JPS6038227B2 - How to make filaments directly from molten metal - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a method for producing straight filaments from molten metal (including copper and compounds, hereinafter the same) by a rapid cooling method.

As a method for directly obtaining filaments from molten metal, a method as shown in FIG. 1 is known.

That is, as shown in a, a raw material metal 4 is placed in the bottom of a tubular container 1 made of a heat-resistant material tube such as a quartz tube or an alumina tube, and heated in a heating furnace 5 with an inert gas atmosphere inside the container 1. After melting the raw metal 4, as shown in FIG.
This is a method in which the cooling member 6 is spouted out and brought into contact with the rotating cooling member 6. In addition to the above-mentioned roll, various types of cooling members are known, such as those shown in a, b, c, and d of FIG.

This method has the advantage that a long filament 42 having an arbitrary constant width and thickness can be obtained depending on the amount of molten metal 41 ejected, the rotational speed of the cooling member 6, etc. However, in this method, the melting of metal 4 and the ejection of metal 41 are performed at the same place, so metals containing rare elements such as metals or opposite elements such as Nd, V, Ti, Z, etc. When attempting to manufacture a filament of
In many cases, the spout 3 becomes clogged and the molten metal 41 cannot be spouted out. Furthermore, in the case of quartz, which is generally used as the nozzle 2 in this method, approximately 14
Since it becomes soft at 00q0, it has been difficult to make filaments of metals with higher melting points than this. Therefore, selection of the nozzle material in this method has been a serious problem in terms of its formability, reactivity with metal, thermal shock resistance, cost, etc.
In view of the above, the present invention aims to provide a method by which a filament of a high melting point or reactive metal can be easily obtained even when quartz, which is commonly used as a slurry, is used. The raw metal is melted in a separate (remote) part from the nozzle part, and the molten metal is transferred to the nozzle part and ejected from the nozzle spout, and the contact time between the molten metal and the nozzle is It is characterized by being made as short as possible. In comparison with the conventional method, the raw metal 4 is melted above the container 1, which is away from the nozzle 2, and the molten metal is not allowed to descend to the nozzle 2, but continues upward until the time of ejection. I'll have to stop it. In order to keep the molten metal above without letting it fall, it is possible to make the passage narrow in the middle or configure it so that it can be opened and closed. In order to avoid this, it is desirable to use a magnetic field to levitation restraint.

For melting raw metal, the so-called levitation melting method, in which the raw metal is suspended using a magnetic field and heated while in that state, may be adopted, so it is better to heat only the tip of the raw metal wire or rod. Conceivable. In this case, the magnetic field for suspending the metal and the magnetic field for heating the metal should be housed in a pressurizable container with a nozzle below and an opening/closing means between the melting part and the nozzle part. is desirable. By doing so, it is possible not only to seal the container and suppress gas consumption and evaporation of the metal after melting the raw materials, but also to use the pressure inside the container to blow out the molten metal. Further, secondary effects such as the ability to simply replace the nozzle even if the nozzle wears out can be expected. An example of the method according to the present invention will be explained below with reference to FIG.

In Fig. 3, 7 is a stainless steel melting and pressurizing container, which has a hole 71 in its bottom, a jacket 9 on the inside, and a quartz container with a small spout 81 on the outside. A nozzle 8 is removably attached.

A floating melting type heating furnace 10 is arranged above the hole 71, and this heating furnace 1 heats and melts the raw metal 4 charged through a charging section (not shown) while being restrained and suspended. It is now possible to do so.

Since a viewing window 72 is provided on the wall of the container 7, the state of the raw metal 4 in the heating furnace 10 can be seen from the outside. The container 7 also communicates with a gas pressure source via a valve 11 and a gas line 12, allowing the introduction of a high purity inert gas, for example argon gas of 1 to 5 k9/kg, thereby heating, This prevents oxidation of metal during melting and spouting. 6 is a copper roller as a cooling member located below the nozzle 8, for example, about 2
It has an outer diameter of 0.00 sail, is driven by a motor, and has a high speed such as 5000 to 600 to obtain a predetermined circumferential speed.
It is designed to be able to rotate at 0ypm.

Therefore, this roll 6 can cool the ejected molten metal at an ultra-high speed, for example, at a cooling rate of 1 p to 1 p C/sec, making it possible to obtain crystalline or amorphous metal filaments. I can do it.

If the cooling rate is slow and oxidation of the filament 42 is a problem, it is desirable to maintain an inert atmosphere around the roller 6. The roll 6 and the container 7 are configured to be movable relative to each other, and the distance between the surface of the roll 6 and the tip of the nozzle 8 can be set to a predetermined distance, for example, to a certain distance.

To explain the case where filaments of amorphous metal are manufactured using an apparatus having such a configuration, Cr, which has a high melting point, is mainly used.
amOQc (Cra is Cr at a %, Mb is Fe, N
One or more selected from i, Co, Mo, and Ta is b atomic %, Qc indicates that C is contained in c atomic %, and the sum of a, b, and c is substantially It is 100.

), C female N that easily reacts with heat-resistant materials such as quartz and alumina.
bbMc (Cua is a atomic % of Cu, Nbb is b
atomic %, Mc is one or both of Ti and Zr is C atomic %
The sum of a, b, and c is substantially 100. ) The case where an amorphous metal filament having the composition is obtained will be explained as an example. First, after closing the cover 9 of the container 7, the valve 11 is opened to introduce high purity argon gas of about 2.5 k9/kg into the container 7, and keep the inside of the container 7 in a pressurized state. In this state, the heating furnace 10'
The raw metal 4 to be produced is charged, the heating furnace 10 is negatively energized, a magnetic field for floating the raw metal 4, and a magnetic field for heating are applied, and the raw metal 4 is restrained and suspended. 1
Heat to 90,000℃ to dissolve. Next, when the raw metal 4 is melted, the sleeve 9 is opened, and the electromagnetic pressure acting on the molten metal is reduced or cut off.

By doing so, the molten metal 41 falls into the nozzle 8 below and is ejected from the ejection port 81 of the nozzle 8 in response to the gas pressure within the container 7 . Before opening the shirt sleeve 9, the lower roll 6 is driven and kept at a rotational speed of about 550 pm.

The metal 41 ejected from the nozzle 8 is cooled at an ultra-high speed by contacting the surface of the roll 6, and becomes a continuous amorphous filament 42. By this method, the inner diameter of the spout 81 of the quartz nozzle 8 is set to the 0.4 side, and the distance between the tip of the nozzle 8 and the surface of the roll 6 is set to the approximately 2 side.

When 5 g of raw materials for each metal having the composition shown in the following table were heated, each raw material metal 4 melted in about 1 S seconds and spouted out in 0.1 seconds, forming a shell with a thickness of about 25 mm and a width of about 1 rib. A filament 42 of uniform size was obtained. As a result of examining the obtained filament by X-ray diffraction, it was found that there were no sharp diffraction peaks and only a flowing halo was observed, indicating that the filament was amorphous.

Examples of the properties of each filament obtained are listed in the table below, and it was found that all of them were hard and had excellent thermal stability.

Tx: temperature at which the first exothermic peak begins in the differential calorimetry curve heated at 5°C/min.

Hv: Measured value using a micro Vickers hardness tester with a female load of 10.

As described above, in a method for directly obtaining a filament by a quenching method, the present invention separates the melting part of the raw metal from the nozzle part that spouts the melted metal, and the time during which the molten metal is in contact with the nozzle. This minimizes the nozzle's softening and clogging even when materials such as quartz are used in the nozzle, making it possible to prevent the nozzle from softening or clogging even when using materials such as quartz. It has the advantage that filaments can be easily obtained, and its practical value is extremely great.

The illustrated example shows a quenching method using a single roll, but even if it is a rolling quenching method using twin rolls as shown in FIG. A centrifugal quenching method using a cylindrical drum as shown in FIG. 1 or a belt quenching method as shown in d may be used.

When obtaining a filament with smooth surfaces on both sides, method a is preferably used.

Further, although the previous example does not mention preheating of the nozzle portion, there is no problem even if the nozzle portion is preheated to a temperature lower than the softening temperature of the nozzle constituent material.

By doing so, it is possible to prevent the molten metal from being cooled at the nozzle portion or from clogging at the nozzle portion due to viscosity or the like. In addition, the previous example showed the case where the container and the nozzle are blocked by a shield, but if there is little gas leakage from the spout or if gas pressure is added, the inside of the container may not be able to spout molten metal. If you can maintain the required pressure, you can omit the top cover.

[Brief explanation of the drawing]

Figures 1a and b are explanatory diagrams showing a conventionally known filament manufacturing method, Figures 2a, b, c, and d are diagrams showing other cooling methods, respectively, and Figures 3a and b are diagrams according to the present invention. It is an explanatory diagram showing an example of a method. 4: Raw metal, 41: Molten metal, 42: Filament 6
: cooling member, 7: container, 8: nozzle, 81: spout, 9
: Shirt Yu, 10: Floating melting type heating furnace. Figure 1 Figure 2 Figure 3

Claims (1)

[Claims] 1. A method for producing a filament in which molten metal is ejected from the spout of a nozzle using gas pressure and brought into contact with a moving cooling member to rapidly cool the filament, wherein the nozzle is provided at the lower end above the cooling member. A closed container equipped with an opening/closing means is provided between the nozzle portion and the inside, and the inside of the container is pressurized to heat and melt the raw metal in the container, and the molten metal is transferred there using a magnetic field. A method characterized in that the molten metal is suspended and restrained, and then the restraint is released and the opening/closing means is opened to cause the molten metal to fall into the nozzle and be ejected from the spout.