KR20190069943A - Method of manufacturing a layered friction machine parts made of ductile-phase dispersed copper alloy - Google Patents

Abstract

Provided is a method for manufacturing a friction machinery member of a soft phase dispersed and layered structure. The manufacturing method of the present invention comprises: a process of preparing a main metal material; a process of preparing metal powder by mixing hard copper alloy powder and soft pure metal powder; a process of stacking the mixed metal powder on the surface of the main metal material; a process of forming a coating layer by maintaining the main metal material stacked with the metal powder at 700-900°C in a reducing atmospheric furnace for 10-40 minutes, uniformly dispersing a soft pure metal phase on a hard alloy phase, and thus making the main metal material integrated with the metal powder; and a process of manufacturing machinery parts in predetermined shapes by shaping the main metal material integrated with the coating layer. The mixed metal powder consists of hard alloy powder based on 85-95 wt% of brass powder and 5-12 wt% of bronze powder; and soft pure metal powder based on at least one pure metal powder selected from among 0.01-5 wt% of copper (Cu) powder, 0.01-5 wt% of aluminum (Al) powder, 0.01-5 wt% of silicon (Si) powder, 0.01-5 wt% of titanium (Ti) powder, 0.01-5 wt% of iron (Fe) powder, 0.01-5 wt% of nickel (Ni) powder, 0.01-5 wt% of manganese (Mn) powder, and 0.01-5 wt% cobalt (Co) powder.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a method of manufacturing a friction machine member having a soft phase dispersed layer structure,

The present invention relates to a method of manufacturing a friction material having a double structure or a multi structure in which a duct phase is dispersed in a base to provide excellent momentary bonding properties during power transmission or power control. More particularly, In producing a mechanical member having a dual or multiple structure in which powder is coated, it is possible to produce a mechanical member having a composite structure having a composite structure having excellent friction characteristics and instantaneous bonding properties by uniformly dispersing a pure metal flux phase in the hard phase of the alloy powder in the surface layer structure And a manufacturing method thereof.

Generally, a high strength copper alloy widely used as a mechanical member or a structural material in a non-ferrous alloy is formed by adding an alloy element such as aluminum (Al), nickel (Ni), silicon (Si), manganese (Mn) As an alloy produced by melt casting, it represents a single structure or powder sintered structure and has excellent mechanical properties such as hardness, strength, abrasion resistance and toughness. Particularly, these copper alloys are widely used for automobile synchronizer rings and general machines, and are used for manufacturing worm wheels, bearings, slippers for compressors, and other high-speed components. The use of these alloys is also increasing as related parts. However, Decreasing the coefficients reduces momentary power transfer or power control capability.

An example of such a technique is the invention described in Patent Document 1. Patent Document 1 discloses a copper alloy containing 55 to 75 wt% of copper, 0.1 to 8 wt% of aluminum, 0.3 to 3.5 wt% of iron, 0.5 to 8 wt% of manganese, 0 to less than 5 wt% of nickel, From 0 to less than 0 wt.% Lead, from 0 to 3 wt.% Tin, from 0.3 to 5 wt.% Silicon, from 0 to less than 0.1 wt.% Cobalt, from 0 to less than 0.05 wt. And a method of melting and casting using a copper-zinc alloy containing impurities and a residual amount of zinc to produce a high strength copper alloy.

     However, parts made of high-strength copper alloys made of alloys have a single structure or a powder sintered structure with high hardness but low frictional force, and the operation of these parts composed of these parts due to wear and shock due to rotational motion during long- There is a problem that the life of these parts or the relative contact material is shortened or sometimes these parts are broken. Recently, since the power transmission mechanism of an automobile transmission has a tendency to require a strong bonding force and an effective power transmission and control momentarily, a material having a high coefficient of friction and excellent abrasion resistance is required as a material for a transmission, The high strength copper alloy material is accompanied by difficulties in meeting the characteristics. Accordingly, there is a demand for components that are excellent in friction characteristics and wear resistance characteristics and can improve energy efficiency in order to improve efficiency of power transmission and control.

Components used in the automotive transmission industry generally have high mechanical strength, excellent friction characteristics on the inner circumferential surface in contact with the mating member, and sufficient abrasion resistance, and various manufacturing methods are known for achieving this. As a method of manufacturing a layer having improved abrasion resistance compared to Cu-Zn and Cu-Sn alloy powder parts used in the automotive transmission industry, a ceramic and oxide (Mo-based oxide) having a high melting point and hardness as a metal and a dissimilar metal are uniformly And a manufacturing method in which an inner circumferential surface is adhered by a flame spraying method from a sintered body obtained by mixing and forming a metal powder and a non-metal powder and sintering at a high temperature has been used. However, when a non-metallic powder such as an oxide, a carbide, or a nitride is added to improve the hardness and the abrasion resistance of the parts used in the automotive transmission manufactured by such a manufacturing method, Or the nonmetal additive is separated during use due to the deterioration of the interfacial wettability. As a result, the strength of the nonmetal additive deteriorates, or quality irregularity occurs due to unevenness of the coating film, resulting in poor friction characteristics and abrasion resistance. Particularly, when plasma spray coating is used to manufacture parts used in the automotive transmission, there is a surface peeling phenomenon due to a difference in thermal expansion coefficient between the base material and the surface layer due to the frictional heat generated during gear shifting, and incomplete melting The particles are adhered to each other to cause surface defects, which causes the frictional characteristics to deteriorate or cause the abrasion of the mission-related parts due to the drop of the attached particles.

As an example of this technique may be made of the invention described in Patent Document 2, Patent Document 2 to 80% brass powder, silicon oxide (SiO ₂₎ 4-6%, aluminum oxide _{(Al 2 O 3) 0.5-1.5%} , carbon (C) 4-6%, tin (Sn) 3.5-6.5%, iron (Fe) 18-22% or less, and the metal alloy powder and the oxide powder are mixed and sintered .

On the other hand, in the case of a sintered alloy using a copper alloy powder having high strength and thermal conductivity, it is used for various mechanical parts (turbocharged bearings, valve guides for engines, thrust receiving members and key parts for gear pumps) in addition to synchronizer rings. However, it is difficult to maintain the composition of the copper alloy sintered body, the bonding force between the base metal and the dissimilar metal is not sufficiently secured, defects are caused on the surface of the product manufactured from the copper alloy sintered body, or the mechanical characteristics and composition of the surface and the center of the sintered body are uneven, Problems accompany. As an example of such a technique, the invention disclosed in Patent Document 3 can be cited. In Patent Document 3, the ratio of zinc (Zn) is 10-15% and the ratio of tin (Sn) is 4-7% And the ratio is 0.3% or less.

In recent years, parts for adhering carbon fibers to a steel surface by using an adhesive have been developed to provide excellent wear resistance and friction coefficient, but also problems of carbon fiber desorption due to friction resistance heat are also caused.

As described above, in order to manufacture machine parts such as a transmission for a transmission machine, an alloy system (Patent Document 1) for melting and casting using pure metals (Patent Document 1), a method for producing a mixture of powders and oxides (Patent Document 2) (Zn) and 10% or less of tin (Sn) based on the components of the copper alloy synchronizer ring, regardless of the manufacturing type. Or a non-ferrous metal or powder, or by a combination of oxides. In addition, the syngas ring manufactured by the melt casting (patent document 1) or the powder sintering method has a problem that the friction coefficient, the texture, and the reliability of life are deteriorated. Particularly, when it is produced by a method in which oxides are added in combination (Patent Document 2), the refractory metal (Fe) or the oxides (SiO _2, Al ₂ O ₃ ) decrease in sintering property during sintering, It has a limitation in that it causes a decrease in the mechanical properties and the service life due to the increase of the distribution and the decrease of the bonding force, and also causes the energy efficiency to be reduced due to the inefficiency of the power transmission and control

Korean Patent Publication No. 10-2008-0080156 US Patent 5324592 Korean Patent Publication No. 10-2013-0002584

SUMMARY OF THE INVENTION Accordingly, the present invention has been made to overcome the above-mentioned problems of the prior art and it is an object of the present invention to provide a friction machine member having a high friction coefficient and a high wear resistance, Which is excellent in strength, abrasion resistance, friction coefficient characteristics, and instantaneous bonding force by uniformly distributing a ductile phase in a matrix, thereby providing a friction member having a double structure.

 Further, the technical problems to be solved by the present invention are not limited to the technical problems mentioned above, and other technical problems which are not mentioned can be understood from the following description in order to clearly understand those skilled in the art to which the present invention belongs .

According to an aspect of the present invention,

Preparing a metal base material;

Mixing a hard copper alloy powder and soft pure metal powder to prepare a metal powder;

Laminating the mixed metal powder on the surface of the metal base material;

The metal base material in which the metal powder is laminated is maintained at 700 to 900 DEG C for 10 to 40 minutes in a reducing atmosphere to uniformly distribute the soft pure metal phase on the hard alloy and integrate the metal powder into the metal base material, ; And

And a step of forming a mechanical part of a predetermined shape by molding the metal base material in which the coating layer is integrated,

By weight based on the mixed metal powder,

The hard alloy powder is composed of 85 to 95% of brass powder and 5 to 12% of bronze powder,

The soft pure metal powder may contain 0.01 to 5% of copper (Cu) powder, 0.01 to 5% of aluminum powder, 0.01 to 5% of silicon powder, 0.01 to 5% of titanium powder, At least one selected from the group consisting of: 0.01 to 5% of iron (Fe) powder, 0.01 to 5% of nickel (Ni) powder, 0.01 to 5% of manganese (Mn) powder and 0.01 to 5% of cobalt The present invention relates to a method of manufacturing a friction material having a layered structure having a high coefficient of friction and a high wear resistance.

The brass powder may contain zinc (Zn) in a range of 15 to 20%.

The bronze powder may contain tin (Sn) in the range of 7 to 12%.

The bronze powder may be phosphor bronze powder.

It is preferable that the P content in the phosphor bronze powder is 0.1% or less, preferably 0.05% or less.

The soft, pure metal powder may have an average particle diameter of 0.5 to 50 탆.

The step of integrating the coating layer into the base metal preform and then maintaining the coating layer at 300 to 600 ° C for 10 to 40 minutes in a reducing atmosphere may be further included.

Preferably, the soft pure metal powder further comprises silver (Ag) in the range of 0.01 to 5.0%.

In the present invention, it is preferable to use a multi-step gradual molding process in the molding process.

The present invention having the above-mentioned constitution is characterized in that, in manufacturing a friction mechanism member having a dual structure, copper (Cu) powder, aluminum powder, titanium powder, silicon (Ductile) is added to the periodic matrix by adding soft powders such as Si powder, Fe powder, Ni powder, Mn powder, Co powder and Ag powder. phase) uniformly distributed, and has excellent bonding strength, improves the instantaneous bonding force of the friction machine member, facilitates co-axial transmission and control, can provide a high friction coefficient for improving energy efficiency and excellent wear resistance property .

In addition, since there is no defect in the interface between the base material and the dissimilar metal coating layer, the coating layer can be uniformly formed to improve the processability, and the process efficiency can be improved. Therefore, a double structure having high strength, abrasion resistance, Or multi-structure friction machine members.

1 illustrates a manufacturing process of a double or multi-structure frictional mechanical member having a coating layer uniformly distributing a soft phase of a pure metal in a matrix structure using a hard alloy powder using the reduction process of the present invention Fig.
FIG. 2 (a) is a schematic view showing a microstructure of a double or multi-structure high-strength wear-resistant alloy coated with a coating layer in which a soft phase of a pure metal is uniformly distributed in a matrix structure using the hard alloy powder of the present invention.

Hereinafter, the present invention will be described.

The present invention provides a friction machine member having a dual or multiple structure by providing a coating layer in which a ductile phase is uniformly distributed in a matrix, which is a hard phase, by adding a soft powder to an alloy powder having a high strength The present invention provides a method of manufacturing a friction material having a double structure having high strength, abrasion resistance, friction coefficient, and instantaneous bonding strength.

The method for manufacturing a friction material member of the present invention comprises the steps of preparing a metal base material; Mixing a hard copper alloy powder and soft pure metal powder to prepare a metal powder; Laminating the mixed metal powder on the surface of the metal base material; The metal base material in which the metal powder is laminated is maintained at 700 to 900 DEG C for 10 to 40 minutes in a reducing atmosphere to uniformly distribute the soft pure metal phase on the hard alloy and integrate the metal powder into the metal base material to form a coating layer ; And a step of manufacturing a mechanical part of a predetermined shape by molding the metal base material in which the coating layer is integrated.

1 illustrates a manufacturing process of a double or multi-structure frictional mechanical member having a coating layer uniformly distributing a soft phase of a pure metal in a matrix structure using a hard alloy powder using the reduction process of the present invention Fig.

First, a metal base material is prepared. A plate-shaped base material in the form of a disc is prepared and the contaminants present on the surface of the steel base material are cleaned. Cleaning of the base material is a step of removing substances that interfere with the bonding between the base material and the dissimilar metals during sintering such as various organic substances, foreign matter and dust on the surface of the base material, and it is wiped with a cleaning agent or wiped with a steam brush or the like. On the other hand, it is preferable to use an iron-based alloy as the base material.

In the present invention, a hard metal alloy powder and a soft pure metal powder are mixed to prepare a metal powder.

In the present invention, the hard copper alloy powder is composed of 85 to 95% of brass (Cu-Zn) powder and 5 to 12% of bronze (Cu-Sn) powder in terms of% by weight based on the mixed metal powder.

It is preferable that the composition of the alloy powder contains the brass powder in the range of 85 to 95% by weight, more preferably 90 to 92% by weight. When the content of the brass powder is increased, the mechanical strength of the coating layer is improved. When the content is too high, the hardness of the brass powder accelerates the wear of the contact parts to be contacted, The hardness is so low that the copper alloy coating layer is easily worn. The brass powder preferably contains zinc (Zn) in a range of 15 to 20%.

On the other hand, the bronze powder serves to increase the strength of the coating layer, and the content thereof is in the range of 5 to 12%, more preferably 5 to 5.8%.

In the present invention, the bronze powder preferably contains tin (Sn) in a range of 7 to 12%.

Further, the bronze powder is preferably phosphor bronze (Cu-Sn-P) powder. At this time, the content of phosphorus (P) is preferably 0.1% or less, more preferably 0.05% or less. This phosphorus (P) improves the sintering atmosphere by reducing the oxygen in the sintering furnace during sintering and reduces the evaporation of the alloying element having a low boiling point during the sintering process, thereby facilitating the control of the zinc component, The sintered coating layer can exhibit high friction characteristics and wear resistance because the solubility of tin (Sn) is increased and the mechanical properties are increased. However, when phosphorus is added in an excessive amount, the physical properties of the coating layer are weakened and the strength of the coating layer is lowered.

In the present invention, the soft pure metal powder may include 0.01 to 5% of copper powder, 0.01 to 5% of aluminum powder, 0.01 to 5% of silicon powder, titanium powder, 0.01 to 5% iron powder, 0.01 to 5% nickel powder, 0.01 to 5% nickel powder, 0.01 to 5% manganese powder and 0.01 to 5% cobalt powder And may be made of at least one kind of pure metal powder.

That is, in the present invention, the soft metal powder such as Cu, Al, Si, Ti, Fe, Ni, Mn, Powder is mixed with hard alloy powder to form a soft phase in a high strength core to increase friction force and instantaneous bonding force to improve friction coefficient and abrasion resistance and to have a content of 0.01 to 5% , And more preferably from 0.1 to 2.0%. If the content of the soft pure metal powder is less than 0.01%, the effect of correcting the friction coefficient by the formation of the soft phase is not exhibited. If it exceeds 5%, the soft phase is formed excessively in the periodic paper, ≪ / RTI >

If the average particle diameter is less than 0.5 탆, it is difficult to control the friction coefficient. If the average particle diameter is more than 50 탆, it may cause breakage due to defects at the interface and local softening It is possible to cause a reduction in abrasion resistance caused by the abrasion resistance.

In the present invention, it is preferable to further include a silver (Ag) powder.

In the present invention, the silver (Ag) powder improves the strength and increases the thermal conductivity, thereby enhancing the cooling ability of the worm wheel, the bearing, the slipper for the compressor, and other high-speed motion parts for automobile transmission parts and general machines, It plays a role. In the present invention, the ratio of the silver (Ag) powder is preferably 0.01 to 5%, more preferably 0.1 to 0.5%.

Subsequently, in the present invention, the mixed metal powder is laminated on the surface of the metal base material.

That is, the hard alloy powder and the soft pure metal powder to be used as a double or multi-structure covering material are quantitatively and mixed so as to have a uniform composition to prepare a metal powder, and then a metal powder to form a coating layer on the surface of the washed metal base material And laminated to a uniform thickness.

In the present invention, the metal base material in which the metal powder is laminated is maintained at 700 to 900 ° C for 10 to 40 minutes to uniformly distribute the soft pure metal phase on the hard alloy, integrate the metal powder into the metal base material, .

That is, the alloy powder and the metal powder forming the soft phase are uniformly stacked on the surface of the metal base material, and then the mixture is put into a continuous sintering furnace or a general furnace, and is sintered for a predetermined time. In this sintering step, the metal base material and the metal powder are bonded to each other by applying high temperature heat to the base material in which the alloy powder and the metal powder formed in the soft phase are laminated in a protective atmosphere so that the powder is not oxidized.

Preferable conditions for carrying out such a sintering process are sintering temperature: 700 to 900 占 폚, sintering time: 10 to 40 minutes, atmosphere: reducing atmosphere.

At this time, in the present invention, when sintering under the protective gas atmosphere using the base material in which the alloy powder and the metal powder forming the soft phase are uniformly laminated, the metal element (Zn) having a low boiling point during the sintering process is evaporated, It is possible to maintain the composition ratio of the alloy powder and the soft metal powder composition even after sintering. In addition to uniformly forming the metal powder coating layer, it also improves the mechanical properties of the sintered coating layer by creating a good interfacial bonding force, thereby improving the friction characteristics of worm wheels and bearings, slippers for compressors and other high- The durability can be greatly improved.

On the other hand, FIG. 2 (a) shows a double or multi-structure high-strength wear-resistant alloy having a coating layer uniformly distributed in a soft phase of a pure metal powder in a matrix structure using the hard alloy powder of the present invention, Fig. 2 is a schematic view showing a cross section of a microstructure.

The method may further include a step of integrating the coating layer into the base metal preform and then maintaining the coating layer at 300 to 600 DEG C for 10 to 40 minutes in a reducing atmosphere. As a result, the coating layer may have high strength, abrasion resistance, The instantaneous bonding force can be effectively controlled.

In the present invention, a mechanical part of a predetermined shape is manufactured by molding the metal base material in which the coating layer is integrated. When sintering is completed in the above-described sintering process, the sintered body is taken out from the sintering furnace and put into a molding die. By applying a multi-step gradual molding process, worm wheels and bearings for slippage and bearings for compressors, Completes high-speed motion parts. That is, since the sintered coating layer can be prevented from being damaged during the molding of the component by molding using the multi-step gradual molding process, it is possible to prevent the deterioration of the characteristics due to the sintered coating layer damage.

 In the present invention, as a method for preventing the damage of the sintered copper alloy layer in the manufacturing process of the worm wheel and bearing, the slipper for the compressor, and other high-speed moving parts for automobile transmission parts or general machinery having double structure or multiple structure, And a molding method using a molding process is proposed. If the sintered body having a dual structure or multiple structures is molded after the sintered layer protection treatment in each molding step, the sintered layer can be preserved in its original state even after the completion of the process. That is, when the sintered layer is preserved in a circular shape without damage after completion of the process, high mechanical properties and physical properties are maintained, so that a high-quality and high-performance double-structure or multi-structure transmission parts for automobiles, worm wheels and bearings, It is possible to manufacture general machine parts such as other high-speed motion parts.

In the present invention, after the above-described molding step, a heat-treating step for imparting mechanical properties of the manufactured parts can be additionally provided.

Hereinafter, the present invention will be described in detail by way of examples.

(Example)

Metal base material composition (% by weight) C Si Mn P S Fe Metal base material 0.32 to 0.38 0.15-0.35 0.60 to 0.90 0.03 or less 0.035 or less Remainder

division
Composition (% by weight) of metal powder (hard alloy powder + soft metal powder) Weight loss (10000 rpm)
Cu-Zn Cu-Sn Al Si Al ₂ O ₃ Ag Mn Fe Pb Ni Co Ti Cu Zn Sn SiO ₂ Inventory 1 92.0 5.0 3.0 25 mg Inventory 2 93.0 5.0 2.0 28 mg Inventory 3 93.0 5.0 2.0 37 mg Honorable 4 94.0 5.0 1.0 32 mg Inventory 5 92.0 5.0 3.0 27 mg Inventory 6 93.0 5.0 2.0 28 mg Honorable 7 93.0 5.0 2.0 3.0 40 mg Honors 8 91.0 5.0 1.0 3.0 33 mg Proposition 9 90.0 5.0 3.0 2.0 34 mg Inventory 10 91.0 5.0 2.0 2.0 39 mg Comparative Example 1 Remainder 15.0 5.0 52 mg Comparative Example 2 8.0 5.0 8.0 3.5 0.1 5.0 0.1 0.05 33.0 Remainder 3.0 48 mg Comparative Example 3 6.0 1.5 22 6.0 Remainder 30 5.5 1.5 42 mg

The contaminants existing on the surface of the iron-based metal base material having the composition components shown in Table 1 were washed. Next, the alloy powder having the composition as shown in Table 2 and the metal powder forming the soft phase were quantified and mixed so as to have a uniform composition, and then they were laminated on the surface of the metal base material to have a uniform thickness. The sintering was carried out at a sintering temperature of 870 ° C., a sintering time of 20 minutes, and an atmosphere of 75% N ₂ +. The sintering was carried out by sintering the metal base material, It was controlled by 25% H ₂ reducing atmosphere. After the sintering was completed, the sintered body was taken out from the sintering furnace, and then put into a molding die, and then a multi-step gradual molding step was applied to manufacture an automotive transmission part. The frictional coefficient and the weight loss were measured after 10,000 rpm at 1500 rpm and 75 kgf of the motor using the friction coefficient measuring equipment to evaluate the frictional characteristics of the manufactured automobile transmission parts in contact with the relative member.

In the case of the automotive transmission components of the present invention 1-10, the coefficient of friction was about 0.09 level after rotation at the initial 0.12 level, satisfying the friction coefficient range of 0.08 to 0.12 required for the automotive transmission parts.

     In addition, the weight loss after the abrasion test of the present invention 1-10 in which the soft phase powder forming the soft phase was added in the periodic structure made of the alloy phase was measured, and the results are shown in Table 2 above.

As shown in Table 2, Example 1 in which copper powder (Cu powder) uniformly distributed in the phase of the alloy powder was uniformly distributed in the phase of the alloy powder had a weight loss of 25 mg, and silicon (Si) was used as the soft phase forming metal powder. The added Example 2 was measured to be 28 mg. Example 3 in which aluminum (Al) was added as a metal powder forming a ductile phase was measured to be 37 mg, and 32 mg of powder 4 in which silver (Ag) was added, weight of Inventive Example 5 added with iron (Fe) A reduction amount of 27 mg, and a weight loss of 28 mg of Example 6 in which nickel (Ni) was added was measured.

Meanwhile, Inventive Example 7 in which two or more kinds of soft phase forming metal powders of aluminum (Al) and manganese (Mn) were added was measured to be 37 mg, Inventive Example 8 to which silver (Ag) and titanium (Ti) Weight reduction amount of Example 9 in which Fe and Cu were added was 34 mg and weight loss of 39 mg in Inventive Example 10 to which nickel (Ni) and cobalt (Co) were added was measured

That is, when a high-strength alloy powder forms a matrix and a metal powder forming a soft phase is mixed and sintered in a cycle, the soft phase is uniformly distributed in the cycle, and the periodic bond and the momentary bond strength It is possible to provide a high friction property and wear resistance by significantly reducing the weight loss.

On the contrary, Comparative Example 1 showed a problem of low wear resistance due to a low zinc (Zn) content. The weight loss of Comparative Example 1 was 52 mg, that of Comparative Example 2 was 48 mg, that of Comparative Example 3 was 42 mg Which shows a weight reduction amount higher than the weight reduction amount of the present invention 1-10 of 25 to 40 mg.

While the present invention has been particularly shown and described with reference to exemplary embodiments, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, Of course, this is possible. Therefore, the scope of the present invention should not be limited to the above-described embodiments but should be defined by the following claims as well as equivalents thereof.

Claims (9)

Preparing a metal base material;
Mixing a hard copper alloy powder and soft pure metal powder to prepare a metal powder;
Laminating the mixed metal powder on the surface of the metal base material;
The metal base material in which the metal powder is laminated is maintained at 700 to 900 DEG C for 10 to 40 minutes in a reducing atmosphere to uniformly distribute the soft pure metal phase on the hard alloy and integrate the metal powder into the metal base material, ; And
And a step of forming a mechanical part of a predetermined shape by molding the metal base material in which the coating layer is integrated,
By weight based on the mixed metal powder,
The hard alloy powder is composed of 85 to 95% of brass powder and 5 to 12% of bronze powder,
The soft pure metal powder may contain 0.01 to 5% of copper (Cu) powder, 0.01 to 5% of aluminum powder, 0.01 to 5% of silicon powder, 0.01 to 5% of titanium powder, At least one selected from the group consisting of: 0.01 to 5% of iron (Fe) powder, 0.01 to 5% of nickel (Ni) powder, 0.01 to 5% of manganese (Mn) powder and 0.01 to 5% of cobalt Wherein the friction material has a high friction coefficient and a high abrasion resistance.
The method of claim 1, wherein the brass powder comprises zinc (Zn) in a range of 15 to 20%.
The method of claim 1, wherein the bronze powder comprises tin (Sn) in a range of 7 to 12%.
The method of claim 1, wherein the bronze powder is phosphor bronze powder (Cu-Sn-P) powder.
5. The method according to claim 4, wherein the phosphorus contained in the phosphor bronze powder has a P content of 0.1% or less.
The method according to claim 1, wherein the soft, pure metal powder has an average particle diameter of 0.5 to 50 탆.
The method according to claim 1, wherein the soft pure metal powder further comprises silver (Ag) in a range of 0.01 to 5.0%.
The method according to claim 1, further comprising a step of integrating the coating layer on the base metal preform and then maintaining the coating layer at 300 to 600 DEG C for 10 to 40 minutes in a reducing atmosphere, A method of manufacturing a mechanical member.
The method according to claim 1, wherein a multi-step gradual molding process is used in the forming step. A method for manufacturing a friction material having a layered structure excellent in high friction coefficient and abrasion resistance.

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