JP2646904B2 - Method of joining ceramic members - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for joining ceramic members, and more particularly, to a method for joining ceramic members which can firmly join ceramic members together to obtain a joined body having excellent joint sealing performance. .

[0002]

2. Description of the Related Art Ceramics are widely used as structural materials such as high-strength members and corrosion-resistant members at high temperatures, and for functions having electrical, magnetic, optical or biological / chemical functions. There is expected.

[0003] However, while ceramics excel in one or several functions, other functions are very poor. That is, ceramics generally have heat resistance,
It has good corrosion resistance and high hardness, but has disadvantages such as poor impact resistance and lack of reliability.

[0004] For this reason, in order to combine excellent functions and obtain industrially useful materials, joining of different types of ceramics is inevitable. Therefore, research and development of a joining technique for joining ceramic members to each other have been actively performed.

Conventional bonding methods are roughly classified into an adhesive bonding method, a mechanical bonding method, a chemical bonding method, and the like.

[0006]

In any of the above-mentioned conventional joining methods, the shape of the joining surface of the members to be joined has a great influence on the joining strength and function of the obtained joined body and has a non-smooth joining surface. A high-strength, high-performance joined body cannot be obtained from the joined members.

[0007] For example, if the unevenness of the joining surface of the members to be joined is severe, gaps (voids) are generated in the joining portion, and the joining strength and sealing performance are greatly deteriorated.

Therefore, in the prior art, no matter which joining method is employed, it is necessary to smooth the joining surface of the members to be joined to some extent in order to perform reliable joining. Has been done. However, machining requires high processing costs, especially for high-hardness ceramic members,
There is a disadvantage that it is difficult to cope with a member having a complicated shape.

SUMMARY OF THE INVENTION The present invention solves the above-mentioned conventional problems, and easily and firmly joins even a non-smooth member to be joined without performing machining or the like before joining, thereby significantly joining. An object of the present invention is to provide a method for joining ceramic members, which is capable of obtaining a high-strength, high-performance joined body having high strength and excellent sealing performance.

[0010]

A method of joining ceramic members according to the present invention is a method of joining both members by contacting and heating the ceramic member and the ceramic member via an intermediate material. A ceramic that is more easily deformable than the member to be joined at the joining temperature, and deforms at the joining temperature according to the shape of the joining surface of the member to be joined.
Characterized by using the scan material.

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

FIG. 1 and FIG. 2 are cross-sectional views for explaining one embodiment of a method for joining ceramic members according to the present invention.

As shown, in the method of this embodiment,
When the member 1 made of ceramics and the member 2 made of ceramics are joined, both joining surfaces 1a
Without performing the smoothing treatment on the joint surfaces 1a and 2a, the intermediate member 3 is interposed between the joint surfaces 1a and 2a and heated and pressed while leaving the uneven surface (FIG. 1). In the present embodiment, the intermediate material 3 is used in which the adhesive 4 is applied to the surfaces to be joined to the members 1 and 2 to be joined.

As described above, by laminating the member to be joined 1, the intermediate member 3 and the member to be joined 2 and applying heat and pressure, the intermediate member follows the shape of the joining surfaces 1a and 2a of the members to be joined 1 and 2. Thus, a bonded body 10 having no gap between the bonded surfaces and having extremely high bonding strength can be obtained (FIG. 2).

In the present invention, the intermediate material may be any ceramic that can be more easily deformed at the heating temperature at the time of joining than the ceramic constituting the member to be joined and deforms along the shape of the joining surface of the member to be joined. There is no particular limitation . In general, depending on the type of the member to be joined, ceramic
What is consists of one or more compounds selected from the scan by Li Cheng group be appropriately selected.

[0016]

The thickness of such an intermediate material may be any thickness as long as it can sufficiently absorb the unevenness of the joining surface of the member to be joined. In general, the phase difference of the unevenness of the joining surface of the member to be joined, for example, It is appropriately determined according to the surface roughness and the like.
About 5 mm.

The adhesive is not particularly limited as long as it can withstand the processing temperature at the time of joining and exhibits sufficient joining strength, and is not particularly limited. Generally, an inorganic adhesive is effective.

In the illustrated example, the adhesive is applied to the intermediate member in advance. However, the adhesive may be applied to the joining surface of the member to be joined. It may be applied to both the joint surface. Further, the adhesive may be used as a separately prepared adhesive sheet inserted between the member to be joined and the intermediate material.

It should be noted that an adhesive is not necessarily required, and if sufficient adhesive strength can be obtained without using an adhesive, it may not be used. Further, it may be interposed only between one of the members to be joined and the intermediate material having insufficient adhesive strength.

In the present invention, the joining temperature and pressure vary depending on the material to be joined and the material of the intermediate material.
Normally, at a high temperature of 500 to 1500 ° C., 0.1 to 1
Bonding is performed by applying a pressure of 000 kg / cm ² .

In the present invention, the joining surface of the members to be joined may be a non-smooth surface, but the degree of non-smoothness at which the joining effect of the present invention is best exhibited is the maximum amplitude of the unevenness of the joining surface. That is, the difference between the highest position of the convex portion and the lowest position of the concave portion is about 10 to 800 μm. As described above, the method of the present invention is extremely effective for joining members having a non-smooth surface to be joined, but a member to be joined having a non-smooth surface and a member having a smooth joining surface. It is needless to say that the present invention can also be applied to the case where the members are joined together or the joined surfaces are smooth surfaces.

[0023]

In the method of the present invention, at the joining temperature,
By deforming the intermediate material along the shape of the joint surface of the member to be joined, even if the member to be joined has a non-smooth surface, a joint with high strength and excellent sealing performance with no gap at the joint interface can do. In this case, since the joining member having a non-smooth surface can be joined without performing a surface smoothing process, machining processing for smoothing is not required, and the joining surface is a non-smooth surface. If there is, the effective joining area contributing to joining increases, and a good anchoring effect is provided between the intermediate member and the member to be joined. The effect of greatly improving compared with the joined body is also exhibited.

[0024]

Further, by providing an adhesive between the member to be joined and the intermediate material, the gap at the joining interface is more reliably prevented, and a significantly better joined body can be obtained.

[0026]

The present invention will be described more specifically with reference to the following examples.

Example 1 According to the method of the present invention shown in FIGS.
Bonding between SZ (ZrO ₂ -8 mol% Y ₂ O ₃ ) was performed. The maximum amplitude of the unevenness of the YSZ bonding surface (difference between the highest position of the convex portion and the lowest position of the concave portion) was 200 μm or less.

As the intermediate material, a 1 mm thick MgO / A
A fired body mainly containing l ₂ O ₃ spinel was used. Further, as the adhesive, a sheet-like adhesive prepared by adding a binder, a plasticizer, a solvent, and the like to La _1-X Ca _X CrO ₃ powder is used, and this sheet is applied to the contact surface of the intermediate material with the member to be joined. It was used by sticking.

The joining process is performed at a temperature of 1400 ° C. and a pressure of 1 M.
The test was performed in an air atmosphere under the condition of Pa.

As a result of the four-point bending test of the obtained joined body, 1
It was confirmed that the strength in an air atmosphere at 000 ° C. was as high as 84 MPa.

[0031]

As described in detail above, according to the method for joining ceramic members of the present invention, even if the joined surface is a non-smooth member to be joined, it can be easily machined without performing machining for smoothing. To form a bonded body having extremely high bonding strength and excellent sealing performance against gas and liquid at the bonded portion.

The method of the present invention can reduce the cost by reducing the machining and provide a joining method which can be sufficiently applied to the joining of members having complicated shapes. The industrial utility is extremely large.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view illustrating one embodiment of a method for joining ceramic members according to the present invention.

FIG. 2 is a sectional view for explaining one embodiment of a method for joining ceramic members according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1, 2 Member to be joined 3 Intermediate material 4 Adhesive 10 Joined body

 ──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-60-131874 (JP, A) JP-A-60-240351 (JP, A) JP-A-61-199587 (JP, A) Edited by Kenya Hamano, "Fine Ceramics Handbook", Asakura Shoten, (1984) 254-256.

Claims (1)

(57) [Claims] 1. A method of joining a ceramic member and a ceramic member by contacting and heating the ceramic member via an intermediate material, wherein the intermediate material is more easily deformed than a member to be joined at a joining temperature as an intermediate material. A method for joining ceramic members, characterized by using a ceramic material that deforms at the joining temperature according to the shape of the joint surface of the member to be joined.