JP2001329306A - Alloy powder manufacturing apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an inexpensive alloy powder manufacturing apparatus which arranges the degree of flatness of the alloy powder and manufactures the flake-like powder with excellent yield at a low cost. SOLUTION: In this alloy powder manufacturing apparatus comprising a crucible 2, a heater 3 wound around the crucible, a twin roll 4, a flying space part A, a magnetic filter M and a return pipe C, the flying space part A has a structure with the space extended in the flying direction of the alloy powder, a blade part E for generating the swirl is installed on a part of the area, and a gas flow passage for circulating the inert gas in the flying direction of the alloy powder and a gas flow generating mechanism are added to the outside of the flying space part A.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an alloy powder manufacturing apparatus capable of efficiently manufacturing flake-like alloy powder.

[0002]

2. Description of the Related Art A conventional apparatus for producing an alloy powder will be described below.

[0003] In order to sinter the alloy powder at a high density of 99% or more by sintering at a low temperature using a hot press method or the like, it is necessary to use a flake-shaped metal powder having a large shape ratio. .

[0004] In the production of the flake-shaped synthetic powder, the molten alloy melted in the crucible is formed into droplets by ejecting the molten alloy from a melt ejection nozzle provided at a lower portion of the crucible.
There is known a method in which the liquid droplets collide with a rotary cooling body before solidification to rapidly solidify the liquid droplets in a flat shape. As the above-mentioned rotary cooling body, since the apparatus is simple, a single roll (or also referred to as a single roll) made of one metal roll having good thermal conductivity or a twin-roll alloy made of two rolls is used. Powder production equipment is commonly used.

[0005]

However, in the above-mentioned single-roll method, since the flatness of the obtained alloy powder cannot be controlled, the flake-like particles having a large variation and a mixture of irregular shaped powder particles are formed. There is a problem that it is difficult to obtain an alloy powder and the yield is poor.

In the twin-roll system, flat alloy powder is easily obtained as compared with the single-roll system.
Angles are widely distributed, and in a narrow space, deformation occurs due to collision with the wall, and a large space is required to accommodate the space without deformation.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide an inexpensive alloy powder producing apparatus capable of producing a flake-like powder in good yield at low cost with uniformity of alloy powder uniformity.

[0008]

In order to solve the above-mentioned problems, an apparatus for producing an alloy powder according to the present invention accommodates the entire production apparatus in an enclosed space filled with an inert gas or circulated. This chamber space is extended so as to protrude in the flying direction of the alloy powder to form a flow of an inert gas that guides the flying direction of the alloy powder after passing through the roll, which is convenient for the flying of the alloy powder. In the flight space where the alloy powder flies together with the inert gas, there is a swirling vane, which generates a strong downward swirling flow by the inert gas, and the alloy after the rolls collide is created. Reduces solidification of powder and makes the flight space compact.

A circulation system provided with a return pipe is provided so that the inert gas flow always flows in a direction for inducing the flake-like alloy powder. Since the flake-like alloy powder flies simultaneously in the inert gas flow, a filter for forcibly collecting the alloy powder is provided.

Here, by covering the entire apparatus of the alloy powder with an inert gas atmosphere, it becomes possible to handle the active metal, and the flow of the inert gas guides the alloy powder that has forcibly passed through the roll. The required space is compact, and the recovery rate of flat alloy powder is increased. In addition, expensive inert gas is recovered or circulated, which is advantageous in cost.

That is, the present invention relates to an apparatus for manufacturing an alloy powder comprising a crucible, a heater wound on the crucible, a twin roll, a flying space, a magnetic filter, and a return pipe. The space portion has a structure in which the space is extended in the flying direction of the alloy powder, and a blade portion for generating a swirling flow is provided in a partial region thereof, and outside the flying space portion, The present invention is an alloy powder manufacturing apparatus provided with a gas flow path for circulating an inert gas in a flying direction of the alloy powder and a gas flow generating mechanism.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An apparatus for producing an alloy powder according to an embodiment of the present invention will be described below.

FIG. 1 is a sectional view showing a schematic structure of an apparatus for producing an alloy powder according to the present invention. In the apparatus for manufacturing an alloy powder shown in FIG. 1, reference numeral 1 denotes a room space surrounding the entire apparatus. The crucible 2, the heater 3, and the twin rolls 4 are housed in this space, and the molten metal ejected from the nozzle 5 of the crucible 2 passes through the gap 6 between the twin rolls 4 and extends downward in the drawing. space
A is guided by the argon gas flow and reaches the flight space A. The flake-like alloy powder is guided to the tip without solidification by the swirling flow generated from the blade portion E. A magnetic filter M is set at the tip, and captures and collects the flake-like alloy powder flying to the tip, and forcibly circulates argon gas through a return pipe C for gas circulation.

In the above apparatus, when a blade device having a blade portion E is used and when it is not used,
An experiment was performed on the yield of the alloy powder. The experimental conditions were
It was as follows. Dissolved metal: Sendust, input amount to crucible: 1800
g, melting temperature: 1600 ° C., inert gas: Ar, inert gas pressure: 7 kgf / cm ² , material of rotary cooling body: copper, number of rotations: 3000 rpm, flow rate of molten metal: 25 g / s.

Table 1 shows the results of the above experiments.

[0016]

[Table 1]

From Table 1, it is apparent that the yield is improved when the blade device having the blade portion E is used.

[0018]

As described above, according to the present invention, it is possible to provide an inexpensive alloy powder producing apparatus capable of producing a flake-like powder with good flatness and good yield at low cost. it can.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a schematic structure of an apparatus for producing an alloy powder according to the present invention.

FIG. 2 is a cross-sectional view of a swirl flow generating blade portion in the alloy powder manufacturing apparatus according to the present invention.

[Explanation of symbols]

 Reference Signs List 1 room space (filled with inert gas) 2 crucible 3 heater 4 twin roll 5 nozzle 6 gap (between rolls) M magnetic filter A flight space part C return pipe D arrow indicating gas flow E blade part for generating swirling flow

Claims (1)

[Claims] 1. An apparatus for manufacturing an alloy powder comprising a crucible, a heater wound around the crucible, a twin roll, a flying space, a magnetic filter, and a return pipe, wherein the flying space comprises: It has a structure in which the space extends in the flight direction of the alloy powder, and a blade portion for generating a swirling flow is installed in a part of the space, and an inert gas is supplied outside the flight space portion. An apparatus for producing an alloy powder, comprising a gas flow path for circulating the alloy powder in a flight direction and a gas flow generating mechanism.