JPH09142948A - Method for joining ceramic structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To ensure superior bonding strength by heating a face of a ceramic structure to be joined to a specified temp. or above, bringing an Al material into contact with the heated face, putting other ceramic structure on the Al material and joining them by heating. SOLUTION: A ceramic structure such as a cylindrical AlN structure 1 having a prescribed diameter and a prescribed length is held by a mold and kept at >=600 deg.C for about 30min in a heating furnace and an Al sheet 2 having a slightly smaller area than the cross-sectional area of the structure 1 and about 1mm thickness is put on the structure 1. The structure 1 is then passed in the held state through a heating furnace at 660-700 deg.C in about 3min to partially melt the surface of the Al sheet 2. Other ceramic structure such as a cylindrical Al2 O3 structure 3 is put on the Al sheet 2 at the outside of the furnace, >=2g/mm<2> , especially about 10g/mm<2> pressure is applied with a press to break an oxidized film on the surface of the Al sheet and both the ceramic structures are joined to obtain a tight ceramic joined body.

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 structures, and more specifically, it is characterized by joining ceramic structures through an aluminum material by a simple method.

[0002]

2. Description of the Related Art Conventionally, when joining ceramic members as a ceramic structure or joining other forms of material to the ceramic members, various brazing materials have been used for joining. For example, in Japanese Unexamined Patent Publication No. 58-74544, "Joining Structure and Manufacturing Method Thereof", a pair of members to be joined are polymerized and heated through a metal brazing material whose surface is covered with glass to heat a metal other than the metal. It discloses that glass and ceramics can also be joined.

Further, in JP-A-61-286059, "Method of Joining Aluminum Alloy and Alumina Ceramics", a metal layer such as Mo is formed on alumina ceramics, and an Al metal layer single layer is formed thereon. After that, a method of performing a brazing process to integrate them is disclosed.

[0004]

As described above, since the conventional metal brazing material has a weak bonding strength with only a single composition, it is necessary to cover the periphery of these metals with glass or to combine them with the action of other metal layers. I tried to improve the bonding strength. Therefore, there is a drawback that the cost becomes high.

An object of the present invention is to provide a novel joining method capable of joining two kinds of structures by pressure joining a single metal material under specific conditions.

[0006]

Means for Solving the Problems The inventors of the present invention have conducted diligent research to solve such problems, and found that the use of the melting region of an aluminum material enables a simple method for bonding. Inventive methods could be provided.

That is, according to the present invention, the first step of heating the surfaces to be joined of the plurality of ceramic structures to 660 ° C. or higher, and then the aluminum material is brought into contact with the surfaces of the one heated ceramic structure to contact. After that, a second step of mounting another ceramic structure and then heating and bonding the ceramic structure is performed. The present invention also provides a first step of heating the surfaces of the ceramic structure to be joined to 660 ° C. or higher, and then contacting the heated surfaces to be joined with an aluminum material so that the contact surface of the aluminum material is As the part dissolves,
And a second step in which the surface of the aluminum material is partially melted, and then another ceramic structure is brought into contact with this surface to perform pressure bonding. , The pressure bonding is 2 g /
It is preferable to apply a pressure of mm ² or more.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION The ceramic structure used in the present invention may be a structure of any shape such as an alumina columnar material or an AlN prismatic material, but the bonding surface of the structure is heated to 660 ° C. or higher. Therefore, a structure other than the above may be used as long as the material can withstand the temperature or higher.

The surface of the structure is heated to a temperature of 660 ° C. or higher in order to melt the contact surface of the aluminum material as the metal plate to be joined, which is because the melting point of aluminum is 660 ° C. ( First step).

The aluminum material is brought into contact with the heated ceramics structure immediately after the ceramics structure comes out of the heating furnace, for the purpose of preventing the temperature of the surface of the ceramics structure from decreasing.

Then, while keeping the aluminum plate in contact with the surface of the ceramic structure, the ceramic structure was charged again into the heating furnace and 6
Part of the surface of the aluminum plate is melted at 80 ° C.

This temperature control is preferably in the range of 660 ° C to 700 ° C. This is because the aluminum plate does not melt at 660 ° C. or lower and the melting rate progresses at 700 ° C. or higher, which makes the subsequent pressure bonding operation difficult.

Next, the other ceramic structure is brought into contact with the surface of the aluminum plate, and 2 g / mm
^Two or more pressures are applied to bond, but in this case, the molten aluminum forms an oxide film by air oxidation, so
A pressure is applied to break the oxide film so that the pure aluminum portion comes into contact with the oxide film (second step).

In another embodiment, a joined body can be obtained in the same manner as described above by heating a plurality of ceramic structures to 660 ° C. or more and then performing pressure joining with an aluminum plate interposed. . In this case, the pressure required for joining the structures may be ² g / mm ² or more with a normal press, but in this example, a pressure of 10 g / mm ² was applied in order to obtain a preferable joined body.

In addition, the surface of the ceramic structure is
As a means for heating to 60 ° C. or higher, in addition to using the heating furnace as described above, heating can also be performed by using a movable burner or the like on the surface of the fixed ceramic structure.

[0016]

EXAMPLES The method of the present invention will be described in detail below with reference to examples, but the scope of the method of the present invention is not limited to these.

(Embodiment 1) A cylindrical structure 1 made of AlN having a diameter of 50 mm (diameter 50 mm)
× length 100 mm) is held in the mold and 85 in a heating furnace
30mm x 30mm x 30mm at a constant temperature of 0 ℃
The aluminum plate 2 having a size of 40 mm and a thickness of 1 mm was brought into contact.

Next, the AlN columnar body structure 1 is again passed through the heating furnace for about 3 minutes while being held in the mold to melt the surface of the aluminum plate, and then outside the furnace, the other ceramic structure body is used. A certain alumina columnar structure 3 (diameter 5
(0 mm × 30 mm in length) was contacted, a pressure of 10 g / mm ² was applied by a normal press to break the oxide film on the surface of the aluminum material, and both ceramic structures 1 and 3 were bonded.

(Embodiment 2) As shown in FIG. 2, a 70 mm square prismatic structure 4 made of alumina and a cylindrical structure 3 made of alumina having a diameter of 40 mm and a length of 60 mm are respectively formed as ceramic structures. It was held in a frame (not shown) and held in a heating furnace at a constant temperature of 850 ° C. for 30 minutes (first step).

Next, after the aluminum plate 2 of 60 × 60 × 40 mm in thickness is brought into contact with one surface of the heated alumina prismatic structure 4, the alumina cylindrical structure 3 is immediately attached as shown in FIG. Placed on the surface of the aluminum plate,
A pressure of 10 g / mm ² was applied to bond by heating (second step).

By this pressure, the pure parts of the aluminum plates were melted and the above ceramic structures could be joined together.

[0022]

As described above, the present invention is a joining method by a simple method as described above, but the strength after joining is equivalent to the case of using a conventional brazing filler metal, and the production cost is significantly reduced as compared with the conventional method. Has an effect that can contribute to.

[Brief description of the drawings]

FIG. 1 is a schematic diagram showing one embodiment of the present invention.

FIG. 2 is an explanatory view of the method of the present invention.

FIG. 3 is an explanatory view of the method of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 AlN cylindrical structure 2 Aluminum plate 3 Alumina cylindrical structure 4 Alumina prismatic structure

Claims (3)

[Claims] 1. A first step of heating the surfaces to be joined of a plurality of ceramic structures to 660 ° C. or higher, and then contacting an aluminum material with the surfaces to be contacted of one of the heated ceramic structures, And a second step of mounting another ceramic structure and heat-bonding the ceramic structure. 2. The surface to be joined of the ceramic structure is 6
The first step of heating to 60 ° C. or higher, and then contacting the heated surfaces to be joined with an aluminum material to partially melt the contact surface of the aluminum material and further partially melt the surface of the aluminum material. Then, a second step of bringing another ceramic structure into contact with this surface to perform pressure bonding, and a method for bonding a ceramic structure. 3. The method for joining a ceramic structure according to claim 1, wherein the pressure joining is performed by applying a pressure of ² g / mm ² or more.