JP2011065930A - Connection structure, electric furnace, method of manufacturing connection structure and method of repairing electrode - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a connection structure improving conductivity between an electrode and a terminal. <P>SOLUTION: The connection structure 2 connects an electrode 12 attached to a structure to a connection conductive part 13 to be connected to a power supply. The electrode 12 is formed with a first contact surface 12a, and the connection conductive part 13 is formed with a second contact surface 13a facing the first contact surface 12a. The connection structure 2 includes: a filler 20 formed of a conductive plastic material filled between the first contact surface 12a and the second contact surface 13a; and fixing means 21-23 urging the first contact surface 12a and the second contact surface 13a in mutually approaching directions to fix the electrode 12 and the connection conductive part 13. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a connection structure, an electric furnace, a manufacturing method of the connection structure, and an electrode repair method.

  2. Description of the Related Art Conventionally, a technique has been used in which power is exchanged between a device and the outside by connecting electrodes of various devices that handle power and terminals that are externally connected to a power source or the like. Specific examples of various apparatuses include a power generation apparatus using a solar cell, a processing apparatus such as an electric furnace, a thermal spraying apparatus, and the like. The electric furnace has, for example, a structure in which a pair of electrodes is attached to a furnace body that accommodates an object to be processed. The electrode is connected to the terminal by being sandwiched between clamps including the terminal.

  In a device that handles a large current (for example, 10 A or more), when a large current flows through a connection structure between an electrode and a terminal, a conductor such as the connection structure, the electrode, or the terminal may generate heat and deteriorate. Deterioration of the conductor causes inconveniences such as deterioration of electrical characteristics, shortening of the device life and shortening of the maintenance cycle. From the viewpoint of avoiding these disadvantages, a technique for improving the conductivity of the connection structure in a device that handles a large current is expected.

  In recent years, the power generation capability of the power generation device and the processing capability of the processing device have been improved, and it is expected that the current flowing through the connection structure of various devices will increase. It is important to improve the conductivity of the connection structure from the viewpoint of adapting to the increase in capacity of various devices.

As a technique for improving the conductivity of the connection structure, techniques disclosed in Patent Documents 1 to 3 can be cited.
In Patent Document 1, a conductive film made of gold, platinum or the like is sandwiched between an electrode made of silicon carbide and a metal electrode (terminal) made of titanium or the like.
In Patent Document 2, an adhesive is applied on a contact surface between graphite electrodes to be connected with a powdery energization promoter, and the graphite electrodes are pressed against each other.
In Patent Document 3, an electrically conductive fixed lubricant, which is a mixture of graphite powder, starchy glue, and water, is applied to a threaded portion between a nipple and a socket, and the nipple and the socket are bonded.

JP 2008-117556 A Japanese Patent Laid-Open No. 60-228023 JP 59-104053 A

The techniques of Patent Documents 1 to 3 have the following problems.
In Patent Document 1, if the force with which the electrode or terminal sandwiches the conductive film is insufficient, the effect of increasing the contact area is reduced. If the conductive film is sandwiched with sufficient force so that the conductors are in close contact with each other, the surface of the relatively low-hardness conductor is damaged due to the difference in hardness between the conductors, and the contact area decreases as the damage progresses over time Resulting in.

  In Patent Documents 2 and 3, voids may be formed in the filler due to evaporation of the solvent or the like in the process in which the filler such as adhesive or lubricant is dried to become the filler. In addition, voids may be formed in the filler due to evaporation of the solvent remaining in the filler due to heat during use of the apparatus, and thermal decomposition of organic components contained in the filler. If such a gap exists at the interface between the filler and the conductor, the contact area between the filler and the conductor is reduced. If voids exist inside the filler, the filler itself becomes highly resistive.

  When the resistance between the electrode and the terminal partially becomes high due to a decrease in the contact area or the like, the current flowing through the connection structure is concentrated locally. As a result, the vicinity of the connection structure is heated so that it is red-hot, and the deterioration of the electrodes, terminals, and the like proceeds at an accelerated rate. As a result, it becomes difficult to extend the life of the apparatus and reduce the maintenance frequency.

  The present invention has been made in view of the above circumstances, and is a connection structure capable of improving the conductivity between an electrode and a terminal, an electric furnace using the connection structure, a method of manufacturing the connection structure, and An object is to provide an electrode repair method.

In the present invention, the following means are adopted in order to achieve the object.
The connection structure of the present invention is a connection structure for connecting an electrode attached to a structure to a connection conductive portion connected to a power source, wherein a first contact surface is formed on the electrode and the connection conductive portion is connected to the connection conductive portion. A second contact surface facing the first contact surface is formed, and a filler filled with a space between the first contact surface and the second contact surface and formed of a conductive plastic material; The first contact surface and the second contact surface are urged in a direction approaching each other, and fixing means for fixing the electrode and the connection conductive portion is included.

  In this case, since the filler is formed of a conductive plastic material, the filler is formed in close contact with the first contact surface and the second contact surface when the plastic material is deformed. The generation of a gap between the contact surface and the second contact surface is reduced. Since the fixing means urges the first contact surface and the second contact surface in a direction approaching each other, the filler is pressed against the first contact surface and the second contact surface, and the first contact surface and the second contact surface are pressed. The generation of voids between the contact surfaces is reduced. As described above, since the generation of voids in the filler is reduced, the reduction in the contact area between the electrode and the connection conductive portion is reduced. Therefore, power concentration due to a decrease in contact area is avoided, and deterioration of the connection structure, electrodes, and connection conductive portion due to power concentration is avoided.

The plastic material may contain conductive particles and an inorganic binder. In this case, the inorganic binder is preferably sodium silicate.
If the plastic material contains a binder, it becomes easy to adjust the viscosity of the plastic material. In addition, when an inorganic binder is employed as the binder, the inorganic binder is thermally stable as compared with the organic binder, so that the heat resistance of the filler is increased.

  Although sodium silicate itself is an insulator, by adopting a plastic material containing conductive particles and sodium silicate, a connection structure having excellent conductivity is obtained as will be described later in [Experimental Example]. Moreover, even if bubbles are mixed between the first contact surface and the second contact surface, the conductive particles are pressed by the urging force between the first contact surface and the second contact surface and enter the bubbles. Since the conductive particles are continuously distributed also in the bubble portion between the first contact surface and the second contact surface, conduction can be achieved even in the bubble portion, and high resistance due to the bubble is avoided.

It is good to include the resistance measuring device which measures the resistance value of the filler.
If it does in this way, connection reliability of a connection structure by a filler can be evaluated.

The electric furnace of the present invention is connected to a furnace body that accommodates an object to be processed, a first electrode and a second electrode that are attached to the furnace body, and a power source that supplies power to the first electrode. And a connection structure for connecting the first electrode and the connection conductive part, wherein the connection structure is the connection structure according to the present invention.
According to the connection structure according to the present invention, since the deterioration of the connection structure, the electrodes, and the connection conductive portion is avoided, the maintenance frequency can be reduced according to the electric furnace of the present invention.

  A method for manufacturing a connection structure according to the present invention is a method for manufacturing a connection structure for connecting an electrode attached to a structure and a connection conductive portion connected to a power source, wherein a first contact surface is formed on the electrode. And a second contact surface facing the first contact surface is formed on the connection conductive portion, and at least one of the first contact surface and the second contact surface has conductive plasticity. A step of providing a material, and a step of biasing the first contact surface and the second contact surface in a direction approaching each other to fix the electrode and the connection conductive portion after the step of providing the plastic material; A step of curing the plastic material after the step of fixing the electrode and the connection conductive portion.

  According to this configuration, the first contact surface and the second contact surface are urged toward each other in a state where the conductive plastic material is provided between the first contact surface and the second contact surface. Therefore, the plastic material can be spread without a gap between the first contact surface and the second contact surface. Since the conductive plastic material is cured in a state where the first contact surface and the second contact surface are biased, the gas generated by the curing of the plastic material remains between the first contact surface and the second contact surface. It is difficult to prevent the remaining gas from becoming voids. As described above, since voids are reduced in the cured plastic material, a good conductive connection structure can be manufactured.

  In the step of curing the plastic material, it is preferable to cure the plastic material by supplying electric power from the power source to the electrode through the connection conductive portion.

  Since the plastic material is cured by supplying electric power from the power source to the electrodes via the connection conductive portion, it is not necessary to separately prepare an apparatus for curing the plastic material, and the connection structure can be manufactured at a low cost. In addition, since the area of the region where the plastic material is provided is not limited by the dimensions of the apparatus for curing the plastic material, it is easy to increase the area of this region. Thereby, it becomes easy to increase the contact area between the electrode and the connection conductive part, and it becomes easy to increase the conductivity between the electrode and the connection conductive part.

In the step of providing the plastic material, using the liquid material containing conductive particles and a binder as the plastic material, adjusting the viscosity of the liquid material to 25000 centipoise or more, the liquid material is placed on the one contact surface. Apply.
In this way, it is difficult for the liquid material to sag, so that the workability can be improved and the connection structure can be manufactured efficiently.

In the step of providing the plastic material, a step of applying the liquid material to the one contact surface using a liquid material containing conductive particles and a binder as the plastic material, and fixing the electrode and the connection conductive portion. The step of providing the plastic material and the electrode and the connection conductive portion are fixed so that the viscosity of the liquid when the first contact surface and the second contact surface are in contact with each other is 300000 centipoise or less. The viscosity of the liquid material may be adjusted in at least one of the steps.
If it does in this way, it will become easy to distribute a plastic material without a clearance gap between a 1st contact surface and a 2nd contact surface.

After the step of fixing the electrode and the connection conductive portion, the resistance value between the electrode and the connection conductive portion is measured, and the measured value of the resistance value is compared with a specified value to determine the plastic material. It is good to include the process of determining completion | finish of the process of hardening | curing.
If it does in this way, since it constructs, evaluating the resistance value of a connection structure, the quality of a connection structure is securable.

  An electrode repair method of the present invention is an electrode repair method that is attached to a structure and is electrically connected to a power source, the step of removing a degraded portion of the electrode and forming a first contact surface; Preparing a repair material having a second contact surface facing the first contact surface, and providing a conductive plastic material on at least one of the first contact surface and the second contact surface; After the step of providing the plastic material, the step of urging the first contact surface and the second contact surface toward each other to fix the electrode and the repair material, the electrode and the repair material, And a step of curing the plastic material by heating the plastic material by supplying electric power from the power source to the electrode via the repair material.

  In this way, the plastic material can be distributed between the first contact surface and the second contact surface without any gaps for the same reason as in the method for manufacturing the connection structure of the present invention, and the filler is filled with gas. The voids due to the remaining of are reduced. Therefore, a reduction in the contact area between the electrode from which the deteriorated portion has been removed and the repair material is avoided, and the electrode can be repaired to a good conductive electrode. Since the plastic material is cured by supplying power from the power source to the electrode through the connection conductive portion, the electrode can be repaired at a low cost, and the contact area between the electrode from which the deteriorated portion has been removed and the repair material is increased. It becomes easy.

After the step of fixing the electrode and the repair material, the resistance value between the electrode and the repair material is measured, and the measured value of the resistance value is compared with a specified value to cure the plastic material. It is good to include the process of determining completion | finish of the process to make.
If it does in this way, since it constructs, evaluating the resistance value of a repair part, the quality of the repaired electrode can be ensured.

  According to the connection structure of the present invention, it is possible to avoid a reduction in the contact area between the electrode and the terminal, so that it is possible to improve the conductivity between the electrode and the terminal.

It is a mimetic diagram showing a schematic structure of an electric furnace concerning a 1st embodiment. (A) is a schematic diagram which expands and shows a connection structure, (b) is A-A 'arrow sectional drawing of (a). (A) is sectional drawing which expands and shows a filler, (b) is a reference drawing of a filler. (A)-(c) is process drawing which shows the manufacturing method of a connection structure roughly. (A)-(c) is process drawing which shows the electrode repair method roughly. (A)-(c) is process drawing which continues from FIG.4 (c). (A) is a test piece 4A of Comparative Example 1, (b) is a test piece 4B of Example 1, (c) is a test piece 4C of Comparative Example 2, and (d) is a test piece 4D of Example 2. It is a schematic diagram which shows. It is a graph which shows the comparison with the electrical resistance of the comparative example 1, and the electrical resistance of Example 1. FIG. It is a graph which shows the comparison with the electrical resistance of the comparative example 2, and the electrical resistance of Example 2. FIG. It is a figure which shows the modification 1 of a connection structure. (A), (b) is a figure which shows the modifications 2 and 3 of a connection structure. It is a flowchart which shows the modification of the construction method of a filler.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the drawings used for explanation, in order to show characteristic parts in an easy-to-understand manner, dimensions and scales of structures in the drawings may be different from actual structures. In the embodiment, the same components are illustrated with the same reference numerals, and detailed description thereof may be omitted.

[First Embodiment]
FIG. 1 is a schematic diagram showing a schematic configuration of the electric furnace 1 according to the first embodiment, FIG. 2A is a schematic diagram showing an enlarged connection structure in the first embodiment, and FIG. It is AA 'arrow sectional drawing in a).

  As shown in FIG. 1, an electric furnace (structure) 1 is attached to a furnace body 10 including a furnace vessel 10a and a lid 10b, a furnace bottom electrode (electrode) 12 attached to the bottom of the furnace vessel 10a, and a lid 10b. A furnace top electrode 15. A portion surrounded by the furnace vessel 10a and the lid 10b serves as a storage chamber 11 for storing a workpiece Q such as incinerated ash. The furnace vessel 10a is provided with a discharge port 18 through which the processed object Q is discharged. The furnace bottom electrode 12 and the furnace top electrode 15 are electrically connected to the DC power source 3.

  The electric furnace 1 generally operates as follows. When electric power is supplied from the DC power source 3 to the furnace bottom electrode 12 and the furnace top electrode 15, plasma (or arc discharge) is generated between the furnace bottom electrode 12 and the furnace top electrode 15 in the storage chamber 11. The workpiece Q stored in the storage chamber 11 is heat-treated by heat caused by plasma (or arc discharge), and is discharged from the discharge port 18 in a molten state, for example. Hereinafter, the components of the electric furnace 1 will be described in detail.

  The furnace top electrode 15 is electrically connected to the DC power source 3 via the cable 17. The furnace top electrode 15 is a part that functions as a cathode, for example. In general, the cathode is more consumed than the anode. Here, in order to improve maintainability, the furnace top electrode 15 is detachably attached to the furnace body 10. Specifically, a through hole is provided in the lid 10b, and an insulating sleeve 16 is fitted in the through hole. The insulating sleeve 16 has a substantially cylindrical shape with a tapered outer shape. The furnace top electrode 15 is inserted into the inside of the insulating sleeve 16, and one end projects into the storage chamber 11.

  The furnace bottom electrode 12 is a part that functions as an anode, for example. The furnace bottom electrode 12 is made of, for example, carbon and has a substantially cylindrical outer shape. Since carbon has a melting point higher than that of metal or the like, heat resistance can be improved by using the bottom electrode 12 made of carbon. The dimensions of the furnace bottom electrode 12 are, for example, a diameter of a cross section of about several hundred mm and an axial length of about several thousand mm. The furnace bottom electrode 12 is fixed in a state where electricity can be passed through the interior of the housing chamber 11.

  As shown in FIG. 2A, a furnace bottom flange 191 is fixed to the bottom of the furnace vessel 10a. An electrode flange 192 is attached to the furnace bottom electrode 12. The electrode flange 192 is joined to the furnace bottom flange 191 with a bolt, a nut, or the like. The furnace bottom electrode 12 is supported by the support portion 19 including the furnace bottom flange 191 and the electrode flange 192.

  The furnace bottom electrode 12 is connected and connected to the terminal 13 as a connection conductive portion by the connection structure 2 to which the present invention is applied. The terminal 13 is electrically connected to the DC power source 3 via the cable 14. The current supplied from the DC power source 3 to the furnace bottom electrode 12 is, for example, about 1000 A to 10000 A, depending on the processing capacity of the electric furnace 1. The furnace bottom electrode 12 is heated to, for example, about 400 ° C. by heat generated during operation of the electric furnace 1.

  As shown in FIG. 2B, the terminal 13 constitutes a part of a clamp that sandwiches the furnace bottom electrode 12. The terminal 13 of the present embodiment has a substantially cylindrical shape surrounding the outer periphery of the furnace bottom electrode 12 in an open ring shape. The terminal 13 is made of a conductive material selected as appropriate, and here is made of copper. As for the terminal 13, both the open ends protrude toward the outside. The protruding both end portions are urged in a direction approaching each other and joined by a fixing means.

  The fixing means of the present embodiment includes a bolt 21, a nut 22, and a spring washer 23. Bolts 21 and nuts 22 fasten both ends of the terminal 13 via spring washers 23. The terminal 13 is urged in a direction in which the inner diameter decreases. The spring washer 23 only needs to have an elongation amount enough to absorb a volume change accompanying the curing and evaporation of the binder described below. The amount of elongation required for the spring washer 23 is estimated in advance based on the estimated value of the volume change of the binder, and the characteristics of the spring washer 23 may be set.

A filler 20 is provided so as to fill the space between the furnace bottom electrode 12 and the terminal 13. The furnace bottom electrode 12 and the terminal 13 are in contact with each other via the filler 20. The contact surface on the furnace bottom electrode 12 side (first contact surface 12 a) is the outer peripheral surface of the furnace bottom electrode 12, and the contact surface on the terminal 13 side (second contact surface 13 a) is the inner peripheral surface of the terminal 13. The contact area through the filler 20 is, for example, about 300 cm ² . The thickness of the filler 20 is set to such an extent that the unevenness of the first contact surface 12a and the second contact surface 13a is filled, for example, about 0.5 mm.

  3A is a cross-sectional view schematically showing the filler 20 in an enlarged manner, and FIG. 3B is a cross-sectional view when the terminal and the furnace bottom electrode are not energized. . As shown in FIG. 3A, the filler 20 includes conductive particles 201 and a cured binder 202. The conductive particles 201 are connected between the furnace bottom electrode 12 and the terminal 13 and are in contact with each other. That is, the furnace bottom electrode 12 and the terminal 13 are electrically connected via the conductive particles 201.

  The binder 202 is made of a material whose hardness in a cured state is lower than that of the furnace bottom electrode 12 and the terminal 13. The volume resistivity of the filler 20 is preferably 0.5 Ωcm or less. If the volume resistivity is 0.5 Ωcm or less, the contact resistance between the conductors is about the same as or less than the volume resistivity of the conductor itself. As the thickness of the filler 20 decreases, the resistance value in the thickness direction of the filler 20 decreases, and the substantial resistance value of the connection structure depends on the contact resistance rather than the volume resistivity of the filler 20. In order to reduce the substantial resistance value of the connection structure, the decrease in the contact resistance value with the furnace bottom electrode 12 and the terminal 13 due to the difference in material according to the thickness of the filler 20 is the volume resistance due to the difference in material. It is better to select a material that is larger than the rate decrease. The contact between metals of different materials is unstable, but the contact can be stabilized by using a filler.

  Since the furnace bottom electrode 12 and the terminal 13 are biased toward each other, bubbles are unlikely to remain between the furnace bottom electrode 12 and the terminal 13. However, it is practically difficult not to leave bubbles completely, and in reality, bubbles may remain between the furnace bottom electrode 12 and the terminal 13. If the terminal and the furnace bottom electrode are not energized, the conductor particles 201 are distributed avoiding the bubbles G as shown in FIG. Therefore, the part of the bubble G does not function as a conduction path between the furnace bottom electrode 12 and the terminal 13, and the resistance between the furnace bottom electrode 12 and the terminal 13 is increased by the amount of the bubble G.

  As shown in FIG. 4 (a), in the present invention, the furnace bottom electrode 12 and the terminal 13 are urged toward each other. Therefore, if bubbles G remain, the conductor particles 201 are urged by the urging force F. Is pressed toward the bubble G. As a result, the conductive particles 201 enter the inside of the bubbles G, and the conductive particles 201 are continuously distributed between the furnace bottom electrode 12 and the terminals 13 even in the portion of the bubbles G. Therefore, the furnace bottom electrode 12 and the terminal 13 can be electrically connected even in the part of the bubble G, and the increase in resistance due to the bubble G can be avoided.

  In the connection structure 2 configured as described above, the furnace bottom electrode 12 and the terminal 13 are biased in a direction in which they approach each other. Accordingly, the furnace bottom electrode 12 and the terminal 13 are in close contact with the filler 20 by following the volume change of the filler 20 and the like, and the contact area between the furnace bottom electrode 12 and the terminal 13 is prevented from being reduced. Is done. Therefore, current concentration due to a decrease in contact area is avoided, and deterioration of the connection structure 2, the furnace bottom electrode 12, and the terminal 13 due to power concentration is significantly reduced.

[Second Embodiment]
Next, based on the structure of the connection structure 2 of 1st Embodiment, the manufacturing method of a connection structure is demonstrated as 2nd Embodiment. 4A to 4C are process diagrams schematically showing a method for manufacturing the connection structure of the second embodiment. Prior to the production of the connection structure 2, first, the furnace bottom electrode 12 is fixed to the bottom of the furnace vessel 10a by the support portion 19 and the like as shown in FIG.

  Next, as shown in FIG. 4B, a conductive plastic material 20 a is applied to the first contact surface 12 a that is a portion that contacts the terminal 13 in the furnace bottom electrode 12. The plastic material 20a may be applied to the second contact surface 13a, which is the portion that contacts the furnace bottom electrode 12 in the terminal 13, or the plastic material 20a may be applied to the first contact surface 12a and the second contact surface 13a. Good.

  In the present embodiment, a liquid material in which conductive particles and a binder are mixed is used as the plastic material 20a. If the viscosity of the liquid at the time of application is 25000 cps or more, sagging during application can be reduced or prevented. If the plastic material 20a is prepared so that the viscosity of the liquid material at the time when the terminal 13 is brought into contact with the furnace bottom electrode 12 in a process described later is 300,000 cps or less, the applied liquid material can be made uneven or uneven on the first contact surface. 2 Unevenness on the contact surface can be spread.

  Examples of the conductive particles include metal particles made of a single metal such as silver, copper, nickel, gold, platinum, or an alloy of two or more metals, a mixture of two or more kinds of metal particles, particles made of carbon, carbon particles, Examples thereof include a mixture with metal particles. As the binder, either an organic binder (for example, grease) or an inorganic binder (for example, sodium silicate) may be adopted. When an organic binder such as grease is used, drying of the plastic material during operation can be reduced and workability can be improved as compared with the case of using an inorganic binder. Moreover, generally an organic binder is cheaper than an inorganic binder, and can reduce material cost.

  In the present embodiment, a mixture of silver particles, sodium silicate, and water is used for the plastic material 20a. Thus, when an inorganic binder is used, the water-soluble plastic material 20a can be obtained, and the viscosity of the plastic material 20a can be easily adjusted by adjusting the water content. In addition, since the inorganic binder is less likely to be altered or thermally decomposed by heating as compared to the organic binder, it is possible to prevent the deterioration of the characteristics accompanying the temperature rise and the generation of voids due to the thermal decomposition.

  Next, as shown in FIG. 4C, the furnace bottom electrode 12 is tightened by a clamp including the terminal 13 (see FIG. 2B), so that the terminal 13 is placed on the furnace bottom electrode 12 from above the plastic material 20a. Press to make contact. Before the terminal 13 and the furnace bottom electrode 12 are brought into contact with each other, when the plastic material 20a is dried to such an extent that it does not flow, or so that the plastic material 20a spreads between the terminal 13 and the furnace bottom electrode 12 In order to reduce the viscosity of the plastic material 20a, moisture may be applied to the applied plastic material by spraying or the like.

  Further, the viscosity may be intentionally different between the time when the plastic material 20 a is applied and the time when the terminal 13 is brought into contact with the furnace bottom electrode 12. For example, the plastic material 20a is prepared to have a high viscosity (250,000 cps or more) that can prevent sagging when the plastic material 20a is applied. When the terminal 13 is brought into contact with the furnace bottom electrode 12, water is added to the plastic material 20a so that the plastic material 20a has a low viscosity (300,000 cps or less) enough to spread between the furnace bottom electrode 12 and the terminal 13. To do. Thereby, it is possible to both prevent the sagging of the plastic material 20a and spread the plastic material 20a between the terminal 13 and the furnace bottom electrode 12 without a gap.

  Then, the cable 14 is connected to the terminal 13 and the cable 14 is connected to the DC power source 3. The furnace top electrode 15 shown in FIG. 1 is attached in advance, and the furnace top electrode 15 is electrically connected to the DC power source 3 via the cable 17. Then, power is supplied from the DC power source 3 to the terminal 13, and a current P is caused to flow through the furnace bottom electrode 12. When the current P flows, the terminal 13 near the plastic material 20a, the furnace bottom electrode 12, and the plastic material 20a themselves generate heat, and the plastic material 20a is dried and cured by this heat.

  Here, the time change of the curing degree of the plastic material 20a is controlled by controlling the value of the current P over time. Specifically, the current P is controlled so as to set the curing rate of the plastic material 20a gently so that the evaporation gas of the plastic material 20a is pushed out from between the furnace bottom electrode 12 and the terminal 13 in the initial stage of dry curing. Further, the current P is set higher than that in the initial stage in order to cure the plastic material 20a to such an extent that the water-solubility of the plastic material 20a is lost in the latter stage of dry curing. In this way, the plastic material 20a is dried and cured to form the filler 20, and the connection structure 2 is manufactured. Thereby, the electric furnace 1 including the connection structure 2 is obtained.

  In the manufacturing method of the second embodiment as described above, since the terminal 13 is biased toward the furnace bottom electrode 12, the applied plastic material 20 a has no gap between the furnace bottom electrode 12 and the terminal 13. Spread wet. Moreover, since the plastic material 20a is pressed, the evaporation gas generated in the process in which the plastic material 20a is dried and hardened hardly remains. Since the generation of voids in the dry-cured filler 20 is significantly reduced, the contact area between the furnace bottom electrode 12 and the terminal 13 can be maximized. As for the remaining evaporated gas (bubbles), since the plastic material 20a is pressed, the conductive particles enter the bubbles, and high resistance due to the bubbles is avoided. Thus, the conductivity of the connection structure 2 can be improved.

  The furnace bottom electrode 12 made of carbon has higher heat resistance than that made of metal, but the surface flatness may be lowered. Even when the surface of the furnace bottom electrode 12 is uneven, the unevenness can be filled with the plastic material 20a, so that the contact area between the furnace bottom electrode 12 and the terminal 13 can be increased. It is possible to achieve both improvement in electrical conductivity and improvement in heat resistance of the furnace bottom electrode 12.

  Since the plastic material 20a containing an inorganic binder is employed, the viscosity of the plastic material 20a can be easily adjusted by adjusting the water content. Therefore, dripping at the time of application can be prevented, and the terminal 13 and the furnace bottom electrode 12 can be spread without a gap, and both can be achieved. Therefore, workability can be improved, the contact area can be maximized, and the favorable conductive connection structure 2 can be efficiently manufactured.

  In addition, the plastic material 20a is dried and cured by applying a current P to the applied plastic material 20a using a structure (electric furnace 1) provided with the connection structure 2. Therefore, it is not necessary to separately prepare a drying device for the plastic material 20a, and the connection structure 2 can be manufactured at low cost.

  Since the drying device is unnecessary, the size of the drying device is not limited, and the plastic material 20a can be easily dried and cured even when the application area of the plastic material 20a is increased. Therefore, it is easy to increase the contact area between the furnace bottom electrode 12 and the terminal 13, and it is easy to improve the conductivity of the connection structure 2. Further, since the value of the current P can be controlled, the degree of curing of the plastic material 20a in the drying and curing process can also be controlled.

[Third Embodiment]
Next, an embodiment of the electrode repair method of the present invention will be described as a third embodiment. FIGS. 5A to 5C and FIGS. 6A to 6C are process diagrams schematically showing the electrode repair method of the third embodiment.

  As shown to Fig.5 (a), the deterioration part 12b may arise in the furnace bottom electrode 12 with use of a structure (electric furnace 1). The deteriorated portion 12b is, for example, a portion that has been altered by heat or a portion that has been roughened by contact with a clamp. In order to repair such a furnace bottom electrode 12, first, an accessory such as the connection structure 2 connected to the furnace bottom electrode 12 is removed.

  Next, as shown in FIG. 5B, in the state where the furnace bottom electrode 12 is fixed to the furnace vessel 10a, the end 12c of the furnace bottom electrode 12 including the deteriorated part 12b is cut off. Since the furnace bottom electrode 12 is fixed to the furnace vessel 10a, there is a limit to improving the flatness of the cut surface of the fixed part 12d of the furnace bottom electrode 12 from which the end 12c is cut off. Further, when the carbon furnace bottom electrode 12 is cut, unevenness may be caused due to crystallinity.

  Next, as shown in FIG. 5C, a conductive repair material 12e having a second contact surface in contact with the first contact surface is prepared using the cut surface of the fixing portion 12d as the first contact surface. The repair material 12e is made of the same material (here, made of carbon) as the furnace bottom electrode 12, for example. And after apply | coating the plastic material 20b to the 2nd contact surface of the repair material 12e, a 2nd contact surface is made to contact the 1st contact surface of the fixing | fixed part 12d via the plastic material 20b. As the plastic material 20b, the plastic material described in the first and second embodiments can be appropriately selected and used. Further, the plastic material 20b may be applied to the first contact surface of the fixed portion 12d, or may be applied to the first contact surface and the second contact surface.

  Next, as shown in FIG. 6A, the repair material 12e is fixed to the fixing portion 12d in a state where the fixing portion 12d and the repair material 12e are urged in a direction approaching each other. Here, the electrode flange 192 is attached to the repair material 12e. Then, the electrode flange 192 is fixed to the furnace bottom flange 191 fixed to the bottom of the furnace vessel 10a with a bolt, a nut or the like. In order to fix the electrode flange 192 to the furnace bottom flange 191, for example, a spring 193 such as a helical spring is inserted into the bolt, and the bolt is attached so that the spring 193 is sandwiched between the head of the bolt and the electrode flange 192. Then, the fixing part 12d and the repair material 12e are urged by fitting the bolt and the nut.

  Next, as shown in FIG. 6 (b), the plastic material 20a is attached to the repair material 12e in the same manner as the terminal 13 is contacted and fixed to the furnace bottom electrode 12 via the plastic material 20a in the second embodiment. The terminal 13 is brought into contact with and fixed therethrough. The plastic material 20a may be the same composition as the plastic material 20b or a different composition.

  Then, the cable 14 is connected to the terminal 13 and the cable 14 is connected to the DC power source 3. The furnace top electrode 15 shown in FIG. 1 is attached in advance, and the furnace top electrode 15 is electrically connected to the DC power source 3 via the cable 17. Then, a current P is supplied from the DC power supply 3 to the terminal 13. When the current P flows from the terminal 13 to the repair material 12e and the fixing portion 12d, the terminal 13, the furnace bottom electrode 12, and the plastic material 20a themselves in the vicinity of the plastic material 20a generate heat, and the plastic material 20a is dried and cured by this heat. Further, the fixing portion 12d, the repair material 12e, and the plastic material 20b themselves in the vicinity of the plastic material 20b generate heat, and the plastic material 20b is dried and cured by this heat.

  About the process of hardening the plastic materials 20a and 20b, it can carry out similarly to 2nd Embodiment. The fixing portion 12 d comes into contact with the repair material 12 e through the filler 24 obtained by drying and curing the plastic material 20 b, and the repair material 12 e comes into contact with the terminal 13 through the filler 20. In this way, by repairing the deteriorated furnace bottom electrode 12, the fixed portion 12d and the repair material 12e can function as a repaired furnace bottom electrode.

  In the electrode repair method as described above, the structure for connecting the fixing portion 12d and the repair material 12e is one mode of the connection structure of the present invention in which the repair material 12e is the connection conductive portion. In this case, it is avoided that the contact area decreases due to the volume change of the filler 24. Therefore, current concentration due to a decrease in contact area is avoided, and deterioration of the connection structure, the fixing portion 12d, and the repair material 12e due to power concentration is significantly reduced.

  In addition, for the same reason as in the second embodiment, it is possible to maximize the contact area between the fixing portion 12d and the repairing material 12e because the generation of voids in the dry-cured filler 24 is significantly reduced. The conductivity of the furnace bottom electrode after repair can be improved.

  Since the repair is performed by leaving a part of the furnace bottom electrode 12 as the fixing portion 12d, the repair can be performed without removing the furnace bottom electrode 12, and a large repair is avoided. Moreover, it becomes possible to make the furnace bottom electrode after repair function until an exchange opportunity such as periodic maintenance, and it is avoided that the replacement of the furnace bottom electrode leads to a short maintenance cycle.

  Since a part of the furnace bottom electrode 12 is cut away in a state where the furnace bottom electrode 12 is fixed to the furnace vessel 10a, there is a limit to flattening the cut surface of the fixed part 12d. However, since the unevenness of the cut surface of the fixed portion 12d can be filled with the plastic material 20b, the contact area between the fixed portion 12d and the repair material 12e can be increased, and the quality of the bottom electrode after repair can be ensured and repaired. Both workability can be achieved.

  Moreover, since the plastic material 20a is dried and cured by applying a current P to the applied plastic material 20a, 20b using the structure (electric furnace 1) provided with the furnace bottom electrode 12 to be repaired, the cost is low. The furnace bottom electrode 12 can be repaired. Since the drying device is unnecessary, the size of the drying device is not limited, the contact area between the fixing portion 12d and the repair material 12e can be easily increased, and the conductivity of the connection structure can be improved.

[Example]
Next, the characteristic of the Example of the connection structure which concerns on this invention is demonstrated. 7A shows the test piece 4A of Comparative Example 1, FIG. 7B shows the test piece 4B of Example 1, FIG. 7C shows the test piece 4C of Comparative Example 2, and FIG. 7D shows the Example. FIG. 8 is a graph showing a comparison between the electrical resistance of Comparative Example 1 and the electrical resistance of Example 1, and FIG. 9 is the electrical resistance of Comparative Example 2 and the electrical resistance of Example 2. FIG. It is a graph which shows the comparison with resistance. 8 and 9, the vertical axis represents the electric resistance value (mΩ), and the horizontal axis represents the heating temperature.

A test piece 4A of Comparative Example 1 shown in FIG. 7A has a configuration in which carbon blocks 43 and 44 are sandwiched between copper plates 41 and. The carbon blocks 43 and 44 are in direct contact with each other. The carbon blocks 43 and 44 are 100 mm square bulk.
The test piece 4B of Example 1 shown in FIG. 7B is an application of the present invention. The test piece 4B differs from the comparative example 1 in that the carbon blocks 43 and 44 are in indirect contact with each other via the silver paste 45. The silver paste 45 is a plastic material containing conductive particles made of silver and an inorganic binder made of sodium silicate. The test piece 4B has a configuration corresponding to the furnace bottom electrode after repair described in the third embodiment.

  An ammeter and a voltmeter are attached to the test piece 4A of Comparative Example 1 and the test piece 4B of Example 1, respectively. A pair of terminals of the ammeter are attached to the copper plates 41 and 42. A pair of terminals of the voltmeter are attached to one of the carbon blocks 43 and 44 with the contact surface sandwiched therebetween. The electric resistance at a predetermined interval across the contact surfaces of the carbon blocks 43 and 44 was obtained from the measured value of the ammeter and the measured value of the voltmeter.

Plots A ₁ and A ₂ shown in FIG. 8 are the electric resistances of Comparative Example 1, and both are values at room temperature (25 ° C.). Plot A ₁ is a value in a state where the carbon blocks 43 and 44 are not urged toward each other, and a plot A ₂ is a value in a state where the carbon blocks 43 and 44 are urged at a pressure of 24 kg / cm ^2. It is. The electrical resistance of the plot _{A 1} is 0.39Emuomega, the electrical resistance of the plot _{A 2} is 0.11Emuomega. The electric resistance is lowered by urging the carbon blocks 43 and 44.

Plots B _{1 to} B ₅ shown in FIG. Plots B ₁ and B ₂ are values at normal temperature (25 ° C.), and are values before the silver paste 45 is dried and cured. Plot _{B 1} represents the value of the urging to have a state of carbon blocks 43, 44, _{B 2} is the value of a state in which urged by a pressure of 24 kg / cm ^2. The electrical resistance of the plot _{B 1} represents a 0.50Emuomega, the electrical resistance of the plot _{B 2} is 0.20Emuomega. The electric resistance is lowered by urging the carbon blocks 43 and 44. Plots B _{3 to} B ₅ are values after the drying process or drying and hardening of the silver paste 45. Plot _{B 3,} the electrical resistance is the heating temperature is 70 ° C. is 0.07Emuomega. Plot _{B 4,} the electrical resistance heating temperature is 250 ° C. is 0.05Emuomega. Plot _{B 5} is a value obtained by cooling to 25 ° C. After heating to 250 ° C. electrical resistance is 0.07Emuomega.

  In the test piece 4B of Example 1, the electrical resistance at the time of heating or after heating is reduced to about half that of the test piece 4A of Comparative Example 1. From this, it is understood that the conductivity of the connection structure is improved by applying the present invention. When repairing an actual structure, the flatness of the contact surface is likely to be lower than that of the test piece, and the electrical resistance when the present invention is not applied is considered to be higher than that of Comparative Example 1. On the other hand, when the present invention is applied, the flatness of the contact surface is less likely to affect the electric resistance, so that it is considered that an effect larger than the difference between Comparative Example 1 and Example 1 is actually obtained.

A test piece 4C of Comparative Example 2 shown in FIG. 7C has a configuration in which a carbon block 44 is sandwiched between copper plates 41 and 42. The copper plates 41 and 42 and the carbon block 44 are in direct contact. A copper plate 46 is provided in contact with the side opposite to the carbon block 44 of the copper plate 41.
The test piece 4D of Example 2 shown in FIG. 7D is an application of the present invention. The test piece 4D differs from the test piece 4C in that the copper plate 41 is indirectly in contact with each other via the carbon block 44 and the silver paste 45. The test piece 4D has a configuration corresponding to the connection structure described in the first embodiment.

  An ammeter and a voltmeter are attached to the test piece 4C of Comparative Example 2 and the test piece 4C of Example 2, respectively. A pair of terminals of the ammeter are attached to the copper plate 42 and the copper plate 46. A pair of terminals of the voltmeter are attached to the other side of the copper plate 41 and the carbon block 44 with the contact surface sandwiched therebetween. The electric resistance at a predetermined interval across the contact surface between the copper plate 41 and the carbon block 44 was obtained from the measured value of the ammeter and the measured value of the voltmeter.

Plots C ₁ and C ₂ shown in FIG. 9 are electric resistances of Comparative Example 2, and both are values at normal temperature (25 ° C.). Plot C ₁ is the value of the state that is not biased in a direction toward the copper plate 41 and the carbon block 44 with each other, plot C ₂ is the value of a state in which urged by a pressure of 24 kg / cm ^2. The electrical resistance of the plot _{C 1} is 25.53Emuomega, the electrical resistance of the plot _{C 2} is 13.52Emuomega. The electrical resistance is lowered by energizing the copper plate 41 and the carbon block 44.

Plots D _{1 to} D ₆ shown in FIG. Plots D ₁ and D ₂ are values at normal temperature (25 ° C.), and are values before the silver paste 45 is dried and cured. Plot _{D 1,} the value of the state has been urging the copper plate 41 and carbon block 44, _{D 2} is the value of a state in which urged by a pressure of 24 kg / cm ^2. The electrical resistance of the plot _{D 1} is 18.84Emuomega, the electrical resistance of the plot _{D 2} is 1.83Emuomega. By urging the copper plate 41 and the carbon block 44, the electrical resistance is greatly reduced. Plots D _{3 to} D ₆ are values after the drying process or drying and hardening of the silver paste 45. Plot _{D 3,} the electrical resistance is the heating temperature is 70 ° C. is 0.27Emuomega. Plot _{D 4,} the electrical resistance heating temperature is 0.99 ° C. is 0.13Emuomega. Plot _{D 5,} the electric resistance is heating temperature is 250 ° C. is 0.13Emuomega. Plot _{D 6} is a value obtained by cooling to 25 ° C. After heating to 250 ° C. electrical resistance is 0.13Emuomega.

  In the test piece 4D of Example 2, the electrical resistance at the time of heating or after heating is reduced to about 1/10 of the test piece 4C of Comparative Example 2. From this, it can be seen that by applying the present invention, the conductivity of the connection structure is remarkably improved.

  The technical scope of the present invention is not limited to the above embodiment. Various modifications are possible without departing from the gist of the present invention. For example, although the spring washer is used as the biasing member in the first embodiment, a helical spring or the like may be adopted as the biasing member instead of the spring washer. Alternatively, the terminal 13 may be fastened and joined so that the terminal 13 develops an elastic repulsive force, and the terminal 13 may be an urging member. In the third embodiment, the helical spring is used as the biasing member, but a plate spring such as a spring washer may be used instead of the helical spring.

The connection structure of the present invention can be applied to other than the electric furnace electrode. In particular, the present invention is applied to a device in which a current of 10 A or more flows between the electrode and the terminal, a device in which the electrode is heated in a temperature range of 50 ° C. to 400 ° C., and a device in which the contact area between the electrode and the terminal is 5 cm ² or more. When the connecting structure of the invention is applied, the remarkable effect of the present invention can be obtained.

Specifically, for example, the present invention can be applied to the connection of an electrode of a thermal spraying device, a power supply electrode for a solar cell, and the like. As an example of a power supply electrode for a solar cell, a contact area with a connection conductive portion is about 5 cm ² , an operation temperature is about 200 ° C., and a current value flowing during operation is about 15 A. About the material of an electrode or a connection conductive part, it selects suitably according to the use etc. of various apparatuses. For example, the electrode and the connection conductive part may be copper, stainless steel, general structural rolled steel (SS material), aluminum, or the like.

A plastic material using an organic binder and a plastic material using an inorganic binder may be properly used for each portion to be applied. In addition to the technique of applying a liquid plastic material, for example, a technique of attaching a plastic material molded into a sheet shape may be employed. In this case, the plastic material may be selected so that the sheet-like plastic material is softened by heat and spreads between the furnace bottom electrode 12 and the terminal 13.
The electrode repairing method of the present invention can also be applied to electrodes other than the electrodes to which the connecting structure of the present invention is applied. Also in this case, the effect of improving the conductivity of the electrode after repair can be obtained.

  Hereinafter, modifications according to the present invention will be described. FIG. 10 is a cross-sectional view schematically showing the configuration of the connection structure 2B of the first modification. As shown in FIG. 10, Modification 1 is different from the first embodiment in that the terminal 13 </ b> B is connected to the furnace bottom flange 191. The terminal 13B includes a cylindrical clamp portion that surrounds the furnace bottom electrode 12, and an end portion of the clamp portion is a flange portion that protrudes outside the cylindrical shape.

  The furnace bottom flange 191 is fixed to the bottom of the furnace vessel 10 a and supports the furnace bottom electrode 12 via an insulating material 26. The bottom flange 191 and the flange portion of the terminal 13 sandwich an insulating material 25 and are fixed to each other by a bolt 21 and a nut 22. The force with which the clamp portion of the terminal 13B clamps the furnace bottom electrode 12 is set to such an extent that good conductivity can be obtained as a connection structure. For example, the force at which the furnace bottom flange 191 clamps the furnace bottom electrode 12 is set smaller. The In other words, the force that supports the weight of the furnace bottom electrode 12 is mainly borne by the furnace bottom flange 191. In this way, damage, cracking, or breakage of the furnace bottom electrode 12 due to the force with which the terminal 13B tightens the furnace bottom electrode 12 is significantly reduced.

  FIG. 11A is a cross-sectional view schematically showing the configuration of the connection structure 2C of the second modification. Modification 2 is different from the first embodiment in that a measuring instrument 27 for measuring a resistance value between the furnace bottom electrode 12 and the terminal 13 is provided. The measuring device 27 is attached, for example, in the process of manufacturing the connecting structure 2C, and the measured value is used for setting the construction conditions for forming the filler 20 and determining the success or failure of the construction. Further, the measurement result of the measuring instrument 27 is used for managing the degree of deterioration associated with the use of the connecting structure 2C, and can be used, for example, for determining repair timing.

  As shown in FIGS. 11 (b) and 11 (c), the configuration provided with a resistance value measuring device is also applicable to a connection structure manufactured by the electrode repair method of the present invention. For example, in the connection structure of Modification 3 shown in FIG. 11B, one of the inspection terminals of the measuring instrument 27 is connected to the terminal 13 that sandwiches the repair material 12 d and the filler 20. The other inspection terminal of the measuring device 27 is connected to a fixing portion 12d that sandwiches the repair material 12e and the filler 24. By measuring the resistance value between the pair of inspection terminals of the measuring instrument 27, the total resistance of the fillers 20, 24 can be evaluated.

  In the connection structure of Modification 4 shown in FIG. 11C, the pair of inspection terminals of the measuring instrument 27 is connected to the fixing portion 12 d and the repair material 12 e that sandwich the filler 24. By measuring the resistance value between the pair of inspection terminals of the measuring instrument 27, the resistance of the filler 24 can be evaluated.

  Next, a modified example of the filler construction method will be described with respect to the method for manufacturing the connection structure according to the present invention or the electrode repair method according to the present invention. In the present modification, construction condition setting and construction success / failure determination are performed using the measurement result of the measuring instrument 27.

FIG. 12 is a flowchart schematically showing a construction method of the filler. In order to construct the filler, members necessary for manufacturing the connection or repairing the electrode are prepared and the construction is started (step S1).
Next, a plastic material is applied to the first contact surface and / or the second contact surface, the first contact surface and the second contact surface are brought into contact with each other through the plastic material, and the conditions for the construction are set (step S2). . The conditions of construction are, for example, the magnitude of the urging force that acts between the first contact surface and the second contact surface, the target value of the degree of cure of the plastic material, the curing time, the value of the current that flows through the plastic material, and the like.

Next, the resistance value is measured while curing the plastic material stepwise or continuously (step S3).
Next, it is determined whether or not the resistance value is lower than a specified value (step S4). The specified value is determined from the contact area between the furnace bottom electrode and the terminal, or the contact area between the fixed part of the furnace bottom electrode and the repair material. If the resistance value is lower than the specified value, the construction is deemed successful and the construction is completed (step S5). When the resistance value is higher than the specified value, the process returns to step S2, the execution conditions are reset, the execution is restarted, and steps S2 to S5 are repeated until the resistance value becomes lower than the specified value.
If it does in this way, since it constructs, evaluating the resistance value of a connection structure, the quality of a connection structure is securable.

DESCRIPTION OF SYMBOLS 1 ... Electric furnace (structure), 2, 2B, 2C, 2D ... Connection structure, 3 ... DC power supply,
4A to 4D ... test piece, 10 ... furnace body, 10a ... furnace vessel, 10b ... lid,
11 ... storage chamber, 12 ... furnace bottom electrode, 12a ... first contact surface,
12b ... deteriorated part, 12c ... end part, 12d ... fixed part,
12e ... repair material (connection conductive part), 13 ... terminal (connection conductive part),
13a ... second contact surface, 14 ... cable, 15 ... furnace top electrode,
16 ... insulating sleeve, 17 ... cable, 18 ... discharge port,
19 ... support part, 20 ... filler, 20a, 20b ... plastic material,
21 ... bolt (fixing means), 22 ... nut (fixing means),
23 ... Spring washer (fixing means), 24 ... Filler, 41, 42, 46 ... Copper plate,
43, 44 ... carbon block, 45 ... silver paste (plastic material),
191 ... Furnace bottom flange, 192 ... Electrode flange, 193 ... Spring,
A ₁ , A ₂ , B _{1 to} B ₅ , C ₁ , C ₂ , D _{1 to} D ₆ ... Plot
P: current, Q: workpiece

Claims (12)

A connection structure for connecting an electrode attached to a structure to a connection conductive part connected to a power source, wherein the electrode has a first contact surface and faces the connection conductive part to the first contact surface. A second contact surface is formed,
A filler filled between the first contact surface and the second contact surface and formed of a conductive plastic material;
Fixing means for urging the first contact surface and the second contact surface toward each other to fix the electrode and the connection conductive portion;
A connecting structure characterized by containing.   The connection structure according to claim 1, wherein the plastic material includes conductive particles and an inorganic binder.   The connection structure according to claim 2, wherein the inorganic binder is sodium silicate.   The connection structure according to any one of claims 1 to 3, further comprising a resistance measuring instrument that measures a resistance value of the filler. A furnace main body for storing an object to be processed;
A first electrode and a second electrode attached to the furnace body;
A connection conductive portion connected to a power source for supplying power to the first electrode;
A connection structure for connecting the first electrode and the connection conductive portion;
Including
The said connection structure is a connection structure as described in any one of Claims 1-4, The electric furnace characterized by the above-mentioned. A method for manufacturing a connection structure for connecting an electrode attached to a structure and a connection conductive portion connected to a power source, wherein a first contact surface is formed on the electrode and the connection conductive portion includes the first contact surface. A second contact surface facing the one contact surface is formed;
Providing a conductive plastic material on at least one of the first contact surface and the second contact surface;
After the step of providing the plastic material, the step of urging the first contact surface and the second contact surface toward each other to fix the electrode and the connection conductive portion;
After the step of fixing the electrode and the connection conductive portion, the step of curing the plastic material,
The manufacturing method of the connection structure characterized by including.   The connecting structure according to claim 6, wherein in the step of curing the plastic material, the plastic material is cured by supplying electric power from the power source to the electrode through the connection conductive portion and heating the plastic material. Manufacturing method.   In the step of providing the plastic material, using the liquid material containing conductive particles and a binder as the plastic material, adjusting the viscosity of the liquid material to 25000 centipoise or more, the liquid material is placed on the one contact surface. The method for producing a connection structure according to claim 6 or 7, wherein coating is performed. In the step of providing the plastic material, the liquid material is applied to the one contact surface using a liquid material containing conductive particles and a binder as the plastic material,
The step of providing the plastic material so that the viscosity of the liquid when the first contact surface and the second contact surface are in contact with each other in the step of fixing the electrode and the connection conductive portion is 300000 centipoise or less. The connection structure according to any one of claims 6 to 8, wherein the viscosity of the liquid material is adjusted in at least one of a step of fixing the electrode and the connection conductive portion. Manufacturing method.   After the step of fixing the electrode and the connection conductive part, a resistance value between the electrode and the connection conductive part is measured, and the measured value of the resistance value is compared with a specified value to determine the plastic material. The manufacturing method of the connection structure as described in any one of Claim 6 to 9 including the process of determining completion | finish of the process of hardening | curing. An electrode repair method that is attached to a structure and electrically connected to a power source,
Removing the deteriorated portion of the electrode and forming a first contact surface;
Providing a repair material having a second contact surface facing the first contact surface, and providing a conductive plastic material on at least one of the first contact surface and the second contact surface;
After the step of providing the plastic material, the step of urging the first contact surface and the second contact surface toward each other to fix the electrode and the repair material;
After the step of fixing the electrode and the repair material, the step of curing the plastic material,
The electrode repairing method characterized by including.   After the step of fixing the electrode and the repair material, the resistance value between the electrode and the repair material is measured, and the measured value of the resistance value is compared with a specified value to cure the plastic material. The electrode repair method according to claim 11, further comprising a step of determining the end of the step of causing the step to be performed.

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