JPS6050856B2 - Method for producing metal composite material containing solid lubricant - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing a metal composite containing a solid lubricant.

The solid lubricant-containing metal composite material is aluminum (Al).
Using a single metal or alloy such as copper (Cu), tin (Sn), silver (Ag), or iron (Fe) as a base material (matrix), carbon (C), molybdenum disulfide (MoS0), or tungsten disulfide is added to it. (WS0) is a material that contains a solid lubricant such as (WS0), and when subjected to friction, a thin film layer of the solid lubricant is formed on the friction surface and exhibits self-lubricating properties.・In cases where it is not possible or undesirable to use liquid lubricants such as grease (e.g. food manufacturing machinery, chemical machinery, equipment used in special atmospheres such as high temperature, low temperature, vacuum, etc.) It is used as a material for oil-less bearings, as a constituent material for sliding electrical contacts and mating parts in various electrical equipment such as rotating electric machines, and as a material for other metal parts and components that require dry slipperiness.

1. In order to provide the objective characteristic of self-lubricity (low friction) at a high level and evenly in each part, the solid lubricant component is distributed evenly in the base metal. 2) The mechanical strength (
It is desirable that the material has as good a property as possible (hardness, wear resistance, compressive strength, shear strength, tensile strength, etc.).

Regarding 1) above, if the selected base metal and solid lubricant have the lubricating properties of a solid lubricant and are well fused to form an alloy structure, it is relatively easy to obtain a homogeneous material. It is possible, but in practice such cases are extremely rare and belong to special cases such as cast iron.

It is also possible to mechanically disperse and mix the molten solid lubricant or fine powder into the molten phase of the base metal (mechanically mixed structure alloy type), but this is difficult to achieve in a weightless environment such as outer space. However, under the action of gravity, it is actually impossible to mechanically disperse and mix the two phases due to poor wettability and large specific gravity difference between the base metal phase and solid lubricant phase, or strong stirring force is required. Even if it is possible to create a dispersed mixed phase state during stirring, phase separation will occur immediately after stirring is stopped, making it impossible to produce the product or making it extremely difficult to obtain good results. I can't do it.

Conventionally, this type of material was manufactured using powder metallurgy. It is built.

That is, a uniformly mixed powder containing base metal powder, solid lubricant powder, and auxiliary materials such as binders and antioxidants as needed is compacted, and this is then molded into base metal powder. It is sintered into a mass at a temperature below the melting point. The binder is specifically an organic powder such as pitch powder or plastic powder, which is added as a binder between raw material powders.
The binder is finally completely carbonized in the sintering process and becomes a solid lubricant component. However, although this powder metallurgy material has the desired property of lubricity, the mechanical strength of various metal systems is generally at a low level, and this point poses a problem in actual use. There is Yang He.

In other words, the mechanical strength of the powder metallurgy material varies, of course, depending on the type of base metal, and even within the same metal system, the proportion of raw material powder not mixed, particle size, compaction density, and sintering temperature, time, and atmosphere. Although the actual values vary due to differences in conditions such as 2) Furthermore, the sintering bonding force between the metal powders is inhibited and weakened by the presence of a solid lubricant; 3) No matter how high the density of the compacted compact is, it is microscopically is a porous body with pores between the metal powder particles and the solid lubricant powder particles, so when this powder compact is then heated and sintered, the air in each pore expands, and the solid lubricant powder particles expand. Because of this, the sintered body becomes fleshy with many microscopic cracks in each part of the body, and when 4 binders are used, the binder bonds with the metal, and The combustion gases generated during the process of carbonization contribute to the occurrence of cracks within the material;
As a result, various strength levels are generally low.

Therefore, in order to utilize this material more widely and effectively, it is strongly desired to develop a material with at least a generally higher level of mechanical strength. The purpose of the present invention is to meet the above-mentioned demands, and as a result of various experimental studies, it has been found that when using the newly developed melt sintering method described below, which is a process modification of powder metallurgy as a base process, solid lubrication is possible. It is now possible to easily mass-produce solid lubricant-containing metal composites with a high yield, in which the lubricant is substantially evenly distributed in the base metallurgical material, and which also has significantly higher mechanical strength levels than conventional powder metallurgy materials. After discovering what could be done, the present invention was completed.

That is, a substantially uniformly mixed powder containing base metal powder and solid lubricant powder as main components is compacted, and the compacted body is molded into a high-pressure and heat-resistant closed mold having a cavity of approximately the same shape as the compact. The sealed mold is fitted into the cavity with virtually no gaps and sealed, and the sealed mold is heated to a temperature higher than the melting point of the base metal of the powder compact to melt the base metal powder of the powder compact inside. The solid lubricant powder, which is present in a substantially uniformly dispersed state, is rapidly cooled and cooled in the mold before the viscosity decreases with the progress of melting of the base metal powder. This article summarizes a method for manufacturing a metal composite containing a solid lubricant, which is characterized by rapidly solidifying the contents of a solid lubricant and removing the solidified material from a mold. Ru.

The process will be explained in detail below.

(1) Particle size, mutual blending ratio, and other additives and auxiliaries of base metal powder (A1, Cu-Sn-N, Fe, etc.) and solid lubricant powder (C-MOS2, WS2, etc.) that are raw material powder materials , uniform mixing method, etc. are based on conventional powder metallurgy methods.

Generally, metal powder particles with a particle size of about 0.1 to 100 pm and solid lubricant powders of about 0.1 to 50 μm are used, and the blending ratio is determined based on the relationship with the desired lubricating performance.
(1) parts (parts by weight) of solid lubricant powder
Selected within the range of ~ (A). (2) Powder compaction A process in which the homogeneously mixed raw material powder is filled into a press mold and compressed (1 to 10 kg/CIL) to form a high-density compact.This process is also conventional. Conforms to powder metallurgy method.

This powder compaction can be performed in a vacuum atmosphere.

In other words, as mentioned above, no matter how densely compacted the powder compact is, microscopically it is a porous body with pores existing between the raw powder particles, and when compacting is performed in an air atmosphere, each pore is removed. Air is contained therein, and since the air pores are extremely fine and the pores are substantially independent, most of the air contained therein remains even if a vacuum suction removal process is performed afterwards. When the powder compact is heat-treated, the air contained therein expands and causes adverse effects such as cracks in the flesh of the product material, degrading the properties of the product material. Therefore, if compaction is carried out in a vacuum atmosphere, it is possible to obtain a powder compact that does not contain air within each void, although there are voids between the raw powder particles. Even if the molded product is subsequently stored in an air atmosphere, since the pores are extremely fine and the pores are substantially independent, air intrusion hardly occurs and there is no problem. Figure 1 shows an example of the vacuum atmosphere powder compacting machine.
Reference numeral 1 denotes a base plate, in the center of which a press mold 2 filled with raw material powder A1 is placed and set. 3 is a box with an open bottom.
The base plate 1 on which the pre-mold 2 is placed is moved up and down by a vertical movement mechanism (not shown), and when lowered, the lower flange 4 comes into close contact with the base plate surface via the airtight packing 5, and the base plate 1 is moved up and down. It becomes the bottom plate and the inside is made airtight.

6 is in such a relationship that when lowered by a breath rod inserted into a through hole 7 formed in the center of the top plate of the box 3 from above, the lower end just projects into the mold hole of the breath mold 2.

8 is an O-ring disposed to ensure airtightness between the peripheral surface of the breath rod and the through hole 7, and 9 is a vacuum pump connection port attached to the side surface of the case 3 so as to communicate with the inside and outside.

Then, the box 3 and the breath rod 6 are moved upward from the base plate 1 so that they are released, and the breath mold 2 filled with raw material powder is placed and set at a predetermined position on the base plate 1, and then the case is removed. 3 is lowered to make the inside of the box 3 airtight. In this case, the flange 4 of the box 3 is firmly connected to the base plate 1 with bolts 10 as required. Next, the vacuum pump P is operated to sufficiently reduce the pressure inside the box 3, and then the lower end of the press rod 6 is moved downward into the press mold 2, thereby compacting the raw material powder A1. be. After molding, the inside of the box 3 is returned to atmospheric pressure, the breath rod 6 is raised, the box 3 is also raised, the mold 2 is taken out, and the molded body A2 is punched out. (3) Melting and sintering/quenching The above compacted compact A2 is fitted and sealed with virtually no gaps in a high pressure-resistant and heat-resistant sealed cavity having a cavity 12 of approximately the same shape as the compact A2, as shown in the second diagram. Nasu.

The illustrated closed mold 11 consists of a medium-sized plate 13 in which a through hole 12 is formed as a cavity, and upper and lower lid plates 14 and 15 that sandwich the medium-sized plate and are tightened with bolts 1 and 6. It is made of steel. Hole surface of medium plate 13, lid body 1
4 and 15 are provided with inner surfaces of the middle plate 13 and the upper and lower lid plates 14 and 175 to facilitate release of the product from the mold after melting and sintering and quenching, and to resist the rise in internal pressure of the contents during melting and sintering. A smooth thin metal plate packing 17 having a melting point higher than the melting point of the raw metal powder and not alloyed with the raw metal powder is interposed or lined to seal the gap and prevent the contents from excessively protruding. (For example, in the case of Sn powder, use AI packing). Then, the powder compact A2 is stored and molded.
The closed mold 11 is placed in a high-temperature furnace and heated to form a powder compact A inside.
2. Melt the base metal powder. Next, in the present invention, due to the decrease in viscosity accompanying the progress of melting of this base metal powder,
Before the solid lubricant powder present in a substantially uniformly dispersed state substantially undergoes levitation due to the difference in specific gravity, the closed mold 1 is taken out of the furnace and immediately cooled down by placing it in water to remove the contents. solidify rapidly. That is, when the base metal powder of the powder compact A2 in the mold 11 starts to melt due to heating in the high-temperature furnace, and the viscosity decreases as the melting progresses due to the subsequent heating, each part of the powder compact becomes uniform. The solid lubricant powder existing in a uniformly dispersed state melts and the difference in specific gravity with the molten metal phase, which has a reduced viscosity, causes floating mobility and phase separation, disrupting the uniformly dispersing state. When the solid lubricant powder is heated and melted, the viscosity is still relatively high at the early stage of melting, and therefore the specific gravity difference of the solid lubricant powder does not substantially occur yet, and the uniformly uniform dispersion state is substantially maintained (metal powder (including a semi-molten state), the contents are taken out from the furnace and rapidly cooled to rapidly solidify the contents.

This makes it possible to obtain the solid lubricant powder-containing metal composite material A in which the solid lubricant powder is distributed substantially uniformly in each part. Therefore, in the method of the present invention, the timing of taking out the closed mold 11 placed in the furnace is important, and the shape and shape of the closed mold 11 are important.
The appropriate timing for unloading varies depending on various conditions such as heat capacity, shape, size, composition of the compacted compact A2, and set temperature of the furnace. The appropriate removal time will be determined through experimentation.

In the heating and melting treatment of the compacted compact A2 in the closed mold 11, it is necessary to proceed with melting in substantially the same state at the center and outside of the compact A2 without any time difference. ``If there is a time difference in heating due to the size of the compact A2 being large or the closed mold 11 being thick and large, etc., the closed mold 11 containing the compacted compact A2 may be replaced with the compact mold base material. Before heat treatment at a temperature higher than the melting point of the metal, preheat treatment is performed to a temperature lower than but close to the melting point of the base metal to bring each part of the mold 11 and the entire compacted powder molding A2 inside to that temperature state. After that, heat treatment may be performed to a temperature higher than the melting point of the base metal.

FIG. 3 shows an example of the configuration of a high temperature furnace 1 equipped with the above-mentioned preheating process.

Reference numeral 18 denotes an electric furnace in which a preheating furnace chamber 19 and a main heating furnace chamber 20 are connected.

Reference numeral 21 denotes a carriage to be heated, which is integrally attached and held at the tip of a heat-resistant rod 22 that can be freely pushed and pulled into the furnace.

Reference numeral 23 denotes a working cylinder part connected to the furnace opening. When the handle 221 of the rod 22 is grasped and the rod 22 is sufficiently pulled, the connecting part with the rod tip of the carriage 21 will be connected to the inner surface of the blind cover 24 of the working cylinder 23. Upon contact, further pulling of the rod is prevented, and the carriage 21 is moved into the working cylinder 23.

If the rod 22 is pushed in by about half its length from this state, the carriage 21 will be located in the preheating furnace chamber 19, and if it is further pushed in sufficiently, it will be located in the main heating furnace chamber 20. 25.2
6 is arranged on the left and right sides of the carriage 21.
It is also a movable refractory wall block that moves by pushing and pulling the rod 22. When the carriage 21 is located in the working tube 23, the block 25 at the tip closes the furnace opening 27 of the preheating furnace chamber 19 and works. Communication between the inside of the cylinder 23 and the preheating furnace chamber 19 is cut off.

When the carriage 21 is located in the preheating furnace chamber 19, the block 25 is located in the communication hole 28 of the partition between the preheating furnace chamber 19 and the main heating furnace chamber 20, and the other block 26 is located in the furnace opening 27 of the preheating furnace chamber 19. The preheating furnace chamber 19 is substantially independently nitrided. Further, when the carriage 21 is located in the main heating chamber 20, the bushing tank 26 is located in the communication hole 28 between the chambers 19 and 20, so that the main heating furnace chamber 20 is substantially independently nitrided. 29 is an opening with a lid formed on the upper surface of the working cylinder 23 for introducing the object to be heated; 30 is a cooling water tank provided on the lower side of the working cylinder 23 or connected via a shutter; 31 is a main heating A vibrator for introducing inert gas such as N2 or non-oxidizing gas is opened into the furnace chamber 20, and the gas flows through the main heating furnace chamber 20 -> preheating furnace chamber 19 - working cylinder 23 -> exit vibrator 32 and is then heated to the furnace. Room 20, 19
Maintain an inert or non-oxidizing atmosphere inside at all times.

33 is a movable refractory wall block guide stand or guide rail provided in the furnace chambers 18 and 19, and 34 is a heater.

Then, the carriage 21 is positioned in the working cylinder 23, and the closed mold 11 containing the powder compact as the heated member is placed and set on the carriage 21 through the opening 29 with a lid, and the lid of the opening 27 is closed. Push in 22 to move carriage 2.
1 is kept in the preheating furnace chamber 19 for a predetermined set time to perform the above-mentioned preheating.

Next, push the rod 22 further to move the carriage 2
1 is placed in the main heating chamber 20 and held for a predetermined set time to melt the metal powder in the mold 11. Immediately after the set time has elapsed, the rod 22 is pulled and the carriage 21 is moved to the working cylinder 2.
3 and then operate the rod 22 half a turn, the carriage 21 will turn upside down and the mold 11 will fall into the water tank 30, and the mold 11 and contents will fall into the water tank 30.
Rapid cooling is performed. The cooled mold 11 is then taken out from the water tank 30. At least during the main heating of the mold 11, the rod 22 is rotated so that the mold 11 does not fall from the carriage 21 even if the rod 22 is rotated, so that the heat treatment can be performed while the mold 11 is rotated. By doing so, heating is performed evenly, and it is effective in suppressing the rise of the solid lubricant powder due to the difference in specific gravity.

(4) Opening the mold After the treatment in (3) above, open the mold and product material A
Take out 1.

This product material A has better mechanical strength than conventional powder metallurgy materials, so the block body can be rolled into a plate shape using a hot processing method, or it can be stacked on a base metal plate and rolled as a whole. Molding processing such as manufacturing a so-called clad plate can be performed without any problem. 2 or more According to the method of the present invention, a. As explained in step (3) above, the solid lubricant powder is substantially maintained in a good uniform dispersion state in the molten metal matrix during the compacting process. Existing form, so to speak, a mechanical mixed structure alloy type composite material! It is possible to easily mass-produce with good yield even under the influence of gravity.

b Unlike the simple sintered bonding of metal powders as in conventional powder metallurgy materials, the base metal powder is melted and bonded throughout,
Also, expansion inside the closed mold during heating and melting. Due to the strong internal pressure of Of course, even when air is included (powder compacting processed product in a vacuum atmosphere), it is crushed by the above-mentioned strong internal pressure and virtually disappears, and the compact A becomes an extremely dense and solid flesh with no internal cracks. As shown in the Examples and Comparative Examples described below, it is possible to obtain a solid lubricant-containing metal composite material that has much better mechanical strength than conventional powder metallurgy materials.

c Even if the powder compaction properties of the raw material mixed powder are poor, the compacted compact A1 that has been compacted is placed in the closed mold 11 and the above-mentioned melting and sintering is performed, so deformation and tearing during melting and sintering are not taken into consideration. The compacting property is sufficient as long as it has enough shape-retaining power to prevent the compacted compact A1 from losing its shape or tearing due to excessive handling until it is placed in the mold 11, and the use of a binder is not required. Not necessary.

Therefore, the disadvantages mentioned in 4 above due to the use of binders in conventional powder metallurgy materials cannot occur. d When the oxide covering the surface of the base material metal powder of the raw material is applied to the melting and sintering method of the method of the present invention, it will exist uniformly dispersed in various parts of the dense, solid flesh of the product material, and this will be present in the product material. This helps increase the mechanical strength of the material.

Example 1 (Sn-C composite material) (1) Raw materials uniformly mixed powder.

゛''１゛゜゛-(2) Powder compacting Fill a press mold with the above mixed powder and press in a vacuum atmosphere for 6
The material was compacted into a disk with a diameter of 2 cm and a thickness of 0.8 G using a compression force of tons/d.

The density of the obtained compact was approximately 5.9y/CTl. (3) Melting and sintering/quenching A medium-sized plate 13, upper and lower cover plates 14 and 15, and a tightening bolt 16 as shown in FIG. It is housed in a high pressure and heat resistant sealed mold 11 made of steel, with an average pressure of 30
The bolts 16 were sufficiently tightened and the mold was assembled to about k9/d.

The inner peripheral surface of the mold hole of the medium-sized plate 13 and the inner surfaces of the lid plates 14 and 15 were interposed or lined with a tantalum thin plate as a release/closing lid packing 17. The closed mold 11 containing the above-mentioned molded body was placed in a high-temperature furnace at 400° C. and heated, and after approximately one powder had elapsed after being put into the furnace, it was taken out of the furnace and immediately put into water for quenching.

The above-mentioned time from putting it into the furnace to taking it out was set in advance through preliminary experiments.According to the preliminary experiments, in this example, after about one powder elapsed after the closed mold 11 was put into the furnace, the inside of the mold 11 After the melting of the Sn powder in the compacted compact is substantially completed, until about two and a half minutes have elapsed, the viscosity of the molten metal phase is still in a high viscosity state and the molten metal phase of the solid lubricant powder is mixed with the molten metal phase of the solid lubricant powder. The solid lubricant powder is substantially maintained in a uniformly dispersed distribution state, which causes floating mobile phase separation due to the difference in specific gravity of The floating mobile phase of the lubricant powder separates, and the uniform dispersion distribution state is disrupted.

Therefore, in the case of this example, the appropriate timing for taking out the closed mold 11 from the furnace may be set within the range from the time of introduction into the furnace until about one powder has elapsed and before about one powder has elapsed. In the case of this example, the lid plate 1 with the medium-sized plate 13 and the thin plate packing 17 intervened due to the increase in internal pressure due to thermal expansion of the molten metal inside the furnace after about one melting point after being put into the furnace.
4 and 15, and leakage begins to occur. Therefore, this protruding leakage may be visually observed from the furnace window and used as a guide to know when to take out the material. In some cases, the Sn powder may be taken out from the picker 8 before about 14 minutes have passed and is still in a semi-molten state to be rapidly cooled and obtain a product material. Then, the rapidly cooled sealed mold 11 is disassembled and the product material (ingot) A is taken out. The density of this product material has increased from approximately 5.9 y/d in the powder compact to approximately 6.2 y/CTI, and the solid lubricant powder is substantially evenly distributed in the Sn molten metal phase. It is contained as follows. The various properties of the product material A were also measured, and the results are shown in Table 1 in comparison with the measured values of the conventional powder metallurgy material B of Comparative Example 1 below. Comparative Example 1 (1) Raw material powder: Same as (1) of Example 1.

(2) Powder compaction: Air press, others are (2) of Example 1
Same point. (3) Sintering: 200°C in an inert gas (AO atmosphere), 12 times.

The density of the powder metallurgical material B thus obtained was approximately 5.7 y/d.

The coefficient of friction was determined using a Suzuki friction tester as a tester, with a mating material: mild steel (Hv2O6) and a test contact area of 2cd (
External size 20r! Rm, inner diameter 12? Ring-shaped rotating interview! friction), rotation speed 200r'Pm (friction speed 100TL,/M
In), the average friction coefficient is measured under the conditions of an additional load of 10k9, in the atmosphere/room temperature, and a friction time of 6 powders, at a friction time of 10 to 6 powders.

Further, the amount of wear is the amount of wear that occurred during the process of measuring the friction coefficient of the six powders mentioned above.

The graph in Figure 4 shows the density of each product material when compacted (presca is in each case 6 tons/c!i) and the density of the final material 4 (after melting and solidification).

The graph in FIG. 5 is a measurement graph of the relationship between the porosity of the powder compact and the porosity of the final material when the amount of graphite mixed is varied.

Figure 6 shows the friction coefficients of each product material manufactured with various amounts of graphite mixed in this example, and the friction coefficient of each powder metallurgy material manufactured with various amounts of graphite mixed in Comparative Example 1. It is a relationship graph.

Here, the conventional powder metallurgy material containing 15% or more of graphite is not shown in the figure because it disintegrates within 6 hours of friction time. 7th
Figures 11 to 11 show the hardness (Figure 7), specific wear rate (Figure 8), compressive strength (Figure 9), and shear strength (Figure 9) when the graphite content was varied. Figure 10) and tensile strength (Figure 11).

As is clear from the above, the material obtained by the method of the present invention maintains approximately the same level of friction coefficient when compared with conventional powder metallurgy materials (as can be seen from Figure 6, the material obtained by the method of the present invention is particularly Even if the amount of graphite, which is a solid lubricant, is kept to a relatively small amount (approximately 8% or less), it is possible to obtain a material with a coefficient of friction smaller than that of powder metallurgy materials.

), and it can be seen that the mechanical strengths are all at a much higher level than powder metallurgy materials. Example 2 (A1
-MOS2 composite material) (1) Raw metal powder N powder 95% Average particle size 40pm Melting point 660°C Solid lubricant powder MOS2 powder 5% Average particle size 7pm Melting point 1800°C Uniform mixed powder.

(2) Powder compaction: Same procedure as Example H8 (2) except for compression force of 6 tons/d1.

The density of the obtained green compact is approximately 2.72y/CTlO(3
) Melting sintering/quenching: Furnace temperature 700°C, heat treatment time 1
The other details were the same as in Example 1 (3).

The obtained product material is referred to as A. Comparative example 2 Conventional powder metallurgy material (referred to as B).

(1) Raw material powder: Same as (1) of Example 2.

(2) Powder compaction: air press, others are (2) of Example 2
Same as. (3) Sintering: in an inert gas (AI') atmosphere,
400'C, 12 pieces.

Table 2 shows the measured values of various properties of the product material A obtained in Example 2 and the powder metallurgy material B obtained in Comparative Example 2.

Example 3 (CU-C composite material) (1) Raw materials Metal powder C medium powder 95% Average particle size 70pm Melting point 1098C Solid lubricant powder graphite powder 5% Average particle size 75μm Melting point 3500'C uniformly mixed powder.

(2) Powder compaction: compression force 6 tons/d, other settings were as in Example 1 (
Same as 2).

Density of the obtained green compact is approximately 7.08y/DO (3) Melting sintering/quenching: Furnace temperature 1150°C, heat treatment time 1g,
The rest is the same as in Example 1 (3).

The obtained 7 product materials are referred to as A. Comparative example 2 Conventional powder metallurgy material (referred to as B).

(1) Raw material powder: Same as (1) of Example 3.

(2) Powder compacting: Air press, other details are the same as in Example 3 (2). (3) Sintering: In an inert gas (Ar) atmosphere, 80
0℃, 12 powder.

The measured values of various properties of the product material A obtained in Example 3 and the powder metallurgy material B obtained in Comparative Example 3 are shown in Table 3 for subject 5.

Example 4 (Ag-MOS2/WS2 composite) (1) Raw metal powder ~ Powder 95% Average particle size 70pm Melting point 9600C 1:1 mixture of solid lubricant powder MOS2 and WS2
Uniform mixed powder with 5% powder, average particle size 75μm, and melting point MOS218OO'C.

(2) Powder compaction: Compressive force 6 tons/d1 and others were as in Example 1 (
Same as 2).

Density of the obtained green compact is about 8.4 y/d* (3) Melting sintering/quenching: Furnace temperature 1000°C, heat treatment time 1 powder, otherwise the same procedure as in Example 1 (3).

The obtained product material is referred to as A. Comparative example 2 Conventional powder metallurgy material (referred to as B).

(1) Raw material powder: Same as (1) of Example 4.

(2) Powder compaction: Air press, other details are the same as in Example 4 (2). (3) Sintering: In an inert gas (Ar) atmosphere, 7
00℃, 12 pieces.

Table 4 shows the measured values of various properties of the product material A obtained in Example 4 and the powder metallurgy material B obtained in Comparative Example 4.

In addition, for Examples 2 to 4, 4th to 11th for Example 1
Although I have omitted the presentation of graphs of changes in various properties due to differences in the amount of solid lubricant blended as shown in the figure, in both cases the mechanical strength levels are higher than powder metallurgy materials made of the same base metal powder. As in the case of Example 1, it is significantly higher.

Note that the closed mold 11 may not be used repeatedly, and the molten sintered solidified material (product material) inside may be taken out by destroying the mold 11. In this case, the molding layer 17 is unnecessary. . A vibrator material may be used as the closed mold 11, and a compacted powder body may be stuffed into the vibrator material to close both ends of the vibrator and heat treatment may be performed. In this case, the product material is removed by destroying the vibrator. Also, powder compact A2
Depending on the type of raw metal powder or solid lubricant, the volume may shrink when heated.

In such a case, the powder compact is first preheated to cause volumetric contraction, and then stored in a closed mold that accommodates it with virtually no gaps, and then heated for melting and sintering. do it.

[Brief explanation of drawings]

Fig. 1 is a cross-sectional side view showing the structure of an example of a vacuum atmosphere powder compacting device, Fig. 2 is a sectional view of the closed mold in which compacting is housed in a high pressure and heat resistant closed mold, and Fig. 3 The figure is a vertical side view showing an example structure of a heating furnace device, and Figure 4 shows the density of each material in a compacted compact when the blending amount of graphite, which is a solid lubricant, is varied in Example 1. Figure 5 is a measurement graph of the relationship between the porosity of the powder compact and the final material, and Figures 6 to 11 are comparisons with Example 1. Measurement graphs of changes in friction coefficient, hardness, specific wear rate, compressive strength, shear strength, and tensile strength of the material of Example 1 when the blending amount of graphite as a solid lubricant was varied. It is. 11 is a high pressure resistant/heat resistant sealed type, and A1 is a powder compact housed therein.

Claims (1)

[Scope of Claims] 1. A substantially uniformly mixed powder containing a base metal powder and a solid lubricant powder as main components is compacted, and the compacted body is formed into a high-pressure-resistant mold having a cavity approximately the same shape as the compacted body. The mold is fitted into a heat-resistant closed mold cavity with virtually no gaps and sealed, and the sealed mold is heated to a temperature higher than the melting point of the base metal of the powder compact to release the base metal powder of the compact inside. The solid lubricant powder, which is present in a substantially uniformly dispersed state, is rapidly cooled before it substantially undergoes levitation due to the viscosity reduction as the base metal powder melts. A method for producing a metal composite material containing a solid lubricant, comprising: rapidly solidifying the contents in the mold, and then taking out the solidified material from the mold. 2. The solid lubricant-containing metal according to claim 1, characterized in that a substantially uniformly mixed powder containing a base metal powder and a solid lubricant powder is compacted in a vacuum atmosphere. Method of manufacturing composite materials. 3. Before heating the closed mold containing the compacted compact to a temperature higher than the melting point of the base metal of the compact, preheat to a temperature lower than but close to the melting point of the base metal to form the compact. The method for producing a solid lubricant-containing metal composite material according to claim 1, characterized in that the whole of the solid lubricant-containing metal composite material is brought to that temperature state and then heated to a temperature higher than the melting point of the base metal. . 4. The solid lubricant-containing metal according to claim 1, wherein the preheating of the powder compact and the heat treatment above the melting point of the base metal are performed in an inert or non-oxidizing atmosphere. Method of manufacturing composite materials. 5. The solid lubricant-containing metal composite material according to claim 1, 3, or 4, characterized in that the heat treatment of the compacted compact is performed while the closed mold containing the compact is rotated. Production method.