JP2016187811A - Joined body of aluminum member, and joining method of the aluminum member - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a joined body of an aluminum member which can suppress an increase in connection resistance with time caused by oxidation of a joined part, and achieves high joining strength between aluminum members and low connection resistance.SOLUTION: In a joined body 10 of aluminum members, a first aluminum member 11 and a second aluminum member 12, of which a major component is aluminum, are joined through a joint material 15 containing a plurality of metal particles 13, of which a major component is zinc, and resin 14, and are electrically connected through the metal particles 13. An alloy layer 16 (16a, 16b) containing zinc and aluminum is formed on joined parts J1, J2 of the first and second aluminum members 11, 12 and the metal particles 13.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an aluminum member joined body and an aluminum member joining method, and more specifically, aluminum members joined by a joining material containing metal particles and a resin, and aluminum members joined together with metal particles. The present invention relates to a method of bonding with a bonding material containing a resin.

  In the case of joining members containing aluminum, there is a method of joining by using zinc which causes a eutectic reaction with aluminum as a joining material.

  As one of such methods, Patent Document 1 discloses that an insert material containing zinc as an element that causes a eutectic reaction with aluminum is interposed between members made of an aluminum-based metal. In a pressurized state, the mixture is heated to a temperature at which a eutectic reaction occurs to form a melt by the eutectic reaction with aluminum in the base material at the joint interface between the two materials. An aluminum-based metal joining method in which members made of an aluminum-based metal are joined to each other through a step of discharging the oxide film from the joining interface is disclosed.

  And according to the method of this patent document 1, since the insert material which contains at least zinc is interposed between the members which consist of an aluminum-type metal material, it presses and heats zinc between base material aluminum. Eutectic melting with low melting point occurs, and it is possible to join at low temperature, low heat input, low distortion, low cost without using flux in the atmosphere, and deformation and strength reduction of the joined members In addition to preventing this, it is said that the thermal influence on the peripheral members can be minimized.

  However, in the joined body joined by the method disclosed in Patent Document 1, a part of the connecting portion including zinc or a eutectic alloy of zinc and aluminum is exposed to the atmosphere, so that the jointed body with time passes. There is a problem in that the connection portion containing a crystal alloy or the like is oxidized by the atmosphere, resulting in an increase in connection resistance and strength deterioration.

  On the other hand, when bonding external electrodes of electronic components to wiring electrodes of a circuit board, there is a method of bonding using an anisotropic conductive resin in which conductive particles are dispersed in a resin as a bonding material.

  As one of such methods, Patent Document 2 discloses that an insulating adhesive layer is disposed on both surfaces of an insulating core film disposed at the center in the thickness direction, and one of the conductive fine particles. Wiring (electrodes) provided on one substrate and wiring (electrodes) provided on the other substrate using an anisotropic conductive adhesive sheet in which a part or all is present in the core film (resin film) ) Is disclosed (see FIG. 6 of Patent Document 2).

  And in the joined body produced by the method of Patent Document 2, one substrate and the other substrate are connected by an adhesive layer provided in the anisotropic conductive adhesive sheet, and the adhesive force by this adhesive layer is used. The conductive fine particles are pressed against the wiring (electrode) on one and the other substrate, and the wiring (electrode) provided on the one substrate is electrically connected to the wiring (electrode) provided on the other substrate. Will be.

International Publication Number WO2012 / 029789 JP 2007-253629 A

  However, in the joined body produced by the method of Patent Document 2, one wiring (electrode) and the other wiring (electrode) depend on contact between the conductive fine particles and one and the other wiring (electrode). Therefore, there is a problem in that sufficient electrical connection cannot always be obtained, and in some cases, connection resistance increases.

  In the method of Patent Document 2, particularly when the material constituting the wiring (electrode) is aluminum, a strong aluminum oxide film formed on the surface of the wiring (electrode) contacts the conductive fine particles. Therefore, there is a problem that it is difficult to obtain sufficient conduction.

  The present invention solves the above-described problems, can suppress an increase in connection resistance over time due to oxidation of the joint, and has a high joint strength between the aluminum members, and the connection It is an object of the present invention to provide a joined body of aluminum members having low resistance and a joining method of aluminum members capable of reliably obtaining such a joined body.

In order to solve the above problems, the joined body of the aluminum member of the present invention is:
The first aluminum member and the second aluminum member, the main component of which are aluminum, are bonded together via a bonding material containing a plurality of metal particles whose main component is zinc and a resin, and the metal particles A joined body of aluminum members electrically connected via,
An alloy layer containing zinc and aluminum is formed at least at a joint portion between the first and second aluminum members and the metal particles.

  In the joined body of aluminum members of the present invention, the resin is preferably a thermoplastic resin.

  Since the thermoplastic resin is softened by heating to have various shapes, it can be preferably used as a resin constituting the joined body of the aluminum member of the present invention.

  In the joined aluminum member of the present invention, it is preferable to use a polyimide resin as the thermoplastic resin.

Since polyimide resin (thermoplastic polyimide) is difficult to be thermally decomposed even at high temperatures, the use of thermoplastic polyimide as the resin constituting the bonding material of the present invention provides a bonded portion with less voids due to generation of decomposition gas. be able to.
In addition, it is more preferable to use a thermoplastic polyimide that does not contain an organic solvent, because generation of voids due to vapor generated by evaporation of the organic solvent can be prevented.

Moreover, in order to solve the said subject, the joining method of the aluminum member of this invention is the following.
A method of joining a first aluminum member and a second aluminum member, the main component of which is aluminum,
In a state where a bonding material including a plurality of metal particles mainly composed of zinc and a thermoplastic resin is positioned between the first aluminum member and the second aluminum member, the first aluminum member And a step of heating to a temperature at which at least a part of the metal particles melts while the thermoplastic resin softens while applying pressure so that one of the second aluminum members is pressed toward the other. Then, while joining the 1st aluminum member and the 2nd aluminum member with the thermoplastic resin, zinc and aluminum are made into the contact part of the 1st and 2nd aluminum members, and the metal particles. It is characterized in that the first and second aluminum members and the metal particles are joined by generating an alloy layer containing the alloy layer. The

  Moreover, in the joining method of the aluminum member of this invention, it is preferable to use a polyimide resin as said thermoplastic resin.

When a thermoplastic polyimide is used as the thermoplastic resin constituting the bonding material, the thermoplastic polyimide is difficult to be thermally decomposed even in a high temperature state, so that it is possible to obtain a bonded portion with few voids due to generation of decomposition gas.
In addition, when thermoplastic polyimide which does not contain an organic solvent is used, it is possible to prevent generation of voids due to evaporation of the organic solvent, which is more preferable.

Further, the bonding material is a bonding material comprising a resin sheet obtained by molding the thermoplastic resin into a sheet shape, and a plurality of the metal particles positioned on at least one of the front and back main surfaces of the resin sheet,
While applying pressure so that one of the first aluminum member and the second aluminum member is pressed toward the other, the resin softens and reaches a temperature at which at least a part of the metal particles melts. Through the heating step, the metal particles are embedded in the resin sheet, and zinc and aluminum are put into contact portions between the first and second aluminum members and the metal particles embedded in the thermoplastic resin. It is preferable to produce a containing alloy layer.

In the bonding method of the present invention, for example, a resin sheet and metal particles are prepared separately, and the metal particles are appropriately supplied to either one or both of the front and back main surfaces of the resin sheet, and this is used as a bonding material. It is also possible to configure as follows.
In the case of such a configuration, a process for producing a bonding material in which metal particles are dispersed in a thermoplastic resin is not necessary.
In supplying the metal particles to either one or both of the front and back main surfaces of the resin sheet, for example, the resin sheet is provided with adhesiveness, and the metal particles are surely attached to the upper surface side of the resin sheet or It can also be configured to be held on the lower surface side.
In any case, there is no particular restriction on the method of positioning the metal particles on at least one of the front and back main surfaces of the resin sheet.

The joined body of the aluminum member of the present invention is configured as described above, and the first and second aluminum members and the metal particles are formed through an alloy layer containing zinc and aluminum formed at the joined portion. Since the first aluminum member and the second aluminum member are securely bonded by the resin while being firmly bonded, a bonded body with high bonding reliability can be obtained.
At the same time, the first and second aluminum members and the metal particles are electrically and reliably connected by the alloy layer formed at the joint between the first and second aluminum members and the metal particles, and the first Since the aluminum member and the second aluminum member are securely joined by the resin, the connecting portion is kept in a stable state, so that a joined body with high conduction reliability can be obtained.
Furthermore, since the metal particles are dispersed in the resin, the metal particles are not exposed to the atmosphere and oxidized, and an increase in connection resistance over time can be suppressed.

  According to the method for joining aluminum members of the present invention, the thermoplastic resin softens while applying pressure so that one of the first aluminum member and the second aluminum member is pressed toward the other, and at least one of the metal particles. The first and second aluminum members are joined to each other by a thermoplastic resin through a process of heating up to a temperature at which the parts melt, and zinc and aluminum are in contact with the first and second aluminum members and the metal particles. Therefore, a bonded body having high bonding strength and high conduction reliability can be obtained.

It is a figure which shows typically the cross section of the joined body of the aluminum member concerning one Embodiment (Embodiment 1) of this invention. It is a figure for demonstrating the joining method of the aluminum member concerning Embodiment 1 of this invention, (a) is the state before press heating, (b) is the state after implementing a 1st press heating process, ( (c) is a figure which shows the state after implementing a 2nd press heating process. It is a figure explaining the joining method of the aluminum member concerning other embodiment (Embodiment 2) of this invention.

  Hereinafter, the present invention will be described in more detail with reference to embodiments of the present invention.

[Embodiment 1]
FIG. 1 is a view showing a joined body of aluminum members according to Embodiment 1 of the present invention. In an aluminum member joined body 10 shown in FIG. 1, a first aluminum member 11 and a second aluminum member 12 include a plurality of metal particles 13 mainly composed of zinc and a resin 14 having adhesiveness. This is a joined body having a structure joined by the material 15.

The 1st and 2nd aluminum members 11 and 12 are members which have aluminum as a main component, for example, are members which consist of a metal whose aluminum purity is 99% or more.
There is no special restriction | limiting in the aspect of the aluminum members 11 and 12, and various forms, such as film | membrane form, plate shape, strip | belt shape, and linear form, may be sufficient.
Specifically, for example, a lead terminal for power supply, a terminal formed on a metal case, or a wiring electrode formed on a circuit board is the aluminum member in the present invention. In addition, the purity and additive of the 1st and 2nd aluminum members 11 and 12 may be the same, and may differ.

The resin 14 constituting the bonding material 15 is a resin having adhesiveness, heat resistance, and insulation, and mechanically bonds the first aluminum member 11 and the second aluminum member 12 together.
In this embodiment, a thermoplastic polyimide that does not contain an organic solvent is used as the resin 14.

  The metal particles 13 included in the bonding material 15 are present in a dispersed state in the resin 14 described above. As the metal particles 13 containing zinc as a main component, zinc containing no additive, an aluminum-zinc alloy, a tin-zinc alloy, or the like can be used. Here, “having zinc as a main component” is not limited to the case where zinc is the component with the largest component ratio (wt%) of the total components of the metal particles, but the total components of the metal particles. The component ratio may be the second or subsequent component. However, “having zinc as a main component” does not include the case where zinc is contained as an impurity.

  The aluminum contained in the aluminum 11 and 12 and the zinc contained in the metal particles 13 are alloyed at the joints J1 and J2 between the first and second aluminum members 11 and 12 and the metal particles 13 containing zinc. The alloy layer 16 (16a, 16b) formed by this is formed.

In the joined body 10 of this embodiment, the first and second aluminum members 11 and 12 and the metal particles 13 are made of an alloy layer 16 (16a) containing zinc and aluminum formed at the joints J1 and J2. , 16b).
Further, the first aluminum member 11 and the second aluminum member 12 are firmly joined to the main body 13a of the metal particles 13 via the alloy layer 16 (16a, 16b) described above. Connected securely.
Furthermore, the 1st aluminum member 11 and the 2nd aluminum member 12 are mechanically connected also by resin 14 which has adhesiveness.
In the joined body 10 of this embodiment, the metal particles 13 are dispersed in the resin 14, and the alloy layers 16 (16 a, 16 b) are also present in the resin 14. Therefore, the metal particles 13 and the alloy layers 16 (16a, 16b) are not oxidized when exposed to the atmosphere, and increase in connection resistance with time can be suppressed.

  Next, a method for joining aluminum members (a method for forming the above-described joined body of aluminum members) will be described with reference to FIGS.

In explaining the joining method of the aluminum member, first, the joining material used in this embodiment will be explained.
In the first embodiment, as shown in FIG. 2A, as a bonding material, a liquid resin in which metal particles are dispersed is poured into a mold and solidified, whereby the metal particles 13 are contained in the resin 14. A dispersed sheet-like bonding material 15 is produced.
As the resin 14, a thermoplastic polyimide containing no organic solvent is used. In this embodiment, the thickness of the bonding material 15 is 25 μm.

  Further, as the metal particles 13, substantially spherical zinc particles mainly composed of zinc are used. The diameter of the metal particles 13 is smaller than the thickness dimension of the bonding material 15 and is, for example, 5 μm to 20 μm. Note that the metal particles 13 are not limited to spherical particles, and polyhedrons, particles having protrusions on the sphere surface, and the like can also be used.

  In joining the first aluminum member 11 and the second aluminum member 12, first, as shown in FIG. 2A, a sheet-like joining material 15 in which metal particles 13 are dispersed in a resin 14 is used. The first aluminum member 11 and the second aluminum member 12 are positioned.

  Next, it pressurizes using the pressing jigs 21 and 22 provided with the heating means so that one of the 1st aluminum member 11 and the 2nd aluminum member 12 may be pressed toward the other at normal temperature. The pressure is, for example, 5 MPa to 20 MPa. Since the bonding material 15 is in a hard state at room temperature, the thickness and shape are hardly deformed even when pressed.

Next, heating is performed in the pressed state. (FIG. 2B: first pressing heating step).
As the heating method, a pulse heat method excellent in responsiveness of heating and heat removal is adopted. It is also possible to employ a laser heating method.

  The heating temperature is, for example, 150 ° C to 300 ° C. By this heating, the resin (thermoplastic polyimide) 14 constituting the bonding material 15 is softened. A thermoplastic polyimide having a glass transition temperature of about 250 ° C. is softened by heating to a temperature exceeding 250 ° C. (280 ° C. in this embodiment).

The bonding material 15 located between the first and second aluminum members 11 and 12 is softened in a pressurized state, so that the thickness of about 25 μm before the pressure heating is reduced to about 20 μm. Become.
And since the thickness of the joining material 15 becomes thin and the space | interval of the 1st aluminum member 11 and the 2nd aluminum member 12 becomes small, the aluminum members 11 and 12 and the metal particle 13 in the joining material 15 become. Abut.

The melting point of zinc, which is the material constituting the metal particles 13, is about 420 ° C., the melting point of aluminum, which is the material constituting the aluminum members 11 and 12, is about 660 ° C., and the eutectic reaction temperature between zinc and aluminum is about 381 ° C. Therefore, in the first press heating process, the metal particles 13 and the aluminum members 11 and 12 remain in a solid state and do not melt.
Moreover, in the state after passing through this first pressing and heating step, the metal particles 13 and the aluminum members 11 and 12 are only in contact with each other, and the connection resistance (electric resistance) is in a high state.

  Next, heating is performed until the aluminum and zinc are melted in the contact portions C1 and C2 of the first and second aluminum members 11 and 12 and the metal particles 13 (FIG. 2C: second press heating step). ).

Specifically, the heating temperature is raised to 400 to 500 ° C. Thereby, in the said contact part C1, C2, the zinc contained in the metal particle 13 and the aluminum contained in the aluminum members 11 and 12 melt and mix.
In addition, although the oxide film is normally formed in the surface of the aluminum members 11 and 12 and the metal particle 13 containing zinc, an oxide film is destroyed by this 2nd press heating process, and the aluminum members 11 and Aluminum constituting 12 and zinc constituting metal particles 13 react to form alloy layers 16 (16a, 16b) at joints J1, J2.

  The contact portions C1 and C2 between the metal particles 13 and the aluminum members 11 and 12 are melted at about 381 ° C. by the eutectic reaction between zinc and aluminum without increasing the temperature to the melting point of zinc or aluminum.

  In the second pressing and heating step, the resin 14 of the bonding material 15 is further softened, and the metal particles 13 and the aluminum members 11 and 12 are brought into contact at the contact portions C1 and C2 between the metal particles 13 and the aluminum members 11 and 12, respectively. 12 is melted, the distance between the first aluminum member 11 and the second aluminum member 12 is reduced, and the bonding material 15 is further reduced in thickness accordingly, and the resin 14 constituting the bonding material 15 is reduced. To flow. Due to this flow, the resin 14 enters the fine irregularities on the surfaces of the aluminum members 11 and 12.

  After the second pressing and heating step described above is completed, the first and second aluminum members 11 and 12 are cooled to room temperature while maintaining the pressing state by the pressing jigs 21 and 22 provided with heating means. Thereafter, by releasing the pressed state, the joined body 10 in which the first and second aluminum members 11 and 12 are joined is obtained.

In the joined body 10 in which the first aluminum member 11 and the second aluminum member 12 are joined as described above, the alloy layers 16 (16a, 16b) are formed at the joints J1, J2, and the first And the 2nd aluminum members 11 and 12 and metal particle 13 are joined firmly.
Further, since the metal particles 13 are dispersed in the resin 14 and the joint portions J1 and J2 in which the alloy layers 16 (16a, 16b) are formed exist in the resin 14, the metal particles 13 and the alloy layers 16 (16a, 16b) are present. 16b) is not exposed to the atmosphere and is not oxidized.
Further, the resin 14 softened by heating penetrates into the fine irregularities on the surfaces of the aluminum members 11 and 12, whereby an anchor effect is exhibited and the bonding strength between the resin 14 and the aluminum members 11 and 12 is improved.

  Moreover, in this embodiment, since the thermal decomposition start temperature is as high as about 600 degreeC and is excellent in heat resistance, and the thermoplastic polyimide which does not contain an organic solvent is used as resin 14, it heats by the above-mentioned press heating process. Even in such a case, since there is no generation of decomposition gas or generation of vapor due to evaporation of the organic solvent, it is possible to prevent the occurrence of defects such as voids at the joint.

  Therefore, according to the above-described joining method, the first aluminum member 11 and the second aluminum member 12 can be reliably joined electrically and mechanically, and the joining state does not deteriorate over time. It becomes possible to obtain a body.

In addition, although this embodiment demonstrated the case where a press heating process was divided and performed to a 1st and 2nd press heating process, press heating is implemented in a series of processes under a suitable temperature profile. It is also possible to configure as described above.
In this embodiment, heating is started after an appropriate pressing state is set, but pressurization start and heating start may be performed simultaneously.

[Embodiment 2]
FIGS. 3A to 3C are views showing a method for joining aluminum members according to another embodiment (Embodiment 2).
The aluminum member joining method according to the second embodiment includes, as a joining material, a resin sheet 14a obtained by molding a resin into a sheet shape, and a plurality of metal particles 13 positioned on the upper surface (one main surface) of the resin sheet 14a. This is different from the first embodiment in which a sheet-like bonding material 15 in which metal particles 13 are dispersed in advance in the resin 14 is used as the bonding material 15a.

In the second embodiment, first, as shown in FIG. 3A, a resin sheet 14 a is disposed on the second aluminum member 12.
Next, the plurality of metal particles 13 are positioned (supplied) on the upper surface (one main surface) of the resin sheet 14a.
However, before the resin sheet 14a is disposed on the second aluminum member 12, the metal particles 13 are supplied onto the resin sheet 14a, and the bonding material 15a provided with the metal particles 13 on the upper surface of the resin sheet 14a is provided. It is also possible to form the bonding material 15a so as to be positioned on the second aluminum member 12 as shown in FIG.
The metal particles 13 may be positioned on the lower surface side or the upper and lower surfaces side of the resin sheet 14a.

  Next, as shown in FIG. 3B, after the first aluminum member 11 is positioned on the second aluminum member 12 via the bonding material 15a, the first aluminum member 11 and the second aluminum member 11 The metal particles 13 are embedded in the resin sheet 14a by heating and applying pressure so that one of the aluminum members 12 is pressed toward the other to soften the resin sheet 14a. Then, by further pressing and heating, as shown in FIG. 3B, the resin sheet 14a is deformed and the aluminum members 11 and 12 and the metal particles 13 are brought into contact with each other (first pressing and heating step).

  Then, after performing the 2nd press heating process in the same procedure as the case of above-mentioned Embodiment 1, it cools and cancels a press state (Drawing 3 (c)).

  Also by the method of the second embodiment, as in the case of the first embodiment, the first aluminum member 11 and the second aluminum member 12 can be securely and electrically joined. A joined body in which the joined state does not deteriorate with time can be obtained.

[Evaluation of joined body of aluminum members]
Next, in order to confirm the effect of the present invention, an aluminum member bonded body manufactured by the method of the above embodiment and an aluminum member bonded body manufactured by a method different from those of the first and second embodiments are prepared. The bonding strength and connection resistance (electrical resistance) of each were investigated.

The following three types of samples were prepared as evaluation samples (joined bodies).
(1) Sample 1
The joined body produced by the method of Embodiment 2 above.
(2) Sample 2 (comparative example)
A joined body in which the first aluminum member and the second aluminum member are joined only with resin.
(3) Sample 3 (comparative example)
A joined body in which a first aluminum member and a second aluminum member are joined only by a plurality of metal particles.

Samples 1 to 3 were produced using the materials and setting conditions shown below.
(A) First aluminum member: A1070
(B) Second aluminum member: A1070
(C) Resin: Thermoplastic polyimide (d) Metal particles: Zinc particles having a particle diameter of about 20 μm The volume ratio of the metal particles to the resin in sample 1 is 1: 1.
The number of metal particles in sample 3 is about the same as that in sample 1 (e) Area of joint: 9 mm ²
(F) Bonding material thickness: about 20 μm

(Measurement and evaluation of bonding strength)
The bonding strength was determined by measuring the force when the first and second aluminum members were each gripped and pulled in the shearing direction (direction perpendicular to the direction pressed during bonding) to break the bonded portion. . The pulling speed was 50 mm / min.

  As a result, the bonding strength of the sample 2 which is the comparative example was 38.8 N, and the bonding strength of the sample 3 which was also the comparative example was 16.8 N, while the bonding strength of the sample 1 according to the example of the present invention was 44.N. A joint strength of 6N was obtained.

(Measurement and evaluation of connection resistance)
The connection resistance was measured by a four-terminal method by applying a measurement probe to each of the first and second aluminum members.

  As a result, the connection resistance of the sample 3 as a comparative example was 3.1Ω, and the connection resistance of the sample 1 according to the example of the present invention was 3.4Ω, and an equivalent low resistance value was obtained. In addition, since the sample 2 was joined only by the resin having insulating properties, the connection resistance was not measured.

  From the above results, it was confirmed that according to the bonding method of the present invention, a bonded body of aluminum member having high bonding strength and low connection resistance can be obtained.

  In Embodiment 1 described above, the first aluminum member and the second aluminum member are made to conduct through one metal particle positioned therebetween, but through two or more metal particles. It can also be configured to conduct. Specifically, for example, there may be a case where two metal particles are connected to each other and a part of each of the two metal particles is joined to the first aluminum member and the second aluminum member. .

  In the present invention, an alloy layer of aluminum and zinc is formed at the joint between the aluminum member and the metal particles, but it is also possible to adopt a configuration in which the alloy is present throughout the metal particles.

  Also, in the present invention, the joining surface of the aluminum member is subjected to a roughening process, and the joining strength is further improved by an anchor effect due to the resin intruding into the fine irregularities on the surface of the aluminum member. Can also be

  The present invention is not limited to the above embodiment in other points, and various applications and modifications can be made within the scope of the present invention.

DESCRIPTION OF SYMBOLS 10 Aluminum member joined body 11 1st aluminum member 12 2nd aluminum member 13 Metal particle 14 Resin 14a Resin sheet 15, 15a Joining material 16 (16a, 16b) Alloy layer 21, 22 Press jig provided with heating means C1, C2 contact part J1, J2 joint part

Claims (6)

The first aluminum member and the second aluminum member, the main component of which are aluminum, are bonded together via a bonding material containing a plurality of metal particles whose main component is zinc and a resin, and the metal particles A joined body of aluminum members electrically connected via,
An joined body of aluminum members, wherein an alloy layer containing zinc and aluminum is formed at least at a joint portion between the first and second aluminum members and the metal particles.   The joined body of aluminum members according to claim 1, wherein the resin is a thermoplastic resin.   The joined body of aluminum members according to claim 2, wherein the thermoplastic resin is a polyimide resin. A method of joining a first aluminum member and a second aluminum member, the main component of which is aluminum,
In a state where a bonding material including a plurality of metal particles mainly composed of zinc and a thermoplastic resin is positioned between the first aluminum member and the second aluminum member, the first aluminum member And a step of heating to a temperature at which at least a part of the metal particles melts while the thermoplastic resin softens while applying pressure so that one of the second aluminum members is pressed toward the other. Then, while joining the 1st aluminum member and the 2nd aluminum member with the thermoplastic resin, zinc and aluminum are made into the contact part of the 1st and 2nd aluminum members, and the metal particles. An alloy layer containing the first and second aluminum members and the metal particles are joined to form an alloy layer. A method for joining ruminium members.   The method for joining aluminum members according to claim 4, wherein the thermoplastic resin is a polyimide resin. The bonding material is a bonding material comprising a resin sheet obtained by molding the thermoplastic resin into a sheet shape, and a plurality of the metal particles positioned on at least one of the front and back main surfaces of the resin sheet,
While applying pressure so that one of the first aluminum member and the second aluminum member is pressed toward the other, the resin softens and reaches a temperature at which at least a part of the metal particles melts. Through the heating step, the metal particles are embedded in the resin sheet, and zinc and aluminum are put into contact portions between the first and second aluminum members and the metal particles embedded in the thermoplastic resin. 6. The method for joining aluminum members according to claim 4, wherein an alloy layer is formed.

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