JP2001262201A - Al SERIES POWDERY MIXTURE, GRANULATED BODY, PREFORM AND SINTERED BODY - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an Al series powdery mixture from which a sintered body excellent in formability and mechanical properties is made. SOLUTION: This Al series powdery mixture contains the powder of (1) to (3) or the powder of (1) to (4) shown in the following: (1) Cu powder, (2) Al-Mg series powder, (3) Al-Si-Fe series powder (wherein, Fe >=0.5 wt.%, and Si>=0.5 wt.%), and (4) Si powder. The powdery mixture is mixed in the componential ratios of 1 to 10 wt.% Si, 0.5 to 5 wt.% Fe, 0.2 to 6 wt.% Cu and 0.2 to 2 wt.% Mg, and the balance Al when the total of the powder is 100 wt.%.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a novel Al-based mixed powder, a granulated product, a preform and a sintered product.

[0002]

2. Description of the Related Art Aluminum is lightweight, workable, spreadable,
Due to their excellent specific strength and the like, aluminum products have been widely used in various fields as industrial materials for a long time. In recent years, these aluminum products (formed bodies)
It is increasingly produced by powder metallurgy. Powder metallurgy is not only high in yield because products can be manufactured in near net shape, but also has advantages such as the availability of rapidly solidified powder and easy compounding with hard particles. This is a manufacturing method that has been rapidly developed in recent years.

[0003]

However, aluminum products manufactured by the powder metallurgy method are different from aluminum products manufactured by the casting method, and their use is limited to some special fields and is not sufficiently widespread. is the current situation. The main reasons are the following three points.

[0004] 1. Manufacturing costs are often higher than castings.

[0005] 2. The strength is often lower than that of iron-based materials.

[0006] 3. Aluminum powder has low specific gravity and poor fluidity.

Further, in addition to these problems, the conventional aluminum alloy powder has a problem that the formability is extremely poor. In particular, in order to increase the strength of the final product, Cu, M
An element contributing to age hardening, such as g, is added to aluminum, and in an aluminum alloy powder produced by an atomizing method or the like, the moldability is significantly reduced. This low formability is also considered to be one of the factors that limit the improvement in strength and yield.

Accordingly, a main object of the present invention is to provide an Al-based mixed powder which can solve these problems and provide a sintered body having excellent moldability and excellent mechanical properties.

[0009]

Means for Solving the Problems The present inventor has made intensive studies to solve the problems of the prior art, and as a result, has found that the above object can be achieved by employing an Al-based mixed powder having a specific composition. Under the heading, the present invention has finally been completed.

That is, the present invention relates to the following Al-based mixed powders, granules, preforms and sintered bodies.

1. Powders of 1) to 3) shown below or 1) to 4)
1) Cu powder 2) Al-Mg powder 3) Al-Si-Fe powder (Fe ≧ 0.5% by weight,
4) Si powder Si: 1 to 10% by weight, Fe: 0.5 to 5% by weight, Cu: 0.2 to 6% by weight, Mg : Al-based mixed powder characterized by being mixed at a component ratio of 0.2 to 2% by weight and Al: the balance.

2. The mixed powder and wax according to the above item 1,
An Al-based granule containing at least one of a binder and a lubricating oil.

3. Al obtained by molding the granulated product according to the above item 2 by a cold press or a cold isostatic press.
System preform.

4. 4. The Al-based preform according to the above item 3, wherein the Rattler value is 30% or less.

[0015] 5. Composition: Si: 1-10% by weight, Fe:
0.5 to 5% by weight, Cu: 0.2 to 6% by weight, Mg:
0.2 to 2% by weight and Al: the balance: Al-based sintered body characterized by having a relative density of 90% or more and an HRF hardness of 80 or more.

6. 6. The Al-based sintered body according to the above item 5, wherein the tensile strength is 200 MPa or more.

[7] 7. The Al-based sintered body according to the above item 5 or 6, having a total of 10% by volume or less of pores having an average diameter of 1 to 400 µm and a structure containing an iron-based compound having a longest diameter of 200 µm or less.

[8] Item 8. The Al-based sintered body according to any one of Items 5 to 7, further including hard particles.

9. In the method for producing an Al-based sintered body, a powder containing 1) to 3) or a powder containing 1) to 4) shown below, wherein 1) Cu powder 2) Al-Mg-based powder 3) Al -Si-Fe-based powder (however, Fe ≧ 0.5% by weight,
4) Si powder Si: 1 to 10% by weight, Fe: 0.5 to 5% by weight, Cu: 0.2 to 6% by weight, Mg : A method for producing an Al-based sintered body, comprising using a raw material containing an Al-based mixed powder mixed at a component ratio of 0.2 to 2% by weight and Al: the balance.

[0020]

BEST MODE FOR CARRYING OUT THE INVENTION Al-based mixed powder The Al-based mixed powder of the present invention is a mixed powder containing the following 1) to 3) powders or 1) to 4) powders; 1) Cu powder 2) Al-Mg based powder 3) Al-Si-Fe-based powder (however, Fe ≧ 0.5% by weight,
4) Si powder Si: 1 to 10% by weight, Fe: 0.5 to 5% by weight, Cu: 0.2 to 6% by weight, Mg : 0.2 to 2% by weight and Al: the balance is such that the components are the balance.

As the Cu powder, those manufactured by a known manufacturing method can be used, and there is no particular limitation. For example, electrolytic copper powder, cutting powder, atomized powder and the like can be used. C
The average particle size of the u-powder can be appropriately set depending on the purpose of use, application, and the like of the final product, but is usually about 1 to 150 μm.

The Al—Mg based powder contains at least Al and M
It is not limited as long as it contains g, and those manufactured by any manufacturing method or commercially available products can be used. In the present invention, an alloy powder composed of only Al and Mg is particularly preferable, and Al-
A 40-60 wt% Mg alloy is more preferred. Al-Mg
The average particle size of the system powder can be appropriately set depending on the purpose of use, use, and the like of the final product, but is usually about 1 to 150 μm.

The Al—Si—Fe-based powder contains at least A
It is not particularly limited as long as it contains l, Si and Fe,
A product manufactured by a known manufacturing method such as an atomizing method or a commercially available product can also be used. In the present invention, an alloy powder composed of only Al, Si and Fe is particularly preferable. Especially when Si is 0.5
% By weight or more, 0.5% by weight or more of Fe, and A
It is preferable to use an alloy powder of l. More preferably, in the alloy powder, Si: 1 to 10.9% by weight, Fe: 0.5
Use alloy powder that is ５5.4% by weight and balance: Al. The average particle size of the Al-Si-Fe-based powder can be appropriately set depending on the purpose of use, use, and the like of the final product.
It may be about 150 μm.

The Si powder is not particularly limited as long as it contains Si as a main component, and a powder manufactured by a known method or a commercial product can be used. For example, Si crushed powder or the like can be used. The average particle size of the Si powder can be appropriately set depending on the purpose of use, use, and the like of the final product, but is usually set to about 1 to 150 μm.

Further, other components (powder) can be appropriately added to the mixed powder of the present invention, if necessary. For example, Mn, Mo, V, Cr, Ni, Ti, Zr, Zn,
At least one of Pb, Bi, In, Sb and the like can be added to the mixed powder.

The timing of adding these components, the form in which they are added, and the like are not particularly limited. For example, as the addition time, it can be added at the stage of preparing the mixed powder, or can be added at the stage of compounding a wax or the like. In addition, as an addition form, these components can be added as a single metal powder, or can be compounded as an alloy powder composed of two or more of these components.

In the mixed powder of the present invention, the total of the above powders is 1
Si: 1 to 10% by weight, Fe: 0.5 as 00% by weight
-5% by weight, Cu: 0.2-6% by weight, Mg: 0.2-
2% by weight and Al: The components are mixed in such a proportion as to be the balance.

The content of the Si component is usually about 1 to 10% by weight, preferably 1.5 to 6% by weight, and more preferably 2 to 4% by weight. If it is less than 1% by weight, the bonding strength between the powders may not be sufficient. If it exceeds 10% by weight, the sintered body becomes brittle, and a desired strength may not be obtained.

The Fe component is usually about 0.5 to 5% by weight,
Preferably, it may be 1.5 to 4.5% by weight. 0.5
If the amount is less than the weight%, the room temperature strength or heat resistance may be insufficient. If the content exceeds 5% by weight, a coarse iron-based compound is generated, and there is a possibility that toughness, impact resistance and the like may be reduced.

The Cu component is usually about 0.2 to 6% by weight,
Preferably, it may be 1 to 5% by weight. If the amount is less than 0.2% by weight, the effect of age hardening may be insufficient. 6
If the content is more than 10% by weight, crystallized substances or precipitates may be coarsened.

The Mg component is usually about 0.2 to 2% by weight,
Preferably, the content should be 0.4 to 1.8% by weight. 0.2
When the amount is less than the weight percentage, the effect of age hardening may be insufficient. If it exceeds 2% by weight, a crystallized substance or a precipitate may be coarsened.

The Al component substantially constitutes the balance. In addition to these components, the present invention may contain unavoidable impurities as long as the effects are not hindered.

The mixed powder of the present invention uses each powder described above,
It can be obtained by mixing uniformly to obtain the above-mentioned predetermined composition. The mixing may be performed by a known mixing means in powder metallurgy. For example, the mixing can be performed by a dry or wet method using a V blender, a mixer, a ball mill, or the like. 2. Granulated body and preform The Al-based granulated body of the present invention contains the mixed powder of the present invention and at least one of a wax, a binder, and a lubricating oil (hereinafter, these are also collectively referred to as “wax or the like”). Known waxes or commercially available waxes can be used. As the wax and the like, for example, ethylene bis stearamide, methylene bis stearamide, oleamide, paraffin, stearic acid, oleic acid, polyethylene, polyvinyl alcohol, castor oil, polyethylene oxide and the like can be used.

The amount of the wax or the like to be added can be appropriately set according to the type of the wax or the like to be used, the use of the final product, and the like.
About 5 parts by weight, preferably 0.3 to 3 parts by weight. By adding in such a range, a granulated body having particularly excellent fluidity can be produced, and as a result, a sintered body having higher density, higher strength, HRF hardness, and the like can be obtained.

In the present invention, the addition of wax and the like to the mixed powder is preferably carried out while heating to about 80 to 250 ° C. By heating, granules can be produced more easily and reliably.

The size of the Al-based granules of the present invention is not particularly limited, and may be appropriately determined according to the purpose of use of the final product, etc., and usually has an average particle size of about 40 to 200 μm.
Within this range, particularly good fluidity and moldability can be obtained. The adjustment of the particle size can be appropriately performed using a vibration sieve or the like.

The Al-based preform of the present invention is obtained by molding the granules of the present invention by cold pressing or cold isostatic pressing. The conditions of the cold press or the cold isostatic press are not particularly limited, but the pressure may preferably be 100 to 800 MPa. The density of the preform can be controlled mainly by the above pressure, and can be appropriately changed depending on the desired density of the sintered body, but it is usually preferably 70% or more of the theoretical density (relative density 70% or more). . 3. Al-based sintered body The Al-based sintered body of the present invention has a composition of Si: 1 to 10% by weight.
(Preferably 1.5 to 6% by weight, more preferably 2 to 4% by weight.
%), Fe: 0.5 to 5% by weight (preferably 1.5% by weight)
-4.5% by weight), Cu: 0.2-6% by weight (preferably 1-5% by weight), Mg: 0.2-2% by weight (preferably 0.4-1.8% by weight) and Al: The balance is 90% or more in relative density and 80 or more in HRF hardness.

The reason for setting the composition of each component is as follows.
This is the same as the reason for setting the component composition in the mixed powder of the present invention. By setting the content within the above range, particularly excellent mechanical properties can be obtained.

The sintered body of the present invention has a relative density of usually 90% or more, preferably 94 to 99%. If it is less than 90%, desired mechanical properties may not be obtained.

The HRF hardness of the sintered body of the present invention may be generally at least 80, preferably at least 85. If it is less than 80, desired mechanical properties may not be obtained. The HRF hardness in the present invention is based on HRF: Rockwell hardness f scale.

The sintered body of the present invention has a tensile strength of 200
It is preferably at least 250 MPa, particularly preferably at least 250 MPa. If it is less than 200 MPa, the strength is lower than that of a conventional iron-based sintered body, which is not preferable.

Further, in the sintered body of the present invention, the average diameter is 1 to
It is desirable to have a structure containing an iron-based compound having a total pore size of 400 μm of 10% by volume or less and a longest diameter of 200 μm or less. That is, it is desirable that the sintered body of the present invention has few pores and the above-mentioned iron-based compound is dispersed in the sintered body matrix.
By having such a structure, especially the heat resistance of the sintered body can be further improved.

The total volume (%) of pores having an average diameter of 1 to 400 μm is determined by measuring the apparent density by the Archimedes method, dividing the value by the theoretical density and multiplying the value by 100 to obtain a relative density (%). The value obtained by subtracting the relative density from 100 was used. The average diameter of the pores is determined by observing an arbitrary cross section (10 places) of the sintered body with a microscope, and measuring the longest diameter of the pore in each cross section (the maximum distance when the pore is sandwiched between two parallel lines) and the shortest diameter. It can be measured by the arithmetic average of (the shortest distance when the pore is sandwiched between two parallel lines).

The longest diameter of the iron-based compound is defined by observing an arbitrary cross section (10 places) of the sintered body with a microscope and observing the longest diameter of the iron-based compound (particles) in each cross section (by using two iron-based compounds). It is the value measured by the arithmetic average of the maximum distance when sandwiched between parallel lines). The fact that the particles are iron-based compounds can be confirmed and identified by EDS, EDX, EPMA and the like. The type of the iron-based compound varies depending on the type, composition, and the like of the mixed powder to be used, but is not particularly limited as long as it contains Fe and contributes to improvement in heat resistance. For example, Al ₃ Fe, Al ₆ Fe, Al—Fe—S
i-based compounds, Al-Cu-Fe-based compounds, and the like.

The Al sintered body of the present invention may further contain hard particles as required. In the present invention, more excellent wear resistance can be obtained by dispersing the hard particles in the sintered body matrix. Examples of the hard particles include oxides such as alumina (Al ₂ O ₃ ); nitrides such as silicon nitride, boron nitride, and aluminum nitride; carbides such as silicon carbide; Fe—Al alloys; Ti—Al alloys; In addition to alloys such as Al-based alloys or intermetallic compounds, carbon and the like can be used.

The size of the hard particles may be appropriately set according to the type of the hard particles used, the use of the final product, and the like.
Usually, the average particle size (by laser diffraction type particle size distribution measuring method) may be about 0.5 to 20 μm. By setting the content within such a range, more excellent dispersibility can be obtained, and the mechanical properties of the obtained sintered body can be further improved. The shape of the hard particles is not particularly limited, and may be, for example, any one of a spherical shape, a needle shape, a flat shape, a plate shape, an irregular shape, a teardrop shape, and the like, and particularly preferably a spherical shape or a shape close thereto. The addition time of the hard particles is not particularly limited, and they can be added, for example, at the time of preparing a mixed powder, at the time of manufacturing a granulated body, and the like.

The content of the hard particles can be appropriately changed depending on the kind, size, etc. of the hard particles to be used, but usually, it may be about 0.5 to 15% by weight in the sintered body.

The method for producing the sintered body of the present invention is not limited as long as the one having the above-described composition and properties can be obtained.
A powder of a simple metal or an alloy which can be a supply source of each component is used, mixed with a predetermined composition, and molded, sintered and the like may be performed according to a conventional method.

In particular, in the present invention, it is preferable to produce an Al-based sintered body by the following production method. That is, a mixed powder containing the powders of 1) to 3) or the powders of 1) to 4) shown below: 1) Cu powder 2) Al-Mg powder 3) Al-Si-Fe powder (however, , Fe ≧ 0.5% by weight,
4) Si powder Si: 1 to 10% by weight, Fe: 0.5 to 5% by weight, Cu: 0.2 to 6% by weight, Mg : 0.2 to 2% by weight and Al: a raw material containing an Al-based mixed powder mixed in such a proportion as to become the balance is desirably used. That is, it is preferable to manufacture a sintered body using the raw material containing the Al-based mixed powder of the present invention.

In particular, it is preferable to produce an Al-based sintered body by producing a granule using the above-mentioned mixed powder, producing a preform from this, and sintering the preform. The granulated product of the present invention and the preform of the present invention can be used as the granulated product and the preform, respectively.

The sintering conditions are not particularly limited, but are usually 530 to 65 in a non-oxidizing atmosphere such as an inert gas or a nitrogen gas, a reducing atmosphere such as an ammonia gas, or a vacuum.
The temperature may be set to about 0 ° C. The sintering is preferably performed in a nitrogen gas atmosphere from the viewpoint of cost. The sintering time can be changed as appropriate depending on the type of the sintered body, the sintering temperature, and the like, but is usually about 10 minutes to 5 hours.

The pressure during sintering is not necessarily limited, but is preferably at or near normal pressure in terms of equipment or cost. Specifically, it may be carried out at about 0.8 to 1.2 atm.

In the present invention, after sintering, if necessary, a natural aging (T4) treatment after the solution treatment, an artificial aging (T6) treatment after the solution treatment, or the like is performed to further increase the strength (particularly, 1%).
Strength in a temperature range of 50 ° C. or lower). Processing conditions such as T4 processing and T6 processing may be in accordance with a conventional method.

The sintered body of the present invention is used for applications requiring tensile strength, heat resistance, hardness, abrasion resistance, impact resistance, etc., for example, gears (gears), pulleys, rotors, bearings, bolts, nuts, washers. , Spacers, bushes, and mechanical parts such as support shock absorbers for power steering racks.

[0055]

According to the Al-based mixed powder of the present invention composed of a specific powder, an Al-based sintered body having good moldability and excellent mechanical properties can be obtained efficiently and reliably. . That is, Cu powder (pure powder), Fe
Al-Si-Fe-based powder, M
Since the Al-Mg-based powder is used as the g component, the moldability can be improved. As a result, a sintered body having excellent mechanical properties such as hardness, tensile strength, and heat resistance can be provided.

Further, since the granules of the present invention are provided with wax or the like in advance, they can further contribute to improvement of moldability, fluidity and the like. At the same time, the possibility of contamination of the working environment due to generation of dust can be avoided. Since fine powder can also be effectively used, cost can be reduced. Furthermore, if this granule is used, it is not necessary to apply a lubricant or the like to the mold again during molding.

The Al-based sintered body of the present invention can obtain mechanical properties (strength, impact resistance, etc.) comparable to or higher than iron. Further, excellent heat resistance can be exhibited as compared with a conventional sintered body made of aluminum (without plastic working).

The Al-based sintered body of the present invention can be produced, in particular, by normal pressure sintering, and does not necessarily require plastic working such as extrusion and forging during sintering. Therefore, costs can be reduced in terms of facilities, processes, and the like, and mass productivity is excellent.

[0059]

【Example】

[0060]

The present invention will be specifically described below with reference to examples and comparative examples. However, the present invention is not limited to these examples.

Example 1 A powder having the composition shown in Table 1 was produced by air spraying.

[0062]

[Table 1]

Each alloy powder was used as a base powder.
Each powder mixture was prepared by mixing other powders with the composition shown in Table 1.

In Table 2, the average particle diameter of each aluminum alloy powder is about 50 μm under a 355 μm sieve, the average particle diameter of Cu powder is about 25 μm, and the average particle diameter of Al-50 wt% Mg alloy powder is about 30 μm. The average particle size of Si powder is about 1
Each having a thickness of 5 μm was used.

[0065]

[Table 2]

Next, 1.5 parts by weight of ethylene bis stearoamide (powder wax) as a lubricating oil was added to 100 parts by weight of the mixed powder, and mixed by a V blender. The obtained mixture was stirred and mixed while heating at 200 ° C. to produce a granulated body. After performing cold press molding at a surface pressure of 2 ton / cm ² using the granulated material, the molded product was sintered at 590 ° C. for 30 minutes in a nitrogen gas atmosphere.
The sintered body was subjected to T6 treatment. T6 treatment is 495 ° C
, And then quenched in water, kept at 190 ° C. for 9 hours, and then gradually cooled. The relative density, hardness (HRF) and tensile strength at room temperature of the obtained test body (sintered body after the T6 treatment) were measured. Table 3 shows the results.
Shown in

The relative density was measured by the Archimedes method. Hardness was measured using a Rockwell tester F scale. The tensile strength was measured on an ISO No. 2 plate-shaped test piece using an Amsler testing machine.

The same test as described above was carried out on a sintered body manufactured by applying the same composition as in Table 2 except that pure Al powder was used as a base powder as a comparative test body. Table 3 also shows the results.

[0069]

[Table 3]

In Table 3, the alloy powder M does not include the pure Cu powder and Al-50 wt% Mg powder shown in Table 2. The alloy powder L 'does not include the pure Si powder shown in Table 2.

From the results shown in Table 3, it can be seen that the mixed powder of the present invention can provide a highly reliable sintered body having an HRF hardness of 80 or more and a tensile strength of 200 MPa or more.

Example 2 Granulation was carried out in the same manner as in Example 1 except that the alloy powder D used in Example 1 was used as a base powder. When performing cold press forming using the granules, the cold press forming surface pressure is changed between 1 to 2 ton / cm ² to change the density of the cold press formed green compact, Table 4 shows the relative density of
Specimens were prepared in the same manner as in Example 1 except that the test pieces were changed as shown in (1). About the obtained test body, the tensile strength at room temperature, HRF hardness, and the pore size in the sintered body were measured. Table 4 shows the results. The pore size was determined by microscopic observation of the cross section of the test specimen. FIG. 1 shows the results of microscopic observation of a specimen having a relative density of 89%, and FIG. 2 shows the results of microscopic observation of a specimen having a relative density of 97%.

[0073]

[Table 4]

From the results shown in Table 4, it can be seen that at a relative density of 90% or more, a highly reliable material having a tensile strength of 200 MPa or more and an HRF hardness of 80 or more can be obtained.

Example 3 A mixture obtained by further dispersing alumina having an average particle size of 5 μm in the ratio shown in Table 5 in the mixture used in Example 2 was granulated so that the relative density of the sintered body became 95%. Other than that, cold press molding and sintering were performed in the same manner as in Example 2, and further T6 treatment was performed. The tensile strength at room temperature and the HRF hardness of the obtained specimen were measured in the same manner as in Example 1. In addition, the obtained specimens were subjected to an Ogoshi wet abrasion test. Table 5 shows the results. The conditions of the Ogoshi wet abrasion test were as follows: the friction speed was 1.63 m / sec, the friction distance was 200 m, the load was 2.1 kgf, and the mating material was FC30 when the lubricating oil was dropped.

[0076]

[Table 5]

From the above results, it was found that the content of alumina was 0.5
In the case of １２12 parts by weight, it was found that the sintered body had a tensile strength of 200 MPa or more and a small specific wear amount.

Example 4 A mixed powder was obtained in the same manner as in Example 1 except that the alloy powder L used in Example 1 was used as a base powder. Then
0 parts by weight, 0.5 parts by weight, 1.0 parts by weight, 1.5 parts by weight, 3.0 parts by weight, and 7.0 parts by weight of ethylene bis stearamide are added to this mixed powder as a lubricant. Specimens were prepared in the same manner as in Example 1 except that the prepared mixture was prepared. Relative density, HR for this specimen
F hardness and tensile strength were measured. Table 6 shows the results.

[0079]

[Table 6]

As shown in Table 6, by adding a wax, cold press molding can be performed more favorably, and as a result, an Al-based sintered body having excellent mechanical properties can be obtained. .

Example 5 Using the alloy powder D of Example 1 as a base powder, a molded article obtained in the same manner as in Example 1 was subjected to measurement of relative density and a Rutler test. In addition, as a comparative specimen,
Al-2 wt% Fe-3 wt% Si-4.4 wt% Cu
Except for adding 0.8% by weight of Si to the -0.5% by weight Mg alloy powder, the measurement of the relative density and the Rutler test were also performed on the test pieces prepared in the same manner as in Example 1. Table 7 shows the results. However, these specimens have a pressure of 1
It was formed by a cold isostatic press (CIP) of ton / cm ² .

The method of measuring the Rutler value was carried out as follows. First, using a rubber mold, φ about 20mm
× CIP molding (cold isostatic molding) with a length of about 50 mm (weight of about 20 to 25 g) at a pressure of 1 ton / cm ² . The weight of the obtained molded body is measured, and the number of rotations of a rattling tester (manufactured by Minerva) is set to 60 rotations (rpm). Next, the molded body was inserted into the rattling tester,
The molded body remaining after rotation is taken out and its weight is measured. Using the measured value W1 before the test and the measured value W2 after the test, a Rattler value is calculated by the following equation.

[0097] Rutler value (%) = 100 × (W1−W2) / W1

[0084]

[Table 7]

As shown in Table 7, Cu,
It can be seen that when an element involved in age hardening, such as Mg, is included, the alloy powder itself becomes hard and reduces the formability. A test piece having a Ratler value of 55 was sintered in the same manner as in Example 1, but the density did not increase, and only a strength that could be easily broken by hand was obtained.

[Brief description of the drawings]

FIG. 1 is a microscopic observation of a specimen having a relative density of 89% (25%).
2 times).

FIG. 2: Microscopic observation of a specimen having a relative density of 97% (25
2 times).

Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat II (reference) C22C 21/02 C22C 21/02 21/12 21/12 (72) Inventor Kazuhiko Yokoe Kutaro-cho, Chuo-ku, Osaka-shi, Osaka 6-8-8 Toyo Aluminum Co., Ltd. (72) Inventor Naoyuki Inada 363 Asono, Kamioka-cho, Yoshiki-gun, Gifu Prefecture Inside Kamioka Parts Industry Co., Ltd. (72) Ryo Okada, Aso, Kamioka-cho, Yoshiki-gun, Gifu Prefecture No. 363 F-term in Kamioka Parts Industry Co., Ltd. (reference) 4K018 AA15 AA16 BA02 BA08 BA13 BA20 BC12 CA07 CA23

Claims (9)

[Claims] 1. A mixed powder containing the following powders 1) to 3) or powders 1) to 4), wherein 1) Cu powder 2) Al-Mg powder 3) Al-Si-Fe powder Powder (however, Fe ≧ 0.5% by weight,
4) Si powder Si: 1 to 10% by weight, Fe: 0.5 to 5% by weight, Cu: 0.2 to 6% by weight, Mg : Al-based mixed powder characterized by being mixed at a component ratio of 0.2 to 2% by weight and Al: the balance. 2. An Al-based granule comprising the mixed powder according to claim 1 and at least one of a wax, a binder and a lubricating oil. 3. An Al-based preform obtained by molding the granulated product according to claim 2 by cold pressing or cold isostatic pressing. 4. The Al-based preform according to claim 3, which has a Rutler value of 30% or less. 5. A composition comprising: Si: 1 to 10% by weight;
5 to 5% by weight, Cu: 0.2 to 6% by weight, Mg: 0.2
２2% by weight and Al: balance and relative density 9
An Al-based sintered body characterized by having an HRF hardness of 80% or more and 0% or more. 6. The Al-based sintered body according to claim 5, which has a tensile strength of 200 MPa or more. 7. A total of 10 pores having an average diameter of 1 to 400 μm.
7. A according to claim 5 or 6, wherein the composition has a tissue containing an iron-based compound having a maximum volume of 200 µm or less and a volume% or less.
l-based sintered body. 8. The Al-based sintered body according to claim 5, further comprising hard particles. 9. A method for producing an Al-based sintered body, comprising: 1) Cu powder; 2) Al-Mg powder comprising the following powders 1) to 3) or 1) to 4): System powder 3) Al—Si—Fe system powder (however, Fe ≧ 0.5% by weight,
4) Si powder Si: 1 to 10% by weight, Fe: 0.5 to 5% by weight, Cu: 0.2 to 6% by weight, Mg : A method for producing an Al-based sintered body, comprising using a raw material containing an Al-based mixed powder mixed at a component ratio of 0.2 to 2% by weight and Al: the balance.