JPS6159813B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention relates to a method for manufacturing a rapidly solidified material, and particularly aims to provide a manufacturing method suitable for mass production of rapidly solidified materials. In recent years, with the development of ultra-rapid cooling methods with cooling rates of 10 ² °C/sec to ^{10 8} °C/sec, it has become possible to create fibrous or ribbon-like materials such as amorphous alloys, sendust, and dielectric materials. I'm getting used to it. In this application, a material obtained by rapid solidification at a rate of at least 10 ² °C/sec or more is referred to as a rapidly solidified material. First, a conventional manufacturing apparatus will be explained using FIG. 1. In the figure, 1 is a crucible whose lower part is open and serves as a nozzle, and is attached to an arm 3 of a lifting device 2. The crucible 1 is configured so that material can be input from above, and the melt 4 in the crucible 1 can be pressurized with gas and ejected from its nozzle. 5 is a heating furnace, crucible 1
It is used to heat the material put inside and keep it melted. An inert gas introduction pipe 6 is arranged in the heating furnace 5 so that an inert atmosphere is created around the crucible 1. In such an apparatus, raw materials are introduced into the crucible 1 from above in the state shown in the figure, heated in the heating furnace 5, and melted. Once the molten material 4 is obtained, the elevating device 2 is lowered to approach the side surface of the cooling roller 7 rotating at high speed, as shown by the broken line, and the molten material 4 is ejected from the nozzle of the crucible 1. The material deposited on the roller 7 is rapidly cooled and the desired material is obtained. Note that 8 is a heat shielding plate for shielding the lifting device 2 from heat from the heating furnace 5 and the like. When using the above-mentioned apparatus, when attempting to produce a wide rapidly solidified ribbon, a nozzle with a diameter at least equal to or larger than the width of the ribbon is required, which increases the size of the crucible. Along with this, heating furnaces have also become larger,
It is inevitable that the equipment itself will become significantly larger. Not only that, but if you are trying to manufacture a ribbon-shaped material with a width of about 10 cm, for example, as the manufacturing equipment becomes larger, it becomes impossible to ignore heat radiation. The secondary problem of shielding occurs, creating technical difficulties that cannot be solved by mere scale-up. With the melting method using a high-frequency coil, not only can some materials be melted and others not, but the temperature cannot be maintained constant unless the raw material is in the crucible, making it possible to stably produce materials. It is not suitable for such mass production. Furthermore, the equipment becomes more expensive. Furthermore, in a device that moves the crucible vertically, the raw material must be dropped into the crucible and loaded.
There is a problem in the manufacturing process that the raw material must be finely ground in advance to avoid damaging the crucible. The present invention solves the above problems by moving the crucible horizontally and rotating it at a predetermined position in a direction perpendicular to the direction of movement. This is a manufacturing method suitable for mass-producing the material. Hereinafter, one embodiment will be described in detail using FIG. 2. Figure A shows the state when the raw material is melted, and Figure B shows the state when the molten material is ejected. In the figure, reference numeral 11 denotes a crucible that serves both as a melt reservoir and an ejection nozzle, which has a melt ejection port on its side surface and is supported horizontally by a horizontal drive section 12. Reference numeral 13 denotes a raw material loading section, which is opened and materials are loaded into the crucible 11 from here.
14 is a gas supply unit that supplies inert gas at a predetermined pressure into the crucible 11. 15 is a heating furnace, and 16 is a cooling medium. As the cooling medium 16, a rotating roller, a pair of rolling rollers, a flat disc-shaped turntable, or the like can be used. Here, a rotating roller is shown as an example. In the apparatus having the above configuration, first, as shown in FIG. 2a, the crucible 11 is placed in the heating furnace 15. At this time, the melt spout of the crucible 11 is directed upward. In this state, the raw material loaded into the crucible 11 from the raw material loading section 13 is melted,
Let it be a melt 17. Inert gas is constantly supplied into the crucible 11 from the gas supply section 14, and the inert gas flows out from the melt spout of the crucible 11, so the inside of the crucible 11 is always maintained in an inert atmosphere. . When the raw material is sufficiently melted, the horizontal drive unit 12
As shown in FIG. 2b, the crucible 11 is moved horizontally to the outside of the heating furnace 15, and then rotated so that the molten material spout faces downward, and the molten material spout is directed to the rotating roller 16. Let them face each other. When they meet, a constant gas pressure is applied to the melt 17 to overcome its surface tension and blow the melt 17 from the crucible 11 onto the rotating roller 16. The molten material sprayed onto the rotating roller 16 is rapidly cooled to obtain the desired rapidly solidified material. When the ejection of the melt is completed, the crucible 11 is returned to the initial state shown in FIG. 2a, the raw material is loaded into the crucible 11 again, and the above-described operation is repeated. In the above manufacturing method, the crucible is arranged horizontally and is configured to move horizontally, so the supporting part of the crucible is heated relative to the heating furnace, as in the conventional apparatus shown in Fig. 1. There is also no need to completely shield the area. That is, since there is virtually no risk that the horizontal drive unit 12 for supporting and moving the crucible 11 will be exposed to high-temperature airflow generated by the heating furnace 15, etc., the heat shielding is not required with conventional equipment. It is very easy to do compared to. Since the melt spout is provided on the side of the crucible 11, its size
Restrictions on shape etc. are greatly relaxed compared to conventional devices provided at the bottom of the crucible. for example,
It is also easy to form the spout in a slit shape in a direction parallel to the horizontal direction, and for that purpose, the crucible 1
There is no need to make the heating furnace 1 or the heating furnace 15 particularly large. That is, it is easy to produce a wide rapidly solidified material using a small device. By the way, the table below shows the size of the device and the required power when producing a ribbon-like rapidly solidified material with a width of 8 cm using the device with the configuration shown in Figure 1 and the above example. It is.

[Table] By arranging the crucible 11 to move horizontally, it becomes easier to remove deposits from the melt spout, and since the heating furnace 15 is horizontal, it is possible to observe the inside of the furnace. The temperature can be easily measured using a thermometer or an optical thermometer, and the raw material can be loaded horizontally into the crucible 11, so the raw material only needs to be rod-shaped, and unlike conventional equipment, the raw material cannot be crushed in advance. This has the advantage that there is no need to store it. Furthermore, since the crucible 11 is configured to be rotatable around its moving direction, its spout can be directed upward except when spouting the melt.
There is less damage and deterioration of the crucible 11 due to reaction with the melt 17 at the melt spout portion. If the molten material 17 is made of iron or the like as its main raw material and is easily oxidized, when it is melted, it will flow from the gas supply section 14 into the crucible 11 and further from the molten material spout to the outside. By flowing the active gas, contact between the melt 17 and air can be easily blocked. Therefore, not only is there no need for a device for creating a simple atmosphere around the nozzle as in conventional devices, but the amount of inert gas consumed can also be reduced. Of course, if the raw material is not likely to oxidize and is inert to the crucible 11, the crucible 1
There is no need to rotate the crucible 1, and the melt spout of the crucible 11 is directed downward from the beginning, and the melt is held within the crucible 11 using the surface tension of the melt. When necessary, it can also be sprayed onto the surface of a high-speed rotating cooling body. As explained above, since the manufacturing method according to the present invention is configured to move the melt spouting part in the horizontal direction, there are virtually no restrictions on the shape or size of the melt spout, and the width can be increased. A wide range of rapidly solidified materials can be easily produced. Moreover, there is no need to particularly enlarge the device for this purpose. When melting raw materials that are easily oxidized, the molten material can be prevented by directing the molten material spout upward, supplying inert gas into the molten material spouting part, and allowing it to flow out from the molten material spout. It can prevent contact with air and prevent its oxidation. Therefore, a device for creating a simple atmosphere around the ejection port is not required. Furthermore, by configuring the melt spouting portion with a crucible, the driving device is not exposed to the heat flow from the heating furnace, and measures such as heat shielding become extremely simple.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing the structure of a conventional rapid solidification material manufacturing apparatus. FIG. 2a shows the configuration of an apparatus using the method for producing a rapidly solidified material according to the present invention when the raw material is melted, and FIG. 2b shows the configuration when the melt is ejected. DESCRIPTION OF SYMBOLS 11... Crucible, 12... Horizontal drive part, 13... Raw material charging part, 14... Gas supply part, 15... Heating furnace, 16
... Rotating roller (cooling medium), 17... Molten body.

Claims (1)

[Scope of Claims] 1. A molten material spouting part is supported by a drive device for horizontally moving between a raw material melting position and a molten material spouting position, and at the melting spouting position, the molten material is A method for producing a rapidly solidified material, comprising: ejecting a molten material downward from a spout and spraying it onto a cooling body. 2 The drive device holds the melt spouting part so that the melt spout faces upward at the raw material melting position, horizontally moves it to the melt spouting position, and then directs the melt spout downward to melt the raw material. A method for producing a rapidly solidified material according to claim 1, characterized in that the material is ejected. 3. Production of the rapidly solidified material according to claim 2, characterized in that when the raw material is melted, an inert gas is flowed out from the melt spout of the melt spouting part to prevent oxidation of the melt. Law. 4. The melt spouting part is configured by a crucible having a melt spouting port on the side surface, and when the raw material is melted, the crucible is positioned in the heating furnace by a drive device, and when the melt is spouted, it is moved from the heating furnace to the outside. The method for producing a rapidly solidified material according to claim 1, 2, or 3, characterized in that the molten material is ejected onto the cooling body by moving the material horizontally. 5. The method for producing a rapidly solidified material according to claim 4, characterized in that a crucible having a loading port capable of horizontally loading raw materials is used.