JPH07124714A - Production of fine wire of ti-based alloy - Google Patents

Abstract

PURPOSE:To continuously form a fine wire by oxidizing molten metal in a cooling liquid. CONSTITUTION:A cylindrical drum 1 is rotated via a revolving shaft 2 by a driving section 3. A cooling liquid layer 5 is formed by centrifugal force in the inside wall part of this cylindrical drum 1. A molten metal jet 9 is ejected from a nozzle 8 into the cooling liquid layer 5, the molten metal is solidified and the fine wire of the Ti-based alloy is produced. The jet 9 of the molten metal is generated by previously melting the metal raw material of the Ti-based alloy charged into a crucible 7 by a heater 10 while supplying the metal raw material under an inert gaseous atmosphere and jetting the molten metal from the nozzle 8 at the front end of the crucible 7 by the pressure of the inert gas (argon) for ejection from a introducing port 11. The molten metal is, thereupon, oxidized in the cooling liquid layer 5. The cooling liquid contg. a peroxide is used. A benzoyl peroxide, butyl peroxide or dicumyl peroxide is used as the peroxide. As a result, the disturbance of the molten metal is suppressed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a Ti-based alloy fine wire.

[0002]

2. Description of the Related Art In recent years, as a method for producing a thin metal wire having a circular cross section than a molten metal, a generally known spinning method in a submerged liquid has been proposed, and the technical establishment thereof has been rapidly advanced.
That is, as a conventional spinning method in a rotating liquid, Japanese Patent Application Laid-Open No. 56-16
5016, JP-A-57-52550, JP-A-57-
No. 79052 and the like, these prior arts form a cooling liquid layer by centrifugal force on the circumferential surface of a rotating cylindrical drum, and eject molten metal as a jet into the liquid layer,
This is a method of rapidly solidifying this to produce fine metal wires. According to these methods, it is possible to easily obtain fine metal wires having a circular cross section and excellent properties, and to cool at a higher cooling rate than the conventional method. Is suitable for the production of amorphous metal or crystalline metal fine wires.

[0003]

As described above, in the conventional rotary submerged spinning method, fine metal wires are manufactured by the above-described apparatus and process, which is very difficult as a method for directly obtaining fine metal wires from molten metal. Is an excellent method. But,
When this spinning submerged spinning method is applied as a method for producing a Ti-based alloy fine wire, depending on the type of the cooling medium, the Ti-based alloy can give only a metal powder rather than a fine wire, or even if a fine wire is obtained. Even if there are irregularities on the surface of the thin wire, or if the thin wire has a circular cross section,
There were many phenomena that were not desirable for practical use, such as gas porosity inside. It has been found that the main cause of this is the stability of the melt jet of a very active Ti-based alloy immediately before and immediately after entering the cooling medium.

In carrying out the above-mentioned spinning in liquid spinning method,
In order to improve the stability of the melt jet to be spun, it has been proposed to add Be or the like as a third element to the melt jet, but in this case, reaction with a nozzle or the like is unfavorable, and as a technique, Not established.
It has also been proposed to set the spinning atmosphere to an atmosphere in which the molten jet is slightly oxidized, but in this case, it has been found that secondary problems such as nozzle clogging occur.
Despite knowing that fine wire formability is good,
The reality is that no continuous thin line was obtained.

Therefore, in order to fundamentally solve the above-mentioned problems, the technical problem of the present invention is that when a Ti-based alloy fine wire is produced by a spinning submerged spinning method, a Ti-based alloy continuous fine wire with a stable melt jet is produced. To provide a method of obtaining.

[0006]

According to the present invention, a cooling liquid layer is formed in a rotating cylindrical drum by centrifugal force, and a jet of molten metal is jetted from the nozzle into the cooling liquid layer. In the method for producing a Ti-based alloy fine wire by solidification, a method for producing a Ti-based alloy fine wire, characterized in that the molten metal is oxidized in the cooling liquid.

[0007]

EXAMPLE A method for manufacturing a Ti-based alloy fine wire according to an example of the present invention will be described below together with a manufacturing apparatus for carrying out this method.

Reference numeral 1 denotes a cylindrical drum which is rotated by a drive unit 3 via a rotary shaft 2, and reference numerals 4 and 4'show bearings for supporting the rotary shaft 2. The cylindrical drum 1 has a cylindrical shape, and the cooling liquid layer 5 is applied to the inner wall of the cylindrical drum 1 by centrifugal force.
Are formed. In order to maintain the depth of the liquid layer 5, a donut-shaped support plate 6 is provided on one end surface of the cylindrical drum 1.

Reference numeral 7 is a crucible of molten metal, and 8 is a nozzle. The molten metal jet 9 ejected from the nozzle 8 toward the liquid layer 5 is a T that has been previously introduced into the crucible 7.
The metal raw material of the i-based alloy is melted by the heating device 10 while being supplied under an inert gas atmosphere, and the molten metal is melted by the pressure of the spouting inert gas introduced from the inlet 11 of the inert gas. The molten metal jet 9 generated by being ejected from the nozzle 8 immediately enters the liquid layer 5, is drawn by the inner peripheral wall of the cylindrical drum 1 by centrifugal force, and is rapidly cooled to be a thin metal wire. Is.

Using an apparatus having a cylindrical drum 1 having an inner diameter of 500 mmφ shown in FIG. 1, an alloy composed of Ti50Ni50 (at%) alloy is melted in an argon atmosphere at a temperature higher than the melting point by 50 ° C., and a pore diameter of 130 (μm) is obtained. From nozzle 8 of
The molten metal was controlled at a rate of 430 m / min by controlling the argon gas pressure to obtain a peroxide having a depth of 20 mm (benzoyl peroxide in the first embodiment, butyl peroxide in the second embodiment, dioctyl peroxide in the third embodiment). Spinning was carried out on the cooling liquid layer 5 (using mill peroxide) (0 ° C.) while the nozzle 8 was reversed in the width direction of the cylindrical drum 1 at a speed of 10 mm / S. The distance between the tip of the nozzle 8 and the cooling liquid layer 5 was 2 mm, and the spinning atmosphere was an argon atmosphere after vacuuming. The speed of the cylindrical drum 1 was 430 m / min. For comparison, tap water and liquid paraffin were used as cooling liquids and spun in the same manner as in the above-described examples. The results are shown in Table 1.

[0011]

[Table 1]

As is clear from Table 1, the thin wires obtained by the above-mentioned first to third embodiments have a cross-sectional shape close to a perfect circle, very few beads, and have good thin wire continuity. An alloy fine wire without porosity is obtained.
In other words, it is important that the cooling medium, which plays a role of improving the effect of the cooling liquid for improving the fine wire forming property, exerts some oxidation on the molten metal jet.

[0013]

As described above, in the case of the present invention, a cooling liquid layer is formed in the rotating cylindrical drum by centrifugal force,
In a method of producing a Ti-based alloy fine wire by injecting a molten metal jet from a nozzle into the cooling liquid layer and solidifying the molten metal jet, the cooling liquid jet immediately after the molten metal jet injected from the nozzle enters the cooling liquid layer. The surface of the molten jet is slightly oxidized by peroxide or the like in the layer, and as a result, the disorder of the molten metal can be suppressed and continuous thinning can be achieved.

The present invention is also effective for application to quenched materials such as amorphous.

[Brief description of drawings]

FIG. 1 is a sectional view of a manufacturing apparatus for carrying out a manufacturing method of the present invention.

[Explanation of symbols]

 1 Cylindrical drum 5 Cooling liquid layer 8 Nozzle 9 Molten metal jet

Claims (3)

[Claims] 1. A Ti-based alloy fine wire is manufactured by forming a cooling liquid layer in a rotating cylindrical drum by centrifugal force, injecting a jet of molten metal from a nozzle into the cooling liquid layer, and solidifying the molten metal jet. The method for producing a Ti-based alloy fine wire according to claim 1, wherein the molten metal is oxidized in the cooling liquid. 2. The method for producing a Ti-based alloy fine wire according to claim 1, wherein a material containing a peroxide is used as the cooling liquid, and the molten metal is oxidized by the peroxide. 3. The method for producing a Ti-based alloy fine wire according to claim 2, wherein benzoyl peroxide, butyl peroxide, or dicumyl peroxide is used as the peroxide.