Material of sleeve bearing

FIELD: chemistry.

SUBSTANCE: invention relates to application of CuFe2P in sleeve bearing or as material of sleeve bearing, with CuFe2P representing copper alloy, which contains 2.1-2.6 wt % Fe, 0.05-0.2 wt % Zn 0.015-0.15 wt % P, to 0.03 wt % Pb and to 0.2% of other additives. Invention additionally relates to composite material (1) of sleeve bearing, which contains support layer (2) and bearing metal layer (3) based on CuFe2P with Fe2P particles formed on it (4).

EFFECT: creation of sleeve bearing material, which has advantages of copper-based materials, in which it is possible to refuse from application of lead and which has good workability and excludes bearing cramping, in addition, material of sleeve bearing was easily produced and applied on usual support layers, with application of CuFe2P resulting in sleeve bearings with high heat conductivity and good mechanic properties.

11 cl, 2 dwg, 2 tbl, 2 ex

 

The technical field

The present invention relates to lead-free material sliding bearing with a matrix based on CuFe2P. The invention additionally relates to a composite material of a sliding bearing with a steel support layer and bearing layer of such material sliding bearing CuFe2P, and anti-friction element on the basis of CuFe2P.

The level of technology

Lead-free sintered materials bearings of copper-based, especially on the basis of the bronze matrix, well known for its good thermal conductivity and its high wear and corrosion resistance as compared with the same lead-containing materials. In developing these materials was the desire to replace lead-containing materials bearings, because lead is classified as a pollutant harmful to the environment. Lead material bearings has the function of a solid lubricant. It is therefore necessary to find a replacement for this solid lubricant. Otherwise single-phase bronze material can have, for example, increased sensitivity to the clutch in the friction conditions with mixing. With this purpose in the literature and in practice has been found and proposed to use a number of different compositions.

For example, EP 0962541 A1 describes antifriction material based on copper, to the torus in the matrix of the sintered copper or sintered copper alloy dispersed particles of AlN, Al2O3NiB, Fe2B, SiC, TiC, WC, Si3N4, Fe3P, Fe2P and/or Fe3B. To obtain this antifriction material powder of copper or copper alloy is mixed with, for example, AlN particles (Hv: 1300, a particle diameter of, for example, 0.5 μm) and Fe3P (Hv: 800, particle diameter, for example, 5 μm) and the mixture is sintered. In the mixture and in anti-friction material mass fraction and average particle diameter with an average hardness (Hv) 500-1000 (i.e. Fe3P, Fe2P and/or Fe3B) are chosen so that they were more than mass fraction and the average diameter of the particles with high hardness (Hv) of 1100 or more (i.e. AlN, Al2O3NiB, Fe2B, SiC, TiC, WC and/or Si3N4).

Other anti-friction material based on copper are described in WO 2008/140100. It contains 1.0 to 15 wt.% Sn, 0.5 to 15 wt.% Bi and 0.05-5 wt.% Ag, and Ag and Bi are present in the eutectic state. If necessary, anti-friction material may contain 1-10 wt.% particles of Fe3P, Fe2P, FeB, NiB and/or AlN with an average diameter of grains of 1.5 to 70 microns.

In contrast, CuFe2P mainly used so far in the electronics industry (for example, as a contact material) and as a heat exchange material. US 2009/0010797, for example, describes a plate for electronic components of the alloy Cu-Fe-P, containing 0.01 to 3 wt.% Fe, 0.01 to 0.3 wt.% R and has a special orientation. CuFe2P as a suitable copper alloy. US 2006/0091792 describes sprayed targets for flat screens from special alloys Cu-Fe-R.

The basis of the present invention have the task to provide the material of the sliding bearing, which has the advantages of materials based on copper and in which you can refuse the use of lead. The material of the bearing must have good machinability and prevent jamming of the bearing. In addition, it is desirable that the material of the sliding bearing is easily produced and deposited on a regular anchor layers.

The invention

It has been unexpectedly discovered that the use of CuFe2P leads to the bearings with high conductivity and good mechanical properties.

Therefore, the present invention relates to the use of CuFe2P for the bearings or as material bearings. The invention additionally relates to a composite material of the sliding bearing and the sliding bearing, containing the above-mentioned material of the sliding bearing.

Brief description of drawings

Figure 1 shows polarographic with the material of the sliding bearing according to the invention.

Figure 2 shows an enlarged section of polupudrenka with Figure 1.

Detailed description of the invention

CuFe2P (CW107C; S) represents a copper alloy, which is according to the specification DIN EN contains 2.1-2.6 wt.% Fe, 0.05 to 0.2 wt.% Zn, of 0.015 to 0.15 wt.% P, up to 0.03 wt.% Pb and up to 0.2 wt.% other additives. Suitable for the purposes of the present invention the alloy is available under the designation Wieland-K65®and has the following composition (approximate values):

Wt.%
Fe2,4
Zn0,12
P0,03
CuRest

Specific heat CuFe2P is (see information on CuFe2P German copper Institute):

Temperature [°C]Specific heat capacity [j/(g·K)]
200,38
1000,38
2000,39
3000,41

According to the invention CuFe2P used as a material of a sliding bearing.

In the preparation of the material of the sliding bearing according to the invention CuFe2P preferably is sintered or cast. Spokanepremature performed at a temperature of 950-980°C.

During preparation of the material of the sliding bearing according to the invention of CuFe2P by sintering and/or casting solids Fe2P, which are present in the matrix. In contrast to the information ER 0962541 A1, they do not need to implement with the help of special stages. These solid particles lead to high resistance to abrasion. They are also useful as chip breakers, which helps to improve the machinability of the material, for example, when drilling the bearing. Present particles of Fe2P lead to a good polishing properties of moving in the opposite direction of the element and thus prevent jamming of the sliding bearing and the possible transfer material bearing on moving in the opposite direction of the element and the associated adhesion of the bearing to that element.

Another advantage of the material of the sliding bearing according to the invention is its high thermal conductivity, which is, for example, two times higher than that of cast CuNi2Si, which is often used in bearings. Compared with the conventional sintered materials, such as, for example, CuSn8Ni, CuSn10Bi3,5 and CuPb23Sn3, thermal conductivity is even higher, up to 5 times. This leads to good drainage formed in the bearing friction heat and, therefore, less likelihood of overheating followed by the facilities of material bearing upon the conditions of friction with mixing. Good drainage formed in the bearing heat also eliminates thermal influence is present in the bearing oil, which can lead to changes in viscosity and behavior grease.

Thanks to the combination of high thermal conductivity and polishing action due to particulate Fe2P can be particularly effectively prevented the seizure of the bearing, as both effects reduce the adhesion of the material of the sliding bearing to moving in the opposite direction to the element. This effect may be preferred implementation of the invention is even more enhanced by introducing additional solid particles.

Suitable solid particles include, for example, particles of AlN, Al2O3NiB, Fe2B, SiC, TiC, WC, W2C, Mo2C, c-BN, MoSi2Si3N4, Fe3P, Fe2P, Fe3B, TiO2and ZrO2.

In another preferred implementation, the material of the sliding bearing according to the invention additionally contains an even and solid lubricant, such as, for example, h-BN or graphite. By adding the solid lubricant reduces the coefficient of friction and therefore heat in the bearing. If the solid lubricant use h-BN can be used, for example, particles described in DE 102007033902 B3, the content of which is incorporated here by reference.

From Britanie additionally relates to a composite material of a sliding bearing. Fig. 1 and 2 show polarographic (1) composite sliding bearing according to the invention, which includes a support layer (2), preferably of steel, and the above-described material of the sliding bearing (3) on the basis of CuFe2P with formed therein particles of Fe2P (4) in the form of a bearing metal layer. The thickness of the bearing metal layer is preferably 0.1 to 1.0 mm, particularly preferably 0.3 to 0.5 mm.

Preferably, the bearing metal layer of the above material, the sliding bearing is an antifriction layer with a thickness of 7-20 μm. Particularly preferably, the anti-friction layer is break-layer with a thickness of 1-10 μm. Such anti-friction layers and break-layers are well known to the expert and are typically used in bearings.

In another aspect, the present invention relates to a sliding bearing, containing this composite material bearings.

EXAMPLES

Example 1

For preparation of the material of the sliding bearing powder CuFe2P was applied on a steel support layer and the first step was to specaly at 950-980°C. Then the material was compactional (condensed) by stage of rolling, so got a porosity value below 0.5%. Then for healing sintered layer specification is the W was repeated at 950-980°C and through the second stage of rolling hardness of the layer is brought up to 90-150 HBW 1/5/30, and porosity up to values of less than 0.3%.

Example 2

For preparation of the material of the sliding bearing was heated CuFe2P above its melting point in 1089°C and melted. Then the melt with a temperature of 1150-1250°C was poured on a steel support layer.

After that, the surface layer can be smoothed well-known specialist way by means of mechanical processing and, if necessary, brought to the desired hardness by means of one or more stage(s) rolling.

1. The use of CuFe2P slide bearing, and CuFe2P is a copper alloy containing 2.1 to 2.6 wt.% Fe, 0.05 to 0.2 wt.% Zn, of 0.015 to 0.15 wt.% P, up to 0.03 wt.% Pb and up to 0.2 wt.% other additives.

2. The use of CuFe2P as the material of the sliding bearing, and CuFe2P is a copper alloy containing 2.1 to 2.6 wt.% Fe, 0.05 to 0.2 wt.% Zn, of 0.015 to 0.15 wt.% P, up to 0.03 wt.% Pb and up to 0.2 wt.% other additives.

3. The use according to any one of paragraphs. 1 and 2, and CuFe2P used in the form of a cast material.

4. The use according to any one of paragraphs. 1 and 2, and CuFe2P used in the form of sintered material.

5. Application under item 4, and CuFe2P is sintered at a temperature of 950-980°C.

6. The use according to any one of paragraphs. 1 and 2, and the material on the basis of CuFe2P introduced solids.

7. Application under item 6, and entered particles of AlN, Al2O3NiB, Fe2B, SiC, TiC, WC, W2C, Mo2C, c-BN, MoSi2Si3N4, Fe3P, Fe2P, Fe3B, TiO2and ZrO2.

8. The use according to any one of paragraphs. 1 and 2, and the material introduced solid lubricant.

9. Application under item 8, and as a solid lubricant use h-BN or graphite.

10. Composite material (1) sliding bearing containing support layer (2), preferably of steel, and the bearing metal layer (3) of the material of the sliding bearing according to any one of paragraphs. 2-9.

11. The anti-friction element or the bearing containing composite sliding bearing on p. 10.



 

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