JP3325033B2 - Multi-layer sintered sliding member and manufacturing method thereof - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a multi-layer sintered sliding member in which a sintered alloy layer containing copper as a main component and containing at least 3% by mass of graphite as a lubricating substance is integrally joined on a steel plate. More specifically, the present invention relates to a multilayer sintered sliding member in which an aluminum-bronze-based alloy layer containing at least 3% by mass or more of graphite as a lubricating substance dispersed on a steel plate via a bonding layer is integrally bonded, and a method for producing the same. It is.

[0002]

2. Description of the Related Art Conventionally, a multi-layer sintered sliding member in which a copper-based sintered alloy layer containing graphite dispersedly contained as a lubricating substance is integrally joined to a thin steel plate is disclosed in, for example, Japanese Patent Publication No. 54-29661.
It is publicly known from Japanese Patent Publication No. This multilayer sintered sliding member is widely used as a so-called wound bush, which is wound with the sintered alloy layer inside to form a cylindrical shape.

[0003] In the above-mentioned sliding member, since the sintered alloy layer forming the sliding surface is integrally joined to the thin steel plate, the range of use is naturally limited, and in a severe application where an impact load or a high load acts, It cannot be applied as it is.

[0004] In order to enable application to severe applications such as the above-mentioned impact load, the present applicant has previously published Japanese Patent Publication No. 56-122.
No.88 was proposed. That is, Japanese Patent Publication No. 56-12288
No. 2 is a multi-layer steel sheet formed by applying a slip layer of a sintered alloy mainly composed of copper dispersed and containing at least 3% by weight or more as a lubricating substance on a steel sheet, and the multi-layer steel sheet is prepared separately. Is a multi-layer sintered sliding member integrally joined to a finished steel plate via a phosphor bronze thin plate, and discloses, as a specific example, phosphor bronze or lead bronze containing graphite dispersedly as a sintered alloy sliding layer. .

[0005]

SUMMARY OF THE INVENTION The above Japanese Patent Publication No. 56-12
Although the sintered sliding material disclosed in Japanese Patent No. 288 has improved load-bearing performance as compared with the above-described sliding member, the sliding of the sintered alloy layer is not suitable for severe applications such as impact load. It was not satisfactory in terms of properties and mechanical properties. The performance of this type of sintered sliding member depends on the sliding properties such as lubrication and abrasion resistance of the sintered alloy layer integrally joined to the steel plate, and the mechanical properties such as the strength and hardness of the sintered alloy layer. It depends on the properties and further on the bonding property between the sintered alloy layer and the steel sheet.

The present inventors have focused on aluminum bronze widely used for sliding members, and joined a sintered alloy layer made of this aluminum bronze onto a steel plate integrally, thereby obtaining severe impact load and the like. We thought that it would be possible to apply it to various uses, and conducted intensive research.

[0007] However, during the course of the research, it was found that the sinterability of aluminum bronze and the integral joining on a steel sheet were extremely difficult. That is, since the aluminum powder or the alloy powder containing aluminum has a thermally stable alumina (Al ₂ O ₃ ) film on the surface layer of the powder, the flow of the liquid phase of aluminum at the time of sintering is hindered and the sintering proceeds. Or in a neutral or reducing atmosphere, the alumina coating remains to the end and weakens the bonds between the particles.

[0008] The inventors of the present invention set the technical problem of the sinterability of aluminum bronze and the difficulty of integral joining on a steel sheet, which were found in the above-mentioned research process. Incorporating titanium, the alumina film on the surface of the aluminum powder was broken during the sintering process, enabling sintering and interposing a bonding layer to enable integrated bonding on the steel plate. . The present invention has been made based on the above findings, and is a multilayer sintered sliding member in which a sintered alloy layer made of aluminum bronze containing graphite dispersedly contained as a lubricating substance is integrally joined to a steel sheet via a joining layer. And a method for producing the same.

[0009]

In order to achieve the above object, the present invention employs the following means. That is, a first object of the present invention is to provide aluminum of 5 to 13% by mass and iron of 3 to 6%.
5 to 10% by mass of tin, 5 to 10% by mass of tin, and 0.1 to 1.5% by mass of a titanium component of titanium hydride. An object of the present invention is to provide a multi-layer sintered sliding member integrally joined via a phosphor bronze joining layer of 1 to 1.0% by mass, the balance being copper.

A second object of the present invention is to provide a method for manufacturing the above-mentioned multilayer sintered sliding member.

Further, the multi-layer sintered sliding member of the present invention can be applied as an oil-containing multi-layer sintered sliding member by subjecting it to an oil-impregnating treatment in accordance with the intended purpose and application.

In the multilayer sintered sliding member having the above-mentioned composition, the graphite (C) component is dispersed and contained in the sintered structure to perform a solid lubrication function. A loading of at least 3% by weight is required. However, if the content exceeds 8% by mass, the mechanical strength of the sintered alloy layer is impaired and the sinterability is reduced.
The upper limit of the amount is 8% by mass. Therefore, the compounding amount of the graphite component is suitably 3 to 8% by mass, especially 4 to 6% by mass.

The aluminum (Al) component generates a liquid phase during the sintering process, and diffuses into the copper (Cu) component, which is the main component, to form a solid solution, which contributes to the improvement of the hardness and strength of the sintered matrix. When the content is less than 5% by mass, the above-mentioned effects are not observed. When the content exceeds 13% by mass, the hardness of the sintered matrix is increased, but at the same time, the brittleness is increased, and the strength of the sintered alloy layer is increased. Will be weakened. Therefore, the amount of the aluminum powder is 5-13.
% Is suitable, especially 8 to 10% by weight.

The iron (Fe) component makes the sintered matrix finer and contributes to improving the strength of the sintered matrix. And when the compounding amount is 3% by mass or less, the effect is not recognized,
Also, if the content exceeds 6% by mass, the strength of the sintered matrix is reduced. Therefore, the compounding amount of the iron component is suitably 3 to 6% by mass, especially 4 to 6% by mass.

The titanium hydride (TiH ₂ ) component has the effect of reducing the alumina film on the surface of the aluminum powder with hydrogen to enhance the sinterability. Titanium also has the effect of making the crystals of the sintered matrix finer and increasing the strength and hardness of the sintered matrix. If the compounding amount is 0.1% by mass or less as a titanium component, no effect is exhibited in improving the above-described sinterability and strength.
If the amount is more than 5% by mass, the dispersion ratio in the sintered matrix becomes excessive, and the strength is lowered. Therefore, the compounding amount of titanium hydride is 0.1 to 1.5% by mass as a titanium component, preferably 0.2 to 1.0% by mass.
Is appropriate.

3% by mass based on the above-mentioned composition.
The following nickel (Ni) component and 1% by mass or less of manganese (Mn) component can be blended. By mixing the nickel component and the manganese component, the strength of the sintered matrix can be improved.

The mixed powder having the above-described component composition is sintered via a bonding layer made of phosphor bronze formed on a back metal made of a steel plate in advance, and is joined and integrated on the back metal as a sintered sliding layer. You. Phosphor bronze forming the bonding layer is tin 5-10.
% By mass, phosphorus by 0.1 to 1.0% by mass, the balance being copper.

Hereinafter, a method for manufacturing a multilayer sintered sliding member will be specifically described.

The steel plate as the back metal forming the multilayer sintered sliding member is a rolled steel plate for general structure (JIS-G-3101).
Is used.

The bonding layer formed on the steel sheet includes:
In the present invention, a mixed powder composed of 5 to 10% by mass of tin, 0.1 to 1.0% by mass of phosphorus and the balance of copper is used, and (1) a method of spraying the mixed powder to a uniform thickness on a steel plate surface. (2) a method in which the mixed powder is formed as a coating on the surface of the steel sheet by flame spraying or plasma spraying; (3) a mixed powder forming the sliding layer and a mixed powder forming the bonding layer are rolled into two layers. A method of forming a rolled sheet is used.

[First Production Method] Aluminum 5 to 13% by mass, iron 3 to 6% by mass, graphite 3
~ 8 mass%, 0.1 ~ as titanium component of titanium hydride
1.5 mass%, mixed powder consisting of the balance copper, or mixed powder further mixed with 3 mass% or less of nickel and 1 mass% or less of manganese,
A 5% by mass aqueous solution is added in an amount of 0.1 to 5.0% by mass with respect to the mixed powder, and the mixture is uniformly mixed to form a mixed powder for a sliding layer having wettability to the mixed powder.

Examples of powder binders that can be used include hydroxypropyl cellulose (HPC), polyvinyl alcohol (PVA), carboxymethyl cellulose (CMC), and hydroxyethyl cellulose (HE).
C), methylcellulose (MC), gelatin, gum arabic, starch and the like. Among them, HPC is preferred. As a solvent for the powder binder, water or an aqueous solution of a hydrophilic compound such as ethyl alcohol of 5 to 20% by mass in addition to water can be used.

It is preferable to add 1 to 15% by mass of the powder binder to the above solvent to make an aqueous solution. The addition ratio of the aqueous powder binder solution is preferably from 0.1 to 5.0% by mass with respect to the mixed powder. If the amount is more than that, uncontrollable pores (pores) increase in the sintered matrix, and The strength and wear resistance of the resulting sintered layer.

The wetted mixed powder is then supplied to a rolling roll by a conveyor and a hopper, and the roll is used to form the mixed powder into a rolled sheet (compacted sheet). For the rolling of the mixed powder, a horizontal rolling mill having twin rolls is used. If the supply amount of the mixed powder to the rolls of the horizontal rolling mill is kept constant, the rolling load changes by changing the roll gap, and the density and thickness of the rolled sheet can be adjusted. For example, if the roll speed is 0.1 to 1.0 m / min and the roll gap is 0.4 to 1.0 mm, the density is 5.5 to 6.7 g / min.
A rolled sheet having a cm ³ and a thickness of 1.38 to 1.83 mm is obtained.

As a backing metal, a rolled steel sheet for general structural use having a thickness of 10 to 20 mm is prepared, and a mixed powder comprising 5 to 10% by mass of tin, 0.1 to 1.0% by mass of phosphorus, and the balance copper is provided on the surface of the steel plate. And a bonding layer having a uniform thickness of 0.3 to 0.7 mm is formed by rolling.

The rolled sheet is superimposed on the joining layer having a uniform thickness formed on the surface of the steel sheet, and the rolled sheet is placed in a heating furnace adjusted to a neutral or reducing atmosphere. At the same time as the sintering of the sheet, the rolled sheet is joined to the steel sheet via the joining layer, and a multilayer sintered sliding member integrally joined to the steel sheet via the joining layer is obtained.

[Second Manufacturing Method] A rolled sheet is obtained in the same manner as in the first method. As the back metal, a steel sheet similar to that of the first method is prepared, and tin 5 to 10% by mass, phosphorus 0.1 to 1.0% by mass,
The mixed powder consisting of the remaining copper is flame-sprayed or plasma-sprayed to form a bonding layer of 0.3 to 0.7 mm. The rolled sheet is superimposed on the thermal sprayed bonding layer formed on the surface of the steel sheet, and placed in a heating furnace adjusted to a neutral or reducing atmosphere. The rolled sheet is joined to the steel sheet via the layer, and a multilayer sintered sliding member integrally joined to the steel sheet via the joining layer is obtained.

[Third Production Method] The mixed powder for the sliding layer and the mixed powder for the bonding layer are prepared, and the mixed powder for the sliding layer is prepared from one roll side of the horizontal rolling mill.
The mixed powder for the joining layer is supplied from the other roll side to form a two-layer rolled sheet in which the mixed powder for the sliding layer and the mixed powder for the joining layer are integrated. The mixed powder for the bonding layer is composed of a mixed powder composed of 5 to 10% by mass of tin, 0.1 to 1.0% by mass of phosphorus, and the balance of copper, and an aqueous solution of 1 to 15% by mass of a powder binder added to the mixed powder. 1 to 5.0% by mass is added and uniformly mixed to give wettability to the mixed powder.

The method for producing the two-layer rolled sheet will be described more specifically. FIG. 1 shows a manufacturing apparatus (horizontal rolling mill), wherein reference numeral 1 denotes a twin roll, 2 denotes a load cell disposed on one roll side, 3 denotes a fluid cylinder disposed on the other roll side, Is a hopper, 5 is a partition plate which bisects the inside of the hopper 4, and is extended between twin rolls 1, 6 is a mixed powder supply conveyor for a sliding layer, 7 is a mixed powder supply conveyor for a bonding layer, and 8 is a two layer It is a rolled sheet.

The hopper 4 bisected by the partition plate 5
The mixed powder for the sliding layer and the mixed powder for the bonding layer are supplied from the conveyors 6 and 7, respectively. The mixed powder supplied to the hopper 4 is supplied between the twin rolls 1 and rolled between the rolls to form a two-layer rolled sheet in which the mixed powder for the sliding layer and the mixed powder for the joining layer are integrated. 1.4 to 1.8 mm on the sliding layer side and 0.3 to 0.3 mm on the joining layer side of the two-layer rolled sheet.
It is molded to a thickness of 0.7 mm.

This two-layer rolled sheet is overlaid on the same steel plate as in the first method, with a layer made of the mixed powder for a bonding layer facing the steel sheet, and adjusted to a neutral or reducing atmosphere. In the heating furnace, and sintering the rolled sheet on the sliding layer side under pressure and simultaneously bonding the rolled sheet to the steel sheet through the bonding layer, and integrally forming the bonding sheet on the steel sheet through the bonding layer. To obtain a multilayer sintered sliding member.

In the sintering step in the first, second, and third manufacturing methods described above, the pressure during sintering increases the density of the sintered matrix, and causes the sintering layer and the steel sheet to pass through the bonding layer. The purpose of the present invention is to improve the bonding strength.
５5.0 kgf / cm ² , preferably 0.3-3.0 k
gf / cm ² .

The sintering temperature has a sensitive effect on the sintering matrix, and special attention must be paid to temperature control. In the present invention, the temperature is 800 to 950 ° C, preferably 850 to 900
Performed in the range of ° C. The sintering time does not affect the sintering matrix as sensitively as the sintering temperature, but does affect the mechanical strength of the sintered layer. In the present invention, good results are obtained in the range of 30 to 60 minutes.

As the neutral or reducing atmosphere, ammonia decomposition gas, nitrogen gas, endothermic gas and the like are used.

The multi-layer sintered sliding member obtained by the above-described manufacturing method produces a liquid phase in the component of the bonding layer simultaneously with the sintering of the rolled sheet during pressure sintering, and this liquid phase is formed on the surface of the steel sheet and the rolled sheet. Is joined to the steel sheet via the joining layer of the sintered layer made of the rolled sheet.

The multi-layer sintered sliding member thus obtained can be applied as an oil-containing multi-layer sintered sliding member by subjecting the sintered layer to an oil-impregnating treatment according to the intended purpose and application. is there. In the oil-containing multi-layer sintered sliding member, the solid lubricating action of graphite in the sintered matrix and the synergistic effect of lubricating oil are exhibited.

[0037]

The titanium hydride in the component forming the sintered alloy layer breaks the alumina film on the surface of the aluminum powder during sintering, thereby enabling sintering of aluminum bronze which has been considered difficult. Further, the titanium of the titanium hydride makes the crystal of the sintered matrix finer to increase the strength and hardness of the sintered matrix, and can be applied to an impact load or a high load application.

[0038]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail based on embodiments. <Example 1> 10% by mass of atomized aluminum powder passing through 325 mesh, 3% by mass of reduced iron powder passing through 240 mesh, and 0.25 as a titanium component of titanium hydride powder in electrolytic copper powder passing through 200 mesh. % By mass and mixed with a V-type mixer for 20 minutes.
5 mass% of natural graphite powder of 50 mesh was blended, and V
The mixture was mixed for 5 minutes using a mold mixer to obtain a mixed powder [Al:
10, Fe: 3, TiH ₂ (Ti: 0.25), C:
5, Cu: 81.75].

An aqueous solution of 5.26% by mass of HPC (100 g of HPC, 120 ml of ethyl alcohol and 1780 ml of water) was added to the mixed powder in an amount of 0.5% by mass based on the mixed powder, and the mixture was uniformly mixed with a V-type mixer for 5 minutes. A wettable mixed powder for a sliding layer was obtained.

The mixed powder was passed through a horizontal rolling roll having twin rolls having a diameter of 603 mm with a roll gap of 0.5 mm and a roll speed of 0.3 m / min to obtain a density of 5.70 g.
/ Cm ³ , and a rolled sheet (compacted sheet) having a thickness of 1.48 mm were formed.

As a steel plate, width 170 mm, length 600 m
A rolled steel sheet for general structural use having a thickness of 10 mm and a thickness of 10 mm is prepared, and a mixed powder composed of 7% by mass of tin powder, 0.7% by mass as a phosphorus component of a copper-phosphorus alloy powder and the balance of copper powder is provided on the surface of the steel plate. The mixture was sprayed uniformly, and a bonding layer having a thickness of 0.3 mm was formed by applying a roller.

The rolled sheet is 170 mm in width and 60 in length.
The sheet was cut to a size of 0 mm, and two rolled sheets were overlaid on the joining layer of the steel sheet on which the joining layer was formed. Then, this was placed in a heating furnace in an ammonia decomposition gas atmosphere at a temperature of 900 ° C. for 60 minutes, and a pressure of 1.5 kgf / cm.
^{After the} sintering of the rolled sheet and the joining of the rolled sheet with the steel sheet via the joining layer are simultaneously performed while applying the pressure, the workpiece is machined to a desired size, and then the steel sheet is joined to the steel sheet via the joining layer. A multilayer sintered sliding member in which the sintered layers were integrally joined was obtained. The density of the sintered layer of this multilayer sintered sliding member is 5.3 g.
/ Cm ³ , and the bonding strength between the steel sheet and the sintered layer is 7 kg.
/ Cm ² . The multilayer sintered sliding member was subjected to an oil impregnation treatment to obtain an oil impregnated multilayer sintered sliding member having an oil content of 20% by volume.

Example 2 A rolled sheet having a thickness of 1.48 mm was obtained in the same manner as in Example 1. 170m in width as in Example 1 as a steel plate
A rolled steel sheet for general structural use having a length of 600 mm and a length of 600 mm and a thickness of 10 mm is prepared. On the surface of the steel sheet, 7 mass% of tin powder, 0.7 mass% as a phosphorus component of the copper-phosphorus alloy powder and the balance of copper powder are used. The resulting mixed powder was plasma sprayed under the following conditions. [Plasma spraying conditions] (1) Spray gun Plasma spray gun (2) Operating current 500A (3) Voltage 30V (4) Arc gas argon 50 l / min (5) Powder gas argon 7.5 l / min (6) Powder supply amount 35 g A sprayed coating of a mixed powder consisting of 7% by mass of tin, 0.7% by mass of phosphorus and the balance of copper having a thickness of 0.3 mm was formed on a steel plate under the above-mentioned spraying conditions.

The rolled sheet is 170 mm in width and 60 in length.
The rolled sheet was cut to a size of 0 mm, and two rolled sheets were superimposed on the thermal sprayed steel sheet. Then, this is placed in a heating furnace in an ammonia decomposition gas atmosphere at a temperature of 900 ° C. for 60 minutes, and while applying a pressure of 1.5 kgf / cm ² , the sintering of the rolled sheet and the thermal spray coating (joining layer) of the rolled sheet are performed. After joining with the steel sheet through the joint at the same time, processed to the desired dimensions by machining, to obtain a multilayer sintered sliding member in which the sintered layer was integrally joined on the steel sheet via the joining layer Was. The density of the sintered layer of this multilayer sintered sliding member was 5.3 g / cm ³ , and the bonding strength between the steel sheet and the sintered layer was 7 kg / cm ² . The multi-layer sintered sliding member was subjected to oil impregnation treatment to obtain an oil-impregnated multi-layer sintered sliding member having an oil content of 20% by volume.

<Example 3> A hopper divided into two parts by a partition plate under the conditions of a roll gap of 0.7 mm, a roll speed of 0.1 m / min, and a roll load of 88 tons using the horizontal rolling mill shown in FIG. In the same manner, a mixed powder having the same wettability as in Example 1 for a sliding layer, a tin powder of 7% by mass, a phosphorus component of a copper-phosphorus alloy powder of 0.7% by mass and a balance of copper powder was used. Wet joint formed by mixing 5.26% by mass of an aqueous solution of HPC (100g of HPC, 120ml of ethyl alcohol and 1780ml of water) with 0.5% by mass of the mixed powder and uniformly mixing with a V-type mixer for 5 minutes. The mixed powder for layers was charged to form a two-layer rolled sheet. The thickness of the obtained two-layer rolled sheet is 2.0 mm, and 1.68 is provided on the sliding layer side.
mm and 0.32 mm on the bonding layer side.

The two-layer rolled sheet was cut into a size of 170 mm in width and 600 mm in length, and was laminated with the joining layer side facing the steel sheet. Hereinafter, sintering was performed under the same conditions as in Example 1, processed to a desired size by machining, and a multi-layer sintered sliding member in which the sintered layer was integrally joined to the steel sheet via the joining layer was obtained.
The density of the sintered layer of this multilayer sintered sliding member is 5.1 g / cm.
³ , and the bonding strength between the steel sheet and the sintered layer was 8 kg /
cm ² . The multi-layer sintered sliding member was subjected to an oil impregnation treatment to obtain an oil-containing multi-layer sintered sliding member having an oil content of 23% by volume.

Example 4 10% by mass of atomized aluminum powder passing through 325 mesh and 3% by mass of reduced iron powder passing through 240 mesh in electrolytic copper powder passing through 200 mesh and 250%
3% by weight of electrolytic nickel powder passing through the mesh and 200
A mixture of 1% by mass of manganese powder passing through the mesh and 0.5% by mass as a titanium component of the titanium hydride powder was added.
After mixing for 20 minutes in a mold mixer, 5% by mass of natural graphite powder of 48 to 250 mesh was blended and mixed again in a V-type mixer for 5 minutes to obtain a mixed powder [Al10, Fe
_{3, Ni3, Mn1, TiH 2} (Ti: 0.5), C
5, Cu77.5].

An aqueous solution of 5.26% by mass of HPC (100 g of HPC, 120 ml of ethyl alcohol and 1780 ml of water) was added to the mixed powder in an amount of 0.5% by mass based on the mixed powder, and uniformly mixed with a V-type mixer for 5 minutes. A wettable mixed powder for a sliding layer was obtained.

Then, the mixed powder for the sliding layer and the mixed powder for the bonding layer as in Example 3 were loaded into the hopper divided into two parts by the partition plate in the same manner as in Example 3, and the two layers were rolled. A sheet was formed. The thickness of the obtained two-layer rolled sheet was 2.0 mm, 1.68 mm on the sliding layer side, and 0.32 mm on the joining layer side.

The two-layer rolled sheet was cut into a size of 170 mm in width and 600 mm in length, and was overlapped with the joining layer side facing the steel sheet. Hereinafter, sintering was performed under the same conditions as in Example 1, processed to a desired size by machining, and a multi-layer sintered sliding member in which the sintered layer was integrally joined to the steel sheet via the joining layer was obtained.
The density of the sintered layer of this multilayer sintered sliding member is 5.1 g / cm.
³ , and the bonding strength between the steel sheet and the sintered layer was 8 kg /
cm ² . The multi-layer sintered sliding member was subjected to an oil impregnation treatment to obtain an oil-containing multi-layer sintered sliding member having an oil content of 22% by volume.

Next, the sliding characteristics of the multilayer sintered sliding member obtained in each of the above-described examples were tested under the following conditions.

<Test conditions> (1) Load resistance test Load (surface pressure) 100 kgf / cm²Cumulative load every hour Speed 7m / min Stroke 80mm Counterpart material Gray cast iron (FC250) polished product Lubrication No lubrication (2) Endurance test Load (surface pressure) 90kgf / cm²  Speed 7m / min Stroke 80mm Counterpart material Gray cast iron (FC250) polished product Grease applied to sliding surface before lubrication test Durability 100,000 cycles

Under the above test conditions, the coefficient of friction and the amount of wear of the multilayer sintered sliding member of each example were measured. The test results are shown in Tables 1 and 2. The comparative examples in Tables 1 and 2 are the multi-layer sintered sliding members disclosed in the above-mentioned Japanese Patent Publication No. 56-12288, in which lead bronze containing 3% by mass of graphite in the sintered layer was used. It is. (Below)

[0054]

[Table 1] (Below)

[0055]

[Table 2]

From the test results shown in Table 1, the multi-layer sintered sliding member of each of the examples had a coefficient of friction of 0.15 or less and showed stable sliding throughout the test time. The wear amount of the sliding surface after the test was also excellent at 50 μm or less. Further, from the test results shown in Table 2, the multilayer sintered sliding members of the respective examples exhibited low values of the friction coefficient of 0.10 or less and low wear amounts of 5 μm or less. On the other hand, the multilayer sintered sliding member of the comparative example had a load of 200
The coefficient of friction gradually increases with the passage of kgf / cm ² ,
The test was stopped because the amount of wear also increased rapidly. Further, in the durability test, after 50,000 cycles of durability, the sliding became gradually unstable, and a sharp increase in both the friction coefficient and the wear amount was recognized. The wear amount in the table is a measurement result at a load of 200 kgf / cm ² in the load resistance test, and a measurement result at 70,000 cycles in the durability test.

[0057]

The multilayer sintered sliding member of the present invention has heretofore been considered difficult because titanium hydride in the components forming the sintered alloy layer destroys the alumina film of aluminum powder during sintering. Sintering of aluminum bronze. Also,
Since the titanium component of titanium hydride refines the crystal of the sintered matrix and increases the strength and hardness of the sintered matrix, the multilayer sintered sliding member of the present invention can be applied to impact load or high load applications. I do.

[Brief description of the drawings]

FIG. 1 is an explanatory view showing a horizontal rolling mill used for manufacturing a multilayer sintered sliding member of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Twin roller 4 Hopper 5 Divider 8 Double-layer rolled sheet

──────────────────────────────────────────────────続 き Continued on front page (51) Int.Cl. ⁷ Identification code FI C22C 9/02 C22C 9/02

Claims (12)

(57) [Claims] 1-5% by mass of aluminum, 3-6% of iron
5 to 10% by mass of tin, 5 to 10% by mass of tin, and 0.1 to 1.5% by mass of a titanium component of titanium hydride. A multilayer sintered sliding member, which is integrally joined via a phosphor bronze joining layer composed of 1 to 1.0% by mass and the balance being copper. 2. The multi-layer sintered sliding member according to claim 1, wherein the sintered alloy layer contains 3% by mass or less of nickel and 1% by mass or less of manganese. 3. The multi-layer sintered sliding member according to claim 1, wherein the sintered alloy layer contains a lubricating oil in a ratio of 18 to 25% by volume. 4. (1) 5 to 13% by mass of aluminum powder
Forming a mixed powder comprising 3 to 6% by mass of iron powder, 3 to 8% by mass of graphite powder, 0.1 to 1.5% by mass as a titanium component of titanium hydride powder and the balance of copper powder; )
To this mixed powder, an aqueous solution of a powder binder of 1 to 15% by mass is added in an amount of 0.1 to 5.0% by mass based on the mixed powder, and the mixture is uniformly mixed to obtain a mixed powder for a sliding layer. Supplying a roll to a rolling roll to form a rolled sheet; (3)
A steel sheet is prepared, and 5-10% by mass of tin and 0.1% of phosphorus are formed on the steel sheet.
Forming a bonding layer of phosphor bronze consisting of about 1.0% by mass with the balance being copper; and (4) superimposing the rolled sheet on a steel sheet via the bonding layer and bringing the sheet into a neutral or reducing atmosphere. 0.1 ~ at the temperature of 800 ~ 950 ℃ in the adjusted heating furnace
A step of sintering under a pressure of 5.0 kgf / cm ² for 30 to 60 minutes to simultaneously perform sintering of the rolled sheet and joining on a steel sheet; and steps (1) to (4) above. A method for producing a multilayer sintered sliding member, characterized by the following. 5. The mixed powder for a sliding layer includes nickel powder 3
The method for producing a multilayer sintered sliding member according to claim 4, wherein the content is not more than 1% by mass and not more than 1% by mass of manganese powder. 6. The multilayer sintered sliding member according to claim 4, wherein the powder binder is selected from hydroxypropyl cellulose, polyvinyl alcohol, carboxymethyl cellulose, hydroxyethyl cellulose, methyl cellulose, gelatin, gum arabic, and starch. Manufacturing method. 7. The bonding layer is composed of 5 to 10% by mass of tin and 0.1% of phosphorus.
The powder according to any one of claims 4 to 6, wherein a mixed powder composed of -1.0 mass% and a balance of copper is uniformly spread on the surface of the steel sheet to a thickness of 0.3 to 0.7 mm. A method for producing a multilayer sintered sliding member. 8. The bonding layer comprises 5 to 10% by mass of tin and 0.1% of phosphorus.
~ 1.0 mass%, mixed powder consisting of the balance copper is fired or flame sprayed on the surface of the steel sheet to a thickness of 0.3 ~
The method for producing a multilayer sintered sliding member according to any one of claims 4 to 6, which is formed as a coating having a thickness of 0.7 mm. 9. (1) 5 to 13% by mass of aluminum powder
Forming a mixed powder comprising 3 to 6% by mass of iron powder, 3 to 8% by mass of graphite powder, 0.1 to 1.5% by mass as a titanium component of titanium hydride powder and the balance of copper powder; )
Adding a 1 to 15% by weight aqueous solution of a powder binder to the mixed powder to the mixed powder in an amount of 0.1 to 5.0% by weight and uniformly mixing to form a mixed powder for a sliding layer; ) Tin 5
An aqueous solution of a powder binder of 1 to 15% by mass is added to a mixed powder of 10% by mass, 0.1 to 1.0% by mass of phosphorus, and the balance of copper, and 0.1 to 5.0% by mass of the mixed powder is added. (4) supplying the mixed powder for the sliding layer and the mixed powder for the bonding layer to a rolling roll;
Forming a two-layer rolled sheet in which the mixed powder layer for the sliding layer and the mixed powder layer for the bonding layer are integrated; and (5) setting the mixed powder layer for the bonding layer of the two-layer rolled sheet downward. At a temperature of 800 to 950 ° C. in a heating furnace adjusted to a neutral or reducing atmosphere at a temperature of 800 to 950 ° C.
a step of sintering under a pressure of kgf / cm ² for 30 to 60 minutes to simultaneously perform sintering of the rolled sheet and joining on a steel sheet; and steps (1) to (5) above. A method for producing a multilayer sintered sliding member. 10. The method for producing a multilayer sintered sliding member according to claim 9, wherein the mixed powder for the sliding layer contains 3% by mass or less of nickel powder and 1% by mass or less of manganese powder. 11. The multilayer sintered sliding member according to claim 9, wherein the powder binder is selected from hydroxypropyl cellulose, polyvinyl alcohol, carboxymethyl cellulose, hydroxyethyl cellulose, methyl cellulose, gelatin, gum arabic, and starch. Manufacturing method. 12. The mixed powder layer for a bonding layer of a two-layer rolled sheet has a thickness of 0.3 to 0.7 mm.
The method for producing a multilayer sintered sliding member according to any one of the preceding claims.