JP3154361B2 - Solid phase diffusion bonding method and material of particle dispersed composite member - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to solid-phase diffusion in which a particle-dispersed composite member is brought into contact with each other, an insert material is interposed therebetween, and pressure and heat are applied to the joint surface to join in a solid state. The present invention relates to a joining method and materials joined by the method.

[0002]

2. Description of the Related Art As a method of joining members in a solid state, there is a method of joining members by using a solder, silver, brass, copper, or the like, and by using a physical adhesive force or a chemical bonding force. is there. Also, using a member having a fine grain structure, the surface to be joined of this member is finished with high precision,
There is a method in which pressure and heat are applied to these joining surfaces to join them in a solid phase. This bonding method is generally called diffusion bonding, and the procedure is shown in FIG. That is, the members A and B to be joined are made of a metal material, have a fine crystal grain size of 1 μm or less, and have a ten-point average roughness of 0.1 to 0.2 μm in ten-point average roughness.
m is required to be finished and clean. Then, these joining members A and B are connected to pressing jigs 1 and 2.
Are joined under a predetermined pressure P while heating to a predetermined temperature in a vacuum in the vacuum vessel 3 for about 7.2 to 18 ks. In addition, 4 is a heater for heating, and 5 is an oil seal. Further, as another method of the solid-phase diffusion bonding, as shown in FIG. 6, an insert material 10 such as a foil-like metal is sandwiched between the bonding members, and pressure and heat are applied in the same manner as described above, so that the bonding members are separated from each other. There is a method of bonding by reacting with the inserted metal.

[0003]

The above-mentioned method by brazing or the like has a low joining strength and does not come out of a simple joining area, and is not suitable for use as a structural member. On the other hand, the method shown in FIG. 5 enables joining while minimizing the deformation of the member and has excellent joint strength. However, the joining condition requires that the crystal grain size of the member be 1 μm or less as described above. However, there are disadvantages in that the finishing accuracy of the joining surface is high, the atmosphere is vacuum, and the joining time takes 7.2 ks or more. In addition, the method of interposing the insert material does not require the structure required for the joining member as in the case of the method shown in FIG.
It is possible to join even a composite member such as a fiber reinforced metal (hereinafter, referred to as FRM) or a particle dispersion reinforced metal (hereinafter, referred to as PRM), which is difficult to join. The finishing accuracy of the joint surface may be 10 μm or less in terms of ten-point average roughness. However, there are cases where the insert material and the components of the joining member diffuse into each other near the joining interface to form a brittle alloy layer.

In addition, when a joining member made of PRM is joined, as shown in FIG. 3, the composite particles sometimes form an aggregated layer at the joining interface. This particle aggregation layer is made according to JIS AC
PRM composed of 8AAl alloy and 10% SiC particles
With a 50μm-thick Cu insert, 803
It was formed when the temperature of K was applied for 3.6 ks. This is presumably because the Al alloy matrix was reactively alloyed with the insert material Cu in the vicinity of the bonding interface to lower the melting point and partially melt. This cohesive layer is expected to be formed in a temperature range from 803K or higher until the AC8A alloy melts and diffusion bonding in the solid phase cannot be performed. Further, it can be easily expected that a similar particle aggregation layer is formed in a certain temperature range also in a PRM using another alloy as a matrix. Since the physical properties such as hardness, toughness, elongation, and coefficient of thermal expansion of this particle agglomeration layer are different from those of other parts, stress and thermal stress tend to concentrate and become a starting point of fracture, which is not preferable. Furthermore, in this method, the insert material may remain in a layer form. That is,
When the temperature of 783 K is applied for 3.6 ks using the PRM and the Cu insert, the Cu insert may remain in a layered state as shown in FIG. 4, although both sides are alloyed. This is probably because the insert material could not be sufficiently diffused and remained because the heating temperature was low or the heating time was short. Even when the insert material remains in this way, the joining strength is low, which is not preferable. The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a solid-phase diffusion bonding method of a particle-dispersed composite member that solves the above-mentioned problems, and a material thereof.

[0005]

According to the above object, according to the present invention, there is provided a method of joining particles dispersed composite members in a solid phase with an insert made of an aluminum alloy as a matrix. Using Cu foil or Zn foil, temperature range 786-790K, pressurization time 0.6-10.0ks,
A solid phase diffusion bonding method is used to eliminate the layer of the insert material remaining on the bonding surface by treating under a pressure of 0.1 to 100 MPa and to prevent agglomeration of the particles dispersed in the composite member at the bonding surface. In addition, the above problem has been solved by providing a material manufactured by the method. Thereby, in the solid phase joining of the PRM using the insert material, a good joining method and joining material can be obtained in which a particle aggregation layer is not formed at the joining interface and the insert material does not remain in a layer.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The joining member of the present invention uses a composite material in which particles are uniformly dispersed at a predetermined ratio, and the matrix of the composite material is JIS AC8A, AC8B, AC4.
Al alloys such as C and AC9B are targeted. The particles dispersed in this matrix mainly have a particle size of 0.1.
It is assumed that SiC particles of 1 to 30 μm are added in an amount of 0.1 to 30 mass%. Further, as other dispersed particles, Al
₂ O ₃ , BeO, Cr ₂ O ₃ , HgO, SiO ₂ , TiO ₂ ,
ZrO ₂ , TiC, B ₄ C, WC, C, BN, Si ₃ N ₄
Alternatively, these are combined. The insert material is mainly a pure Cu foil or a pure Zn foil having a thickness of 5 to 500 μm.

[0007] As for the joining procedure, processing is performed in the same manner using the apparatus shown in FIG. That is, PR using AC8A Al alloy as a matrix using Cu insert material
When solid phase diffusion bonding is performed on M, the temperature range to be treated is 786 to 790K, and the heating time is 0.6 to 10.8k.
s When the treatment is performed at a temperature of 786K or lower, for example, at a temperature of 783K, the Cu insert material remains in a layer at the joint interface of the joint member as shown in FIG. Further, when the treatment is performed at a temperature of 790 K or more, for example, 798 to 823 K, the Cu insert material does not remain, but a particle aggregation layer is formed at the joint interface as shown in FIG. 3, which is not preferable. Thus, in the temperature range of 786 to 790K,
Almost no residual Cu insert material or particle aggregation layer is observed, and a uniform structure is obtained as shown in FIG. If the heating time is 0.6 ks or less, the desired effect cannot be obtained.
There is no need for heating for more than 0.8 ks. Further, the applied pressure is 0.1 to 100 MPa, preferably 1 to 10 M
Pa. No effect is obtained below 0.1MPa.
There is no need to apply a pressure of 00 MPa or more, which may cause deformation.

Concrete Example 1 SiC particles having a diameter of 5 μm were added to a JIS AC8A alloy.
Mass% added composite material (PRM) is φ
The piece was processed into a piece of 20 × 30 mm, and the joint surface was polished and finished with No. 280 emery paper. After degreased with hexane, a pure Cu foil having a thickness of 50 μm was sandwiched as an insert material, and a temperature of about 788 K and a pressure of about 1 MPa were applied for 7.2 ks in a vacuum atmosphere of about 1 × 10 ⁻² Pa. This allowed the two to join, and all the Cu inserts were diffused and absorbed into the composite matrix. Also, almost no SiC particle aggregation layer was formed. FIG. 1 shows the metal structure of the cross section of the joint. Example 2 A 5 μm-diameter SiC particle was added to a JIS AC8A alloy.
Mass% added composite material (PRM) is φ
The piece was processed into a piece of 20 × 30 mm, and the joint surface was polished and finished with No. 280 emery paper. After these were degreased with hexane, a pure Zn foil having a thickness of 100 μm was sandwiched as an insert material, and a temperature of about 788 K and a pressure of about 1 MPa were applied for 3.6 ks in a vacuum atmosphere of about 1 × 10 ⁻² Pa. This allowed the two to be joined and all the Zn inserts were diffused and absorbed into the composite matrix. Also, almost no SiC particle aggregation layer was formed.

FIG. 2 shows the hardness distribution of the joining members (S1 and S3) having the joining interface shown in FIGS. 1 and 3 across the joining interface. According to this, it can be seen that the hardness and distribution of the hardness of the joining member of S3 are large, whereas the distribution and change of the hardness of S1 are small and the uniformity of hardness is considerably improved. It is also assumed that the uniformity of other physical properties such as toughness, elongation, and coefficient of thermal expansion has been improved, and that the concentration of stress and thermal stress has been reduced.

[0010]

According to the present invention, when a particle-dispersed composite member having an Al alloy as a matrix is joined in a solid state with an insert material interposed, the insert material does not remain at the joint boundary. In addition, the boundary of the joint can be unclear without causing particle aggregation. Therefore, a particle-dispersed composite member having continuous properties such as hardness, toughness, elongation, and thermal expansion coefficient can be joined in a solid phase.

[Brief description of the drawings]

FIG. 1 is a photograph replacing a drawing showing a metal structure of a bonded cross section of a particle-dispersed composite member bonded by a method of the present invention.

FIG. 2 is an explanatory view showing a comparison between hardness distributions of a joint member joined by the present invention and a joint member joined by a conventional method.

FIG. 3 is a photograph instead of a drawing showing a metal structure of a bonded cross section of a particle-dispersed composite member bonded by a conventional method.

FIG. 4 is a photograph instead of a drawing showing a metal structure of another bonded cross section of a particle-dispersed composite member bonded by a conventional method.

FIG. 5 is a diagram for explaining the outline of the solid-state joining method.

FIG. 6 is a diagram for explaining the outline of another solid-state joining method.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Jig 2 Jig 3 Vacuum container 10 Insert material A Joining member B Joining member

Claims (3)

(57) [Claims] When a particle-dispersed composite member using an Al alloy as a matrix is joined in a solid state with an insert material interposed, a Cu foil or a Zn foil is used for the insert material, and a temperature range of 786 to 790K, pressurization time 0.6-1
By treating under the conditions of 0.8 ks and a pressure of 0.1 to 100 MPa, it is possible to eliminate the layer of the insert material remaining on the joint surface and to prevent the particles dispersed in the composite member from agglomerating on the joint surface. Characterized by solid phase diffusion bonding. 2. The matrix of a particle-dispersed composite member has JI
The solid-state diffusion bonding method according to claim 1, wherein alloys of SAC8A, AC8B, AC4C, and AC9B are used. 3. There is no residual layer of the insert material on the joining surface,
A particle-dispersed composite material produced by the method according to claim 1, wherein the composite material has no aggregated layer of particles.