JPH08206875A - Joined body - Google Patents

Abstract

PURPOSE: To obtain a high-strength joined body by incorporating a prescribed range of Cu into the aluminum base phase in a joining layer in case of joining members at least either of which consist of Al or Al alloy via this joining layer. CONSTITUTION: The member 2 consisting of the Al or Al alloy is joined via the joining layer 4 to the other member 3. The other member 3 is an Al or Al alloy member, member of another different material or ceramic member. The Cu is incorporated at 0.5 to 4.8wt.% into the aluminum base phase 5 in the joining layer 4. The joining layer 4 consists mainly of the Al alloy and the prescribed amt. of the Cu to be incorporated into the aluminum base phase 5 in the joining layer 4 may be previously incorporated into a brazing filler metal or may be supplied by the diffusion from the Al alloy member or may be supplied by previously forming a Cu film by a method, such as plating, vapor depositing or sputtering, on the surface of other different materials or the Al or Al alloy member in the case of joining by a brazing filler metal.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a joined body in which aluminum (Al) or aluminum alloy (Al alloy) members are joined to each other, or members made of other different materials, mainly for industrial parts and structures. The present invention relates to a joined body used as a component.

[0002]

2. Description of the Related Art When joining members made of Al or Al alloy, or members made of other dissimilar materials with a brazing material, an Al-Si eutectic composition (for example JIS BA4045) is used as a two-component brazing material. ), Or as a three-component brazing material such as JISBA4145 or Al-Ge-Si, Al-Si-Mg, etc. in which 4 wt% of Cu is added to Al-Si eutectic to lower the melting point to some extent. An alloy type brazing material is used.

[0003]

However, in the joined body joined using the brazing filler metal of the three-component system, since these brazing filler metals contain several% of alloying elements in order to attain a low melting point,
An intermetallic compound (phase) is generated in the joining layer (alloy brazing material) which is the joint between both members. If the amount of the intermetallic compound is larger than the predetermined amount, the yield strength will be high, but if it is too high, it will be brittle. The brittleness was a problem even in a joined body of Al or Al alloy members, but in particular,
This was remarkable in a joined body in which Al or Al alloy members were joined to each other by members made of different materials with a brazing material. For example, in the case of a joined body that is joined to a low expansion material such as ceramics or cemented carbide, Al and these low expansion materials have large thermal expansion coefficients. Large thermal residual stress occurs in the joint layer, which is the joint portion. As a result, it was very likely that the stress would cause the fracture from the intermetallic compound phase. On the other hand, in a joined body joined with an Al-Si binary eutectic brazing material such as JIS BA4045, an intermetallic compound (phase) is hard to be generated in the joining layer which is the joint portion as described above, but Since the compound (phase) is less likely to be generated, since the yield strength of the joint layer that is the joint portion is low, the joint layer itself that is the joint portion yields before it breaks between the joint layer and the member to be joined, Only a low strength joint was obtained. Thus, conventionally, when joining members together, for example, in the case of joining with a brazing material, the state before joining, such as the composition of the brazing material, and the joining method have been sufficiently studied, but the joining layer Research and development regarding the state (composition, etc.) was insufficient. An object of the present invention is to provide a high-strength joined body in which members made of Al or Al alloy are joined or members made of other dissimilar materials are joined.

[0004]

As a result of various studies, the inventors of the present application have found that the strength of a bonded body, particularly the strength of a bonded layer, is
It was found that it depends on the amount of the intermetallic compound formed in the bonding layer, and the amount of the intermetallic compound is controlled by defining the Cu content of the aluminum matrix contained in the bonding layer. I have found a way to do it. And
The first means is a joined body in which at least one member made of Al or an Al alloy is joined via a joining layer, and Cu is contained in the aluminum matrix in the joining layer with 0.5 to 4.8.
It is a bonded body containing wt%. The bonding layer is Al
It is preferably composed of an alloy. The second means is Al
A joined body in which a member or an Al alloy member and a member made of another dissimilar material are joined via a joining layer, and the aluminum mother phase in the joining layer contains 0.5 to 4.8% by weight of Cu. It is a joined body. The joining layer is preferably made of Al alloy. Here, the "other dissimilar material" means an Al member or Al.
It refers to a material different from the alloy member, for example, a ceramic material, a metal material such as steel, an iron-based material, titanium, or a titanium alloy, and an Al member or an Al alloy member having a different composition. The third means is A
A joined body in which a member made of 1 or an Al alloy and a ceramic member are joined via a joining layer, and the aluminum mother phase in the joining layer contains Cu in an amount of 0.5 to 4.8% by weight. It is the body. The joining layer is preferably made of Al alloy. The ceramic member is preferably a silicon nitride sintered body, a silicon carbide sintered body, a sialon sintered body, an alumina sintered body, a zirconia sintered body, or a composite material of these sintered bodies. If the content of Cu in the aluminum matrix of the joining layer is less than 0.5% by weight, the yield strength is insufficient and the effect of improving the strength is small. On the other hand, 4.8.
If it exceeds 5% by weight, the precipitation amount of the intermetallic compound Al ₂ Cu increases and brittleness increases, which is not preferable.

[0005]

By increasing the amount of Cu contained in the aluminum mother phase, the yield strength of the mother phase can be improved, and the brittle intermetallic compound phase can be generated while suppressing the formation of the brittle intermetallic compound phase. Obtainable.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION A bonded body of the present invention will be described (FIG. 1). In the present invention, at least one is Al or A
In the joined body 1 in which the member 2 made of the 1-alloy is joined via the joining layer 4, the aluminum matrix 5 in the joining layer 4 contains 0.5 to 4.8% by weight of Cu. The other member 3 is
They are Al or Al alloy members, members of other different materials, and ceramic members. The bonding layer 4 is mainly made of Al alloy,
A predetermined amount of Cu contained in the aluminum matrix 5 in the bonding layer 4 is
When joining with a brazing material, it may be contained in the brazing material in advance, or supplied by diffusion from an Al alloy member, or by plating, vapor deposition, sputtering, etc. on the surface of another dissimilar material or Al or Al alloy member. Alternatively, the Cu film may be formed by forming it in advance. In either method, it is sufficient that a predetermined amount of Cu is present in the aluminum matrix 5 of the joining layer (joint portion) 4 after joining shown in FIG. Further, even when other bonding methods such as direct bonding, solid phase diffusion bonding and hot pressing are used, a predetermined amount of Cu is added to the aluminum matrix 5 in the bonding layer 4.
Should be included. The method for measuring the content of Cu contained in the aluminum matrix 5 in the bonding layer 4 is 1
Aiming at the center of an aluminum matrix of 0 to 200 microns, EDX and ED attached to EPMA and SEM devices
It can be measured by performing point analysis by S and WDS.

-Experimental Example-As one member 2, an Al or Al alloy member (size:
20mm × 15mm × 10mm, material: JIS AC2
A, JIS A1050, JIS A2024, JIS
4 types of A7075) were prepared. As the other member 3, an Al or Al alloy member, a member made of another dissimilar material, or a ceramic member was prepared (size: 20 mm ×).
15 mm x 3 mm thick). Other members made of different materials include Si ₃ N ₄ sintered bodies, SiC sintered bodies, sialon sintered bodies, Al ₂ O ₃ sintered bodies, and ZrO ₂ sintered bodies as ceramic members.
S15C (JIS standard) was prepared as the type and carbon steel member. A metallized film was previously formed on the bonding surface of the ceramic member by a vapor deposition method. Two kinds of metallized films were prepared in order from the ceramic member 2, one having Ti 1000 angstrom / Mo 1000 angstrom / Ni 1000 angstrom and the other having only Al 2000 angstrom. The brazing material is JIS BA
4045 (Al-10% Si), BA4145 (Al-
10% Si-4% Cu), Al-27% Cu-5% S
i, Al-22% Cu-4% Si-20Zn, Al-1
Five kinds of 4% Cu-3% Si-50Zn were prepared. These were brazed with the combinations shown in Table 1 and Table 2 under the conditions described in the table. The strength of the obtained joined body 1 was measured by a shear test, the sample after breaking was cut perpendicularly to the joining surface, and the aluminum matrix 5 in the joining layer (joint portion) was cut using an EPMA apparatus. The Cu content was measured.

[0008]

[Table 1]

[0009]

[Table 2]

As can be seen from the results shown in the table, the bonded bodies (Nos. 3 to 10 and N of Examples) in which the Cu content is within the range of the present invention.
Nos. 16 to 22) have high strength irrespective of the kind of the joining member and the composition of the brazing material. On the other hand, the bonded bodies of Comparative Examples (Nos. 1-2 and N, which are outside the scope of the invention)
Nos. 11 to 15 and Nos. 23 to 25) were found to have low strength. Of these, No. 2, No. 11 to 13, N
In No. 15 and Nos. 23 to 25, the joining strength was low despite the combination of the joining members and the like similar to the examples. By controlling the joining temperature and time, the Cu content in the aluminum matrix 5 in the joining layer can be set to 0.5 to 4.8 wt% regardless of the type of joining member and the composition of the brazing material. It is possible to increase the bonding strength.

[0011]

The joined body of the present invention is made of Al or Al.
A joined body in which alloy members are joined to each other or members made of other dissimilar materials, which has appropriate proof stress and is a high-strength joined body. Further, the joined body of the present invention can be obtained by a simple method.

[Brief description of drawings]

FIG. 1 is a schematic view showing a cross section of a bonded body and a bonding layer thereof according to the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Bonded body 2 Al or Al alloy member 3 Al or Al alloy member, member of other dissimilar materials, ceramic member 4 Bonding layer 5 Aluminum mother layer 6 Precipitate (made of Si, Mg, Cu, etc.)

Claims (5)

[Claims] 1. A joined body, at least one of which is made of Al or an Al alloy, joined together through a joining layer, wherein Cu is contained in an aluminum matrix in the joining layer in an amount of 0.5 to 4.8% by weight.
A zygote characterized by being included. 2. A joined body obtained by joining an Al member or an Al alloy member and a member made of another dissimilar material via a joining layer,
A joined body, wherein the aluminum mother phase in the joining layer contains 0.5 to 4.8% by weight of Cu. 3. A joined body in which a member made of Al or an Al alloy and a ceramic member are joined via a joining layer, and Cu is contained in the aluminum matrix in the joining layer in an amount of 0.5 to 4.8.
A joined body characterized by being contained in a weight percentage. 4. The bonded body according to claim 1, wherein the bonding layer is made of an Al alloy. 5. The ceramic member is any one of a silicon nitride sintered body, a silicon carbide sintered body, a sialon sintered body, an alumina sintered body, a zirconia sintered body, or a composite material of these sintered bodies. Claim 3 or 4 characterized by the above.
The described conjugate.