JP2554815B2 - Welding ceramic piece and its construction method - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ceramic piece for welding which can be easily attached to the surface of a metal base material by arc stud welding, and a method for constructing the same.

[0002]

2. Description of the Related Art By providing a heat resistant protective layer of ceramics on a metal base material, a structural material used in a high temperature atmosphere such as a furnace wall, a burner, and tuyere is obtained. Alternatively, it is used as a lining for high-speed rotating equipment such as blowers and pumps by utilizing the wear resistance of ceramics. ◎ Recently, as a method for easily forming this ceramic layer on site, there has been proposed a method of attaching ceramics formed into a piece of a certain shape by means such as welding or brazing.

For example, in Japanese Utility Model Laid-Open No. 63-111278, as shown in FIG. 5, a flange portion C following a cone portion B is provided as a welding ceramic piece A, and a pin D is integrally formed on the flange portion C. A structure is proposed in which the pin portion D of the stud molded or metal-bonded to is inserted into the hole provided in the ceramic piece body.

In this structure, however, the cross-sectional area reduction portion provided on the pin is exposed on the surface of the ceramic piece. Therefore, for example, when the lining of a molten aluminum container is used, the pin is melted and the hole portion of the ceramic piece is damaged. The aluminum penetrated from there and the cone portion was melted and damaged, causing the ceramic piece to peel off from the base material.

Aluminum may enter from the bottom of the ceramic piece. However, with the conventional ceramic piece, it is impossible for the base metal and the ceramic piece to completely adhere to each other during welding, and when the aluminum that has entered from the joint material reaches the base metal, the aluminum will enter through the gap between the ceramic piece and the base material. It entered into the concave portion of the ceramic piece and melted and damaged the flange portion, causing the peeling of the ceramic piece. Further, when the pin and the ceramic piece are in close contact with each other, when the pin and the ceramic piece are brazed, the braze does not penetrate into the gap between the pin and the ceramic piece, and the pin and the ceramic piece cannot be brazed.

[0006]

DISCLOSURE OF THE INVENTION According to the present invention, the reduced cross-sectional area of the pin that is broken off after welding is exposed on the surface of the ceramic piece, and when the pin is used as an inner lining of a molten aluminum container, the pin is melted and damaged. This is to solve the phenomenon that aluminum penetrates through the holes of the ceramic piece, the cone portion is melted and the ceramic piece is separated from the base material. Alternatively, when the aluminum that has entered through the joint gap reaches the base metal, the aluminum reaches the metal plate of the ceramic piece through the gap between the ceramic piece and the base metal and melts the metal plate, causing the ceramic piece to become the base metal. The present invention provides a ceramic piece that solves the phenomenon of delamination and a method of constructing the same.

[0007]

In the ceramic piece for welding according to the present invention, the cross-sectional area reduction portion provided on the pin is provided inside the surface of the ceramic piece in order to facilitate the separation of the unnecessary pin after welding. Especially. That is, the gist of the present invention is to provide a welding ceramic in which a flange portion following a metal cone portion is provided, and a pin portion of a stud integrally formed or metal-bonded to the flange portion is inserted into a hole provided in the ceramic piece body. In the piece, the constricted part of the pin is provided inside the upper end surface of the ceramic piece, and a gap is provided between the pin and the ceramic piece.

Further, the present invention provides a ceramic piece for welding in which a flange portion following the metal cone portion is provided, and a pin portion of a stud integrally formed or metal-bonded to the flange portion is inserted into a hole provided in the ceramic piece body. In, the pin constriction is provided inside the upper end surface of the ceramic piece, and the ceramic piece for welding with a gap between the pin and the ceramic piece is brought into contact with the base material and the pin is energized to stud the cone and base material. After welding, the metal pin portion is separated from the constricted portion, and the tip end portion is filled with a refractory material for a welding ceramic piece.

Then, a sealing material is attached to the bottom of the ceramic piece, the aluminum that has entered from the joint material reaches the base material, and the aluminum enters the concave portion of the ceramic piece through the gap between the ceramic piece and the base material, and the flange portion is Prevent melting.

Further, a wear-resistant material and a heat-resistant material are filled in the voids after the unnecessary portions of the pins are broken off, the metal portions are covered and aluminum, acid or the like penetrates, and the cone portion is melted or corroded. The purpose is to prevent the ceramic piece from peeling from the base material.

Brick, caster, ceramics or the like can be selected as the type of refractory material according to the specification conditions. A clay-like putty material of the same material as the ceramic piece or a fired compact is preferable.

[0012]

In order to achieve the object of the ceramic piece for welding of the present invention, the constricted portion provided on the pin is provided inside the surface of the ceramic piece in order to facilitate the separation of the unnecessary pin after welding. As a result, the space after the unnecessary part of the pin is broken off is filled with wear-resistant material and heat-resistant material to cover the metal part, the aluminum acid permeates and the cone part is melted, and the ceramic piece becomes the base material. Can be prevented from peeling off. Also, a sealing material is attached to the bottom of the ceramic piece to prevent aluminum that has entered from the joint material, for example, reaching the base material, and aluminum from entering the concave portion of the ceramic piece through the gap between the ceramic piece and the base material. Can be prevented from melting.

Also, since the constricted part of the pin is inside the surface of the ceramic piece, when brazing, the braze penetrates to the constricted part of the pin, but since the constricted part becomes wide, the penetration of the wax is Stop at the part. Therefore,
Since the pin is not joined to the ceramic piece, it can be easily separated by twisting. Moreover, some of the pins remaining on the ceramic piece are firmly joined to the ceramic piece, and the joining can be maintained even if the flange portion peels off.

[0014]

EXAMPLE FIG. 1 is a cross-sectional view showing a ceramic piece of this example. The ceramic piece 1 has, for example, a thickness of 3 to 5
It can be obtained by molding a 0 mm plate material into an appropriate shape such as a square or a rectangle. Alternatively, it can be obtained by directly sintering and molding the ceramic powder into a desired shape. By attaching a plurality of such ceramic pieces 1 to the target base metal, heat resistance, wear resistance and the like can be improved.

As the material used for the ceramic piece 1, there are various materials such as alumina, zirconia, silicon carbide and silicon nitride. A small-diameter hole 2 is provided in the center of the ceramic piece 1, and this hole 2 is connected to a circular recess 3 provided in the lower portion of the ceramic piece 1. In this way, the metallic stud pin 4 is inserted into the cavity provided in the ceramic piece 1.

The hole 2 drilled in the ceramic piece 1 is provided with a gap 6 between it and the stud pin 4, and the metal cone 9 having a convex portion and the stud pin 4 are integrally or integrally fixed. It is set up.

Furthermore, the metal cone portion 9 and the ceramic piece 1
Are joined by the brazing part 10. The stud pin 4 is provided with a constricted portion 8 at a position inside the hole 2 of the ceramic piece 1.

FIG. 2 is a cross-sectional view showing an example of construction of the ceramic piece 1 of the present invention, in which the hole 2 after pin separation is filled with a putty 5 of refractory material. FIG. 3 is a cross-sectional view of another example of construction of the ceramic piece of the present invention in which the hole 2 after pin separation is filled with the molded body 6 of the refractory. FIG. 4 is a cross-sectional view of the ceramic piece of this embodiment provided with the sealing material 7 at the bottom.

As the material used for the ceramic piece 1, there are various materials such as alumina, zirconia, silicon carbide and silicon nitride. A small-diameter hole is provided in the center of the ceramic piece, and the hole is connected to a circular recess 3 provided in the lower portion of the ceramic piece 1. A stud is attached to the cavity provided in the ceramic piece 1. The shape of the stud is such that a flange portion 9a following the cone portion 9 is provided, and the pin portion of the stud in which the stud pin 4 is integrally molded or metal-bonded to the flange portion 9a is provided in the ceramic piece body. Have been inserted into.

In order to separate the unnecessary portion of the pin after welding, the constricted portion 8 provided on the pin is provided inside the surface of the ceramic piece 1. The method of attaching the stud pin 4 to the ceramic piece 1 is as follows.
There are a method of metallizing with -Cu-Ti and joining with Cu-Mn-Ni interposed, and a method of joining with Ni-Cr-Si interposed. A flexible heat insulating material is suitable for the sealing material attached to the bottom of the ceramic piece. For example, there is a cloth woven from Tyranno fiber.

After the ceramic piece 1 for welding is joined to the base material 20, the pin is cut from the cross-sectional area reduction portion provided in the stud pin 4 and the hole 2 is buried. For example, putty material such as SUMICERAM. There is a heat resistant adhesive.
As the molded body, there is an embedded object in which a ceramic piece of the same material as the ceramic piece is molded according to the size of the hole. The following setting ranges are possible as conditions for joining the ceramic pieces. Current value 1000 to 20000 A, preferably 400
0-6000A voltage 100-300V, preferably 150-18
0 V energization time 0.5 seconds The ceramic pieces prepared as described above were joined under the following conditions and the shear strength was measured. The brazed portion between the ceramic and the stud pin and the joined portion between the ceramic piece and the base material were It was not damaged, the ceramic part was damaged, and sufficient strength could be confirmed. Current value 5000A Voltage 170V Energization time 0.5 seconds

[0022]

By employing the ceramic piece and the joining method thereof according to the present invention, it becomes possible to easily and firmly attach the ceramic piece on site. It is possible to easily repair the partial peeling of the ceramic piece. Therefore, it is possible to improve the wear resistance of the structure and protect the base material from corrosive gas and liquid.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a ceramic piece of this example.

FIG. 2 is a cross-sectional view of a ceramic piece according to an embodiment of the present invention in which holes are filled with refractory putty after the pins are separated.

FIG. 3 is a cross-sectional view of another example of construction of the ceramic piece of the present invention in which a hole after pin separation is filled with a molded product of a refractory material.

FIG. 4 is a cross-sectional view when a sealing material is provided on the bottom of the ceramic piece of the present embodiment.

FIG. 5 is a cross-sectional view of a known example.

Claims (2)

(57) [Claims] 1. A flange portion following the metal cone portion is provided,
And the pin portion of the stud integrally molded or metal-bonded to the flange portion, in the welding ceramic piece inserted into the hole provided in the ceramic piece body, the constricted portion of the pin is provided inside the upper end surface of the ceramic piece, A ceramic piece for welding, characterized in that a gap is provided between the pin and the ceramic piece. 2. A flange portion following the metal cone portion is provided,
And the pin portion of the stud integrally molded or metal-bonded to the flange portion, in the welding ceramic piece inserted into the hole provided in the ceramic piece body, the constricted portion of the pin is provided inside the upper end surface of the ceramic piece, In addition, a ceramic piece for welding with a gap between the pin and the ceramic piece is brought into contact with the base material to energize the pin portion, stud welding is performed between the cone portion and the base material, and then the metal pin portion is separated from the constricted portion. A method for constructing a ceramic piece for welding, characterized in that a refractory material is filled in.