KR20190011996A - The Cold Crucible Structure - Google Patents

Abstract

According to an embodiment of the present invention, provided is a cold crucible structure, comprising: a cold crucible unit including a hollow upper cap and a hollow lower cap; a plurality of segments in which the upper cap and the lower cap are connected to each other; a slit unit disposed between the segments; and a reaction area surrounded by segments; and induction coil unit disposed to cover an outer diameter of the cold crucible unit, and disposed to cross the longitudinal direction of the segments and the longitudinal direction of the slit unit. A diameter of the reaction area is defined as a diameter of a crucible, and the diameter of the crucible is 100 to 300 mm.

Description

The cold crucible structure < RTI ID = 0.0 >

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cold crucible structure, and more particularly, to a cold crucible structure having mechanical, structural, and thermal stability and improved dissolution efficiency.

High-melting-point active metals such as titanium are widely applied to the fields of fine chemicals, aerospace, automobile industry, defense industry, and medical equipment, which are the basis of the national industry.

A crucible is used to melt such high melting point active metals. In general, an indirect heating method is used in which a crucible is heated by induction heating using a crucible having a melting temperature much higher than that of a substance to be melted in order to melt a substance, as well as a high melting point active metal. This method uses a crucible whose melting point is much higher than that of the material to be melted, so that the crucible and the hot melt chemically react with each other to generate impurities in the melt and weaken the crucible. Further, in order to dissolve the high melting point active metal such as titanium, the aforementioned disadvantages can be further exacerbated.

Therefore, a cold crucible melting method for efficiently melting a high melting point active metal such as titanium can be used.

The Cold Crucible Melting Method can induce the material itself to be melted and the material itself to be melted can serve as the inner wall of the crucible. The cold crucible melting method is also referred to as direct heating since the material to be melted is directly heated by induction. In the cold crucible melting method, a container made of a tube made of a double tube is used, and a material having a high melting point to be melted is filled in a container, and then the cooling water is circulated while induction heating the material. In this induction heating method, since the outer wall of the melt is cooled during the progress of melting, a sintered layer formed of a melt and a powder is formed between the cold crucible made of a melt and a tube, and serves as a container. Such a cold crucible melting method is one of the methods used for crystal growth of high purity because it can maintain the purity of the material to be melted. Also, it can be said that it is very efficient to melt a high melting point active metal such as titanium.

However, the cold crucible used in the above-described cold crucible melting method has become a factor to lower the magnetic permeability, energy efficiency and dissolution efficiency due to the design considering only mechanical / thermal stability.

Therefore, it is necessary to standardize the design factors to improve magnetic permeability, dissolution efficiency and energy efficiency while making mechanical / thermal stability of cold crucible.

SUMMARY OF THE INVENTION The present invention is directed to a cold crucible structure capable of improving mechanical penetration efficiency, dissolution efficiency and energy efficiency, as well as mechanical / thermal stability by optimizing the thickness of a segment, the diameter of a coolant, .

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory and are not intended to limit the invention to the precise form disclosed. There will be.

According to an aspect of the present invention, there is provided a cold crucible structure including a hollow upper cap and a lower cap, a plurality of segments connecting the upper cap and the lower cap, And a cold crucible portion including a reaction region surrounded by the segment and an outer diameter of the cold crucible portion, the induction coil portion being disposed to cross the longitudinal direction of the segment and the longitudinal direction of the slit portion; Wherein the diameter of the reaction region is defined as a crucible diameter and the crucible diameter is 100 to 300 mm, and the interval of the slit portions is arranged by the following formula (1).

[Equation 1]

(mm)

(mm)

은 슬릿부의 간격이고, Ø는 도가니의 직경이다.

Is the distance between the slit portions, and? Is the diameter of the crucible.

The spacing of the slit portions may be in the range of 0.3 to 4 mm.

The cold crucible portion includes a cooling channel disposed inside the segment, and the diameter of the cooling channel may be in a range of 8 to 15 mm.

And a cooling tube which is connected to the lower cap and supplies and discharges cooling water that passes through the support and cools the segment. The cooling tube may be connected to the cooling channel.

The cooling passage may include an inlet passage through which cooling water is supplied and a discharge passage through which cooling water is discharged.

The thickness of the segments may be in the range of 15 to 25 mm.

According to another aspect of the present invention, there is provided a cold crucible structure including a hollow upper cap and a lower cap, a plurality of segments connecting the upper cap and the lower cap, And a cold crucible portion including a reaction region surrounded by the segment and an outer diameter of the cold crucible portion, the induction coil portion being disposed to cross the longitudinal direction of the segment and the longitudinal direction of the slit portion; Wherein the diameter of the reaction region is defined as a crucible diameter, the crucible diameter is 100 to 300 mm, and the thickness of the segment is 15 to 25 mm, and the number of the slit portions is (2).

&Quot; (2) "

는 슬릿부의 개수

는 세그먼트의 두께, Ø는 도가니의 직경이다. here

The number of slit portions

Is the thickness of the segment, and [phi] is the diameter of the crucible.

15 to 60 slits may be disposed in the cold crucible portion.

The cold crucible portion includes a cooling channel disposed inside the segment, and the diameter of the cooling channel may be in a range of 8 to 15 mm.

And a cooling tube for supplying and discharging cooling water for cooling the segment through the support portion, wherein the cooling tube is connected to the cooling channel.

The cooling passage may include an inlet passage through which cooling water is supplied and a discharge passage through which cooling water is discharged.

According to another aspect of the present invention, there is provided a cold crucible structure including a hollow upper cap and a lower cap, a plurality of segments connecting the upper cap and the lower cap, An induction coil portion disposed to surround the outer periphery of the cold crucible portion and the cold crucible portion, the induction coil portion including a reaction region surrounded by the segment and the segment, the induction coil portion being disposed to cross the longitudinal direction of the segment and the longitudinal direction of the slit portion; Wherein the diameter of the reaction zone is defined as a crucible diameter, the crucible diameter is in a range of 100 to 300 mm, and the thickness of the segment is in a range of 15 to 25 mm, And a cooling passage formed in the inside thereof with a diameter in the range of 8 to 15 mm, and the intervals of the slit portions are arranged by the following Equation (1), and the number of the slit portions is arranged by the following expression (2).

[Equation 1]

(mm)

(mm)

은 슬릿부의 간격이고, Ø는 도가니의 직경이다.

Is the distance between the slit portions, and? Is the diameter of the crucible.

&Quot; (2) "

는 슬릿부의 개수

는 세그먼트의 두께, Ø는 도가니의 직경이다. here

The number of slit portions

Is the thickness of the segment, and [phi] is the diameter of the crucible.

The spacing of the slit portions may be in the range of 0.3 to 4 mm.

15 to 60 slits may be disposed in the cold crucible portion.

And a cooling tube which is connected to the lower cap and supplies and discharges cooling water that passes through the support and cools the segment. The cooling tube may be connected to the cooling channel.

The cooling passage may include an inlet passage through which cooling water is supplied and a discharge passage through which cooling water is discharged.

According to the embodiment of the present invention, by optimizing the crucible diameter, the crucible thickness, the diameter of the cooling channel, the slit portion spacing, and the number of slit portions, the mechanical / thermal stability of the cold crucible structure as well as the magnetic field penetration efficiency, Can be improved.

It should be understood that the effects of the present invention are not limited to the above effects and include all effects that can be deduced from the detailed description of the present invention or the configuration of the invention described in the claims.

1 is a schematic perspective view of a cold crucible structure according to an embodiment of the present invention.
2 is a cross-sectional view of a cold crucible structure according to an embodiment of the present invention.
3 is a perspective view illustrating a cold crucible part of a cold crucible structure according to an embodiment of the present invention.
4 is a cross-sectional perspective view of a cold crucible part of a cold crucible structure according to an embodiment of the present invention combined with an induction coil part.
5 is a cross-sectional perspective view of a cold crucible structure according to an embodiment of the present invention.
6 is a plan view of a cold crucible structure according to an embodiment of the present invention.
7 is an enlarged plan view along the region A in Fig.
FIG. 8 is a graph showing a variation of a magnetic flux density according to a thickness of a segment of a cold crucible structure according to an embodiment of the present invention.
FIG. 9 is a graph showing a variation of the magnetic flux density according to the interval of the slit portions of the cold crucible structure according to the embodiment of the present invention.
FIG. 10 is a graph showing a variation of the magnetic flux density according to the number of slit portions of the cold crucible structure according to the embodiment of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described with reference to the accompanying drawings. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. In order to clearly illustrate the present invention, parts not related to the description are omitted, and similar parts are denoted by like reference characters throughout the specification.

Throughout the specification, when a part is referred to as being "connected" (connected, connected, coupled) with another part, it is not only the case where it is "directly connected" "Is included. Also, when an element is referred to as " comprising ", it means that it can include other elements, not excluding other elements unless specifically stated otherwise.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The singular expressions include plural expressions unless the context clearly dictates otherwise. In this specification, the terms "comprises" or "having" and the like refer to the presence of stated features, integers, steps, operations, elements, components, or combinations thereof, But do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, or combinations thereof.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a schematic perspective view of a cold crucible structure according to an embodiment of the present invention, FIG. 2 is a cross-sectional view of a cold crucible structure according to an embodiment of the present invention, and FIG. 3 is a cross-sectional view of a cold crucible structure according to an embodiment of the present invention. And a cold crucible portion.

1 to 3 show the induction coil part 210 omitted from the cold crucible structure 10 for easy explanation and the combined view of the induction coil part and the cold crucible part 100 will be described in detail later I will explain.

1 to 3, a cold crucible structure 10 according to an embodiment of the present invention includes a cold crucible portion 100, a cooling tube 380, and a receiving portion 400.

The cold crucible 100 includes an upper cap 110 and a lower cap 190. The upper cap 110 and the lower cap 190 may be formed in a hollow shape. For example, the upper cap 110 and the lower cap 190 may be formed in a ring shape for mechanical / thermal stability of the cold crucible 100.

Here, the upper cap 110 and the lower cap 190 are formed in a ring shape for easy explanation, but any shape can be used as long as the material can pass a substance such as a square ring shape or an octagonal ring shape Do.

The upper cap 110 and the lower cap 190 may be formed to have a predetermined thickness for mechanical / thermal stability. The upper cap 110 and the lower cap 190 may be formed to have a thickness defined by the inner diameter and the outer diameter of the upper and lower caps 110 and 190, May be formed to have a diameter equal to or larger than the thickness of the substrate. In other words, the upper cap 110 and the lower cap 190 may be formed to have a thickness D that is greater than the thickness D of the segment 130 for bonding to the segment 130, or the same thickness when the lower cap 190 is integrally formed. Here, the thickness (D) of the segments is the same as the thickness of the crucible, so that the thicknesses of the segments are used uniformly. The optimized thickness of the segment thickness D will be described later.

A plurality of segments 130 connecting the upper cap 110 and the lower cap 190 may be disposed in the cold crucible 100. Here, the segment 130 and the upper / lower caps 110 and 190 may be disposed independently or integrally. The present embodiment will be described as being integrally formed.

The plurality of segments 130 may be formed to correspond to the ring-shaped upper and lower caps 110 and 190 to form a cylindrical space. The inside of the cylindrical shape can form a reaction region of the cold crucible 100. The object can be dissolved in the reaction zone. The reaction zone is the same as the diameter of the crucible (Ø) and is hereinafter collectively referred to as the diameter (Ø) of the crucible.

It is important to increase the product by melting a large amount of the object in order to increase the production amount of the crucible diameter Ø. However, considering the dissolution efficiency and energy efficiency of the cold crucible structure 10, the crucible diameter Ø is 100 to 300 mm .

A slit 160 may be disposed between the segments 130. The slit portion 160 may be formed of an insulator. The slit portion 160 can improve the magnetic flux density of the segment 130 by improving the permeability of the magnetic field.

Meanwhile, the cold crucible structure 10 may be provided with a receiving unit 400 for supporting / fixing the cold crucible 100. The cold crucible 100 may be provided with a coupling portion 180 coupled to the receiving portion 400 at a lower portion of the lower cap 190.

And the cooling tube 380 may be disposed in the receiving portion 400. [ The cooling tube 380 may be provided with a cooling water supply portion for supplying the cooling water to the cooling flow path 310 of the segment 130 and a cooling water discharge portion for discharging the cooling water having completed the cooling of the cold crucible portion 100.

Here, the cooling tube 380 may be connected to the cooling channel 310 formed inside the segment 130. The cooling passage 310 is formed inside the segment 130 and connected to a cooling water hole 195 disposed at a lower portion of the lower cap 190.

The cooling water hole 195 may be disposed between the lower cap 190 and the engaging portion 180. The cooling water hole 195 is connected to the cooling tube 380 to supply the cooling water to the cooling passage 310, that is, the cold crucible 100 to cool the cold crucible 100.

As described above, the cold crucible structure 10 can cool the cold crucible 100, and the crucible structure 10 can be formed by forming the crucible diameter Ø formed in the inner diameter of the segment 130 to 100 to 300, The magnetic permeability and the dissolution efficiency can be improved while achieving mechanical / thermal stability of the magnetic layer.

FIG. 4 is a perspective view showing a cold crucible part and an induction coil part of a cold crucible structure according to an embodiment of the present invention, FIG. 5 is a sectional perspective view of a cold crucible structure according to an embodiment of the present invention, FIG. 7 is an enlarged plan view of the cold crucible structure according to the embodiment of FIG.

Hereinafter, Figs. 4 to 7 will be described with reference to Figs. 1 to 3 for the sake of simplicity and avoiding redundant description.

4 and 5, a cold crucible structure 10 according to an embodiment of the present invention includes an induction coil part 210 disposed in a direction crossing a longitudinal direction of a segment 130 of a cold crucible 100, .

The induction coil part 210 may be arranged so as to surround the outer diameter of the cold crucible 100. Here, the region where the induction coil portion 210 surrounds the outer diameter of the cold crucible portion 100 is defined as the melting region DSA. The outermost induction coil part 210 of the dissolution zone DSA and the end of the slit part 160 may be spaced apart from each other by a predetermined distance.

The slits 160 may be disposed between the segments 130. The slit portion 160 may separate the segments 130 and the cooling passage 310 may be disposed inside the segment 130. [

6 and 7, a plurality of segments 130 are arranged in the cold crucible structure 10. As described above, the segment 130 may form a reaction zone capable of reacting an object to form a product. Accordingly, the segment 130 for forming the reaction region must be formed to have a predetermined thickness so as to achieve the mechanical / thermal stability of the cold crucible 100.

Thus, in order to derive the optimum thickness (D) of the segment 130, the magnetic flux density was measured using a cold crucible structure having a crucible diameter (Ø) of 200.

8 is a graph showing a variation amount of magnetic flux density according to a thickness D of a segment of a cold crucible structure according to an embodiment of the present invention. Here, the thickness (D) of the segment was changed to measure the change of the magnetic flux density according to the thickness of the segment.

Referring to FIG. 8, the magnetic flux density of the cold crucible structure 10 decreases as the thickness D of the segment 130 increases. In other words, the thicker the thickness D of the segment 130, the lower the magnetic flux density, which may cause a decrease in energy efficiency and dissolution efficiency.

Specifically, increasing the thickness D of the segment 130 to achieve mechanical / thermal stability may result in lower magnetic flux penetration efficiency into the segment 130, resulting in a lower magnetic flux density. Therefore, the dissolution efficiency and energy efficiency of the cold crucible structure 10 may be deteriorated. In other words, the thinner the thickness of the segment 130, the higher the penetration efficiency of the magnetic field can be, and the dissolution efficiency of the cold crucible structure 10 can be improved.

Therefore, it is preferable that the cold crucible structure 10 use the thickness D of the segment 130 having a magnetic flux density of 90 G or more in consideration of energy efficiency and dissolution efficiency. As shown in FIG. 8, when the thickness D of the segment 130 is in the range of 15 to 25 mm, a magnetic flux density of 90 G or more is formed, and energy efficiency and dissolution efficiency are improved.

When the crucible diameter Ø is 200 mm, considering the mechanical stability, the magnetic permeability and the energy efficiency, the optimum thickness of the segment 130 is 16 to 19 mm.

If the crucible diameter Ø is 100 or 300, the thickness D of the optimum segment 130 can be changed according to the thickness D of the segment 130, and the thickness D of the optimum segment 130 can be changed according to the crucible diameter Ø It is preferable that the thickness D of the segment 130 is changed to cope with it.

Accordingly, the thickness (D) of the segment 130 is set in the range of 15 to 25 mm in consideration of the above-described conditions, whereby the size, mechanical stability, and dissolution efficiency of the cooling channel 310 can be improved.

Referring again to FIGS. 6 and 7, a cooling passage 310 may be disposed in each of the segments 130. The cooling passage 310 may be provided with an inlet passage and an outlet passage. The intake passage may be disposed adjacent to the segment 130 as a passage for receiving cooling water for cooling the cold crucible 100. The outflow channel is a passage for discharging the cooling water that has completed cooling. A pipe may be provided between the incoming and outgoing passages to separate the incoming and outgoing passages.

The cooling passage 310 should be formed to have a predetermined size to cool the cold crucible 100. In other words, if the cooling passage 310 is formed to be large, the supply of the cooling water may increase and the cooling efficiency may be increased. If the size of the cooling passage 310 is decreased, the supply amount of the cooling water may be decreased, .

Furthermore, since the cooling channel 310 is disposed inside the segment 130, there is a restriction depending on the thickness of the segment 130. [ That is, there is a problem that the thickness of the segment 130 must be increased in order to increase the size of the cooling channel 310. In addition, even though the thickness of the segment 130 is considered, if the cooling passage 310 is formed to increase the cooling efficiency, the mechanical stability of the cold crucible 100 may be deteriorated.

Therefore, it is necessary to measure the variation of the magnetic flux density with the size of the cooling passage 310. Table 1 is a table summarizing the data obtained by measuring the magnetic flux density by changing the size of the cooling passage 310.

Table 1 shows the results of comparison of the tendency of the magnetic flux density according to the shape of the cooling passage 310, based on the case where the crucible diameter is 200 mm.

As shown in Table 1, it is judged that the diameter of the cooling passage 310 does not affect the magnetic flux density. Size) does not affect magnetic flux density penetration

For example, if the diameter of the cooling channel 310 can be reduced, the thickness D of the segment can be made as small as possible, so that energy loss consumed in the cold crucible 10 can be reduced.

Conversely, if the diameter of the cooling passage 310 is too small, the cooling efficiency may be lowered. As a result, the cooling water passing through the cooling passage 310 is overheated and the cooling passage 310 is expanded, The pressure of the inside of the chamber can be explosively increased. In such a case, the cooling water lines connected to the cooling channel 310 may be blown.

Therefore, in order to minimize energy loss in the crucible 10, the diameter of the cooling channel 310 is preferably 8 mm or more, and the diameter of the cooling channel 310 is 15 mm or less for sufficient cooling efficiency .

In conclusion, it has been determined that the diameter of the cooling channel 310 is preferably 8 to 15 mm in consideration of the thickness of the segment 130 and the cooling efficiency.

Referring again to FIG. 6, the cold crucible 100 may be provided with a slit portion 160 for separating the plurality of segments 130, respectively. As described above, the greater the distance dslit between the slit portions 160, the greater the magnetic flux density formed in the segment 130. [ However, if the spacing dslit of the slit portion is increased to increase the magnetic flux density, problems such as leakage of product or reactant may occur. Therefore, it is preferable that the intervals dslit of the slit portions are arranged at intervals that can satisfy the above-mentioned conditions.

FIG. 9 is a graph showing a variation of the magnetic flux density according to the interval of the slit portions of the cold crucible structure according to the embodiment of the present invention.

Here, in order to compare the variation of the magnetic flux density with the interval dslit of the slit portions, the variation amount of the magnetic flux density was measured by changing the interval dslit of the slit portions based on the case where the crucible diameter is 200 mm.

Referring to FIG. 9, as the distance dslit between the slit portions increases, the magnetic flux density increases, but it can be determined that a saturation point also exists.

The spacing dslit of the slit portions can form an optimum gap according to the following expression (1).

은 슬릿부의 간격이고, Ø는 도가니 직경이다.here

Is the interval between the slit portions, and phi is the crucible diameter.

For example, when the crucible diameter (Ø) is 200 mm, the interval (dslit) of the slit portions is measured at an optimum interval of 1.2 mm. This corresponds to the case where the crucible diameter is 200. When the crucible diameter Ø is 100 mm or 300 mm, the optimum interval between the slit portions 160 is 0.6 to 1.8 mm according to the above- .

However, in order to increase the permeability of the magnetic field, it is preferable that the interval of the slit portions 160 is formed in the range of 0.3 to 4 mm.

6, the cold crucible 100 may be provided with a slit portion 160 for separating the plurality of segments 130 from each other. As described above, as the number of slit portions Nslit of the slit portion 160 increases, the magnetic flux density formed in the segment 130 may increase.

However, if the number of slit portions Nslit is increased to increase the magnetic flux density, the space for forming the cooling channel 310 can be reduced, so that the cooling flow rate can not be sufficiently secured and the cooling efficiency may be lowered. Therefore, it is preferable to dispose the number of slit portions nslit in a number that satisfies the above conditions.

FIG. 10 is a graph showing a variation of the magnetic flux density according to the number of slit portions of the cold crucible structure according to the embodiment of the present invention.

Here, in order to compare the variation of the magnetic flux density with the number of slits Nslit, the change amount of the magnetic flux density was measured by changing the number of slit portions Nslit in the 1/4 region based on the case where the crucible diameter is 200 .

Referring to FIG. 10, although the magnetic flux density increases as the number of slit portions Nslit increases, it can be determined that a saturation point also exists.

The number of slit portions Nslit can be optimized according to the following equation (2).

는 슬릿부 개수,

는 세그먼트(130)의 두께, Ø는 도가니의 직경이다. here

The number of slit portions,

Is the thickness of the segment 130, and phi is the diameter of the crucible.

For example, when the crucible diameter Ø is 200 mm, the number of slit portions (Nslit) was measured to be the optimum number of 36 pieces. This corresponds to the case where the crucible diameter is 200, and when the crucible diameter is 300, up to 54 slit portions Nslit may be the optimal number .

However, it is preferable to form the number of slit portions (Nslit) in the range of 15 to 60 in order to improve the penetration rate of the magnetic field and ensure the mechanical stability and the cooling flow rate.

As described above, the cold crucible structure 1 according to the embodiment of the present invention is characterized in that the thickness D of the segment, the diameter of the cooling passage 310, the slit portion spacing Dslit, and the number of slit portions Nslit), it is possible to improve the mechanical / thermal stability of the cold crucible structure 10, as well as the magnetic permeability, the dissolution efficiency and the energy efficiency.

It will be understood by those skilled in the art that the foregoing description of the present invention is for illustrative purposes only and that those of ordinary skill in the art can readily understand that various changes and modifications may be made without departing from the spirit or essential characteristics of the present invention. will be. It is therefore to be understood that the above-described embodiments are illustrative in all aspects and not restrictive. For example, each component described as a single entity may be distributed and implemented, and components described as being distributed may also be implemented in a combined form.

The scope of the present invention is defined by the appended claims, and all changes or modifications derived from the meaning and scope of the claims and their equivalents should be construed as being included within the scope of the present invention.

10: Cold crucible structure
100: cold crucible part
110: upper cap
190: Lower cap
130: Segment
D: thickness of the segment
160:
180:
195: cooling water hole
210: Induction coil part
DSA: dissolution zone
310:
380: cooling tube
400:
Ø: Crucible diameter
Dslit: Slit spacing

Claims (16)

A hollow crucible portion including a hollow upper cap and a lower cap, a plurality of segments connecting the upper cap and the lower cap, a slit portion disposed between the segments, and a reaction region surrounded by the segment; And
An induction coil portion disposed so as to surround the outer diameter of the cold crucible portion and arranged to cross the longitudinal direction of the segment and the longitudinal direction of the slit portion; , ≪ / RTI &
The diameter of the reaction zone is defined as the crucible diameter,
The crucible has a diameter of 100 to 300 mm,
And the intervals of the slit portions are arranged by the following formula (1). [Equation 1]

(mm)

Is the distance between the slit portions, and? Is the diameter of the crucible. The method according to claim 1,
And the interval between the slits is in the range of 0.3 to 4 mm. The method according to claim 1,
Wherein the cold crucible portion includes a cooling channel disposed inside the segment,
And the diameter of the cooling channel is in the range of 8 to 15 mm. The method of claim 3,
A pedestal connected to the lower cap,
And a cooling tube for supplying and discharging cooling water for cooling the segment through the support portion,
And the cooling tube is connected to the cooling flow path. The method of claim 3,
Wherein the cooling passage includes an inlet passage through which cooling water is supplied and a discharge passage through which cooling water is discharged. The method according to claim 1,
And the thickness of the segment is in the range of 15 to 25 mm. A hollow crucible portion including a hollow upper cap and a lower cap, a plurality of segments connecting the upper cap and the lower cap, a slit portion disposed between the segments, and a reaction region surrounded by the segment; And
An induction coil portion disposed so as to surround the outer diameter of the cold crucible portion and arranged to cross the longitudinal direction of the segment and the longitudinal direction of the slit portion; , ≪ / RTI &
The diameter of the reaction zone is defined as the crucible diameter,
Wherein the crucible diameter is 100 to 300 mm and the thickness of the segment is in the range of 15 to 25 mm,
And the number of the slit portions is arranged by the following equation (2).
&Quot; (2) "

here

The number of slit portions

Is the thickness of the segment, and [phi] is the diameter of the crucible. 8. The method of claim 7,
And 15 to 60 slits are arranged in the cold crucible portion. 8. The method of claim 7,
Wherein the cold crucible portion includes a cooling channel disposed inside the segment,
And the diameter of the cooling channel is in the range of 8 to 15 mm. 10. The method of claim 9,
A pedestal connected to the lower cap,
And a cooling tube for supplying and discharging cooling water for cooling the segment through the support portion,
And the cooling tube is connected to the cooling flow path. 10. The method of claim 9,
Wherein the cooling passage includes an inlet passage through which cooling water is supplied and a discharge passage through which cooling water is discharged. A hollow crucible portion including a hollow upper cap and a lower cap, a plurality of segments connecting the upper cap and the lower cap, a slit portion disposed between the segments, and a reaction region surrounded by the segment; And
An induction coil portion disposed so as to surround the outer diameter of the cold crucible portion and arranged to cross the longitudinal direction of the segment and the longitudinal direction of the slit portion; , ≪ / RTI &
The diameter of the reaction zone is defined as the crucible diameter,
Wherein the crucible diameter is 100 to 300 mm and the thickness of the segment is in the range of 15 to 25 mm,
Wherein the cold crucible portion includes a cooling flow passage having a diameter within a range of 8 to 15 mm inside the segment,
And the number of the slit portions is arranged by the following equation (2): " (2) "
[Equation 1]
(mm)

Is the distance between the slit portions, and? Is the diameter of the crucible.
&Quot; (2) "

here

The number of slit portions

Is the thickness of the segment, and [phi] is the diameter of the crucible. 13. The method of claim 12,
And the interval between the slits is in the range of 0.3 to 4 mm. 13. The method of claim 12,
And 15 to 60 slits are arranged in the cold crucible portion. 13. The method of claim 12,
A pedestal connected to the lower cap,
And a cooling tube for supplying and discharging cooling water for cooling the segment through the support portion,
And the cooling tube is connected to the cooling flow path. 13. The method of claim 12,
Wherein the cooling passage includes an inlet passage through which cooling water is supplied and a discharge passage through which cooling water is discharged.

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