JPH0727484A - Ceramic material melting container and its manufacture - Google Patents

Abstract

PURPOSE:To obtain a ceramic material melting container where ceramic material can be melted without polluting the ceramic material and the diameter of a bottom hole through which molten ceramic material is discharged can be adjusted. CONSTITUTION:A container main body 2 has an opening 6 with a specified diameter in the bottom and an inner wall 2a that can be cooled. A stopper 14 made of the same material as the ceramic material to be melted is put in the opening 6 of the container main body 2 to plug the opening 6.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ceramic material melting container (hereinafter referred to as "melting container") capable of melting a ceramic material without contaminating it and a method for producing the same.

[0002]

BACKGROUND OF THE INVENTION Ceramic materials (materials used in cement, ceramics, refractories, etc., such as minerals such as silicates, carbonates, and sulfides) are used as a container for the dissolution of the materials. Conventionally, a melting vessel using a refractory material such as alumina, zirconia, or graphite has been used. Even in a container using such a refractory, since the melting temperature of the ceramic material becomes high, it is unavoidable that the material forming the container melts into the molten ceramic material and contaminates the ceramic material.

Further, in the conventional melting container, the diameter of the bottom hole through which the melted ceramic material flows out cannot be adjusted, and it cannot be stably used for the gas atomizing method or the like. There were challenges. It is an object of the present invention to provide a melting container and a method for manufacturing the same that can solve the above problems.

[0004]

In order to achieve the above object, the present invention provides a container main body having an opening portion having a predetermined diameter formed in a bottom portion and an inner surface portion of which can be cooled, and the container main body described above. The melting container is composed of a lid body made of the same material as the material to be melted, which closes the opening.

The mounting (formation) of the lid body on the container body is performed by a method of fitting and fixing a lid body made of the same material as the material to be melted to close the opening portion. The opening is closed from below by a shielding member having a substantially flat upper surface, and then a small amount of the ceramic material to be melted is melted inside the container body to be defined by the shielding member and the opening. A method may be used in which the shielding member is removed after flowing into the concave space to be solidified.

[0006]

Embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a schematic view showing a dissolving container according to an embodiment of the present invention, in which reference numeral 2 is a container body. The container body 2 is a substantially bottomed cylindrical container having a substantially cup-shaped recess 4 formed in the inner diameter thereof, and is made of copper. A tapered opening 6 is formed at the center of the bottom so that the diameter gradually decreases downward. A hollow portion 8 is formed inside the container body 2 and communicates with the inner diameter portions of the pipes 10 and 12 provided on the side of the container body 2. These pipes 10 and 12 are connected to a cooling water supply device (not shown), and the cooling water sent from the pipe 10 is collected from the pipe 12 after cooling the inner surface portion 2a of the container body 2. ing.

On the other hand, a lid 14 having a tapered outer peripheral surface 16 is attached and fixed to the opening 6 of the container body 2 so as to close the opening 6. This lid 14
Is made of the same material as the ceramic material that is melted by the main melting container.

The melting container according to the present embodiment comprises the above-mentioned container body 2 and the lid body 14. The method of mounting (forming) the lid body 14 on the container body 2 is as follows. The lid 14 manufactured by another melting furnace or the like may be fitted and fixed to the opening 6 from the inside of the container main body 2 to close the opening 6. Further, as another method, a method as shown in FIG. 2 described below may be used.

In the method shown in FIG. 2, first, the opening 6 of the container body 2 is closed from below by a shielding member 18 having a flat upper surface, and then a small amount of the metal M to be dissolved is contained in the container body 2. Put it inside. As the shielding member 18, a member made of copper and capable of cooling the surface portion by passing cooling water through the inside thereof like the container body 2 (a cooling structure is not shown) is used.

Next, while the container body 2 and the shield member 18 are being cooled, a voltage is applied between the container body 2 and the metal M to be melted to dissolve the metal to be melted and the shield member is formed. It flows into a concave space 20 defined by 18 and the opening 6 and is solidified in the concave space 20. After that,
If the shielding member 18 is removed from the container body 2, the opening 6
Then, the lid 14 similar to that shown in FIG. 1 is mounted (formed).

When the ceramic material is melted in the melting container described above, the ceramic material is put into the container, and while cooling the container body 2, the ceramic material is melted by irradiation of plasma arc or the like.

At this time, the inner surface 2a of the container body 2 is
The melted ceramic material is cooled and solidified in the inner surface portion 2a to form a solidified layer that thinly covers the entire inner surface portion 2a. This solidified layer is stably maintained as long as the cooling of the container body 2 is maintained, and since the solidified layer is made of the same material as the ceramic material to be melted, the metal constituting the container body 2 is It does not melt and flow into the molten ceramic material to contaminate the molten ceramic material.

A lid 14 attached to the container body 2
Also, since it is cooled by the container body 2, it hardly dissolves. Further, since the lid 14 is made of the same material as the ceramic material to be melted, even if a part of the lid 14 is melted, the melted ceramic material is not contaminated.

Next, a case (experimental example) in which the gas atomizing method is performed using the above-mentioned melting container will be described with reference to FIG. Note that FIG. 3 and FIGS.
In FIG. 3, the structure for cooling the inside of the furnace main body 2 is not shown. In FIG. 3, a plasma torch 22 is provided above the container body 2, and a gas ejection device 26 is provided below the container body 2. Container body 2
The inner diameter (the inner diameter of the minimum portion) of the opening 6 is 60 mm.

A shielding member 18 was installed in the lower portion of the container body 2, and a concave space defined by the shielding member 18 and the opening 6 was filled with about 1 cm square of melted material M of calcined SiC. Then, output 100k from Polazuma Torch 22
Irradiated with He plasma arc 24 of W to melt material M
Was dissolved to prepare a lid 14 (which may be in the shape of a nozzle).

Then, about 3 cm square of the calcined melted material M having the same composition as that of the melted material M was loaded into the container body 2. Subsequently, the material M to be melted and the central portion of the lid 14 were melted by irradiation of the plasma arc 24, the shielding member 18 was pulled out, and the melt flow 32 was dropped below the container body 32. At this time, the cooling rate of the container body 2 and the output of the plasma arc 24 were adjusted so that the diameter of the melt flow was constant. A pressure of 10.0 kg / c is applied to the melt flow 32 from the nozzle 26a of the gas ejection device 26.
A high-speed Ar gas jet 28 ejected at m ² and a flow rate of 4.2 Nm ³ / min was sprayed, the melt flow was rapidly cooled and pulverized to obtain a spherical powder 30.

As a comparative example, a graphite nozzle 34 is provided in the opening 6 of the container body 2 as shown in FIG. 4, and a powder having the same composition as that of FIG. 3 is manufactured in the same manner as in FIG. . In both the cases of FIG. 3 and FIG. 4, the diameter of the melt flow was 4 mm, and the characteristics of the obtained powder were as shown in Table 1 below.

[Table 1] As shown in Table 1, when the nozzle portion is made of a material different from the material to be melted, the particle size and shape of the powder are almost the same, but the amount of impurities (carbon in this case) mixed from the nozzle portion is small. You can see that it will increase. In addition, SiC is
It usually contains 30.0 wt% carbon.

As is clear from the above description, according to the melting container and the method for manufacturing the melting container, the melting container is melted at any time of melting the ceramic material and dropping the melted ceramic material downward. It is possible to prevent dissolution of the container on the inner surface of the container, to prevent contamination of the ceramic material, and to easily adjust the diameter of the bottom hole through which the dissolved ceramic material flows out downward, and to stabilize gas atomization. It can be used for the purposes such as law.

Further, the melting container according to the present invention can be used in various applications as shown in FIGS. 5 to 7 in addition to the above gas atomizing method to obtain the above effects. 5 is a centrifugal atomization method in which the cooling gas is blown from the cooling nozzle 38 while the melt stream 32 is dropped onto the rotating disk 36 to obtain fine particles 42, and the melt stream 32 is dropped onto the outer peripheral portion of the rotating roll 44 in FIG. A melt spinning method for obtaining a thin solid ribbon 46 is shown in FIG. 7, which is a die casting in which the melt stream 32 is injected into a rotary mold arranged in a heater 48 to produce a cast material 52.

[0020]

As described above, according to the present invention, at any time of melting the ceramic material and dropping the melted ceramic material downward, the melting of the container on the inner surface of the melting container is prevented. Dissolution can be prevented, the ceramic material is not contaminated, the diameter of the bottom hole through which the dissolved ceramic material flows out can be easily adjusted, and it can be stably used for the gas atomizing method etc. There is an effect that can be.

[Brief description of drawings]

FIG. 1 is a schematic view showing a dissolving container according to an embodiment of the present invention.

FIG. 2 is a schematic view showing one manufacturing method of the melting container.

FIG. 3 is a view showing one usage state of the melting container shown in FIG.

FIG. 4 is a diagram showing a state in which a composition of a lid (nozzle) of a melting container is changed.

5 is a diagram showing another usage state of the melting container shown in FIG. 1. FIG.

FIG. 6 is a view showing another usage state of the melting container shown in FIG.

FIG. 7 is a view showing another usage state of the melting container shown in FIG.

[Explanation of symbols]

 2 Container Main Body 2a Inner Surface (Container Main Body) 6 Opening 14 Lid 18 Shielding Member

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Toru Kono 1-297 Kitabukurocho, Omiya City, Saitama Prefecture Central Research Laboratory, Mitsubishi Materials Corporation

Claims (3)

[Claims] 1. A container body having an opening of a predetermined diameter formed in the bottom and an inner surface of which is formed to be coolable, and a material which is the same as the ceramic material to be melted and which closes the opening of the container body. A container for melting a ceramic material, comprising: 2. A lid body made of the same material as the ceramic material to be melted is fitted and fixed to the opening of the container body having an opening of a predetermined diameter formed on the bottom and an inner surface of which can be cooled. A method for manufacturing a ceramic material melting container, characterized in that the opening is closed. 3. An opening of a container main body having an opening of a predetermined diameter formed on the bottom and an inner surface of which is formed to be coolable, is closed from below by a shielding member having an approximately flat upper surface, Thereafter, a small amount of the ceramic material to be melted is melted inside the container body, and is poured into a concave space defined by the shielding member and the opening to be solidified,
After that, the shielding member is removed, and a method for manufacturing a ceramics material melting container.