JPS5823826B2 - Manufacturing method of rapidly solidified alloy thin plate - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Conventionally, the production of grain-oriented silicon steel sheets with high added value requires many processes such as various rolling processes, which involve a large amount of energy consumption.

Recently, efforts have been made to rapidly cool molten metal alloys to directly obtain metal alloys with high added value (such as good magnetic properties), which have properties that meet purposes such as transformer cores for electronic equipment or power equipment. Alloys with

As shown in FIG. 1, a commonly used quenching method involves ejecting high-temperature alloy molten metal 3 onto a rotating cylinder 1 from a nozzle 4 having a small hole or slit in a crucible 2.
In many cases, a band-shaped metal alloy 5 is obtained by rapid cooling on the surface of the metal alloy.

However, this rapid cooling method has the following drawbacks.

(1) Because it is ejected into the atmosphere at a high temperature, material deterioration, such as oxidation of the metal alloy surface, is likely to occur. Because it is at the interface with the atmosphere, alteration and deformation such as sintering is likely to occur.

(3) Since the rotating cylinder also comes into direct contact with the high-temperature molten metal, it becomes instantly hot and susceptible to oxidation and deterioration.

(4) Although the rapid cooling method is a simple manufacturing method, it is difficult to adjust the manufacturing process.

The present invention aims to eliminate the above-mentioned drawbacks and to produce a more uniform strip-shaped rapidly solidified alloy for use in iron cores, etc.

The present invention will be described in detail below with reference to FIG. 2 showing an embodiment thereof.

As shown in Fig. 2, a rotating cylinder 1 with a diameter of 100 cfrL
Rotate at 600 rpm.

A nozzle 4 at the bottom of a quartz crucible 2 containing 32% Si-containing molten iron (molten alloy) 3 is arranged so that the molten metal comes into contact with the rotating cylinder 1 at a position moved by 15° in the rotational direction from directly above it. The crucible 2 is equipped with stainless steel fluid conduits 6 and 7 arranged around the crucible 2.

Helium gas is then flowed from the inner conduit 6 at a rate of 51/min into the rotating cylinder around the rotating cylinder in parallel with the spouted molten metal, and liquid nitrogen is jetted through the conduit 7 at a rate of 31/min to the outside of the helium flow.

The distance between the ends of these fluid conduits 6 and 7 and the side surface of the rotating cylinder 1 is 5 mrn.

By using the above-described apparatus, a strip-shaped metal alloy 5 having uniform and good properties can be obtained.

The thus obtained strip-shaped metal alloy has a surface metal oxide content that is 1/1 that of an alloy strip produced by a conventional manufacturing method.
It can be controlled to 10 or less.

In addition, the surface of the rotating cylinder must be kept smooth to produce a homogeneous strip-shaped alloy, but the surface of the rotating cylinder is less susceptible to changes such as oxidation, and at the same time, it is constantly cooled with liquid nitrogen, so the temperature It takes about 15 times longer to produce similar surface roughness than the rotating cylinder used in the conventional method.

Furthermore, since the atmosphere around the nozzle does not contain air, it was possible to maintain the same diameter for a long time, and a uniform strip-shaped alloy could be supplied.

As described above, by using the method of the present invention, a strip-shaped alloy thin plate can be manufactured more stably and with uniform quality.

The same method can also be applied to the production of various strip-shaped alloys containing nickel, cobalt, etc. as main components.

Further, the fluid conduit material of the present invention may be a metal conduit made of stainless steel, copper, aluminum, etc., or an inorganic conduit made of quartz, alumina, etc.

In the above embodiments, helium and liquid nitrogen were used as the fluids introduced into the conduit, but neon other than helium, inert gases such as argon, air, oxygen, hydrogen, nitrogen,
Even when using active gases such as inorganic and organic gases such as carbon monoxide, carbon dioxide, and methane, or a mixture of two or more of these gases, the manufacturing atmosphere is stable and it is possible to produce homogeneous products that suit the purpose. It is.

Although inert gas is good for insulating the molten alloy from the atmosphere, it is also possible to flow a fluid (such as CO) that is reactive with the molten alloy.
It can also be applied to applications that change the composition of molten alloys (such as carburizing).

Note that the use of liquid nitrogen in the present invention can also produce a similar cooling effect with liquid air or the like depending on the purpose.

[Brief explanation of the drawing]

Figure 1 is a schematic diagram showing a conventional method for manufacturing rapidly solidified alloy thin plates;
FIG. 2 is a schematic diagram showing a method of manufacturing a rapidly solidified alloy thin plate according to an embodiment of the present invention. 1... Rotating cylinder, 2... Crucible, 3.
...Alloy molten metal, 4...Nozzle, 5...
...Band metal alloy, 6,7...Fluid conduit.

Claims (1)

[Scope of Claims] 1. A high-temperature alloy molten metal is ejected from a nozzle onto the circumferential surface of a rotating cylinder, and at the same time, one or more types of fluid are ejected from a fluid conduit arranged around the outer periphery of the nozzle in parallel to the ejected molten metal fluid. A method for producing a rapidly solidified thin alloy sheet, the method comprising spraying the thin alloy sheet onto a thin sheet of rapidly solidified alloy. 2. The method for producing a rapidly solidified alloy thin plate according to claim 1, characterized in that an inert gas such as helium, neon, or argon is sprayed onto the rotating cylinder at the outer periphery of the nozzle. 3. Claim 1, characterized in that an inert gas is sprayed onto a rotating cylinder on the outer periphery of the nozzle, and a fluid below room temperature, such as liquid air or liquid nitrogen, is flowed outside the inert gas. A method for producing rapidly solidified thin alloy sheets.