JP6213666B2 - Adhesive separation method of adherend - Google Patents

Description

The present invention is adhered to the first adherend and the second adherend is relates to adhesive separating how the separation to the adherend.

  Conventionally, "screwing" has been widely used as a method of mechanically fixing a certain adherend to another adherend.

  However, the screw may be loosened in an environment in which vibration is applied to the screwed portion, such as a railway vehicle, an automobile, or various production facilities.

  Therefore, as a countermeasure against screw loosening, for example, a method in which an anaerobic adhesive disclosed in Patent Document 1 is applied to a screwed portion and bonded is used.

Special table 2011-502199 gazette

  However, the method of applying the anaerobic adhesive to the screwed portion has a problem that it takes a long time (for example, about 12 hours at room temperature) from application of the anaerobic adhesive to curing. Moreover, since the basic component of an anaerobic adhesive is resin, there exists a problem that heat resistance is low.

  Moreover, when removing a screw | thread after anaerobic adhesive hardens | cures, it is necessary to remove a screw | thread, heating, for example to predetermined temperature (for example, 200 degree | times) or more.

An object of the present invention is to provide an adherend capable of easily bonding a first adherend and a second adherend and easily separating the first adherend and the second adherend having a high heat-resistant adhesive structure. and to provide a bonding separation how.

  The adherend separation method according to the present invention includes a first heating step, a second heating step, and a separation step.

  In the first heating step, a metal composite material including a first metal and a second metal is used. A 1st heating process heats the metal composite material provided between the 1st to-be-adhered body and the 2nd to-be-adhered body more than the melting temperature of the 1st metal, and is formed by melting and solidification of the 1st metal. The first adherend and the second adherend are bonded via the first metal member containing the second metal in the first metal phase.

  In the second heating step, the first metal member that bonds the first adherend and the second adherend is reheated at a temperature equal to or higher than the melting temperature of the first metal.

  In the separation step, the first adherend is formed using an intermetallic compound member composed of an intermetallic compound formed by a reaction between the first metal and the second metal constituting the first metal member by reheating. The second adherend is separated.

  When the metal composite material is heated in the first heating step, the first metal is melted. When the heating is completed, the first metal is solidified by, for example, natural cooling to form a first metal phase. As a result, a first metal member including the second metal in the first metal phase is generated. Then, the first adherend and the second adherend are bonded by the first metal member.

  Here, the time required for the first metal member to be generated after the metal composite material is heated is short because the first metal only melts and solidifies. Therefore, this adhesion separation method can easily bond the first adherend and the second adherend. The first metal member has higher heat resistance than the resin.

  Next, when the first metal member is reheated in the second heating step, the first metal and the second metal constituting the first metal member react to generate an intermetallic compound. As a result, an intermetallic compound member composed of an intermetallic compound is generated. That is, the first metal member changes to an intermetallic compound member.

  This intermetallic compound member is a member in which the porosity of the intermetallic compound member is higher than the porosity of the first metal member, or a member that is more brittle than the first metal member.

  Therefore, in the separation step, the first adherend and the second adherend can be easily separated using the intermetallic compound member as a separation portion.

  Therefore, according to the adhesion separating method of the adherend of the present invention, the first adherend and the second adherend can be easily bonded to each other and have a high heat-resistant adhesion structure. The kimono can be easily separated.

  In the adherend separation method of the adherend according to the present invention, the porosity of the intermetallic compound member is preferably higher than the porosity of the first metal member.

  In the adherend separation method according to the present invention, the metal composite material is preferably a metal paste containing a first metal and a second metal.

Further, in the adherend separation method according to the present invention, the first metal is a pure metal made of Sn or an alloy containing Sn as a main component,
The second metal is preferably an alloy containing CuNi or CuMn as a main component.

  In this configuration, an intermetallic compound containing at least two selected from the group consisting of Sn, Cu and Ni or at least 2 selected from the group consisting of Sn, Cu and Mn by the reaction of the first metal and the second metal. A seed-containing intermetallic compound is produced. An intermetallic compound is produced | generated at the temperature within the range of 200-300 degreeC, for example. The intermetallic compound has a melting point of 300 ° C. or higher.

  Further, the adherend separation method of the adherend of the present invention may be an embodiment in which the first adherend is a bolt having a threaded portion and the second adherend is a fixing member having a threaded portion. . In this case, the adherend separation method of the adherend of the present invention has the following two methods including an installation step and a fitting step.

  In the first method, in the installation step, a metal composite material is provided on the screw portion of the bolt or the screw portion of the fixing member, and in the fitting step, the bolt is fitted on the screw portion of the fixing member after the installation step. Match.

  Even in this method, the bolt and the fixing member that are the first adherend and the second adherend can be easily bonded, and the bolt and the fixing member having a high heat-resistant bonding structure can be easily separated.

  Next, in the second method, in the fitting process, the bolt is fitted into the screw portion of the fixing member, and in the installation step, the metal composite is placed on the gap between the fitted bolt and the screw portion of the fixing member. Provide material. Then, the first heating step heats the metal composite material, melts the first metal, and solidifies between the bolt and the threaded portion of the fixing member, and the second metal is formed in the first metal phase formed. The bolt and the screw portion of the fixing member are bonded via the first metal member including the first metal member.

  Even in this method, the bolt and the fixing member that are the first adherend and the second adherend can be easily bonded, and the bolt and the fixing member having a high heat-resistant bonding structure can be easily separated.

According to the adhesive separation how adherends of the invention, the first adherend and the second adherend can be easily adhered, first adherend having a bonding structure of a high heat resistance and a second adherend The body can be easily separated.

It is a flowchart which shows the adhesion separation method of the adhesive body which concerns on 1st Embodiment of this invention. It is sectional drawing which shows typically the adhesion separation process of the volt | bolt shown in FIG. It is an expanded sectional view which shows typically the adhesion part shown in FIG. It is sectional drawing which shows typically the adhesion separation process of the volt | bolt shown in FIG. It is an expanded sectional view which shows typically the adhesion part shown in FIG. It is sectional drawing which shows typically the adhesion separation process of the volt | bolt shown in FIG. It is an expanded sectional view which shows typically the adhesion part shown in FIG. It is the figure which compared the adhesive strength of the volt | bolt and nut which were adhere | attached with the metal paste shown in FIG. 2, and the adhesive strength of the volt | bolt and nut which were adhere | attached with the solder paste. FIG. 9A is an enlarged cross-sectional view showing a bonded portion of a bolt and a nut bonded with the metal paste shown in FIG. 2 after the heating step. FIG. 9B is an enlarged cross-sectional view showing a bonded portion of the bolt and nut bonded with the metal paste shown in FIG. 2 after the reheating step. FIG. 10A is an enlarged cross-sectional view showing a bonded portion of a bolt and a nut bonded with a solder paste after the heating step. FIG. 10B is an enlarged cross-sectional view showing a bonded portion of a bolt and a nut bonded with a solder paste after the reheating process. It is a flowchart which shows the adhesion separation method of the adhesive body which concerns on 2nd Embodiment of this invention. It is sectional drawing which shows typically the adhesion separation process of the volt | bolt shown in FIG. It is sectional drawing which shows typically the adhesion separation process of the volt | bolt shown in FIG. It is sectional drawing which shows typically the adhesion separation process of the volt | bolt shown in FIG. It is sectional drawing which shows typically the adhesion separation process of the volt | bolt shown in FIG.

  Hereinafter, several specific examples will be given with reference to the drawings to show a plurality of modes for carrying out the present invention. In each figure, the same reference numerals are assigned to the same portions. Each embodiment is an exemplification, and needless to say, partial replacement or combination of configurations shown in different embodiments is possible.

<< First Embodiment of the Invention >>
The method for bonding and separating bolts according to the first embodiment of the present invention will be described below.

  FIG. 1 is a flowchart showing a method for bonding and separating bolts according to a first embodiment of the present invention. FIG. 2 is a cross-sectional view schematically showing the bolt adhesive separation step shown in FIG. FIG. 3 is an enlarged cross-sectional view schematically showing the bonded portion shown in FIG. FIG. 4 is a cross-sectional view schematically showing the bonding and separating process of the bolt shown in FIG. FIG. 5 is an enlarged cross-sectional view schematically showing the bonded portion shown in FIG. FIG. 6 is a cross-sectional view schematically showing the bonding and separating process of the bolt shown in FIG. FIG. 7 is an enlarged cross-sectional view schematically showing the bonded portion shown in FIG.

  First, a bolt 50 having a screw part 51 and a nut 60 having a screw part 61 are prepared. In the present embodiment, the bolt 50 and the nut 60 are M8 hexagon bolts and nuts. The material of the bolt 50 and the nut 60 is brass.

  The bolt 50 corresponds to the “first adherend” of the present invention. The nut 60 corresponds to a “second adherend” or a “fixing member” of the present invention.

  Next, as shown in FIG. 2, the metal paste 10 is applied to the threaded portion 51 of the bolt 50 (FIG. 1: S1). Thereby, the metal paste 10 is provided on the screw portion 51 of the bolt 50. In the present embodiment, the applied metal paste 10 has a thickness of about 0.2 mm.

  Here, the metal paste 10 is a metal composite material including the first metal powder 11 and the second metal powder 21, as shown in FIG.

  The metal paste 10 becomes the 1st metal member 20 (refer FIG. 5) which contains the granular 2nd metal 21 in the 1st metal phase 12 formed by the melting of the 1st metal powder 11 by 1st heat processing. . The first metal and the second metal of the first metal phase 12 constituting the first metal member 20 are reheated (second heat treatment), that is, by applying a further amount of heat to the first metal member 20. It becomes the intermetallic compound member 30 (refer FIG. 7) comprised with the metal 21 and the intermetallic compound produced | generated by reacting by reheating.

  The porosity of the intermetallic compound member 30 is higher than the porosity of the first metal member 20 as shown in FIGS. The porosity of the intermetallic compound member 30 is, for example, 10-60 vol%, and the porosity of the first metal member 20 is, for example, 0-20 vol%.

  In the present embodiment, the material of the first metal 11 is a pure metal powder made of Sn, and the material of the second metal 21 is an alloy powder containing CuNi as a main component. The first metal 11 is a granular material having an average particle diameter of 5 μm. The second metal 21 is a granular material having an average particle size of 15 μm. The compounding ratio (weight ratio) of the first metal 11 and the second metal 21 is in the range of 40:60 to 90:10.

  The metal paste 10 is a paste formed by mixing the first metal 11, the second metal 21, rosin, an activator (adipic acid), and an organic solvent (diethylene glycol monohexyl ether). In the metal paste 10, the first metal 11 is 63.7 parts by weight, the second metal 21 is 27.3 parts by weight, the rosin is 2.5 parts by weight, the activator is 1.5 parts by weight, and the organic solvent is 5.0 parts by weight. Parts by weight.

  Here, the rosin, the activator, and the organic solvent are essential components for constituting the paste of the metal paste 10.

  The rosin is a rosin derivative such as natural rosin, hydrogenated rosin, disproportionated rosin, polymerized rosin, unsaturated dibasic acid-modified rosin and acrylic acid-modified rosin.

  Examples of the activator include monocarboxylic acids (eg, formic acid, acetic acid, lauric acid, palmitic acid, stearic acid, benzoic acid, etc.), dicarboxylic acids (eg, oxalic acid, malonic acid, succinic acid, glutaric acid, adipic acid, suberin) Acid, azelaic acid, sebacic acid, phthalic acid, etc.), bromoalcohols (eg, 1-bromo-2-butanol, etc.), organic amine hydrohalides, bromoalkanes, bromoalkenes, benzylbromides, polyamines And chlorinated activators.

  Examples of the organic solvent include ether alcohols (for example, diethylene glycol monohexyl ether, diethylene glycol monobutyl ether), non-ether alcohols (for example, terpineol, benzyl alcohol), esters (for example, butyl benzoate, diethyl adipate) Etc.), hydrocarbons (for example, tetradecane, n-hexane and the like), pyrrolidones (for example, N-methyl-2-pyrrolidone and the like) and the like.

  Next, the bolt 50 is fitted into the threaded portion 61 of the nut 60 (FIG. 1: S2).

  Next, the bolt 50 and the threaded portion 61 of the nut 60 are heated above the melting temperature of the first metal 11 (FIG. 1: S3). Here, the melting temperature of Sn constituting the first metal 11 is 231.93 ° C.

  Thereby, when the metal paste 10 provided between the bolt 50 and the screw portion 61 of the nut 60 is heated, the powdered first metal 11 is melted. When the heating is finished, the first metal naturally cools and solidifies to form the first metal phase 12. That is, the metal paste after the first heat treatment has a relatively dense structure in which the second metal particles are dispersed in a metal body containing the first metal as a main component at room temperature.

  As a result, as shown in FIGS. 4 and 5, the first metal member 20 including the second metal particles 21 in the first metal phase 12 is generated. Then, the bolt 50 and the nut 60 are firmly joined via the first metal member 20.

  Here, the time required for the first metal member 20 to be generated after the metal paste 10 is heated is short because the first metal 11 only melts and solidifies. Therefore, the two adherends can be easily and firmly joined (slack prevention). Moreover, the 1st metal member 20 has high heat resistance compared with resin.

  In the heating process of S3, when the heating temperature is less than 240 ° C., the first metal 11 (pure metal made of Sn) is not sufficiently melted, and the bolt 50 and the nut 60 cannot be sufficiently bonded. Further, even when the first metal 11 is melted, if the amount of heat (heating temperature × heating time) is insufficient, the solvent remains between the bolt 50 and the nut 60, and the bolt 50 and the nut 60 are sufficiently connected. Can not be bonded.

  On the other hand, in the heating step of S3, when the heating temperature exceeds 350 ° C. or the amount of heat (heating temperature × heating time) is excessive, from the metal paste 10 simultaneously with the transformation from the metal paste 10 to the first metal member 20 The transformation to the intermetallic compound member 30 via the first metal member 20 also proceeds, and a sufficient adhesive strength of a predetermined value or more cannot be obtained.

  Therefore, in the heating step, the heating temperature is preferably 240 to 350 ° C. and the heating time is preferably about 20 to 120 seconds, and the heating temperature is preferably 250 to 300 ° C. and the heating time is about 60 to 100 seconds. .

  In the present embodiment, the bolt 50 and the nut 60 are heated by a hot air gun so that the heating temperature is about 350 ° C. and the heating time is 60 seconds. The heating temperature is not the set temperature of the hot air gun, but the temperature measured at the joint between the bolt 50 and the nut 60.

  Next, the bolt 50 and the nut 60 bonded through the first metal member 20 are reheated at a temperature equal to or higher than the melting temperature of the first metal 11 (FIG. 1: S4).

Thereby, when the 1st metal member 20 is reheated, the 1st metal phase 12 which comprises the 1st metal member 20 will fuse | melt, the 1st metal 11 and the 2nd metal particle 21 which fuse | melted will react, An intermetallic compound of the first metal and the second metal is generated. This reaction is, for example, a reaction associated with liquid phase diffusion bonding (“TLP bonding: Transient Liquid Phase Diffusion Bonding”). The produced intermetallic compound is an alloy containing at least two selected from the group consisting of Cu, Ni and Sn. Specifically, intermetallic compounds are, for example, _{Cu 6 Sn 5, Ni 3 Sn} 4, Cu 2 NiSn like. The melting point of the intermetallic compound is 300 ° C. or higher, and further 400 ° C. or higher.

  As a result, as shown in FIGS. 6 and 7, an intermetallic compound member 30 composed of an intermetallic compound is generated. That is, the relatively dense first metal member 20 changes to an intermetallic compound member (second metal body) 30 having a relatively large number of holes.

  In addition, in the reheating process of S4, when the heating temperature is less than 300 ° C. or the amount of heat (heating temperature × heating time) is too small, the transformation from the first metal member 20 to the intermetallic compound member 30 becomes insufficient, In some cases, it is not possible to obtain an adhesive strength of a certain value or less that is easy to separate.

  On the other hand, in the reheating step of S4, even when the heating temperature is 300 to 500 ° C., if the heating time is too long, that is, the amount of heat applied to the second metal member (heating temperature × heating time) is excessive. In addition, the work efficiency may be lowered, and the properties of the adherend (bolts, nuts, and further members stopped by this) may be deteriorated. In particular, when the heating temperature exceeds 500 ° C., some intermetallic compounds melt and flow out, and the adherends (bolts and nuts) may undesirably come off.

  Therefore, in the reheating step, the heating temperature is preferably 300 to 500 ° C., the heating time is preferably about 120 to 1200 seconds, the heating temperature is 350 to 400 ° C., and the heating time is about 180 to 360 seconds. Is more preferable.

  In this embodiment, the bolt 50 and the nut 60 are reheated with a hot air gun so that the heating temperature is about 350 ° C. and the heating time is 180 seconds. The heating temperature is not the set temperature of the hot air gun, but the temperature measured at the joint between the bolt 50 and the nut 60.

  Next, the bolt 50 and the nut 60 are separated using the intermetallic compound member 30 as a separation part (FIG. 1: S5). As a result, the bolt 50 rotates counterclockwise with respect to the nut 60 and is removed from the nut 60.

  Here, as described above, the intermetallic compound member 30 is a member in which the porosity of the intermetallic compound member 30 is higher than the porosity of the first metal member 20. Therefore, in the separation step, the bolt 50 and the nut 60 can be easily separated using the intermetallic compound member 30 as a separation portion.

  Therefore, according to the adherend separation method of the adherend according to the present embodiment, the bolt 50 and the nut 60 can be easily and firmly joined, that is, the loosening can be prevented. By changing the metal body to an easily dismantleable metal, the bolt 50 and the nut 60 can be easily separated and disassembled.

  Next, the bonding strength of the bolt 50 and the nut 60 bonded with the metal paste 10 shown in FIG. 2 is compared with the bonding strength of the bolt 50 and the nut 60 bonded with the solder paste.

  FIG. 8 is a diagram comparing the adhesive strength of the bolt 50 and the nut 60 bonded with the metal paste 10 shown in FIG. 2 with the adhesive strength of the bolt 50 and the nut 60 bonded with the solder paste.

  8 shows that the bolt 50 and the nut 60 are naturally cooled after being heated at 350 ° C. for a predetermined heating time, and the bolt 50 is fixed and the nut 60 is turned with a wrench so that the bolt 50 and the nut 60 are separated. The experimental result which measured the maximum torque when it destroys without breaking, or when the volt | bolt 50 and the nut 60 isolate | separated is shown.

  8 shows a graph of the bolt 50 and the nut 60 bonded with the metal paste 10, and a solid line of FIG. 8 shows a graph of the bolt 50 and the nut 60 bonded with the solder paste. In addition, the solder paste used in this experiment is a Sn—Ag—Cu-based paste (manufactured by Senju Metal Industry Co., Ltd., trade name: M705).

  From the experiment, it is clear that the bolt 50 and the nut 60 bonded with the solder paste and the bolt 50 and the nut 60 bonded with the metal paste 10 are broken without being separated after being heated for 90 seconds. It became. That is, it became clear that the adhesive strength of the bolt 50 and the nut 60 bonded with the solder paste and the adhesive strength of the bolt 50 and the nut 60 bonded with the metal paste 10 are extremely high, and the bolt 50 and the nut 60 cannot be separated. .

  However, with the bolt 50 and the nut 60 bonded with the solder paste, the bolt 50 and the nut 60 were broken without being separated even after heating for 250 seconds or more, whereas the bolt 50 bonded with the metal paste 10 was destroyed. It was revealed that the bolt 50 and the nut 60 were separated with a weak torque after heating for 250 seconds or more.

  That is, the bonding strength of the bolt 50 and the nut 60 bonded with the solder paste is always high regardless of the heating time, whereas the bonding strength of the bolt 50 and the nut 60 bonded with the metal paste 10 is the heating time for a certain time. It has been clarified that when the value exceeds the value, it is extremely lowered.

  The reason for the above results is that the porosity of the intermetallic compound member 30 generated after heating for 250 seconds or more is higher than the porosity of the first metal member 20 generated after heating for 90 seconds. It is thought that.

  From the above, it is clear that the bonding strength of the bolt 50 and the nut 60 bonded with the metal paste 10 is high after the heating process in which the heating time is less than a certain time and decreases after the reheating process in which the heating time exceeds the certain time. became.

  Next, FIG. 9A is an enlarged cross-sectional view showing a bonded portion of the bolt 50 and the nut 60 bonded with the metal paste 10 shown in FIG. 2 after being naturally cooled by heating for 90 seconds. FIG. 9B is an enlarged cross-sectional view showing a bonded portion of the bolt 50 and the nut 60 bonded with the metal paste 10 illustrated in FIG. 2 after being naturally cooled by heating for 480 seconds.

  FIG. 10A is an enlarged cross-sectional view showing a bonded portion of the bolt 50 and the nut 60 bonded with the solder paste 90 after being naturally cooled by heating for 90 seconds. FIG. 10B is an enlarged cross-sectional view showing a bonded portion of the bolt 50 and the nut 60 bonded with the solder paste 90 after being naturally cooled by heating for 480 seconds.

  In FIG. 9A, the white portion between the bolt 50 and the nut 60 indicates the first metal member 20, and the black portion between the bolt 50 and the nut 60 indicates a hole. Yes. In FIG. 9B, the white portion between the bolt 50 and the nut 60 indicates the intermetallic compound member 30, and the black portion between the bolt 50 and the nut 60 indicates a hole. Yes.

  10A and 10B, the white portion between the bolt 50 and the nut 60 indicates the solder paste 90, and the black portion between the bolt 50 and the nut 60 indicates a hole. ing. Here, the solder paste 90 used in this experiment is a Sn—Ag—Cu based paste (manufactured by Senju Metal Industry Co., Ltd., trade name: M705).

  From experiments, the porosity of the solder paste 90 is substantially the same after 90 seconds of heating and after 480 seconds of heating, as shown in FIGS. 10 (A) and 10 (B). It became clear that the porosity of the compound member 30 is higher than the porosity of the first metal member 20 after heating for 90 seconds, as shown in FIGS.

  That is, the bonding strength of the bolt 50 and the nut 60 bonded with the solder paste 90 is always high regardless of the heating time, whereas the bonding strength of the bolt 50 and the nut 60 bonded with the metal paste 10 is constant for the heating time. It became clear that after the reheating process exceeding time, it fell extremely.

  From the above, according to the adherend separation method of the adherend according to the present embodiment, the bolt 50 and the nut 60 can be easily adhered (loosening prevention), and the bolt 50 and the nut 60 having a high heat-resistant adhesion structure can be easily separated. it can.

<< Second Embodiment >>
A method for bonding and separating bolts according to the second embodiment of the present invention will be described below.

  FIG. 11 is a flowchart showing a method of bonding and separating bolts according to the second embodiment of the present invention. 12-15 is sectional drawing which shows typically the adhesion separation process of the volt | bolt shown in FIG.

  The difference between the adhesion separation method of the second embodiment and the adhesion separation method of the first embodiment shown in FIG. 1 is that the metal paste 10 is applied after fitting the bolts 50 to the nuts 60 at S11 and S12. is there. Since the other steps are the same, description thereof is omitted.

  First, as shown in FIG. 12, the bolt 50 is fitted into the threaded portion 61 of the nut 60 (FIG. 11: S11).

  Next, as shown in FIG. 13, the metal paste 10 is applied on the gap between the screw portion 51 of the bolt 50 and the screw portion 61 of the nut 60 (FIG. 11: S12). Thereby, the metal paste 10 is provided on the gap between the screw part 51 of the bolt 50 and the screw part 61 of the nut 60.

  Next, the bolt 50 and the nut 60 are heated above the melting temperature of the first metal particles 11 (FIG. 11: S3).

  Thus, when the metal paste 10 provided on the gap between the screw portion 51 of the bolt 50 and the screw portion 61 of the nut 60 is heated, the first metal particles 11 are melted and the screw of the bolt 50 and the nut 60 is heated. It flows between the part 61. When the heating is finished, the first metal naturally cools and solidifies to form the first metal phase 12.

  As a result, as shown in FIGS. 14 and 5, the first metal member 20 including the second metal grains 21 in the first metal phase 12 is generated. The bolt 50 and the threaded portion 61 of the nut 60 are bonded via the first metal member 20.

  Next, when the 1st metal member 20 is reheated by the reheating process (FIG. 11: S4) similarly to 1st Embodiment, the 1st metal of the 1st metal phase 12 which comprises the 1st metal member 20 And the second metal particles 21 react by reheating to produce an intermetallic compound.

  As a result, as shown in FIGS. 15 and 7, an intermetallic compound member 30 composed of an intermetallic compound is generated.

  Then, the bolt 50 is removed from the nut 60 through the separation step (FIG. 11: S5) as in the first embodiment.

  As described above, also in this embodiment, the time required from when the metal paste 10 is heated until the first metal member 20 is generated is short because the first metal particles 11 are merely melted and solidified. Therefore, two adherends can be easily bonded. Moreover, the 1st metal member 20 has high heat resistance compared with resin.

  Also in this embodiment, the intermetallic compound member 30 is a member in which the porosity of the intermetallic compound member 30 is higher than the porosity of the first metal member 20.

  Therefore, in the separation step of S5, the bolt 50 and the nut 60 can be easily separated using the intermetallic compound member 30 as a separation portion.

  Therefore, according to the adherend separation method according to the present embodiment, the same effects as those of the adherend separation method according to the first embodiment can be obtained.

<< Other Embodiments >>
In the above-described embodiment, the metal paste 10 is used for the adhesion (loosening prevention) and separation of the bolt 50 and the nut 60, but the present invention is not limited to this. In implementation, for example, the metal paste 10 may be used for bonding (separation prevention) and separation of bolts and metal pipes.

  In the above-described embodiment, the surfaces of the bolt 50 and the nut 60 are preferably a Cu-based metal having a high adhesive force with the first metal member 20. However, the surface of SUS (stainless steel), rolled steel, carbon steel, or the like may be a metal other than a Cu-based metal.

  In the first embodiment described above, the metal paste 10 is provided on the threaded portion 51 of the bolt 50, and then the bolt 50 is fitted to the nut 60. However, the present invention is not limited to this. In implementation, the metal paste 10 may be provided on the screw portion 61 of the nut 60 and then the bolt 50 may be fitted to the nut 60.

  In the above-described embodiment, the metal paste 10 including the first metal particles 11 and the second metal particles 21 is used as the metal composite material. However, the present invention is not limited to this.

  In implementation, the metal composite material includes, for example, a first metal layer containing a first metal (typically a plating layer, a foil shape, etc.) and a second metal layer containing a second metal (typically It may be a laminate with a plating layer, a foil shape, etc., or may be a sheet or tape containing first metal particles and second metal particles.

  Here, when a sheet-like or tape-like metal composite material is used, the metal composite material may be PET (polyethylene terephthalate), PC (polycarbonate), PS (polystyrene), PI (polyimide), PE (polyethylene), PP ( It is preferable to use a carrier film such as polypropylene) containing the first metal particles and the second metal particles.

  Additives that may be used in paste-like or sheet-like metal composites include resins, thixotropic materials (thixotropic agents), thermosetting resins, antioxidants, flame retardants, dispersants, and metal additives. Products, leveling agents, antifoaming agents, matting agents, plasticizers and the like.

  The resin is, for example, an acrylic resin, a cellulose resin, a polyurethane resin, a polyester resin, an epoxy resin, or a silicon resin.

  Examples of thixotropic materials (thixotropic agents) include castor oil, hydrogenated castor oil, beeswax, carnauba wax, stearamide, 12-hydroxystearic acid ethylenebisamide, and fatty acid amide.

  Examples of the thermosetting resin include an epoxy resin, a phenol resin, an amino resin, a silicon resin, a polyurethane resin, and an unsaturated polyester resin.

  Antioxidants include, for example, phenolic antioxidants (for example, pentaerythrityl-tetrakis [3- (3,5-di-t-butyl-4-hydroxyphenyl) propionate], etc.), phosphorus antioxidants, sulfur-based antioxidants It is an antioxidant.

  Flame retardants are, for example, bromo compounds, phosphorus compounds, metal hydroxides (eg magnesium hydroxide, aluminum hydroxide), red phosphorus and their modifying organisms. The dispersant is, for example, a phosphate-based dispersant (for example, a phosphate ester-based dispersant) or an amine-based dispersant.

  Examples of the metal additive include Ag, Au, Al, Bi, C, Co, Cu, Fe, Ga, Ge, In, Mn, Mo, Ni, P, Pb, Pd, Pt, Si, Sb, and Zn. These addition forms are not limited to the impurities contained in the metal powder, but may be used as a metal complex, a metal compound, or the like as an additive.

  In the above-described embodiment, the metal paste 10 includes a resin material that softens and flows without disappearing (or decomposes) in the heating step of S3 and disappears (or decomposes) in the reheating step of S4. Also good.

  In this case, in the heating process of S <b> 3, the resin material oozes around the first metal member 20 to form a resin film, and the resin film functions as a protective film that covers the outer periphery of the first metal member 20. And since a resin film lose | disappears (or decomposes | disassembles) in the reheating process of S4, isolation | separation of a 1st to-be-adhered body and a 2nd to-be-adhered body is not prevented.

  In the embodiment described above, the material of the first metal particles 11 is a pure metal made of Sn, and the material of the second metal particles 21 is an alloy containing CuNi as a main component. However, the present invention is not limited to this. Absent. In implementation, for example, the first metal may be an alloy containing Sn as a main component, and the second metal may be an alloy containing CuMn as a main component.

  Moreover, in the above-mentioned embodiment, although a 1st metal is a granular material and a 2nd metal is a granular material, it does not restrict to this. In implementation, for example, the first metal may be a plating layer or a foil, the second metal may be a paste layer (thick film layer), the first metal may be a paste layer (thick film layer), and the second metal. May be a plating layer or a foil.

  Moreover, in implementation, for example, if the shape of the metal composite material is a paste or sheet, the first metal and the second metal are in the form of particles such as Sn particles and CuNi particles shown in FIG. If the shape of the metal composite material is a layer shape or a foil shape, a phase shape like the Sn phase shown in FIG. 5 is preferable.

  In implementation, for example, the first metal layer containing the first metal or the second metal layer containing the second metal is formed on the surface of the first adherend, and then the first metal layer or the first metal layer is formed. A metal paste formed by mixing the first metal particles and the second metal particles may be applied on the two metal layers. In this case, the first metal layer or the second metal layer and the metal paste constitute a metal composite material.

  When the metal composite material is in the form of a paste or sheet, the average particle size of the first metal particles is preferably about 1 to 50 μm, and the average particle size of the second metal particles is preferably about 1 to 50 μm. The blend ratio (weight ratio) of the first metal particles and the second metal particles is preferably 40:60 to 90:10.

  Here, when the blending ratio of the first metal particles is less than 40 wt%, the first metal component does not sufficiently flow between the first adherend and the second adherend during heating, and the first adherend after the heating step is not performed. There is a possibility that sufficient adhesive strength between the adherend and the second adherend cannot be obtained.

  On the other hand, when the blending ratio of the first metal particles exceeds 90 wt%, a large amount of unreacted first metal is present at the interface between the first adherend and the second adherend and the metal compound member even after the reheating step. There remains a possibility that the strong adhesion between the first adherend and the second adherend is maintained, and separation is impossible.

  In addition, when both the first metal particles and the second metal particles have an average particle diameter of less than 1 μm, the metal particles are likely to aggregate, and there is a possibility that problems such as metal particles settling during the production of the metal paste may occur.

  Or there exists a possibility that a composition may become locally nonuniform in a metal paste by aggregation of a metal particle. In this case, sufficient adhesion between the first adherend and the second adherend cannot be obtained after the heating step, or even after the reheating step, the first adherend and the second adherend and the metal. There is a possibility that a large amount of unreacted first metal remains at the interface with the compound member, and a strong adhesive force between the first adherend and the second adherend is maintained and cannot be removed.

  Furthermore, since the specific surface area of the second metal particles increases, the degree of oxidation on the surface of the second metal particles increases, and the formation of intermetallic compounds is suppressed due to the decrease in wettability of the surface of the second metal particles. There is a fear.

  On the other hand, if the average particle size of both the first metal particles and the second metal particles exceeds 50 μm, the particles may not enter the gap between the bolt 50 and the nut 60. More specifically, the nut 60 may not be tightened in the case of pre-coating as in the first embodiment described above. In the case of post-coating as in the above-described second embodiment, the bolt 50 and the nut 60 may not be tightened. There is a possibility that particles do not penetrate into the gap.

  Next, when the metal composite material is a laminate (plating laminate), the thickness of the first metal layer is preferably 1.0 to 70 μm, and the thickness of the second metal layer is preferably 0.1 to 30 μm. Further, the thickness ratio between the first metal layer and the second metal layer is preferably 50:50 to 90:10.

  When the thickness of the first metal layer is less than 1.0 μm, the sum of the thickness of the first metal layer and the thickness of the second metal layer is smaller than the gap between the bolt 50 and the nut 60, and the bolt 50 and the nut 60 are joined. May be insufficient.

  Therefore, when the second metal layer is thickened, the second metal layer becomes thicker than necessary with respect to the first metal layer, so that the reaction of the second metal layer to the intermetallic compound does not proceed sufficiently, and the bolt There is a possibility that adhesion to one of the adherends 50 and nut 60 is insufficient.

  On the other hand, if the thickness of the first metal layer exceeds 50 μm, the sum of the thickness of the first metal layer and the thickness of the second metal layer becomes larger than the gap between the bolt 50 and the nut 60, and the nut 60 may not be tightened. is there.

  Therefore, when the second metal layer is thinned, the second metal layer becomes thinner than necessary with respect to the first metal layer. Therefore, even after reheating, the interface between the bolt 50 and the nut 60 and the intermetallic compound member. In this case, a large amount of unreacted first metal remains, a strong adhesive force between the bolt 50 and the nut 60 is maintained, and the bolt 50 and the nut 60 may not be separated.

  When the ratio of the thickness of the first metal layer is less than 50%, the reaction of the second metal layer with the intermetallic compound does not proceed sufficiently, and the bonding of the bolt 50 and the nut 60 to one adherend is insufficient. There is a risk.

  On the other hand, if the blending ratio of the first metal particles exceeds 90%, a large amount of unreacted first metal remains at the interface between the bolt 50 and the nut 60 and the intermetallic compound member even after reheating. The strong adhesive force between the nut 50 and the nut 60 is maintained, and the bolt 50 and the nut 60 may not be separated.

  Next, when the metal composite material has a foil shape, the thickness of the first metal layer is preferably 10 to 50 μm, and the thickness of the second metal layer is preferably 10 to 30 μm. The ratio of the thickness of the first metal layer to the thickness of the second metal layer is preferably 50:50 to 82:18.

  When the thickness of the first metal layer and the thickness of the second metal layer are both less than 10 μm, it is difficult to produce a foil with the current technology. On the other hand, when both the thickness of the first metal layer and the thickness of the second metal layer are equal to or higher than the upper limit values (50 μm, 30 μm), the same problem as the above-described plated laminate may occur.

  The first metal member preferably has a different color from the metal composite material and the intermetallic compound member. That is, an appropriate amount of a dye, an organic pigment, or an inorganic pigment may be added as a paste colorant. As the colorant is selected, the user can easily know that the metal composite material has changed to the first metal member and that the first metal member has changed to the intermetallic compound member.

  In the above-described embodiment, the material of the second metal 21 is a CuNi alloy, but is not limited thereto. In implementation, for example, a CuMn alloy may be used instead of the CuNi alloy. In this case, in the second heating step (S4 in FIG. 1), the reaction between the molten Sn (first metal) and the CuMn alloy causes the inter-metal containing at least two selected from the group consisting of Cu, Mn and Sn. A compound is produced.

  Finally, the above description of the embodiments should be considered as illustrative in all points and not restrictive. The scope of the present invention is shown not by the above embodiments but by the claims. Furthermore, the scope of the present invention is intended to include all modifications within the meaning and scope equivalent to the scope of the claims.

DESCRIPTION OF SYMBOLS 10 ... Metal paste 11 ... 1st metal grain 12 ... 1st metal phase 20 ... 1st metal member 21 ... 2nd metal grain 30 ... Intermetallic compound member 50 ... Bolt 60 ... Nut 90 ... Solder paste

Claims (6)

A metal composite material including a first metal and a second metal provided between the first adherend and the second adherend is heated at a temperature equal to or higher than the melting temperature of the first metal, and the first metal is melted. And a first heating step for bonding the first adherend and the second adherend through a first metal member containing the second metal in a first metal phase formed by solidification;
A second heating step of reheating the first metal member for bonding the first adherend and the second adherend at a temperature equal to or higher than the melting temperature of the first metal;
With the first adherend as an isolation part, an intermetallic compound member composed of an intermetallic compound formed by reacting the first metal and the second metal constituting the first metal member by reheating is used. And a separation step of separating the second adherend from each other.   The adhesion separation method of the adherend according to claim 1, wherein a porosity of the intermetallic compound member is higher than a porosity of the first metal member.   The adhesion separation method of the adherend according to claim 1 or 2, wherein the metal composite material is a metal paste containing the first metal and the second metal. The first metal is a pure metal made of Sn or an alloy containing Sn as a main component,
The adhesion separation method of the adherend according to any one of claims 1 to 3, wherein the second metal is an alloy containing CuNi or CuMn as a main component. The first adherend is a bolt having a thread portion,
The second adherend is a fixing member having a threaded portion,
An installation step of providing the metal composite material on the screw portion of the bolt or the screw portion of the fixing member;
The adhesion separation method of the adherend according to any one of claims 1 to 4, further comprising a fitting step of fitting the bolt with the screw portion of the fixing member after the installation step. . The first adherend is a bolt having a thread portion,
The second adherend is a fixing member having a threaded portion,
A fitting step of fitting the bolt with the threaded portion of the fixing member;
An installation step of providing the metal composite material on a gap between the bolt and the threaded portion of the fixing member fitted together,
In the first heating phase, the metal composite material is heated, and the first metal is melted and solidified between the bolt and the screw portion of the fixing member. The adherend according to any one of claims 1 to 4, wherein the bolt and the screw portion of the fixing member are bonded to each other through the first metal member including the second metal. Adhesion separation method.