JPS5929928Y2 - Metal particle manufacturing equipment - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to improvements in metal particle manufacturing equipment.

As a conventional metal particle manufacturing apparatus, an apparatus is known in which molten metal is dropped onto a disk rotating at high speed in a closed chamber and is dispersed by centrifugal force.

However, with this apparatus, the shape of the metal powder obtained is flakes or has irregular corners, and there is a drawback that spherical metal particles cannot be obtained.

In addition, a metal rod is rotated in a sealed chamber,
There is also known an apparatus in which the tip of the metal rod is melted by arc or plasma and the molten metal is scattered by centrifugal force.

However, with this device, the shape of the metal particles obtained,
In order to obtain products having a wide size range and a desired size and uniform shape, it is necessary to perform sieving, etc., and the yield is also low.

The present invention aims to improve these conventional drawbacks and provide an apparatus that can easily produce metal particles with uniform grain shape and size.

The apparatus of the present invention will be explained based on the drawings.

FIG. 1 shows a longitudinal section of the device according to the invention.

In the figure, 1 is an inert gas introduction pipe, 2 is a closed chamber, and 3
is a metal melting crucible, 4 is a tundish for dropping molten metal, 5 is a high-speed rotating device, 6 is a conical shape, 7 is a metal particle,
8 is a metal rod.

9 in FIG. 2 is a V-shaped high speed rotating body.

A metal rod 8 is melted in a metal melting crucible 3 and sent to a tundish 4, and the molten metal is dropped into a conical mold 6.

The conical mold 6 is rotated at high speed by a high-speed rotation device 5, and the dropped molten metal is scattered by centrifugal force and solidified in an inert gas atmosphere to form metal particles 1.

The metal melting/dropping device is not limited to what is shown in the drawings and can be modified as desired.

Also, depending on the type of metal, the sealed chamber and introduction of an inert gas are not necessarily required.

It is preferable that the rotation of the conical mold 6 is usually 2,000 to 40,000 revolutions per minute.

The scattering state of the molten metal varies depending on the molten physical properties of the metal, the material of the cone shape, the angle of the cone, the rotation speed, etc., and by appropriately combining these factors, it is possible to form spherical objects with uniform particle size.

Since the material of the conical shape has a relationship with the physical properties of the molten metal, especially the wettability, a fire-resistant material such as graphite, alumina, or magnesia is preferable.

The angle of the conical or V-shape is 15 to 75 with respect to the center line.
Preferably, it is within a range of degrees.

If it is smaller than 15 degrees, it is difficult to obtain spherical metal particles;
If it exceeds 5 degrees, scattering becomes poor and the particle size of the particles becomes uneven.

Further, the peripheral edge of the conical or V-shape must have no horizontal surface and be linear along the inclined surface.

If there is a horizontal surface at the periphery, the shape of the obtained metal powder will be a mixture of flakes or particles with irregular corners, making it impossible to obtain uniform spherical particles, and the periphery will be straight along the inclined surface. If the shape is irregular, for example, wavy, the molten metal that has entered the recess will be scattered all at once, resulting in a spherical shape.

According to the device of the present invention, since the plate on which the molten metal is dropped is conical, the droplets are dispersed uniformly, the shape of the metal particles obtained is spherical, and it is easy to obtain particles of uniform particle size. have

Further, similar effects can be obtained when the high-speed rotating body is shaped into a V-shape as shown in FIG.

In the apparatus shown in the drawing, arcon gas was flowed at 0.17 per minute into a sealed chamber with an inner diameter of 430 mm, and copper was melted at an arc voltage of 20 cm and a current of 400 amperes using an arc electrode and a refractory crucible provided in the chamber, and was then turned into a tundish. I poured hot water.

A drip hole with a diameter of 4WL and 11L was provided at the bottom of the tundish, and the liquid was dripped into a conical shape (45 degrees) located 501 ftm below the drip hole.

When the conical shape was rotated at a rotation speed of 30,000 revolutions per minute, spherical copper particles having a particle size of 100 to 300 mesh were obtained.

Further, when NiTi alloy particles were produced at a rotational speed of 40,000 revolutions, fine particles of 400 meshes or more were obtained.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional view showing one embodiment of the metal particle manufacturing apparatus of the present invention. FIG. 2 is a longitudinal sectional view in which a V-shape 9 is used in place of the conical shape 6 of FIG. 1: Inert gas introduction pipe, 2: Closed chamber 3: Metal melting crucible, 4: Tandish, 5: High speed rotation device, 6
: conical shape, γ: metal particle, 8: metal rod, 9: V-shape.

Claims (1)

[Scope of utility model registration request] In an apparatus for manufacturing metal particles by dispersing molten metal against a high-speed rotating body in a chamber, the high-speed rotating body has a conical or V-shaped shape, and the angle of the shape is 15 to 70 degrees with respect to the central axis. An apparatus for producing metal particles, characterized in that the peripheral edge of the mold has no horizontal surface and is linear along an inclined surface.