JPH07266006A - Nozzle for manufacturing amorphous metal ribbon - Google Patents

Abstract

(57) [Summary] [Purpose] The structure of the injection nozzle is not changed from the conventional one, and the paddle length is adjusted by only changing a part of the material, and thus the thickness of the amorphous metal ribbon is properly adjusted. It is an object of the present invention to provide a low-cost injection nozzle that can be controlled as desired. A jet nozzle of molten metal for forming a pool of molten metal on a surface of a cooling roll that rotates at a high speed to produce an amorphous metal ribbon, wherein the jet nozzle of the jet nozzle is provided on the lower surface side of the tip of the jet nozzle. A nozzle for producing an amorphous metal ribbon, characterized in that a material having a wettability with respect to a molten metal is disposed rather than a material of a slit portion.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for producing an amorphous metal ribbon, and more particularly to a quenched metal ribbon produced by injecting molten metal onto the outer periphery of a cooling roll under high speed rotation to rapidly solidify it. Related to the injection nozzle of the molten metal used in the manufacturing equipment.

[0002]

2. Description of the Related Art As a method for producing a quenched metal ribbon, a molten metal is jet-supplied onto the outer peripheral surface of a cooling roll which is rotating at a high speed, and the molten metal is rapidly solidified by the heat removal action of the cooling roll. Is common. At that time, in order to control the plate thickness of the metal ribbon, the size of a basin (hereinafter referred to as a paddle) formed between a nozzle for supplying molten metal (hereinafter referred to as an injection nozzle) and a cooling roll. Is required to be maintained properly, and as a method therefor, for example, JP-A-62-183942 or JP-A-58-1323.
The technology disclosed in Japanese Patent Publication No. 56 is proposed.

These methods maintain the gap between the jet nozzle and the roll at an appropriate value as a means for controlling the size of the paddle, particularly the length. In addition to this method, a method of maintaining the speed of the roll, the injection pressure of the molten metal, or the thickness of the slit of the nozzle for injecting the molten metal at an appropriate value is generally used. Fiedler et al. Are Journal of materials Scie
nce, vol. 19 (1984) page 3229-3.
Positively applying the relationship between the plate thickness similar to the following empirical formula reported in 235, the distance between the injection nozzle and the roll, the slit thickness of the injection nozzle, the roll speed, or the injection pressure of the molten metal. Is.

T = 2/3 (g / s) ^1/4 × s / v (2p / ρ) ^1/2 t: thin strip plate thickness s: slit thickness g: gap between jet nozzle and cooling roll v: Roll peripheral speed p: Molten metal injection pressure ρ: Molten metal density On the other hand, the inventors of the present invention first invented and, as a patent pending technology, to continuously blow a compressed gas to the paddle at the tip of the injection nozzle. There is a characteristic method for producing an amorphous alloy metal ribbon.

However, JP-A-62-183942
In the plate thickness control method and apparatus described in Japanese Patent Laid-Open No. 58-132356, the size of the paddle formed between the jet nozzle and the roll, in particular its length, depends on the distance between the jet nozzle and the roll. In addition to the nozzle slit thickness, the roll speed, the molten metal temperature, and the injection pressure, the inventors' research has revealed that there are too many factors that affect the wet length of the molten metal with respect to the nozzle tip. Therefore, this length varies depending on the material of the jet nozzle tip, the surface roughness, the molten metal temperature, the distance between the jet nozzle and the roll, the roll speed, or the history of the jet pressure of the molten metal. .

Therefore, as a method for controlling the wetting length, the inventor, as mentioned above, is characterized by continuously blowing a compressed gas to the paddle at the tip of the nozzle. A band manufacturing method was developed and applied for a patent, in which the length of the paddle was regulated so that the plate thickness of the thin band to be manufactured could be maintained with high accuracy and uniformity. However, this method has a problem in that the shape of the injection nozzle used is complicated, and therefore the price of the injection nozzle itself is high, and it was a step forward for practical use.

[0007]

SUMMARY OF THE INVENTION In view of the above circumstances, the present invention does not change the structure of the injection nozzle to be used from the conventional one, but adjusts the paddle length by only changing a part of the material. An object of the present invention is to provide a low-cost injection nozzle capable of appropriately controlling the plate thickness of an amorphous metal ribbon.

[0008]

Means for Solving the Problems The inventor has made earnest studies for achieving the above object, and as a result, has focused on partially changing the material of the tip portion of the injection nozzle. The present invention was conceived, knowing that a phenomenon in which the paddle length becomes long can be avoided by disposing a material having a low wettability with respect to molten metal in parallel with the slit of the nozzle. That is, the present invention is a molten metal injection nozzle for producing an amorphous metal ribbon by forming a pool of molten metal on the surface of a cooling roll that rotates at a high speed. A nozzle for producing an amorphous metal ribbon, characterized in that a material having a wettability with respect to a molten metal is arranged as compared with a material of a slit portion of an injection nozzle. Further, the present invention is characterized in that the distance between the material having low wettability and the edge of the slit is 0.1 mm or more and 3 mm or less.
The nozzle for producing the amorphous metal ribbon described is preferable.

In this case, the disposing position of the material having low wettability is on the outflow side and / or the non-outflow side of the molten metal from the pool.

[0010]

In the present invention, in a molten metal injection nozzle for producing an amorphous metal ribbon by forming a pool of molten metal on the surface of a cooling roll that rotates at a high speed, on the lower surface side of the tip of the injection nozzle, Since the material having a lower wettability with respect to the molten metal than the material of the slit portion of the injection nozzle is arranged, the molten metal pool is prevented from squeezing out from the lower surface of the nozzle to the outflow side and the non-outflow side of the molten metal. Therefore, the length of the paddle formed between the jet nozzle and the cooling roll is regulated, and the plate thickness of the amorphous metal ribbon can be made uniform. Further, in the present invention, the distance between the plate-shaped material and the edge of the slit is set to be 0.1 mm or more and 3 mm or less, so that the free boundary surface of the paddle collapses and so-called paddle break occurs. It becomes possible to more easily achieve the uniform plate thickness while preventing the above.

The reason why the distance between the material having a low wettability with the molten metal and the edge of the slit is 0.1 mm or more and 3 mm or less is that if the value is less than 0.1 mm, the reliable distribution to the nozzle tip is ensured. If the thickness is 3 mm or more, the paddle length becomes too large and the amorphous metal ribbon has a plate thickness of 100 mm.
This is because the thickness exceeds μm and cooling cannot be performed to meet the amorphization.

The contents of the present invention will be described below with reference to FIG. 1 in an embodiment.

[0013]

EXAMPLE FIG. 1 is an example of using the nozzle for producing an amorphous metal ribbon according to the present invention. As is clear from FIGS. 1A and 1B, the thickness is 0.6 mm, the width is 25 mm, and the height is 5 m.
A plate-shaped material of silicon nitride ceramics 6 having a length of 30 mm, a width of 2 mm, and a thickness of 1 mm is provided on the lower surface 1 of the tip of a quartz glass injection nozzle 5 having a slit for injecting molten metal of m and on both sides sandwiching the slit. Are arranged in parallel with the molten metal ejection slit at intervals of 0.5 mm on the outflow side and 0.7 mm on the non-outflow side from the edge of the ejection slit. As the disposing method, adhesion is used here, but any known means can be used. Then, while maintaining the distance between the lower end surface 1 of the injection nozzle 5 and the cooling roll 2 at 0.25 mm, the molten metal made of the Fe-Si-B-based alloy is supplied at a peripheral speed of 2
2000mmH on the surface of roll 2 rotating at 0m / s
_It was jetted at a pressure of ₂ O and rapidly cooled to produce an amorphous metal ribbon.

As a result, it was possible to obtain a strip having a uniform thickness with a thickness deviation of 2 μm or less in the width direction and the longitudinal direction of the strip.
In this embodiment, the silicon nitride ceramic is used as the material having a low wettability with the molten metal, but the present invention is not limited to this. For example, mullite, cermet of tungsten carbide, tungsten carbide cobalt. Cermet, alumina, silica, etc. can be adopted.

[0015]

As described above, according to the present invention, a material having a smaller wettability with respect to the molten metal than the nozzle material is provided on one side of the slit for injecting the molten metal on the lower surface of the tip of the molten metal injection nozzle. Since it is arranged parallel to the slit, the length of the paddle formed between the nozzle tip and the cooling roll can be prevented from squeezing out to the upstream side and the downstream side of the molten metal injection slit, and the paddle for the cooling roll can be prevented. By controlling the wetting length of, it became possible to precisely control the thickness of the thin strip. As a result, the product quality and the yield were improved and the productivity was increased as compared with the conventional products.

[Brief description of drawings]

1A and 1B are views showing an example in which a nozzle for producing an amorphous metal ribbon according to the present invention is implemented, in which FIG. 1A is a side view and FIG.
[Fig. 3] is a view of (a) taken along the line AA.

[Explanation of symbols]

 1 Lower surface of nozzle tip 2 Cooling roll 3 Paddle (melting pool) 4 Molten metal 5 Injection nozzle 6 Material with low wettability 7 Amorphous metal ribbon 8 Air knife (Peeling ribbon from cooling roll)

Claims (2)

[Claims] 1. A jet nozzle of molten metal for producing an amorphous metal ribbon by forming a pool of molten metal on a surface of a cooling roll rotating at high speed, the jet being provided on a lower surface side of the tip of the jet nozzle. A nozzle for producing an amorphous metal ribbon, characterized in that a material having a lower wettability with respect to a molten metal than a material of a slit portion of the nozzle is provided. 2. The nozzle for producing an amorphous metal ribbon according to claim 1, wherein the interval between the material having low wettability and the edge of the slit is 0.1 mm or more and 3 mm or less. .