JPS5827902A - Method and device for treating metallic powder - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] This invention is directed to Or obtained by an oil atomization method.

Continuously and efficiently deoil and decarburize lubricated metal powders or alloy powders containing one or more easily oxidizable elements with low free energy and low free energy. Water atomization, gas atomization, and oil atomization are known as well-processed methods and metal powder production methods. - The metal powder produced during water distribution atomization is easily oxidized by the water of the spray medium, and it is desirable that the content of oxygen is low in terms of its composition and the compressibility, formability, and sinterability of the metal powder. In rare cases, the resulting metal powder was heated at 1000"C for 3
The reduction treatment must be carried out at a high temperature and for a long time of up to 5 hours, and even in this treatment, there is a problem in that the oxygen content can only be reduced to Q, 2wl, % at most.

In addition, the gas atomization method is I! N2 as a Jt fog medium,
This method uses so-called inert gas such as Ar to produce metal powder, and the inert gas required in large quantities is expensive, and the resulting product has a spherical particle shape.
Problems arose when the sinterability was poor.

In addition, the oil atomization method is a method for producing metal powder using oil as a spray medium, and the water atomization method (51!:
It is superior in that there is no oxidation (low oxygen content) in the metal powder obtained (low oxygen content), but oil as a first prize atomizing medium adheres to the metal powder immediately after oil atomization. In addition, since it is carburized during atomization, it must be decarburized in order to be used as a raw material for low-carbon applications. Processing is continuous.

Moreover, an efficient processing method and processing device have not yet been found.

The present invention provides a method for obtaining a metal powder or alloy powder containing one or more easily oxidizable elements such as (4, Mn, V, Nb, B, Si, etc.) using oil atomization to reduce its oxygen content. It is therefore necessary to provide a method and apparatus for manufacturing metal powder by a method and continuously deoiling and decarburizing lubricating oil and carburized metal powder while suppressing oxidation of the metal powder.

The feature of this invention method is that a lubricated metal powder containing one or more oxidizable elements obtained by an oil atomization method is supplied onto a moving bed (page 4) as a powder or in the form of a lump. The metal powder was heated to 100°C or higher in a primary heating process using a non-oxidizing gas surrounding atmosphere, and then heated to 550-1200°C in a secondary heating process using a decarburizing gas surrounding air. and then cooled in a cooling process that created a non-oxidizing gas atmosphere, further separating oil mixed in the gas discharged from the C-deficient heat process as necessary, and removing it from the secondary heating process. It is a method for removing decarburization reaction inhibiting components mixed into the discharged IJ (I! carbonaceous gas).The device also consists of a moving bed that is equipped with wheels at both ends and moves endlessly, and a moving bed that is equipped with wheels at both ends. A supply device for supplying metal powder above the upstream side, a primary heating chamber connected to a non-oxidizing gas supply system downstream of the supply device, and a decarburizing chamber installed downstream of the heat depletion chamber. A secondary heating chamber connected to the gas supply system, a cooling chamber connected to the non-oxidizing gas supply system installed downstream of the secondary heating chamber, and, if necessary, a heat-deficient chamber. The non-oxidizing gas supply system connected to the secondary heating chamber is a non-oxidizing gas circulation system [2. The circulation system is equipped with an oil separator. The system is a decarburizing gas circulation system, the circulation system is equipped with a gas component regulator, and the sub-heating chamber is divided into an oil removal chamber and a heating chamber;
Alternatively, it is an apparatus in which a gas outlet wall having a hollow structure is provided at the boundary between the primary heating chamber and the secondary heating chamber to prevent gas from one chamber from entering the other chamber.

This invention will be explained in detail below.

The inventors adopted a moving bed after various studies on methods for continuously and efficiently deoiling and decarburizing.

By adopting a moving bed, the carbon content is higher than the upstream side of the moving bed, and when a predetermined amount of lubricated metal powder is continuously supplied, the treated metal powder can be efficiently recovered from the downstream side. becomes possible. This moving floor has holes on both ends.
A method is adopted in which the eel is installed and driven to the end knife.

The lubricated carbon-containing high-H metal powder supplied upstream of the moving bed enters a -deheating step as the moving bed moves. The purpose of this heat-deficient step is to remove oil, and in order to prevent the metal powder from oxidizing, non-oxidizing gases such as inert gases such as N2 and Ar, reducing gases such as H2 and Co, or mixed gases thereof are used. The metal powder is heated to a temperature of 100°C or higher. This heating vaporizes and removes the particles attached to the metal powder.
The above-mentioned temperature range of 100°C or more is the most efficient range for vaporizing oil. In other words, the conditions for vaporizing oil are a temperature range from the boiling point of the oil to several tens of degrees C higher than the boiling point at most, and the boiling point of oil in the oil atomization method is approximately 100 degrees Celsius at the lower limit, and 100 degrees Celsius is the lower limit. Efficient deoiling is difficult at ambient temperatures below. Therefore, the temperature range of the primary heating step necessary for deoiling in this invention is set to 100°C or higher.

Moreover, the gas atmosphere is a non-oxidizing gas atmosphere.

Of course, oxidation of metal powder can be prevented, and there is no need to worry about ignition of attached oil.

Next, as the moving bed moves, a secondary heating step begins. This secondary heating step is a decarburization step, in which a mixture of H2 or H20, L (, CO2, CO mixed gas, or a mixture of these and an inert (page 7) gas such as N2) is used. It is a carbonaceous gas atmosphere, and the atmospheric temperature is 550 to 1200°C.

In this decarburization process, the ambient temperature is important, and the temperature range for the most efficient decarburization was determined.

In other words, at temperatures below 550°C, the diffusion of carbon in the metal powder is weak and decarburization does not proceed even in a decarburizing atmosphere, and at ambient temperatures above 1200°C, the higher the temperature, the more the powder becomes This is because mutual adhesion occurs, making it difficult to crush the adhering powder, and reducing the proportion of fine powder present as a raw material metal powder for powder metallurgy, etc., which is undesirable. Therefore, in the present invention, this secondary heating step is performed at 550 to 1
The temperature range was 200°C.

Next, the decarburized metal powder enters a cooling process. The cooling process is for cooling the high-temperature metal powder used in the decarburization process, and a non-oxidizing gas atmosphere is used to prevent the metal powder from oxidizing. The non-oxidizing gas atmosphere in this cooling step may be the same as the non-oxidizing gas atmosphere in the -depletion heat step.

Additionally, - the non-oxidizing (8th
Page) Since the gas is used for deoiling the lubricated metal powder, only vaporized oil is mixed in. C, which is included in this invention, can be used to remove oil mixed in this gas as necessary. It can be easily separated and recovered as oil by cooling and applying it to a mist separator, and the non-oxidizing gas after oil removal is recycled and used again. The recovered oil can also be reused as a spray medium during atomization.

Furthermore, in the present invention, the decarburizing gas is recycled and used while removing the decarburizing reaction inhibiting components mixed in the decarburizing gas as necessary. The decarburizing gas discharged through the decarburizing process contains zero carbon contained in the metal powder.
If this decarburizing gas is mixed as a component of 0 or CH4 and recycled, the concentration of 00 or OH in the gas will increase, and the decarburization reaction will be inhibited. When using the decarburizing gas in circulation, a large amount of CO or OH is removed to bring the concentration of CQ or OH in the gas to a predetermined value. When using a decarburizing gas containing oxidizing gases such as The atmospheric pressure in the thermal process and cooling process is set higher than the atmospheric pressure in the decarburization process (secondary heating process) to prevent decarburizing gas from flowing into the primary heating process and cooling process, It is necessary to prevent oxidation of metal powder during thermal and cooling processes.

Furthermore, if you want to avoid the vaporized oil generated in the -de-heating process from entering the secondary heating chamber and impeding the decarburization efficiency in the secondary heating process, - It is necessary to divide the heating chamber into heating chambers and keep the atmospheric pressure in the heating chamber higher than the atmospheric pressure in the deoiling chamber to prevent vaporized oil from entering the secondary heating chamber.

In addition, even without creating a pressure difference between the atmospheres of the secondary heating chamber and the secondary heating chamber, a hollow structure gas outflow wall is provided at the boundary between the two chambers, so that the gas in both chambers is constantly forced through this wall. By allowing the gas to flow out through the chamber, it is possible to prevent the gas in the compartment from entering from one chamber to the other.

Next, an embodiment of the apparatus of the present invention will be described. FIG. 1 shows a longitudinal sectional side view of an embodiment in which a gas containing f(20 or CO) is used as the decarburizing gas.

In this figure, wheels (]-1) are installed on both ends,
The wheels (1, -1) are rotated by a separately provided drive device such as a seven-wheel drive unit. This rotating wheel (1-1) has an endless wheel (1-2)
are engaged to form a moving bed (1). bell)
(1-2) may be plate-shaped, mesh-shaped, or caterpillar-shaped.

The moving bed (1) moves in the direction of the arrow, and the moving bed (1) moves in the direction of the arrow.
Above the upstream side of 1), there is a supply hopper (1) for supplying the lubricated metal powder to be treated to the moving bed (1).
2). The supply hopper (2) always cuts out powder at a constant rate from its lower part.

(Page 11) On the downstream side of the supply hopper (2), there are a deoiling chamber (4) which is a divided secondary heating chamber, a heating chamber (5), and a secondary heating chamber (6).
) and a cooling chamber (7) are arranged in this order.

In addition, the oil removal chamber (4), heating chamber (5), secondary heating chamber (
6) each has a heater (
2), the deoiling chamber (4) heats the metal powder to a temperature of 100°C or higher necessary for deoiling, and the secondary heating chamber (6) heats the metal powder to a temperature of 550 to 1200°C necessary for decarburization. The heating chamber (5) raises the temperature to eliminate the temperature difference between the temperature of the deoiling chamber (4) and the secondary heating chamber (6), and also increases the temperature of the gas in the deoiling chamber and the secondary heating chamber. This prevents mixing.

Furthermore, a cooling chamber (7) provided downstream of the secondary heating chamber (6)
) is designed to cool the high-temperature metal powder that has been deoiled and decarburized to about room temperature without oxidizing it. The cooled metal powder is taken out from the end of the moving bed (1).

The deoiling chamber (4), warming chamber (5), and cooling chamber (7) are connected to a non-oxidizing gas supply system (8), and this secondary heating chamber (
6) is connected to the decarburizing gas supply system (9). The non-oxidizing gas supply system (8) supplies the non-oxidizing gas to the deoiling chamber (
4) (Page 12) The non-oxidizing gas supplied to the ball flow side and the heating chamber (5), and the non-oxidizing gas supplied to the deoiling chamber (4) and the warming chamber (5), is supplied to the deoiling chamber (4).
The oil is discharged from the downstream side of the cooling chamber (7), is supplied from the downstream side, and is discharged from the downstream side to be supplied to the upstream side of the deoiling chamber (4). In addition, this non-oxidizing gas supply system (8) is connected to a dust collector (
8-1), an oil separator 01, and a blower (8-2) are sequentially arranged to constitute a circulating system. The dust collector (8-1) in this circulation system is for collecting fine metal powder mixed in the non-oxidizing gas discharged from the deoiling chamber (4), and the oil separator α1 is Cooler(
10-2) and a mist separator (10-1), it cools the high-temperature non-oxidizing gas discharged from the deoiling chamber (4), lowers the mist-formed oil to below its dew point, and removes the oil. At the same time, the collected oil that did not discolor was sufficiently removed by the next mist separator (10-1). After the non-oxidizing gas is treated in this manner, it is circulated again by the blower (8-2). Note that (8-3) in this system is a non-oxidizing gas replenishment system that makes up for the lack of non-oxidizing gas,
(8-4), (8-5), (8-6), (8-7) are
Each shows a valve that adjusts the flow rate of the gas. The decarburizing gas supply system (9) is connected to supply decarburizing gas from the downstream side of the secondary heating chamber (6) and discharge the gas from the upstream side of the heating chamber (6). , a dust collector (9-1), a gas component regulator a℃, and a blower (9-1) from the gas discharge side.
-2) are arranged in sequence to form a circulating system. The dust collector (9-1) is for collecting fine metal powder mixed into the decarburizing gas discharged from the secondary heating chamber (6), and the gas component regulator αD is The purpose is to remove and adjust the 00 component in the decarburizing gas that increases during decarburizing of metal powder, and to maintain the decarburizing property of the decarburizing gas at a high level.

That is, a large number of CO acid components in the decarburizing gas discharged from the secondary heating chamber (6) are first transformed into CO2 in the gas component regulator 0), and then come into contact with the CO□ absorbent. Therefore, the gas that has passed through the gas component regulator α° C. becomes low enough not to inhibit the CO acid component decarburization reaction, and can be used again as a decarburizing gas. Note 5: CO content is checked and managed based on CO concentration. Furthermore, this decarburizing gas supply system (9) is provided with pulp (9-4) in front of the dust collector (9-1), and the amount of exhaust gas from the secondary heating chamber (6) is adjusted. Gas is supplied and circulated to the secondary heating chamber (6) by a blower (9-2) behind the component regulator α°C. Note that (9-3) is a decarburizing gas replenishment system, which is used to replenish decarburizing gas when the decarburizing gas is insufficient.

In the non-oxidizing gas supply system (8) and the decarburizing gas supply system (9) as described above, the decarburizing gas may be one with a composition of H2O, H2 or one with a composition of CO□,00, etc.
, O, and Co2, prevent the gas from flowing from the secondary heating chamber (6) into the cooling chamber (7) and heating chamber (5) to prevent oxidation of the metal powder before and after decarburization. In order to prevent this, it is necessary to set the indoor pressure of the cooling room (7) and heating room (5) higher than the indoor pressure of the secondary heating room (6).

In addition, the indoor pressure for temperature rise* (5) needs to be higher than the indoor pressure for the deoiling chamber (4), and the indoor pressure for
(Page 5) When the pressure becomes lower than the indoor pressure of the oil removal chamber (4), oil-containing gas flows into the secondary heating chamber (6), and the metal powder in the secondary heating chamber (6) is heated. Decarburization performance will be reduced. Based on the above, new pressure gauges were installed in each chamber to maintain the appropriate pressure in each chamber.
It is preferable to adopt a configuration that allows the pressure to be adjusted.

FIG. 2 shows another embodiment of the invention.

In Fig. 2, a deoiling chamber (4), a heating chamber (5), a secondary heating chamber (6), and a cooling chamber (7) are arranged in order on the downstream side of the supply hot spring 4-(2). . De-oiling room (4), warming room (
5) Each of the secondary heating chambers (6) has a heater at its ceiling and bottom, and in the deoiling chamber, the metal powder is heated to 100°C or higher, which is necessary for deoiling, and then further raised. Greenhouse (5
), the temperature is raised or maintained at the temperature of the secondary heating chamber (6),
In the secondary heating room, the temperature required for decarburization is 550°C to 1200°C.
The metal powder is heated to

The cooling chamber (7) provided downstream of the secondary heating chamber (6) is designed to cool the deoiled and decarburized high-temperature metal powder to about room temperature without oxidizing it.

(Page 16) The cooled metal powder is taken out from the end of the moving bed (1).

connected to the supply system (to). The non-oxidizing gas supply system 0→ is configured to supply non-oxidizing gas from the downstream side of the warming chamber (5) and the F flow side of the cooling chamber,
-1) and (14-2) are pulps that respectively adjust the flow rate of gas. The decarburizing gas supply system α9 is configured to supply decarburizing gas from the center of the secondary heating chamber (6),
(15-1) is a valve that adjusts the flow rate of gas.

Most of the non-oxidizing gas supplied from the downstream side of the eliminator chamber (5) advances to the upstream side, exits from the upstream side of the deoiling chamber (4) to the outside, and is combusted by the exhaust gas combustion device 0.

This gas flow is intended to prevent oil mist generated by deoiling from being present in the heating chamber (4) as much as possible.

In addition, at the boundary between the heating chamber (5) and the secondary heating chamber (6),
A gas outflow wall α with a hollow structure is provided to allow atmospheric gas to flow out of the furnace, and a gas outflow wall with a similar hollow structure is provided at the boundary between the secondary heating chamber (6) and the cooling chamber (7). Outflow wall (
g) is provided. The decarburizing gas supplied to the secondary heating chamber (6) is discharged outside the furnace through the gas outflow wall α and the inside of the gas outflow wall, and is combusted in the exhaust gas combustion device QfJ. ing. Similarly, a portion of the non-oxidizing gas supplied to the heating chamber (5) passes through the gas outflow wall 07), and a portion of the non-oxidizing gas supplied to the cooling chamber (7) passes through the gas outflow wall (g) to the outside of the furnace. -C is discharged to the exhaust gas combustion device and becomes combusted by the exhaust gas combustion device.

The exhaust gas combustion device αQ is a combustion air refill hole (16-1)
A pilot burner (1, 6-2) is installed, and the exhaust gas is completely combusted.

The reason why the gas outflow wall αη is provided is that the atmospheric gas in the warming chamber (5) and the secondary heating chamber (6) mixes from one chamber to the other, and the metal powder in the warming chamber (5) is mixed. This is to prevent the decarburization reaction in the secondary heating chamber (6) from oxidizing and reducing the efficiency of the decarburization reaction in the secondary heating chamber (6). Sexual gas is N20
．． This is to prevent the formation of gas containing oxidizing gas such as Co2. It is desirable to provide a partition plate (I7-1) (ls-t) inside the gas outflow wall 07) (c) to more completely prevent the mixture of atmospheric gases in adjacent chambers. Furthermore, if the pressure of the atmospheric gas in each adjacent chamber is higher than the atmospheric pressure, the atmospheric gas in the chamber will be discharged to the outside of the furnace through the gas outflow wall α7) (g).
In order to enhance the effect of preventing mutual mixing of gases by the gas outlet wall, a blower (17-3818-3) is installed between the exhaust gas combustion device α and the gas outlet wall α (c) to forcefully prevent each gas from mixing. It is preferable to suck indoor atmospheric gas through the inside of the gas outlet wall, and in that case, a blower (17-3) is used.
There is a valve (17-2) between (18-3) and the gas outflow wall.
It is necessary to provide (18-2) to appropriately adjust the amount of gas flowing out.

In the apparatus shown in Figure 2 above, the exhaust gases of non-oxidizing gas and decarburizing gas are burned and disposed of, but these exhaust gases are introduced into the circulation system and are harmful to oil separation and reaction. It is possible to remove the gas component and recycle it for reuse.

(Page 19) Further, in the present invention, the configuration of a non-oxidizing gas supply system (8) and a decarburizing gas supply system (9) as shown in FIG. 3 can also be adopted.

In Figure 3, the non-oxidizing gas supply system (8) is connected only to the cooling chamber (7), that is, the non-oxidizing gas is supplied from the terminal end of the cooling chamber (7), and the non-oxidizing gas is supplied from the starting end of the cooling chamber (7). A heat exchanger 0 that cools the non-oxidizing gas that has reached a high temperature
→ is provided between the valve (8-4) and the blower (8-2) to constantly supply cold non-oxidizing gas to the cooling chamber (7).

In this case, the decarburizing gas supply system (9) uses N2 or a mixed gas of N2 and N2 as the decarburizing gas, so there is no need to worry about oxidation of the metal powder, and the oil content is A secondary heating chamber (
A system is constructed in which decarburizing gas is supplied from 6) and discharged from the upstream side of the secondary heating chamber (3). Note that (9-4) represents the pallet 7, (9-3) represents the decarburizing gas supply system, and (9-2) represents the blower.

The exhaust gas discharged from this secondary heating chamber (3) contains oil produced by deoiling and CH produced by decarburization.

(Page 20) Gas is contained, but the oil component is removed by the oil separator 00, and the gas component is removed by the gas component regulator 09 to the extent that it does not impede the decarburization reaction. Therefore, it can be supplied again to the secondary heating chamber (6) and used as a decarburizing gas. In the gas component regulator αB, OH and gas components are transformed into N20, and ■! 0 component is low temperature condensation, Co2 component is CO2
Removed by absorbent.

Next, embodiments of the invention will be described.

[Example 1] Wet components shown in Table 1 obtained by oil atomization,
Or-Mu based alloy steel powder having a particle size distribution is first
Deoiling and decarburization were performed using the equipment shown in the figure. The processing conditions at that time are shown in Table 2, and the processing results are shown in Table 3.

Part 1 Table 1 Unya passed away 1 go. Table 2 Table 3 From these results, when the oxygen content in the alloy steel powder was set to the initial low value, the oil removal rate was 99.6% or more, and the decarburization rate was 96.3.
% oil removal and decarburization effects were obtained.

[Example 2] An alloy powder of Or-Ni yarn having the components and particle size distribution shown in Table 4 and moistened with oil obtained by oil atomization was
Deoiling and decarburization were performed using the equipment shown in the figure. The processing conditions at that time are shown in Table 5, and the processing results are shown in Table 6.

Table 4 (page 23) Table 5 Table 6 (page 24) In these results, the oil removal rate was 99.6% when the oxygen content in the alloyed rice was kept at the initial low value. Above, decarburization rate 94
．． Great deoiling and decarburizing effects were obtained.

[Example 3] Or-Mo-W-V alloy steel powder having the components and particle size distribution shown in Table 7 and moistened with oil obtained by oil atomization was decomposed using the apparatus shown in Fig. 2. The oil was decarburized. The processing conditions at that time are shown in Table 8, and the processing results are shown in Table 9.

Table 7, Table 8, Table 9, maintain the amount at the initial low value and achieve an oil removal rate of 999% or more.
An oil and decarburization effect with a decarburization rate of 95.8% was obtained.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal cross-sectional side view showing an embodiment of the present invention, and FIG.
3 are explanatory diagrams showing another embodiment. In the figure, 1... moving bed, 2... supply hopper, 3...
- Lack of heat chamber, 4... De-oiling chamber, 5... Warming room, 6.
...Secondary heating chamber, 7. Cooling chamber, 8. Non-oxidizing gas supply system, 9. Decarburizing gas supply system, 10. Oil separator, 11. Gas component Regulator, 12... Heater, 13... Heat exchanger, 14... Non-oxidizing gas supply system, 15... Decarburizing gas supply system, 16... Exhaust gas combustion device, 17... ...Gas outflow wall, 18...Gas outflow wall. Applicant Sumitomo Metal Industries Co., Ltd. Voluntary procedure ♀ Hosei sho July 2, 1980 Director of the Patent Office Kazuo Wakasugi 1981 Patent application No. 125639 2 Title of invention Metal powder processing method and apparatus 3 , Relationship with the case of the person making the amendment Applicant Norifumi Kumagai 4, representative of Sumitomo Metal Industries, Ltd., 5-15 Kitahama, Higashi-ku, Osaka, 5, agent 5, In column 6 of ``Explanation'', content of the amendment as shown in the attached sheet 1, between 1 Ml, page 12, line 14 of ``...may be.''・There are also types that use pushers or rollers to move the tray continuously. ” is inserted. 2. In Table 2 on page 28 of the same specification, the pressure in the deoiling chamber l''
0.004 G kff/d J to r O,000
4Gkff/cd J and the pressure in the heating chamber ro, ooeG
+ mark f/-” l”0.0006G ky t/asl
J and the pressure of the secondary heating chamber rO, 004Gkyf/al
J is r O,0004Gl<zt/ciJ, and the pressure in the cooling chamber r o, o 06 a kyt/cd J is r
O,0006G kyf/ffl J, respectively. 8. In Table 5 on page 25 of the same specification, pressure in the deoiling chamber r O,
008G kyf/cyl J r O,0008G
k (H/ad J, and the pressure in the heating chamber 1"0.005G t/aJ3 is rO,0005Gkgf/~", and the pressure in the secondary heating chamber I'0.008 Glcyf/cd J is rO,0008Gkff /cdl, cooling chamber pressure rO, o05c, krf/i J is “0, OOO5G
krf/m J and corrected respectively. 4. In Table 8, page 27 of the same specification, the pressure in the deoiling chamber (No. 2
page) 1'-0,004G 1crf/i J to r O,0
004Gkyf/ail J and the pressure in the heating chamber r O,
006G] (Lif/cnJ wor O,0006GI
qt/1rIJ (!:, Secondary jJO heat & (7) Pressure [0,004GkgfAJ "0.0004Gginf/
dJ and the pressure of the cooling chamber rO, oo6Gk ri f/cdJ are corrected to rO, 0006G kyr/ctj J, respectively.

Claims (1)

[Claims] 1. Musical Or, Mn, ■ obtained by the music atomization method
A metal powder containing one or more easily oxidizable elements such as , Nb, B, and Si is supplied to a moving bed. After raising the temperature to 100°C or higher, it is further heated to 550 to 1200°C in a secondary heating process that maintains a decarburizing gas atmosphere.
1. A method for processing metal powder, which comprises heating the powder to a temperature of 100% and then cooling it in a cooling step in which a non-oxidizing gas surrounding atmosphere is created. 2 Sugar parts obtained by oil atomization method, Or, Mn, ■
, Nb, B, 8i, etc., is supplied onto a moving bed, and the metal powder on the moving bed is heated to 1.
After raising the temperature to 00"C or more, it is further heated to 550-1200°C in a secondary heating process that creates a decarburizing gas atmosphere, and then cooled in a cooling process that creates a non-oxidizing gas atmosphere. - It is characterized by separating the oil mixed in the gas discharged from the deficient heat process and removing the decarburization reaction inhibiting components mixed in the decarburizing gas discharged from the secondary heating process. Processing method for metal powder. 3. A moving bed that is equipped with wheels at both ends and moves endlessly, a supply device that supplies metal powder to two sides of the moving bed on the "second stream side," and a supply device provided on the downstream side of the supply device. a primary heating chamber connected to a non-oxidizing gas supply system; a secondary heating chamber provided downstream of the decarburizing gas supply system and connected to the decarburizing gas supply system; and a secondary heating chamber provided downstream of the secondary heating chamber. 1. A metal powder processing apparatus comprising: a cooling chamber connected to a non-oxidizing gas supply system; 4-The non-oxidizing gas supply system connected to the heat-deficient chamber must be a system for circulating non-oxidizing gas, and be equipped with an oil separator to separate oil contained in the gas flowing through the supply system. A metal powder processing apparatus according to claim 3, characterized in that: 5. The decarburizing gas supply system connected to the secondary heating chamber shall be a system for circulating decarburizing gas, and shall be equipped with a gas component regulator to adjust the components of the circulating decarburizing gas. Processing apparatus for metal powder according to characteristic patent claim (J-, + scope item 3. 6- The heat-deficient chamber is divided from the upstream side into a deoiling chamber and a heating chamber, and the pressure in the heating chamber is transferred to the deoiling chamber. and the metal powder processing apparatus according to claims 3, 4, and 5, characterized in that the pressure is maintained higher than the pressure of the secondary heating chamber. 7-Lack of heat chamber and the secondary heating chamber Claim 3, characterized in that a gas outflow wall with a hollow structure is provided at the boundary with the heating chamber to prevent gas from one chamber from entering the other chamber.
Items 4 and 5 Metal powder processing equipment.