JPH07278802A - Graphite crucible device - Google Patents

Abstract

PURPOSE:To attain high efficiency heating and stable holding of a graphite crucible by fitting an outer peripheral surface of the graphite crucible housing a material to be melted to an inner peripheral surface of an induced heating member disposed outside the crucible in a tapered shape. CONSTITUTION:The induced heating member 13 composed of an isotropic graphite cylindrical member is disposed outside the graphite crucible 12 made of glassy carbon. Both the induced heating member 13 and the graphite crucible 12 are arranged in a refractory crucible 15 made of porous alumina, etc., and carbon fiber and a heat insulating material 16 such as alumina cement are packed in a space inside the refractory crucible 15. The induced heating member 13 is induction-heated by induction coils 14 disposed around the refractory crucible 15 and a material to be melted 11 housed in the graphite crucible 12 is heated and melted via the graphite crucible 12. In a graphite crucible device 10, the induced heating member 13 is held and fixed by the heat insulating material 16 and is formed to a cylindrical form or a crucible form and further the inner peripheral surface 18 thereof and the outer peripheral surface of the graphite crucible 12 are made to a tapered shape so that they can fit to each other.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to aluminum,
The present invention relates to a graphite crucible device used when a metal such as silver is melted and deposited on the surface of a sheet-shaped material.

[0002]

2. Description of the Related Art Conventionally, as a graphite crucible device of this type, as shown in FIG. 3 of Japanese Patent Laid-Open No. 4-101385, a heat insulating material is provided inside a refractory crucible 32 having an induction coil 31 arranged on the outer periphery thereof. A graphite crucible 34, which is an induction heating member, is fixed via 33a, and a graphite crucible 36 made of glassy carbon and containing a substance 35 to be melted therein is provided with a predetermined gap inside the graphite cylinder 34. Is fixed on the bottom heat insulating material 33b of the refractory crucible 32, and the graphite crucible 36 made of the glassy carbon is heated by induction heating the graphite tubular body 34 to melt the melted material 35. Device 30 has been proposed.

[0003]

However, in the above-mentioned conventional graphite crucible device 30, the graphite crucible 3 is not used.
6 is fixed on the heat insulating material 33b while maintaining a gap with the graphite tubular body 34. Therefore, the heat of the graphite tubular body 34 heated by induction heating is efficiently supplied to the graphite crucible 36.
It is difficult to reach the target 35 and it takes time to dissolve the material 35 to be melted. In addition, since the graphite crucible 36 is fixed on the heat insulating material 33b, the graphite crucible 36 tends to become unstable during the movement of the graphite crucible device 30, and the graphite crucible 36 may tilt and the melted substance 35 may spill. was there.

The present invention has been made to solve the above problems, and an object thereof is to heat a graphite crucible containing a material to be melted with high efficiency, and to stably hold the graphite crucible. It is to provide a graphite crucible device that can be used.

[0005]

In order to achieve the above object, a structural feature of the present invention is that a graphite crucible for accommodating a material to be melted and induction heating to be arranged outside the graphite crucible. In a graphite crucible device composed of a member and an induction coil arranged around the induction heating member, the induction heating member is formed in a cylindrical shape or a crucible shape, and the outer peripheral side surface of the graphite crucible and the The inner peripheral side surface of the induction-heated member is tapered and fitted,
The induction heating member supports the graphite crucible.

[0006]

In the graphite crucible apparatus of the present invention configured as described above, at least the outer peripheral side surface of the graphite crucible for containing the material to be melted and the induction heating member having a cylindrical shape or a crucible shape. The inner peripheral side surface was tapered and fitted. Therefore, when the member to be heated by induction heats by induction, the graphite crucible can be efficiently heated, and the substance to be melted inside the graphite crucible can be dissolved in a short time. In addition, the detachability of the graphite crucible, which occurs due to the absence of the gap between the graphite crucible and the induction heating member, is fitted with the tapered shape, so that the graphite crucible is guided without being reduced. The heating member can be stably supported. As a result, the maintenance of the graphite crucible, which requires regular inspection and replacement, can be facilitated, the mobility of the graphite crucible device can be increased, and the productivity can be improved.

[0007]

EXAMPLES The present invention will be described below based on examples. Example 1

FIG. 1 shows a schematic sectional structure of a graphite crucible device 10 according to an embodiment of the present invention. This graphite crucible apparatus 10 is a graphite crucible 1 for containing a substance 11 to be melted.
2, a graphite cylindrical member 13 that is an induction-heated member for fitting and supporting the graphite crucible 12, and a refractory crucible 15 in which the graphite cylindrical member 13 is housed and an induction coil 14 is arranged on the outer periphery. And a heat insulating material 16 between the graphite crucible 12 and the graphite cylindrical member 13 and the refractory crucible 15.

In this graphite crucible apparatus 10, the graphite crucible 12 is formed of glassy carbon having a thickness of about 3 mm and a peripheral side surface formed into a taper shape of 5 degrees. The graphite cylindrical member 13 has a thickness of about 7 mm and is formed of isotropic graphite which is excellent as an induction heating member so as to fit with the outer peripheral side surface 17 taper of the graphite crucible 12. Next, the refractory crucible 15 is made of porous alumina and has the induction coil 14 connected to a high frequency power source (not shown) on the outer periphery thereof.

Then, the graphite cylindrical member 13 was housed inside the refractory crucible 15, and the graphite cylindrical member 13 was fixed in the refractory crucible 15 by filling a carbon fiber and alumina cement between them. Next, the graphite crucible 12 containing the substance to be melted was fitted into the graphite cylindrical member 13 so as to be detachably supported.

The refractory crucible 15 is preferably non-conductive, and the heat insulating material 16 may be carbon particles (carbon black) or an inorganic substance (alumina fiber, etc.) in addition to carbon fibers. The graphite cylindrical member 13 may be anisotropic graphite.

A graphite crucible device 10 constructed as described above.
When an appropriate high-frequency current is supplied from a high-frequency power source (not shown), an induction current flows in the graphite cylindrical member 13,
Fever. Along with this, the graphite crucible 12 made of the glassy carbon is heated, and the contained substance 11 to be melted is melted.

Next, a description will be given of the manufacturing procedure of the graphite crucible 12 made of glassy carbon according to the present invention. First, the graphite crucible 12 made of glassy carbon is manufactured by using a thermosetting resin such as a phenol resin or a furfuryl alcohol resin or a thermosetting resin material (for example, furfururialcohol) as a starting material. That is, for example, when a phenol resin is used as a starting material, the powder is heated and pressure-molded to form a crucible-shaped molded body. When furfuryl alcohol is used as a starting material, it is housed in a metal forming die together with a catalyst if necessary and cured to form a crucible-shaped formed body. Then, each of the crucible-shaped compacts described above is carbonized in an inert gas atmosphere, processed if necessary, and heat-treated to produce the graphite crucible 12 made of the glassy carbon.

Next, the manufacturing procedure of the isotropic graphite cylindrical member 13 will be described. The isotropic graphite cylindrical member 13 pressure-molds carbon particles containing pitch into a block shape by cold isostatic pressing. Then, the molded body is sintered in an inert atmosphere to obtain an isotropic graphite block. Then, the isotropic graphite block was cut into a crucible shape by an NC lathe to manufacture a graphite cylindrical member 13. At this time, the inner peripheral side surface 18 of the graphite cylindrical member 13 is the outer peripheral side surface 1 of the graphite crucible 12.
7 was fitted and processed into a tapered shape so as to be supported.

By melting an aluminum lump at about 1450 ° C. and continuously vapor-depositing it on the surface of the sheet paper material, the outer peripheral side surface 1 of the graphite crucible 12 made of glassy carbon according to the present invention is used.
7, a graphite crucible device 10 in which a graphite cylindrical member 13 and an inner peripheral side surface 18 of the graphite cylindrical member 13 are fitted and supported by a taper, a graphite crucible 36 made of glassy carbon, and a graphite cylindrical member disposed with a predetermined gap on the outer periphery thereof. Using a graphite crucible apparatus 30 according to the prior art equipped with 34, the cycle of heating and cooling the material to be melted was repeated, and the results are shown in Table 1.

[0016]

[Table 1]

According to this result, the graphite crucible apparatus 10 of the present invention can dissolve the aluminum lump up to 1450 ° C. in a short time with respect to the conventional graphite crucible apparatus 30, and the cycle time is shortened to improve the productivity. It is possible to improve and reduce power consumption. Further, at that time, the inside of the graphite crucible 12 was heated more uniformly, the amount of molten aluminum remaining in the inner graphite crucible 12 was reduced, and the yield of the material could be improved.

Further, since the outer peripheral side surface 17 of the graphite crucible 12 for accommodating the melted material 11 and the inner peripheral side surface 18 of the graphite cylindrical member 13 are fitted in a tapered shape, regular maintenance is required. The graphite crucible 12 to be used could be easily attached and detached, and the workability could be greatly improved.

Embodiment 2 FIG. 2 shows a graphite crucible apparatus 2 according to a second embodiment of the present invention.
0 shows a schematic sectional structure of 0. This graphite-graphite crucible device 20 includes an inner graphite crucible 22 for accommodating a material to be melted 21 and an outer graphite crucible 23 as an induction heating member.
And a refractory crucible 25 having an induction coil 24 on the outer periphery
And a heat insulating material 26 between the outer graphite crucible 23 and the refractory crucible 25.

In this graphite crucible device 20, the inner graphite crucible 22 has a thickness of about 3 mm and has an outer peripheral side surface 27 of 5 mm.
Tapered in degrees and formed from glassy carbon. Further, the outer graphite crucible 23 has a thickness of about 5 mm, and the outer peripheral side surface 27 taper of the inner graphite crucible 22 and the inner peripheral side surface 28 of the outer graphite crucible 23 are fitted to each other, which is excellent as an induction heating member. Formed from isotropic graphite. Next, a refractory crucible 25 having an induction coil 24 connected to a high frequency power source (not shown) was formed on the outer periphery from porous alumina.

Then, the outer graphite crucible 23 was housed inside the refractory crucible 25, and the outer graphite crucible 23 was fixed to the refractory crucible 25 by filling a carbo fiber and alumina cement between them. Next, the graphite crucible 22 accommodating the material to be melted 21 was fitted and attached to the outer graphite crucible 23 so as to be detachably supported.

A graphite crucible device 20 constructed as described above.
In addition, when an induction current is appropriately supplied by a high frequency power source (not shown), the induction current flows through the outer graphite crucible 23,
Fever. Along with this, the inner graphite crucible 22 made of the glassy carbon is heated, and the contained substance 21 to be melted is melted.

Next, the graphite crucible device 20 of this embodiment is
Similar to the above-mentioned Example 1, the aluminum was melted and vapor-deposited to compare with the conventional graphite crucible apparatus 30. As a result, the graphite crucible apparatus 20 of the present invention was able to obtain the same effects as those of Example 1 described above, and in addition, even if the inner graphite crucible 22 made of the glassy carbon was broken, the melt 21 was not generated. It was possible to improve the reliability of the graphite crucible device 20 without flowing out from the outer graphite crucible 23.

[Brief description of drawings]

FIG. 1 is a schematic front sectional view for explaining a graphite crucible device including a cylindrical induction-heated member and a graphite crucible made of glassy carbon according to the present invention.

FIG. 2 is a schematic front sectional view for explaining a graphite crucible device including a crucible-shaped induction-heated member according to the present invention and a graphite crucible fitted therein.

FIG. 3 is a schematic front sectional view for explaining a graphite crucible device according to a conventional technique.

[Simple explanation of the sign]

 10 ... Graphite crucible device 11 ... Melting object 12 ... Graphite crucible 13 ... Induction heating member 14 ... Induction coil 15 ... Fire-resistant crucible 16 ... Insulation material 17 ... Outer peripheral side surface of graphite crucible 18 ... Inner peripheral side surface of induction-heated member

Claims (2)

[Claims] 1. A graphite crucible for containing a substance to be melted, an induction heating member arranged outside the graphite crucible, and an induction coil arranged around the induction heating member. In the graphite crucible apparatus, the induction heated member is formed in a cylindrical shape or a crucible shape, and the outer peripheral side surface of the graphite crucible and the inner peripheral side surface of the induction heated member are fitted in a tapered shape. Graphite crucible device characterized by. 2. The graphite crucible apparatus according to claim 1, wherein the graphite crucible is supported by the induction-heated member.