JPH111758A - Method of thermal spraying on inside peripheral surface of hollow cylindrical tube - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method of thermal spraying on the inside peripheral surface of a hollow cylindrical tube, capable of facilitating the removal of unmelted grains, fumes, or dust from the surface of a sprayed coating while obviating the necessity of the arrangement of particular devices in the vicinity of the opening of the hollow cylindrical tube as an object of working. SOLUTION: A sprayed coating 11 is formed by inserting a thermal spray gun 6 into a rotating hollow cylindrical tube 1 through its upper opening and allowing a thermal spraying material 9 to adhere to an inside peripheral surface 4 and laminating it on the inside peripheral surface 4 while moving the gun 6 along the inside peripheral surface 4. Compressed air 13 is sprayed against the recessed part 2 which is peripherally provided into annular state to the plane parallel to the end face of the opening, in the part one-half the lower side of the outside peripheral surface 5 of the hollow cylindrical tube 1 from the lower opening of the hollow cylindrical tube 1. By this method, an air flow 14 ascending along the inside peripheral surface 4 is allowed to occur, by which the unmelted grains, fumes, or dust adhering to the inside peripheral surface 4 can be removed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for thermal spraying an inner peripheral surface of a hollow cylindrical tube preferably used for a hollow cylindrical tube having a concave portion on an outer peripheral surface such as an anode container for a sodium-sulfur battery. .

[0002]

2. Description of the Related Art As a processing method for forming a coating having corrosion resistance or strength on the inner peripheral surface of a hollow cylindrical tube,
2. Description of the Related Art A thermal spraying process of spraying a molten thermal spraying material, such as plasma spraying, and attaching and laminating the material on a substrate surface to form a coating film is used.

In the thermal spraying process, for example, as shown in FIG. 2, the hollow cylindrical tube 31 to be processed fixed by the fixing means 33 is rotated by a driving device (not shown) connected to the fixing means 33 to rotate. The spraying gun 36 is inserted into the hollow cylindrical tube 31 while keeping the spraying distance constant, and the spray nozzle 38 disposed at the tip of the spraying gun is inserted.
More thermal spray material 39 is used for energy 3 such as plasma jet.
7 is sprayed as thermal spray particles 40 to form a thermal spray coating 41 on the inner peripheral surface 34 of the hollow cylindrical tube 31.

[0004] However, in the thermal spraying process, since a large amount of undissolved particles, fumes (soot), etc. of the thermal spray material are present in a narrow space of the hollow cylindrical tube, the undissolved particles and the like adhere to the surface of the thermal spray coating. There was a problem. If undissolved particles adhere to the surface of the sprayed coating, not only the surface of the sprayed coating is soiled, but also the smoothness of the surface of the sprayed coating is impaired, or corrosion may occur from the adhering portion.

[0005] As a solution to this problem, there is a method of blowing compressed air from an opening of a hollow cylindrical tube on a side where a spraying gun is inserted to blow out undissolved particles and the like from the other opening, and a blower or the like to the other opening. Is conceivable, in which the undissolved particles and the like are suctioned from the other opening and removed from the space inside the hollow cylindrical tube.

However, the spraying gun is usually connected to a control means such as a robot, and when it is necessary to secure a moving area for the spraying gun and the control means, an area near both openings of the hollow cylindrical tube is required. It is difficult to provide a means for injecting compressed air or an exhaust means such as a blower. Further, the above method is effective in a thermal spraying apparatus of a type in which a thermal spray gun rotates to perform thermal spraying, but is effective in a thermal spraying apparatus of a type in which a hollow cylindrical tube is rotated to perform thermal spraying as shown in FIG. Since it is practically impossible to arrange the injection means and the exhaust means in close contact with the rotating part, the effect of removing undissolved particles and the like is insufficient.

Accordingly, the present invention provides a hollow tube capable of easily removing undissolved particles, fumes, or dust on the surface of a sprayed coating without disposing a special device near an opening of a hollow cylindrical tube to be processed. An object of the present invention is to provide a method for performing thermal spraying on an inner peripheral surface of a cylindrical tube.

[0008]

That is, according to the present invention, a rotation axis passing through the centers of the open end faces of the two openings of the hollow cylindrical pipe is defined, and the hollow cylindrical pipe is centered on the rotation axis. Rotate in the circumferential direction of the opening end face, insert a spraying gun for melting and spraying the sprayed material from one opening of the rotating hollow cylindrical tube, and then apply the spraying gun to the hollow cylindrical tube. A method for thermal spraying an inner peripheral surface of a hollow cylindrical tube that forms a thermal spray coating by adhering and laminating the thermal spray material on an inner peripheral surface of the hollow cylindrical tube while moving the inner peripheral surface of the hollow cylindrical tube. On the outer peripheral surface from the other opening of the cylindrical tube to half the length of the hollow cylindrical tube,
There is provided a method for thermal spraying the inner peripheral surface of a hollow cylindrical tube, characterized by injecting compressed air into a ring-shaped concave portion provided on a surface parallel to the opening end surfaces of the two opening portions.

Further, according to the present invention, the hollow cylindrical tube is erected, the rotation axis passing through the center of the opening end face of the two openings of the hollow cylindrical tube is defined, and the rotation axis is erected around the rotation axis. The hollow cylindrical tube is rotated in the circumferential direction of the opening end face, and a spraying gun for melting and spraying a sprayed material is inserted from an upper opening of the rotating hollow cylindrical tube. A method for thermal spraying an inner peripheral surface of a hollow cylindrical tube that forms a thermal spray coating by adhering and laminating the thermal spray material on the inner peripheral surface of the hollow cylindrical tube while moving the inner peripheral surface of the cylindrical tube. In the lower half of the outer peripheral surface of the hollow cylindrical tube from the lower opening of the hollow cylindrical tube, compressed air is supplied to a concave portion provided in a ring shape on a surface parallel to the opening end surface. Spraying method for inner peripheral surface of hollow cylindrical tube characterized by spraying Is provided.

Further, according to the present invention, the hollow cylindrical tube is erected, a rotation axis passing through the center of the open end face of the two openings of the hollow cylindrical tube is defined, and the rotation axis is erected around the rotation axis. The hollow cylindrical tube is rotated in the circumferential direction of the opening end face, and a spraying gun for melting and spraying a sprayed material is inserted from an upper opening of the rotating hollow cylindrical tube. A method for thermal spraying an inner peripheral surface of a hollow cylindrical tube that forms a thermal spray coating by adhering and laminating the thermal spray material on the inner peripheral surface of the hollow cylindrical tube while moving the inner peripheral surface of the cylindrical tube. In the lower half of the outer peripheral surface of the hollow cylindrical tube from the lower opening of the hollow cylindrical tube, compressed air is supplied to a concave portion provided in a ring shape on a surface parallel to the opening end surface. By injection, it rises along the inner peripheral surface of the hollow cylindrical tube There is provided a method for performing thermal spraying on the inner peripheral surface of a hollow cylindrical tube, which comprises generating an airflow and removing undissolved particles, fumes, or dust attached to the inner peripheral surface of the hollow cylindrical tube by the airflow.

In the present invention, when the injection distance of the compressed air is in the range of 10 to 100 mm from the outer peripheral surface of the hollow cylindrical tube,
The discharge pressure of the compressed air is preferably 1.0 to 8.0 Kg / cm ² , and the thermal spraying method is preferably plasma spraying. In addition, the thermal spraying method of the present invention uses sodium-
It can be suitably used for processing the inner peripheral surface of the anode container for a sulfur battery.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention relates to a thermal spraying method, more specifically, to a method of forming a thermal spray coating on an inner peripheral surface of a hollow cylindrical tube while rotating the same.

In the thermal spraying method used in the present invention, specifically, as shown in FIGS. 1 and 3, for example, an upright hollow cylindrical tube 1 is fixed by a fixing chuck 3 and the fixing chuck 3 is fixed. Is rotated in the circumferential direction of the opening end surfaces 22 and 23 by a driving device (not shown) connected to the inner surface of the hollow cylindrical tube 1 by inserting the spraying gun 6 into the hollow cylindrical tube 1 through the upper opening 20. While maintaining a constant spraying distance with the surface 4, a reciprocating motion is performed up and down, and the molten sprayed material 10 is sprayed toward the inner peripheral surface 4 of the hollow cylindrical tube 1 to form a sprayed coating 11 having a predetermined thickness. How to

The thermal spraying is a thermal spraying material made of metal or the like,
Combustion flame by flammable gas such as acetylene and oxygen gas,
Alternatively, it refers to a processing method in which a sprayed particle is formed by being melted by electric energy such as an arc to form a sprayed particle, and spraying the sprayed particle onto the surface of the base material to attach and laminate the sprayed particle. Depending on the type of energy used, gas spraying, explosive spraying, wire explosion spraying, flame spraying,
There are arc spraying and plasma spraying, and any of the above methods can be used. In the present invention, it is preferable to use plasma spraying capable of forming a high-density coating.

As the thermal spraying material in the above method, metal powders such as aluminum and molybdenum, alloy powders such as nickel-chromium, ceramic powders such as alumina and zirconia can be used. In the present invention, stellite having excellent corrosion resistance is used. It is preferable to use an alloy or a chromium-iron alloy having a chromium content of 60% or more, and a particle size of 10 to 45 μm can be suitably used.

The thermal spray coating refers to a film-like laminate formed by spraying the thermal spray material as thermal spray particles, and generally has a laminar cross-sectional structure having pores therein. In the above method, it is possible to form a sprayed coating having an average thickness of about 10 to 300 μm, but in the present invention, the average thickness is 40 to 100 μm.
The purpose is to form a thin layer of about μm.

In the above method, the spraying distance, that is, the distance between the spraying gun and the inner peripheral surface of the hollow cylindrical tube, is such that the spraying gun and the hollow cylindrical tube do not come into contact with each other and the inner peripheral surface of the hollow cylindrical tube has spray particles. Is not limited as long as the thermal sprayed coating can be formed, but the thickness used in the present invention is 1.5 to 3.0 m.
m, a hollow cylindrical tube having a diameter of about 70 to 95 mm preferably has a spraying distance of about 30 to 45 mm.
The atmosphere at the time of thermal spraying is not particularly limited, and the processing can be performed in the air or in an inert gas.

The hollow cylindrical tube used in the above method is a cylindrical tube having a hollow portion made of aluminum, an aluminum alloy, stainless steel, or the like, and has a tube length of 300 to 650.
mm, a wall thickness of 1.0 to 5.0 mm, and a pipe diameter of about 60 to 120 mm can be used.In the present invention, the material is aluminum or an aluminum alloy, and the pipe length is 400 to
It is preferable to use a pipe having a thickness of about 600 mm, a wall thickness of about 1.5 to 3.0 mm, and a pipe diameter of about 70 to 95 mm. In addition, in order to improve the adhesion effect of the thermal spray coating by increasing the anchor effect of the thermal spray particles,
It is preferable that the surface of the hollow cylindrical tube is roughened by blasting before thermal spraying.

In the above method, the hollow cylindrical tube 1
The center O of the open end faces 22, 23 of the two openings 20, 21;
A rotation axis XX 'passing through O' is defined, and the hollow cylindrical tube 1 is rotated around the rotation axis XX 'in the circumferential direction of the opening end faces 22, 23. By moving the spray gun 6 along the inner peripheral surface 4 of the rotating hollow cylindrical tube 1 in this manner, the spray distance between the inner peripheral surface 4 of the hollow cylindrical tube 1 and the spray gun 6 is kept constant. Therefore, a uniform thermal spray coating 11 can be formed. In addition, as long as the rotation method as described above can be used, it is not necessary to arrange the hollow cylindrical tube upright as shown in FIG.

In the thermal spraying method as described above, according to the present invention, two openings are provided on the outer peripheral surface from the opening of the hollow cylindrical tube not on the side where the spraying gun is inserted to half the length of the hollow cylindrical tube. The compressed air is injected into a concave portion provided in a ring shape on a surface parallel to an opening end surface of the portion.

[0021] By doing so, an airflow is generated which blows up toward the opening on the side where the spraying gun is inserted along the inner peripheral surface of the hollow cylindrical tube, so that a special device is disposed near the opening of the hollow cylindrical tube. It is possible to easily remove undissolved particles, fumes, or dust adhering to the surface of the thermal spray coating by the airflow without the need. Hereinafter, the method of the present invention will be specifically described with reference to the drawings.

As shown in FIG. 1, as the hollow cylindrical tube used in the present invention, the outer peripheral surface from the opening not on the side where the thermal spraying gun is inserted to half the length of the hollow cylindrical tube, FIG. In the example, the lower half of the outer peripheral surface 5 of the hollow cylindrical tube 1
The concave portion 2 provided in a ring shape on a surface 24 parallel to the opening end surfaces 22 and 23 of the two openings 20 and 21 is provided in any of the portions (lower outer peripheral surface) 25.

By injecting compressed air 13 into the concave portion 2 from an injection nozzle 12 disposed on the side of the hollow cylindrical tube 1 erected, the lower opening 2 of the hollow cylindrical tube 1 is formed.
An air flow 14 is generated which blows upward along the inner peripheral surface 4 from the inner peripheral surface 1, and undissolved particles, fumes or dust existing inside the hollow cylindrical tube 1 or adhering to the inner peripheral surface 4 of the hollow cylindrical tube 1 are generated by the air flow 14. It can be discharged to the outside of the hollow cylindrical tube 1.

Therefore, the openings 20, 2, 2
It is not necessary to arrange any special equipment in the vicinity of 1 and it is possible to remove undissolved particles, fumes or dust by a very simple operation of blowing compressed air 13 to the outer peripheral surface 5 of the hollow cylindrical tube 1. The surface can be cleaned and smoothed, and corrosion from the attached portion can be prevented.

At present, the cause of the air flow 14 is unknown, but it has been confirmed that the air flow 14 is always generated by the above operation, and the compressed air 13 blown to the recess 2 is rotated by the rotation of the hollow cylindrical tube 1. It is presumed that the airflow 14 that blows upward is generated by being caught in the hollow cylindrical tube 1.

Here, an anode container for a sodium-sulfur battery (hereinafter, referred to as an anode container) to which the present invention is preferably used will be outlined. Sodium-sulfur battery has 30
This is a high-temperature secondary battery operated at 0 to 350 ° C., for example, as shown in FIG. 4, a cylindrical anode mold 56 in which an anode conductive material 62 is mainly impregnated with sulfur.
Container, a cylindrical solid electrolyte tube 55 having a bottom made of β-alumina, and a sodium container 60 having an opening 67 at the bottom. FIG.
In the figure, 51 indicates an insulator ring, 54 indicates a sodium-sulfur battery, 57 indicates sodium, and 61 indicates a cathode fitting.

In the sodium-sulfur battery 54 having the above configuration, at the time of discharge, the molten sodium 57 emits electrons to become sodium ions, which pass through the solid electrolyte tube 5 having a function of selectively transmitting sodium ions. To the anode side, and reacts with the sulfur in the anode conductive material 62 and the electrons that have passed through the external circuit to generate sodium polysulfide and generate a voltage of about 2 V. , A reaction of forming sodium and sulfur from sodium polysulfide occurs. Therefore, in order to increase the charge / discharge efficiency of the sodium-sulfur battery, it is necessary to reduce the internal resistance of the battery. Specifically, the contact resistance between each member such as the anode container 53 and the anode conductive material 62 is required. Can be reduced.

Since the inner surface of the anode container is exposed to highly corrosive sodium sulfide, a sprayed coating is formed to impart corrosion resistance. However, FIG.
As shown in (2), when undissolved particles 64 and fumes 65 remain on the surface of the sprayed coating 63, the smoothness of the sprayed coating surface 66 is lost, and the adhesion between the anode container 53 and the anode conductive material 62 is reduced. Poor adhesion between the anode container 53 and the anode conductive material 62 is not preferable because it leads to an increase in the internal resistance of the battery.

By using the thermal spray processing method of the present invention to blow compressed air to the concave portion provided on the outer peripheral surface of the anode container, the thermal spray coating surface 66 becomes smooth as shown in FIG. Adhesion between the anode container 53 and the anode conductive material 62 can be ensured.

[0030]

Hereinafter, an example in which the present invention is applied to an anode container for a sodium-sulfur battery (hereinafter, referred to as an anode container) will be described, but the present invention is not limited to this example.

(Example 1) In the apparatus shown in FIG.
As the hollow cylindrical tube 1, an anode container made of an aluminum alloy and having a tube length of 460 mm, a pipe inner diameter of 84 mm, and a pipe thickness of 2.0 mm was used. The outer peripheral surface 5 of the anode container 1 has a width of 8 to 19 mm and a depth of 6 to 19 mm at a portion approximately 30 mm from the opening at the bottom of the figure in order to reduce mechanical stress on the solid electrolyte tube.
A 12 mm concave portion 2 is provided in a ring shape parallel to the two open end faces.

The anode container 1 is preheated to 200 ° C. in order to improve the adhesion with the sprayed material, and then fixed to a fixing chuck 3, and the anode container 1 is driven by a driving device (not shown) connected to the fixing chuck 3. While rotating the container 1 at 320 rpm, the injection nozzle 12 disposed at a distance of 50 mm from the outer peripheral surface 5 of the anode container 1 vertically 4.8
Thermal spraying was performed by blowing compressed air 13 at a discharge pressure of Kg / cm ² .

As the thermal spraying material 9, a chromium-iron alloy having a high chromium content of 72% having high corrosion resistance is used, the plasma output is 9.5 KW, and the traverse speed of the thermal spray gun 6 is 15 mm / se.
c. The spraying gun 6 is reciprocated along the inner peripheral surface 4 of the anode container 1 once while maintaining the spraying distance at 35 mm.
A sprayed coating 11 of ~ 80 µm was formed.

For the examples and comparative examples, see JIS-B-06
The evaluation was performed according to the stylus type surface roughness measurement specified in 51. In detail, for each of the three sprayed surfaces of the four anode containers that were processed, the center line average roughness was measured using a surf test 301 surface roughness tester manufactured by Mitutoyo Corporation.
(Ra) was measured. The measurement was performed in the longitudinal direction of the pipe, and the measurement distance was 12.5 mm. Table 1 shows the results. Further, each anode container was incorporated in a sodium-sulfur battery, and Example 1 and Comparative Example 1 were operated at 372 ° C.
In Example 2 and Comparative Example 2, changes in the internal resistance and the battery capacity when the charge / discharge cycle at 360 ° C. was repeated 600 times were tracked. The evaluation results are shown in FIGS.

(Comparative Example 1) Under the same conditions as in Example 1, a thermal spraying process was performed without only blowing the compressed air 13. The evaluation results are shown in Table 1, FIG. 6 and FIG.

[0036]

[Table 1]

(Embodiment 2) In the apparatus shown in FIG.
Tube length 500 made of aluminum alloy as hollow cylindrical tube
The anode container 71 having an inner diameter of 92 mm, a pipe inner diameter of 92 mm and a pipe thickness of 3.0 mm was used. The outer peripheral surface 75 of the anode container 71 has a width of 10 m at a portion 30 mm from the opening 91 at the bottom of the figure.
m, a concave portion 72 having a depth of 10 mm has two open end faces 90, 93.
It is provided in a ring shape in parallel with.

After the anode container 71 is preheated to 230 ° C. in order to improve the adhesion with the sprayed material, the fixing chuck 7
The anode container 71 is fixed at 380 rpm by a driving device (not shown) connected to the fixing chuck 73.
8A, the anode container 7 is rotated as shown in FIG.
1 A spray nozzle 82 was disposed at a distance of 65 mm from the outer peripheral surface 75, and the concave portion 72 was sprayed vertically with compressed air 83 at a discharge pressure of 5.0 kg / cm ² to perform thermal spraying.

As in Example 1, a chromium-iron alloy having a chromium content of 72% was used as the thermal spray material 79, the output of the plasma 77 was 9.3 KW, the traverse speed of the thermal spray gun 76 was 12 mm / sec. Example 1 with a distance of 40 mm
In the same manner as above, a thermal spray coating 81 of about 40 to 80 mm was formed on the inner peripheral surface 74. The evaluation results are shown in Table 2, FIG. 6 and FIG.

COMPARATIVE EXAMPLE 2 Under the same conditions as in Example 2, as shown in FIG.
Instead, spraying was performed while spraying the flat plate portion 85 at the center of the tube. The evaluation results are shown in Table 2, FIG. 6 and FIG.
Shown in In FIGS. 8A and 8B, reference numeral 78 denotes a spray material spray nozzle, and reference numeral 80 denotes spray particles.

[0041]

[Table 2]

As shown in Table 1, the surface roughness of the anode vessel of Example 1 was 4.7 μm on average and was distributed in the range of 3.9 to 5.8 μm, whereas the average of surface roughness was comparative example 1 7.
It is distributed in the range of 5 μm and 6.9 to 8.2 μm, and the surface roughness is clearly lower when the processing method of the present invention is used, and a superior difference is recognized. Example 2 is also the same as Example 1 with respect to the surface roughness.
The same tendency is shown. However, as in Comparative Example 2, even when the same outer peripheral surface of the anode container is used, when the compressed air is injected to the flat plate portion at the center of the tube, the effect of the present invention is not obtained, and the compressed air is not injected. Only the same results as in Comparative Example 1 can be obtained.

When the anode containers of Examples 1 and 2 and Comparative Examples 1 and 2 were incorporated in a sodium-sulfur battery and the charge / discharge cycle was repeated 600 times at an operating temperature of 372 ° C., the anode containers of Examples 1 and 2 were Although the container showed almost no increase in internal resistance from about 4.8 mΩ, Comparative Example 1
Anode container 2 gradually rises from about 4.8 mΩ to about 6.0 mΩ.
mΩ.

Further, the anode containers of Example 1 and Comparative Example 1 were incorporated in a sodium-sulfur battery, and the operating temperature was adjusted to 360 °.
When the charge / discharge cycle was repeated 600 times at ℃, the anode container of Example 1 was about 93%, although the battery capacity was reduced, whereas the anode container of Comparative Example 1 was about 150 times. The battery capacity decreased remarkably after passing through the charge / discharge cycles, and dropped to 81% at the end of 600 charge / discharge cycles.

[0045]

As described above, according to the present invention, it is possible to remove undissolved particles, fumes, or dust adhering to the surface of a thermal sprayed coating during thermal spraying without providing special equipment. The surface of the thermal spray coating can be cleaned and smoothed, and corrosion from the adhered portion can be prevented. In addition, the processing method of the present invention can be preferably used for thermal spraying of the inner peripheral surface of the anode container for a sodium-sulfur battery, and the anode container according to the processing method suppresses an increase in internal resistance and a reduction in battery capacity. Is done.

[Brief description of the drawings]

FIG. 1 is a partially cutaway front view showing one embodiment of the present invention.

FIG. 2 is a partially cutaway front view showing an example of the prior art.

FIG. 3 is a schematic perspective view for explaining one embodiment of the present invention.

FIG. 4 is a front sectional view showing an example of a sodium-sulfur battery.

FIGS. 5A and 5B are schematic front sectional views (a) and (b) of a sodium-sulfur battery showing a conventional thermal spray coating surface and a thermal spray coating surface of the present invention, respectively.

FIG. 6 is a graph showing a change in an internal resistance value according to a charge / discharge cycle of a sodium-sulfur battery.

FIG. 7 is a graph showing a change in battery capacity according to a charge / discharge cycle of a sodium-sulfur battery.

FIGS. 8A and 8B are schematic front views (a) and (b) showing the injection positions of compressed air in Example 2 and Comparative Example 2 of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Hollow cylindrical tube (anode container), 2 ... concave part, 3 ... fixing chuck, 4 ... inner peripheral surface, 5 ... outer peripheral surface, 6 ... spraying gun, 7
... Plasma jet, 8 ... Injection nozzle (for thermal spray material),
9: Thermal spray material, 10: Thermal spray particles, 11: Thermal spray coating, 12
... Injection nozzle (for compressed air), 13 ... Compressed air, 14 ...
Air flow, 20: upper opening, 21: lower opening, 22: upper opening end surface, 23: lower opening end surface, 24: surface parallel to the opening end surface, 25: lower outer peripheral surface, 31: hollow cylindrical tube, 33 ...
Fixing means, 34: inner peripheral surface, 35: outer peripheral surface, 36: thermal spray gun, 37: energy, 38: spray nozzle (for thermal spray material), 39: thermal spray material, 40: thermal spray particles, 41: thermal spray coating, 51 ... Insulator ring, 53 ... Anode container, 54 ... Sodium-sulfur battery, 55 ... Solid electrolyte tube, 56 ... Anode mold, 57 ... Sodium, 60 ... Sodium storage container, 61 ... Cathode fitting, 62 ... Anode conductive material, 63 ... sprayed coating, 64 ... undissolved particles, 65 ... fume, 66 ... sprayed coating surface, 71 ... anode container, 72 ... recess, 73 ... fixing chuck, 74 ... inner peripheral surface, 75 ... outer peripheral surface, 76 ... thermal spraying Gun, 77: Plasma jet, 78: Spray nozzle (for spray material), 79: Spray material, 80: Spray particles, 81: Spray coating, 82: Spray nozzle (for compressed air), 83: Compressed air, 85: Tube Center Plate portion, 90 ... upper open end, 91
... lower opening, 93 ... lower opening end face.

Claims (6)

[Claims] 1. A rotation axis passing through the centers of the open end faces of two openings of a hollow cylindrical pipe is defined, and the hollow cylindrical pipe is rotated around the rotary axis in a circumferential direction of the open end face to rotate. From one opening of the hollow cylindrical tube, insert a spray gun for melting and spraying the sprayed material, and move the spray gun along the inner peripheral surface of the hollow cylindrical tube, The sprayed material is attached to the inner peripheral surface of the cylindrical tube.
A method for thermal spraying an inner peripheral surface of a hollow cylindrical tube that forms a thermal spray coating by laminating, the outer peripheral surface extending from the other opening of the hollow cylindrical tube to half the length of the hollow cylindrical tube. 2. A method for thermal spraying an inner peripheral surface of a hollow cylindrical tube, wherein compressed air is jetted to a concave portion provided in a ring shape on a surface parallel to the opening end surfaces of the two opening portions. 2. A hollow cylindrical tube is erected, a rotation axis passing through the center of an open end face of two openings of the hollow cylindrical tube is defined, and the hollow cylindrical tube erected around the rotation axis is opened. A spray gun for melting and spraying a spray material is inserted from the upper opening of the rotating hollow cylindrical tube rotating in the circumferential direction of the end face, and the spray gun is moved to the inner peripheral surface of the hollow cylindrical tube. While moving along
A method for thermal spraying an inner peripheral surface of a hollow cylindrical tube that forms a thermal spray coating by adhering and laminating the thermal spray material on an inner peripheral surface of the hollow cylindrical tube. Injection of compressed air to a concave portion provided in a ring shape on a surface parallel to the opening end surface in a lower half portion of the outer peripheral surface of the tube to the inner peripheral surface of the hollow cylindrical tube. Thermal spray processing method. 3. A hollow cylindrical tube is erected, a rotation axis passing through the centers of the open end faces of two openings of the hollow cylindrical tube is defined, and the hollow cylindrical tube erected around the rotation axis is opened. A spray gun for melting and spraying a spray material is inserted from the upper opening of the rotating hollow cylindrical tube rotating in the circumferential direction of the end face, and the spray gun is moved to the inner peripheral surface of the hollow cylindrical tube. While moving along
A method for performing thermal spraying on an inner peripheral surface of a hollow cylindrical tube that forms a thermal spray coating by attaching and laminating the thermal spray material on an inner peripheral surface of the hollow cylindrical tube. By injecting compressed air to a concave portion provided in a ring shape on a surface parallel to the opening end surface in a lower half portion of the outer peripheral surface of the pipe, the inner peripheral surface of the hollow cylindrical pipe extends along the inner peripheral surface. A method of performing a thermal spraying process on the inner peripheral surface of the hollow cylindrical tube, wherein an undissolved particle, fume, or dust attached to the inner peripheral surface of the hollow cylindrical tube is removed by the air flow. 4. The discharge pressure of the compressed air is 1.0 to 8.0 Kg / cm ^{2 when} the injection distance of the compressed air is in a range of 10 to 100 mm from the outer peripheral surface of the hollow cylindrical tube. The thermal spraying method described in the paragraph. 5. The method according to claim 1, wherein the thermal spraying method is plasma spraying.
The thermal spraying method according to any one of items 1 to 4. 6. The thermal spraying method according to claim 1, wherein the hollow cylindrical tube is an anode container for a sodium-sulfur battery.