CN2361412Y

CN2361412Y - Equipment for making metallic powder using centrifugation

Info

Publication number: CN2361412Y
Application number: CN 99203164
Authority: CN
Inventors: 袁富昌; 袁野
Original assignee: Individual
Current assignee: Individual
Priority date: 1999-02-02
Filing date: 1999-02-02
Publication date: 2000-02-02
Anticipated expiration: 2009-02-02

Abstract

The utility model relates to equipment for making metallic powder by using centrifugation, which uses the melting or the saturated liquid to produce the powder. The equipment solves the technical problem that the particle size and the shape of the produced powder are uniform and controllable. The equipment for making metallic powder by using centrifugation is composed of an upward opening, a container, the wall of which is provided with small holes, and a driving machine which drives the container to rotate. The liquid is led into the rotating container from the upper part, is permeated into drips through the small holes under the action of the centrifugal force, is gradually disengaged from the container, flies and then is solidified into powder in the cooling medium. The particle size of the powder is controlled by the external diameter and the rotary speed of the container. The shape of the powder is controlled by the cross section of the small holes on the wall of the container and the temperature difference or the solvent concentration difference between the liquid and the cooling medium.

Description

Centrifugal process is produced the equipment of powder

The utility model relates to a kind of equipment that adopts centrifugal process to produce powder.Produce granularity and the homogeneity of shape and the technical problem of Modulatory character difference of the equipment powder that ubiquity produces of powder at present.The purpose of this utility model provides a kind of equipment, just can change the granularity and the shape of the powder that produces by transposing element of installation and equipment service condition, but the parameter of permanent plant member and service condition is with regard to the powder of output granularity and shape homogeneous.

The purpose of this utility model is achieved in that by foraminate container on the wall and the driving machine that makes the container rotation, constitutes equipment of the present utility model.The liquid of the fusion that conduit can solidify because of cooling during use or can inject the container that is rotating because of the saturated liquid that the solvent evaporation is solidified, liquid can ooze out by aperture under centrifugal action, forms drop outside chamber wall.Drop is made garden Zhou Yundong with the container rotation.

The volume of drop and quality are owing to the fluid column in the aperture continues to carry and constantly grow up.Under centrifugal action, grow up when the surface tension of its suffered centrifugal force and aperture fluid column and viscous force sum equate, just begin to break away from gradually the process of container when drop.In the process that breaks away from and in the process of in cooling medium, flying after breaking away from, be frozen into powder.

Because the granularity of powder is by the volume decision of drop, and the volume of drop when breaking away from container is decided by its external diameter and rotating speed, meets relationship:

V＝f/ρ.ω ²(r+l)

In the formula: V is the volume of drop

F be liquid the surface tension at aperture place and viscous force and

ρ is a fluid density

ω is the rotational angular velocity of container

R is the outer radius of container

L is the center of gravity of drop and the distance between container outer wall

Again because fix at little hole area, under liquid temperature is fixing, the cooling medium condition is fixed the equipment service condition, the f in the formula, ρ, l are constant constants, so the volume of drop is corresponding with the outer radius r and the rotational speed omega thereof of container.Owing to adopt technique scheme, the outer radius r of container and rotational speed omega thereof just can realize the Modulatory character of the powder size of producing in the transposing equipment like this; The fixing homogeneity that just can realize the powder size of producing.

Begin to break away from the process of container at drop, the aperture fluid column that connects drop produces one gradually by the centrifugal force drawing-down under its surface tension effects, finally the process of being broken.In the moment that fluid column is broken, the two ends of gap all are most advanced and sophisticated.Use equipment of the present utility model, control the speed that drop solidifies because of cooling for the liquid of fusion by the temperature difference of adjusting between itself and cooling medium, control the speed that drop solidifies because of the solvent evaporation by the solvent strength difference of adjusting between itself and cooling medium for saturated solution.When setting rate was fast, all solidified very soon at two tips of gap, all is pointed powder with regard to the output two ends; When setting rate was slow, did not solidify at two tips of gap, and noncondensing tip retracts into sphere under capillary effect, all be the powder of sphere with regard to the output two ends; When setting rate is moderate, obtain the diffusion supply of solvent in the heat conduction of fluid column or the fluid column at the tip of chamber wall one side, can not solidify, just retract into sphere.And the other end is frozen into the tip because of not possessing above-mentioned heat conduction and the diffuse source medium that just is cooled, so be sphere shape with regard to output one end, the other end is pointed tear drop shape powder.

In addition, the sectional area of aperture on the transposing chamber wall, when it was increased, the aperture fluid column was thick, and the drift angle at two tips of gap is blunt, with regard to the powder of output stubby shape; When it was reduced, the aperture fluid column was thin, and the drift angle at two tips of gap is sharp, with regard to the longilineal powder of output.

Like this, owing to adopt technique scheme, the aperture sectional area on the chamber wall and the temperature difference between liquid and cooling medium or solvent strength difference are done transposing adjustment, just can realize the Modulatory character of the powder shape that produces.Fix, just can realize the homogeneity of the powder shape that produces.

Fig. 1, be device structure and the user mode schematic diagram that among the utility model embodiment driving machine is arranged on the top, floor.

Fig. 2, be device structure and the user mode schematic diagram that among the utility model embodiment driving machine is arranged on the below, floor.

In Fig. 1 and Fig. 2:

1, driving machine 2, floor 3, liquid 4, aperture 5, container

6, drop 7, cooling medium 8, receipts powder bucket 9, powder-product

In Fig. 1 and two embodiment of Fig. 2,, all be that to drive that container (5) does with the plumb line be rotatablely moving of axle no matter driving machine (1) is arranged on the top or the below on floor (2).The opening of container (5) is made progress.All fusion or saturated liquid (3) is injected in the container (5) that has aperture (4) on the wall by the top.Like this, under centrifugal action, liquid (3) oozes out through aperture (4), forms drop (6) on the outer wall of container (5).When the volume of drop (6) is grown up when its suffered centrifugal force and aperture (4) are located to be connected the surface tension of fluid column of drop (6) and viscous force sum and equated the process that just begins to break away from container (5).Drop (6) breaks away from container (5) back and flies along the level throw motion track in cooling medium (7).In the process that breaks away from and fly, be frozen into powder.Powder is received powder bucket (8) and is gathered into powder-product (9).The function of two its equipment of embodiment illustrated in figures 1 and 2 is identical with effect, all is to realize best way of the present utility model.All be external diameter by transposing container (5) and rotating speed realize the Modulatory character and the homogeneity of granularity of the powder that produces (9).Can both pass through the sectional area of the aperture (4) on the container (5) and the temperature difference between liquid (3) and the cooling medium (7) or solvent strength difference realize institute's powder that produces (9) shape Modulatory character with spare a property.

Fig. 3 is the corresponding relation figure that changes device parameter and the service condition and the powder shape that produces in embodiment illustrated in figures 1 and 2.Its device parameter scope is aperture sectional area≤3mm ², container overall diameter≤160mm, the rotating speed 〉=1400min of container ^-1

Claims

A kind of centrifugal process is produced the equipment of powder, is made of foraminate container on the wall and the driving machine that makes the container rotation.Vessel port is the axle rotation with the plumb line upwards, it is characterized in that: be made of container and the driving machine that makes the container rotation, aperture is arranged on the chamber wall, vessel port is the axle rotation with the plumb line upwards.