method of the present invention, not only ceramic-metal composite materials but also various different materials can be composited, so materials with various characteristics can be used depending on the application. One advantage is that you can choose. The method of the present invention can also be applied to ceramics.
If applied to the production of metal composite materials, ceramic-metal composite materials with significantly improved brittleness, strength, and toughness can be easily produced, which is extremely advantageous industrially.

[Brief explanation of the drawing]

1 to 3 are schematic diagrams showing one embodiment of the present invention, in which FIG. 1 is a sectional view of a porous member, fiT, and FIG. 2 is a CVD
FIG. 3 is a cross-sectional view showing a state in which reaction precipitates are filled, and FIG. 3 is a cross-sectional view showing a state after filling with CVD reaction precipitates. 1... Porous member, 2... Pressing member, 3... C
VD reaction gas, 4...CVD reaction deposit. Agent Patent Attorney Tsuyoshi Shigeno

Claims (2)

[Claims] (1) CVD a part of a porous member with continuous pores
It is a method of heating to a reaction precipitation temperature range, and supplying CVD reaction gas to the heated part via the continuous pores to cause a CVD reaction and precipitate a solid phase, and the heating part is gradually shifted. A method for manufacturing a composite material, characterized in that continuous pores are filled with CVD reaction precipitates to composite different materials. (2) The manufacturing method according to claim 1, wherein the porous member is a porous ceramic member. 13) The manufacturing method according to claim 1 or 2, wherein the CVD reaction precipitate is a metal.