JPH0722807B2 - Nozzle for manufacturing metal ribbon - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention ejects a molten metal (including alloy) onto the surface of a moving cooling substrate and rapidly solidifies it to continuously produce an amorphous or crystalline metal ribbon. It relates to a nozzle used at that time.

[0002]

2. Description of the Related Art Conventionally, various methods such as a single roll method and a twin roll method have been disclosed as a method for directly and continuously producing a ribbon from a molten metal. A nozzle having an opening under a predetermined pressure is jetted and solidified onto a cooling substrate facing the nozzle opening to form a continuous ribbon. In that case, the shape of the nozzle used is
For example, the one as shown in JP-A-53-53525 (shown in FIG. 7) is general.

Further, Japanese Patent Laid-Open No. 58-77746 proposes a molten metal jet nozzle in which a reinforcing body is bridged upstream of the slit of the nozzle body. Further, JP-A-55-18582 discloses a method for producing an amorphous metal using a molten metal nozzle container having a plurality of nozzle openings.

By the way, the limit of the thickness of the ribbon obtained by rapid solidification is not limited to the amorphous metal ribbon under severe cooling conditions, but also for the crystalline metal from which the limitation of amorphization is removed. Also exists. The inventors of the present invention tried to manufacture a quenched metal ribbon having a large plate thickness by applying the conventional technique, but there was a limit thickness depending on the type of alloy, the material of the cooling substrate, and the cooling capacity, and the limit was limited by the conventional technique. It was found that forcibly increasing the thickness more than the thickness causes problems such as defective shape of the ribbon and deterioration of characteristics.

Based on the above experimental results, the present inventors have concluded that the essential measure for producing a metal ribbon having a large plate thickness and stable shape and characteristics is It was that there was no choice but to drastically improve the cooling capacity.

Therefore, the inventors of the present invention use a nozzle having a plurality of slots to eject molten metal from each slot, and the ejected molten metal overlaps and forms a pool of molten metal formed on a cooling substrate. Then, a method for producing a metal ribbon having a large plate thickness was proposed in Japanese Patent Application Laid-Open No. 60-199553.

A nozzle having a plurality of slots used in this method is shown in FIG. According to the experiments by the present inventors, this type of nozzle is suitable for manufacturing a quenched metal ribbon having a large plate thickness and good surface shape and characteristics, but when the length 1 of the slot 2'is increased. , The slot width may be deformed due to the influence of heat during use, or between the slots d ₁ and d ₂
There is a possibility that it may become unusable after that because it may crack or fall off.

[0008]

DISCLOSURE OF THE INVENTION The present invention provides a nozzle which is prevented from being deformed or damaged when producing a quenched metal ribbon having a large plate thickness and a wide width (at least 30 mm or more). .

[0009]

SUMMARY OF THE INVENTION According to the present invention, in a nozzle for producing a metal ribbon by jetting and cooling molten metal onto a surface of a moving cooling substrate, an edge portion having a height necessary for forming a slot width and It is characterized in that a support portion is provided on one surface and a partition plate having the other surface smoothed is overlapped in the same direction, a plurality of slots are formed in the moving direction of the cooling substrate, and the slots are detachably fitted to the pedestal. A multi-slot nozzle for producing a metal ribbon is provided.

The present invention will be described below with reference to the drawings. Figure 1
FIG. 1A shows the nozzle opening of the present invention at A- in FIG.
A'longitudinal side view, (b) is a bottom view, (c) is an explanatory view of the nozzle opening shape, 1 is a pedestal provided at the bottom 6 of the crucible, and 2 is a partition plate constituting the slot 2 '. Further, FIG. 3A is a vertical side view of the partition plate 2, and FIG.
Reference numeral 10 is an edge portion, and 3 is a support portion provided at appropriate intervals to reinforce and support the partition plate 2. The opposite surface on which the edge portion 10 and the support portion 3 are provided forms a smooth surface 11. The height of the edge portion and the support portion 3 is made equal to the width W of the slot 2 ', as shown in FIG. 3 (b). The tip of the supporting portion 3 may be tapered as shown in FIG. 3 (a) so that the molten metal flowing out from the slot 2'can be easily merged and integrated. Further, the support portion 3 is shown in FIGS.
It may be formed in a projection shape as shown in FIG.

FIG. 5 shows a mode in which the nozzle of the present invention is set in a large melting furnace in which the melting high-frequency coil 8 and the crucible are integrated, and 5 is a bolt for integrating the pedestal 1 divided into two parts. is there. Reference numeral 7 is a taper portion provided so that the base 1 and the crucible bottom portion 6 are in close contact with each other, and 9 is a cooling roll.

In assembling the nozzle of the present invention, the partition plates 2 are piled up in the required number of slots in the same direction, and fitted into the pedestal 1 so that the tapered portions 7 are aligned with each other. A nozzle having a slit width equal to is formed (see FIGS. 1 (b) and 5 (b)).

When a gap is created between the partition plate 2 and the pedestal 1, a dummy plate 4 is inserted to fill the gap. Further, as shown in FIG. 5C, if the pedestal 1 is configured so that it can be divided into two in the direction of the opening, cleaning and repairing are easy when it is reused.

It is preferable that the pedestal 1 and the partition plate 2 are made of material having a similar coefficient of thermal expansion, such as SiO ₂ , Al.
A highly accurate product can be manufactured by heat-processing ₂ O ₃ , Si ₃ N ₄ or the like, or by machining a material such as BN having good machinability.

Since the present invention is constructed as described above, when the metal strip is manufactured, even if the molten metal flows out from the slot 2'along the partition plate 2, the supporting portion 3 reinforces and supports the partition plate 2. Since the edge portion constitutes the short side of the slot, the partition plate 2 is deformed by heat, and a stable molten metal flow can always be obtained without changing the slot width.

FIG. 6 shows a case in which the nozzle of the present invention is arranged along the circumferential surface of the cooling roll (cooling substrate) 9, in which the intervals between the tip of each slot and the roll surface are made equal. . Further, in this case, the interval can be changed stepwise.

[0017]

EXAMPLE BN is selected as the nozzle material, and a partition plate 2 as shown in FIG. 3A is used to make a nozzle having three openings as shown in FIG. 1C (opening length l 75 mm width W 0.4 mm distance between openings d ₁ = d ₂ 1 mm) was assembled and the amorphous alloy thin film of the component Fe _80.5 Si _6.5 B ₁₂ C ₁ (atomic%) was prepared by the single roll method using the roll made of copper. The obi was manufactured.

Manufacturing conditions are as follows: the distance between the roll surface and the nozzle surface is 0.15 mm, the jet pressure is 0.25 kg / cm ² , and the roll surface speed is 2.
It was 5 m / sec. As a result, the nozzle after use was not deformed or damaged, and the residual hot water was slightly attached to the nozzle, and it could be used again by simple maintenance. The thickness of the obtained ribbon is 60 μm on average.
Completely amorphized, and had magnetic characteristics equivalent to those of the amorphous alloy ribbon of 30 μm in thickness manufactured by the conventional method (single nozzle).

[0019]

INDUSTRIAL APPLICABILITY Since the invention nozzle is provided with the reinforcing portion for preventing the deformation and damage between the slots of the multi-slot nozzle, it is effective for the purpose of manufacturing a wide metal ribbon having a large plate thickness. Moreover, even in the case of a composition having a high melting temperature, it is possible to prevent the deformation and damage of the slot during the production of the ribbon, and it is easy to replace and clean the used nozzle, so that it can be repeatedly used, which is very effective.

[Brief description of drawings]

FIG. 1A is a vertical cross-sectional side view showing a state in which a nozzle of the present invention is attached to the bottom of a crucible, and FIG. 1B is a bottom view showing a state of attaching the nozzle of the present invention to the bottom of a crucible;
Further, (c) is an explanatory diagram of the nozzle opening shape.

FIG. 2 is an explanatory diagram of a plurality of nozzles.

FIG. 3A is a side view of a partition plate of the nozzle of the present invention, and FIG. 3B is a bottom view of the partition plate of the nozzle of the present invention.

FIG. 4 (a) is a side view of a partition plate different from FIG.
(B) is a bottom view of the partition plate different from FIG. 3.

5 (a) is a vertical sectional side view showing an example in which the nozzle of the present invention is attached to a melting furnace in which a crucible and a high-frequency melting coil are integrally configured, FIG. 5 (b) is a side view, and FIG. It is a bottom view.

FIG. 6 is an explanatory view showing a case where the nozzle of the present invention is provided along the circumferential surface of a cooling roll.

7A and 7B are explanatory views of a nozzle of a conventional example.

[Explanation of symbols]

 1 pedestal 2 partition plate 2'slot 3 support part 4 dummy plate 5 bolt 6 crucible bottom part 7 taper part 8 high frequency coil 9 cooling roll 10 edge part 11 smooth surface

Claims (2)

[Claims] 1. A nozzle for producing a metal ribbon by jetting and quenching a molten metal onto a surface of a moving cooling substrate, an edge portion and a supporting portion having a height required for forming a slot width are provided on one side, A multi-slot nozzle for producing thin metal strips, characterized in that partition plates with smooth surfaces are aligned in the same direction, a plurality of slots are formed in the moving direction of the cooling substrate, and the slots are detachably fitted into the pedestal. . 2. The multi-slot nozzle for producing a metal ribbon according to claim 1, wherein partition plates are superposed so that the tips of the respective slots are along the circumferential surface of the cooling roll.