JPH08120422A - Sintered alloy for skid and its production - Google Patents

Abstract

PURPOSE: To produce a sintered alloy for skid, capable of being easily produced and showing the most effective sliding action, by specifying a composition consisting of Fe, Cu, Zn, Pb, and Sn and providing a sintered alloy composition containing specific amounts of specific superfine quartz grains. CONSTITUTION: A raw material powder, prepared by mixing, by weight, 20-80% Fe, 15-77% Cu, 1-26% Zn, 0.5-7% Pb, 0.5-7% Sn, and 0.05-0.5% of spherical superfine quartz grains having nonuniform grain size mainly of about 0.2-0.4μm, is compacted and sintered at 830-1000 deg.C. The superfine quartz grains can be obtained by irradiating high purity quartz glass with high temp. laser beam of about 35000-40000 deg.C and then recovering the resultant evaporated gas and cooling it.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the use of ultrafine quartz particles, and more particularly to a sintered alloy for lubricants using ultrafine quartz particles which can be widely applied as various lubricants and a method for producing the same. .

[0002]

2. Description of the Related Art Conventionally, various types of sintered alloys have been known for use as bearing materials and the like. The major ones are copper-based and iron-based. For example, Cu-based copper
There are Sn, Cu-Sn-C, and Cu-Sn-Pb-C alloys, and Fe-C, Fe-Pb-C, and Fe as the iron type.
-Cu-C alloys have been proposed and put to practical use.

However, among the above-mentioned conventional ones, the iron-based ones are lower in cost and higher in mechanical strength than the copper-based ones, but have a high hardness, so that they are unsuitable for bearing materials and the like. However, it has a drawback that it is inferior in corrosion resistance. On the other hand, in the copper type, their properties have a contrasting relationship.

From this point of view, iron-copper alloys have been proposed for the purpose of intermediate properties between the iron-based and copper-based alloys. In this case, it is obtained as an intermediate property between the characteristics of iron-based ones and the characteristics of copper-based ones, and each of the disadvantages of iron-based and copper-based ones is covered, but it is not satisfactory in familiarity. Absent.

Therefore, in order to solve the above-mentioned problems, for example, in order to provide the sintered alloy body with preferable mechanical strength and to obtain low cost, 20 to 80 wt% of Fe is contained,
Corrosion resistance and stabilization of sintered alloy body and Zn, S
In order to obtain a preferable added distribution state of n and Pb, C
Sintered alloy body containing 15 to 77 wt% of u and 1 to 26 wt% of Zn in order to obtain preferable corrosion resistance in a sintered alloy body which secures the skeletal action of the Fe powder, and has a sintering bond adopting the skeletal function of the Fe powder. 0.5 to 7 wt% of Pb, which is the main function of the metal to obtain the desired familiarity
A sintered alloy having a sintered composition containing 0.5 to 7 wt% of Sn as a main component for preventing the strength deterioration due to the addition of Pb has been proposed (Japanese Patent Laid-Open No. 3-199348). Issue).

[0006]

However, since the sintered alloy used as a lubricant for the above-mentioned conventional bearings is used after being impregnated with oil, it maintains a predetermined porosity so that the oil content can be appropriately obtained. It is necessary to sinter as described above. Therefore, the setting of the porosity is extremely troublesome during the production of the sintered alloy, and if the appropriate porosity cannot be obtained, the strength of the sintered alloy body cannot be obtained.

[0007] Therefore, as a result of intensive studies, the present inventor has made quartz, which is high in hardness and excellent in thermal stability, into fine particles and contains fine particles of quartz as a lubricant in the composition of a sintered alloy. Thus, by obtaining a sintered alloy body without considering the porosity, while having high strength,
It was found that a sintered alloy for a lubricant, which is effective as a lubricant and can be easily manufactured, can be obtained.

That is, quartz is generally known as quartz or quartz, and its composition is silicon dioxide Si.
It consists of O ₂ . In addition, quartz has the following physical properties:
It has a hardness of 7 and a specific gravity of 2.650, and it has piezoelectric properties. It also has a chemical property that it does not dissolve in acids other than hydrofluoric acid, and it is used as a material for ornaments, heat-resistant products, electronic devices and optical parts have.

Conventionally, as a method for producing metal-based and ceramic-based ultrafine particles, a physical pulverization method,
A liquid phase method and a gas phase method are known, and it is known that a gas phase method using a plasma reactor or a laser beam can be applied especially to the production of silica-based ultrafine particles. For example, commercially available SiC powder (α-SiC) is used as CO gas in an Ar gas atmosphere.
It has been announced that ultra-fine particles of SiC can be obtained by being able to perform evaporation by irradiation with _two laser beams. In this case, the particle size increases as the atmospheric gas rises, but the particle size of the SiC ultrafine particles in Ar gas 10 Torr is about 0.02 μm, and the ratio of Si in the SiC ultrafine particles is It has been confirmed that the higher the pressure, the higher the pressure.

Today, a wide variety of lubricants are used to reduce frictional resistance and wear between relatively moving objects or parts and to save energy consumption. Such lubricants include liquid lubricants, semi-solid or viscous paste-like greases at room temperature, and powdered solid lubricants, all of which are suitable for any use condition. There is no lubricant, and it has been put to practical use after being improved to improve the properties of the lubricant according to its use and purpose. From this point of view, the lubricating oil and grease used in various mechanical elements such as shafts and bearings, gears, etc. on which a very large load acts, plastic working, etc., are more extreme than the conventional ones in terms of extreme pressure and lubrication. Solid lubricants (graphite, molybdenum disulfide, boron nitride, tungsten disulfide, graphite fluoride, polytetrafluoroethylene powder, additives, etc.) as additives for the purpose of improving properties such as performance.
(Mica, talc, etc.) is also blended (Japanese Patent Laid-Open No. 1-92296).

However, solid lubricants as such additives generally have a poor affinity for lubricating oils and greases, and have a large difference in specific gravity. Therefore, dispersion stability in lubricating oils and greases is stable. It has poor performance, so when solid lubricants are added as additives in lubricating oil or grease,
When a large amount of inorganic or organic dispersant is required and addition of the dispersant is not preferable, solid lubricant cannot be used in lubricating oil or grease, or it may be added. In some cases, separation occurred and uniform mixing became difficult, and sufficient extreme pressure and lubrication performance could not be exhibited. For this reason, for example, it has been proposed to modify the surface of the powdery solid lubricant (Japanese Patent Laid-Open No. 56-112995), but there is a problem that the manufacturing process becomes complicated.

It has been proposed to use a specific naphthenic oil as a part or all of the base oil so that such a powder solid lubricant can be stably dispersed in the base oil for a long period of time. (JP-A-1-92296).
However, in this case, since the base oil to be used is limited, the range of its application is also limited.

Therefore, the object of the present invention is to obtain ultrafine silica particles which are spherical and have a higher strength than high-purity quartz glass, have heat resistance and chemical resistance, and are highly dispersible, harmless and sterile. Sintered alloy for lubricants, which can be manufactured easily and exhibit the most effective sliding action by producing the above-mentioned quartz ultrafine particles as a composition of an iron-based or copper-based sintered alloy. And to provide a manufacturing method thereof.

[0014]

The sintered alloy for lubricant according to the present invention contains 20 to 80 wt% of Fe and 15 to 77 w of Cu.
t%, Zn 1 to 26 wt%, Pb 0.5 to 7 wt%
%, Sn of 0.5 to 7 wt%, the balance being inevitable impurities, and spherical ultrafine particles having a non-uniform particle diameter centered on about 0.2 to 0.4 μm. .0
It is characterized by having a sintering composition containing 5 to 0.5 wt%.

The method for producing a sintered alloy for a lubricant according to the present invention is: Fe; 20 to 80 wt%, Cu; 15 to 77 w
t%, Zn; 1-26 wt%, Pb; 0.5-7 wt
%, Sn; 0.5 to 7 wt%, about 0.2 to 0.4 in spherical shape
Quartz ultrafine particles having a non-uniform particle diameter centered on μm;
The raw material powder mixed at a ratio of 0.05 to 0.5 wt% is compacted and then sintered at 830 to 1,000 ° C.

The spherical ultrafine silica particles having a non-uniform particle diameter centered at about 0.2 to 0.4 μm are about 35,000 to 40,000 with respect to high purity silica glass.
It can be obtained by irradiating a high temperature laser beam of ℃, collecting the evaporated gas generated by this, and cooling.

[0017]

According to the sintered alloy for a lubricant of the present invention, a non-uniformity of about 0.2 to 0.4 μm in a spherical shape is present together with a predetermined amount of powder of Fe, Cu, Zn, Pb and Sn. By mixing a predetermined amount of ultrafine quartz particles with various particle sizes to obtain a sintered alloy body, the sliding action of the ultrafine quartz particles effectively functions, lowers the friction coefficient and stabilizes it, and wear resistance And the seizure resistance can be improved.

Moreover, the sintered alloy for lubricant according to the present invention is
At the time of its production, as in the case of a normal sintered alloy, the respective powders are mixed in predetermined amounts respectively, and in this case, the addition of a publicly known binder or lubricant is allowed, but the porosity is not taken into consideration. Since the bonding can be performed, the process can be simplified and a sintered alloy body of stable quality can always be manufactured at low cost.

Therefore, the sintered alloy for lubricant according to the present invention is
It can be widely used not only as various bearing materials but also as various sliding members or lubricating members which are required to have wear resistance and seizure resistance.

However, in the present invention, Fe is the main component of the sintered alloy of the present invention, and Fe is 20 to 80 in order to obtain appropriate strength and to maintain low cost.
wt% is added.

Further, in order to impart corrosion resistance to the sintered alloy of the present invention and stabilize the sintered alloy body and obtain a preferable addition distribution state of Zn, Sn, Pb, etc., Cu is added in an amount of 15 to 7
Add 7 wt%.

Furthermore, in order to obtain preferable corrosion resistance in the sintered alloy body in which the main action of Fe is secured, Zn is added to 1
~ 26 wt% is added. Further, in the sintered alloy body having the main function of Fe, 0.5 to 7 wt% of Pb, which is the main action for obtaining the desired conformability, is contained.
Then, 0.5 to 7 wt% of Sn is added as a main component for avoiding the strength deterioration due to the addition of Pb.

Further, as the quartz ultrafine particles, for example, about 35,000 to 40, with respect to high-purity quartz glass,
As a mixed particle having a spherical shape obtained by irradiating a high temperature laser beam of 000 ° C., recovering the vaporized gas generated thereby, and cooling, and having a non-uniform particle size centered at about 0.2 to 0.4 μm It can be manufactured and is added in an amount of 0.05 to 0.5 wt%, preferably 0.1 wt%, in order to ensure its slipperiness properly.

In the production of the sintered alloy according to the present invention, camphor, paraffin, resin, ammonium chloride, mineral oil or the like may be used as a binder in order to smoothly achieve the mixing of various powders having a sintered composition. it can. Further, as the lubricant, zinc stearate, lithium stearate, paraffin, resin or the like can be used.

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

[0026]

EXAMPLES According to the present invention described above, Fe, Cu, Zn,
Sintered alloys for lubricants were prepared using powder compositions of sintered alloys with various contents of Pb, Sn and quartz ultrafine particles.

Example 1 Fe; 80 parts, Cu; 15 parts, Zn; 2.5 parts, Pb;
A sintering composition powder consisting of 1 part, Sn; 1 part, and quartz ultrafine particles; 0.5 part was mixed and sintered at 900 ° C. to have a diameter of 10 m.
A shaft member having a length of m and a length of 20 mm was manufactured.

Example 2 Fe; 20 parts, Cu; 77 parts, Zn; 0.5 part, Pb;
A sintering composition powder consisting of 1.1 parts, Sn; 1.1 parts, and ultrafine silica particles; 0.3 part was mixed and sintered at 980 ° C. to manufacture the same shaft member as in Example 1.

Example 3 Fe; 32 parts, Cu; 39 parts, Zn; 25.5 parts, P
b; 2.6 parts, Sn; 0.7 part, quartz ultrafine particles; 0.2
A sintering composition powder consisting of parts was mixed and sintered at 850 ° C. to manufacture a shaft member similar to that of Example 1.

Example 4 Fe; 30 parts, Cu; 51 parts, Zn; 4.85 parts, P
b; 7 parts, Sn; 7 parts, and ultrafine silica particles; 0.15 parts of a sintering composition powder were mixed and sintered at 850 ° C. to manufacture the same shaft member as in Example 1.

Example 5 Fe; 50 parts, Cu; 30 parts, Zn; 14.5 parts, P
b; 3.2 parts, Sn; 2.2 parts, ultrafine quartz particles; 0.1
A sintering composition powder consisting of parts was mixed and sintered at 830 ° C. to manufacture a shaft member similar to that of Example 1.

Example 6 Fe; 52 parts, Cu; 30 parts, Zn; 14.5 parts, P
b; 2.2 parts, Sn; 1.2 parts, quartz ultrafine particles; 0.1
A sintering composition powder consisting of parts was mixed and sintered at 830 ° C. to manufacture a shaft member similar to that of Example 1.

Example 7 Fe; 60 parts, Cu; 26 parts, Zn; 10 parts, Pb;
1.72 parts, Sn; 2.2 parts, quartz ultrafine particles; 0.08
A sintering composition powder consisting of parts was mixed and sintered at 830 ° C. to manufacture a shaft member similar to that of Example 1.

Example 8 Fe; 44 parts, Cu; 40 parts, Zn; 7.5 parts, Pb;
5.23 parts, Sn; 3.2 parts, quartz ultrafine particles; 0.07
A sintering composition powder consisting of parts was mixed and sintered at 830 ° C. to manufacture a shaft member similar to that of Example 1.

Example 9 Fe; 26 parts, Cu; 45 parts, Zn; 19 parts, Pb;
4.55 parts, Sn; 5.4 parts, quartz ultrafine particles; 0.05
A sintering composition powder consisting of parts was mixed and sintered at 860 ° C. to manufacture a shaft member similar to that of Example 1.

In each of the above examples, the sintered composition powder contained iron powder having 80 mesh or less as Fe, brass powder having 80 mesh or less as Cu and Zn, or Cu.
Further, bronze powder of 80 mesh or less was used as Sn, and lead powder of 60 mesh or less was used as Pb.

Then, the sintered products obtained in Examples 1 to 9 were subjected to measurement of friction coefficient, wear resistance test and seizure resistance test, respectively, and the results shown in Table 1 were obtained. It was

[0038]

[Table 1]

As is clear from the above measurement results, it was confirmed that the sintered alloy for a lubricant of the present invention can significantly reduce the frictional resistance as compared with the conventional sintered alloy. Similarly, it was confirmed that the wear resistance and seizure resistance were also excellent.

Therefore, the sintered alloy for a lubricant according to the present invention having the above-mentioned structure has a high hardness with respect to the sliding surface of the ultrafine quartz particles contained in the sintered alloy and has a spherical shape. An excellent wear-resistant product can be obtained, which has excellent sliding action, heat resistance, chemical resistance, and harmlessness.

The sintered alloy for lubricants of the present invention can be used as a lubricating member, and its application can be greatly expanded by using a known lubricating oil together.

[0042]

As is apparent from the above-described embodiments, the sintered alloy for a lubricant according to the present invention contains 20 to 80 wt% Fe.
%, Cu 15 to 77 wt%, Zn 1 to 26 wt%,
Pb of 0.5 to 7 wt% and Sn of 0.5 to 7 wt%, the balance being unavoidable impurities, and a spherical non-uniform particle size centered on about 0.2 to 0.4 μm By adopting a sintering composition containing 0.05 to 0.5 wt% of quartz ultrafine particles having the above, the sliding action of the quartz ultrafine particles effectively functions, lowering the friction coefficient and stabilizing it.
Wear resistance and seizure resistance can be improved.

Therefore, the sintered alloy for lubricants obtained by the present invention is widely used not only as various bearing materials but also as various sliding members or lubricating members required to have wear resistance and seizure resistance. can do.

The preferred embodiments of the present invention have been described above. However, the present invention is not limited to the above embodiments, and various design changes can be made without departing from the spirit of the present invention. Is.

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Claims (4)

[Claims] 1. Fe of 20 to 80 wt% and Cu of 15 to
77 wt%, Zn 1 to 26 wt%, Pb 0.5 to 7
wt% and Sn of 0.5 to 7 wt%, and the balance consisting of unavoidable impurities.
A sintered alloy for a lubricant, which has a sintering composition containing 0.05 to 0.5 wt% of quartz ultrafine particles having a non-uniform particle diameter centered on m. 2. Ultra-fine silica particles having a spherical shape and a non-uniform particle diameter centered at about 0.2 to 0.4 μm are used at a high temperature of about 35,000 to 40,000 ° C. for high purity silica glass. The sintered alloy for a lubricant according to claim 1, which is obtained by irradiating a laser beam, recovering the vaporized gas generated thereby, and cooling it. 3. Fe: 20-80 wt%, Cu: 15-
77 wt%, Zn; 1-26 wt%, Pb; 0.5-7
wt%, Sn; 0.5 to 7 wt%, spherical shape of about 0.2 to
Ultrafine quartz particles having a non-uniform particle size centered on 0.4 μm; raw material powder mixed at a ratio of 0.05 to 0.5 wt% is compacted and then sintered at 830 to 1,000 ° C. A method for producing a sintered alloy for a lubricant, comprising: 4. Ultra-fine silica particles having a spherical shape and a non-uniform particle diameter centered at about 0.2 to 0.4 μm are used at high temperatures of about 35,000 to 40,000 ° C. for high-purity silica glass. The method for producing a sintered alloy for a lubricant according to claim 3, which comprises irradiating a laser beam, collecting the vaporized gas generated by the laser beam, and cooling the vaporized gas to obtain the sintered alloy.