Sliding element and method for its production

FIELD: machine building.

SUBSTANCE: sliding element with a pre-shaped substrate and galvanically applied anti-friction layer, formed of an alloy of tin, antimony and copper, whose content is in wt %: 5-20% antimony, copper 0.5-20% and the rest is tin, and lead content <0.7%, and the full content of other components is <0.5%, and in the layer of sliding bearing the tin crystals are of predominantly globular shape. Method of receiving a sliding element is that the electrolytic deposition of antifriction layer of an alloy with the components of tin, antimony and copper is carried out, and an electrolyte as a wetting agent preferably contains C13C15-oxo-alcohol, C16C18-fatty alcohol C18-oxo-alcohol with degree of ethoxylation from 10 to 30. The composition and deposition rate are adjusted by addition of auxiliary substances with large molecules, resulting in increased anti-friction layer and emerging of crystals of tin of a globular shape.

EFFECT: creation of the layer for a sliding bearing with improved operating characteristics.

10 cl, 1 ex

 

The invention relates to a sliding element c defines the shape of the substrate and the antifriction layer, a deposited galvanically, which is formed from an alloy with components of a tin, antimony and copper, the proportion of which is in wt.%:

antimony 5-20%,

copper 0.5 to 20%,

the rest of the tin,

moreover, the lead content of <0.7 percent, and the total content of other components is <0.5 percent.

The invention relates also to a method for anti-friction layer of the alloy components with tin, antimony and copper by electrolytic deposition on defines the shape of the substrate.

Layer for sliding bearing mentioned in the beginning of the kind known, for example, from the patent DE 8206353 U1. When this layer for a sliding bearing is applied by galvanic method on the substrate, which is on a steel support sleeve. When this layer for a sliding bearing has a thickness of about 20 μm. In addition, strive to ensure that the content of copper in the layer for a sliding bearing was less than 0.5 wt.%, as more copper content according to this contrasted with the link has a negative effect on the fatigue properties of the layer for a sliding bearing.

In practice, the known layers for a sliding bearing get galvanically with the use of wetting, which is sold under the name Igepal CO 880, production Rhodia Nove-care, and one is camping nonylphenolethoxylates with 30 ethoxy groups (EO). Forming an electrolytic layer occurs with the formation of columnar crystals and allows you to get the suitable layers, which would be significantly thicker than 20 μm. Thus, it is natural that the service life of the layers for a sliding bearing is very limited because of the inevitable abrasion.

The basis of the present invention are tasked with the preparation layer for bearing with improved operating characteristics.

According to the invention this problem is solved for a sliding bearing of the above-mentioned type so that the layer sliding bearing crystals of tin are formed mainly in the form of globules.

In addition, to solve this problem the method according to the invention is distinguished by the use of electrolyte-based foreborne acid and perborate metals in aqueous solution, which contains the following components:

Sn2+15-80 g/l

Sb3+0.5 to 20 g/l·j

Cu2+of 0.05-10 g/l

HBF420-200 g/l

the wetting of 0.05-5 g/l,

and possible excipients, which are not included in the resulting layer of the sliding element and through at least one auxiliary substance because of the size of its molecules, the rate of migration of the ions of the elements forming the anti-friction layer is increased so that crystals are formed mainly of tin in the form of globules.

Oka is ALOS, that the receipt of the anti-friction layer so that a predominant portion (>50%) of crystals of tin has a globular structure (not needle-like or columnar structure, as it was until now), is achieved by the uniform structure of the anti-friction layer. Globular structure of crystals of tin can be obtained by increasing the deposition rate by the addition of auxiliary substances with large molecules, in particular gelatin and/or resorcinol, making the composition of the anti-friction layer and the formed structure can be adjusted as desired. Thus, the appropriate use of wetting, which is formed from C13C15-oxaspiro, C16C18fatty alcohol or C13-oxaspiro with a degree of amoxilonline from 10 to 30. The preferred wetting agent is oxaspiro with a degree of amoxilonline 20.

The system according to the invention is extremely homogeneous structure in which a homogeneous and mostly globular, rich in antimony allocation are evenly distributed. This is achieved much more stable anti-friction layer, which can also be used at a thickness appreciably greater than 20 μm, in particular greater than 50 μm, consistently, uniformly and without delaminations. So, you can immediately get antifriction layers of a thickness of, for example, 500 μm.

P is d "globular" in connection with the structures and crystallization should be understood grain, the size of which is such that the ratio of greatest dimension to smallest dimension is <3, preferably <2.

Suitable wetting sold in particular under the name Lutensol by BASF.

In particular, suitable following wetting (EO=the degree of ethoxycarbonyl):

Lutensol AO 11C13C15-oxopent with 11 EO
Lutensol AO 30C13C15-oxopent with 30 EO
Lutensol AT 13C16C18-fatty alcohol with 13 EO
Lutensol AT 25C16C18-fatty alcohol with 25 EO
Lutensol TO 12C13-oxopent with 12 EO
Lutensol TO 20C13-oxopent with 20 EO
Lutensol ON 110C13-oxopent with 20 EO

Particularly suitable for receiving layer according to the invention for a sliding bearing and to prevent the formation of dendrites was wetting Lutensol ON 110 and TO 20. Especially preferred Lutensol ON 110, that is, C13-oxopent with 20 EO.

In one preferred form of implementation cell battery (included) is the slip according to the invention, the proportion of copper in the anti-friction layer is from 3 to 6%. In contrast to the indications for utility model 82 06 353 IM high content of copper leads to the increase in load capacity and fatigue strength anti-friction layer. Therefore, according to the invention can provide a proportion of copper, which not only exceeds the best desired copper content of <0.5 wt.%, but also in General higher than the permissible within the specified maximum copper content up to 2%.

Preferably, the proportion of antimony in anti-friction layer ranged from 8 to 17 wt.%.

Preferably, the proportion of copper ranged from 2%to 7%.

Share with globular form crystals of tin in the anti-friction layer is preferably higher than 70%, even more preferably above 80%.

The sliding element according to the invention may be a conventional cylindrical sleeve bearing, a sleeve bearing or essentially flat element. Defines the shape of the substrate is composed of metal and typically may consist of steel coated with a white metal, which has a protective lubricating properties. This supporting element is applied to the anti-friction layer according to the invention. As the anti-friction layer according to the invention can be applied to a greater thickness with high stability, you can also abandon Babbitt and immediately apply the anti-friction layer directly what about for forming a substrate of metal.

To explain the invention describes the following test results for sample implementation.

Was received basic electrolyte (no wetting) of the following composition:

Sn2+33-35 g/l

Sb3+2,4-3,0 g/l

Cu2+a 0.23-0.26 g/l

HBF435-45 g/l

resorcinol 3-4 g/l

gelatin 0.25 g/l

Resorcinol and gelatin are excipients that affect the composition and deposition rate of the formed layer. Resorcinol is mainly influencing the composition, whereas large molecules of gelatin affect the crystalline structure, surface roughness and composition of the layer. In addition, the concentration of gelatin is advisable to set between 0.1 and 0.5 g/l

Electrolytic deposition was carried out at a constant current of 2 A/DM2using tin electrodes when the bath temperature 22-24°C.

Steel substrate previously covered with a layer of Nickel (electrodeposited).

Deposition SnSbCu was carried out both on a rotating rod electrodes and tin sheets. Deposition on a rotating rod electrodes prevents the uncontrolled growth of dendrites, which could harm the results of the tests.

All tested wetting, which were mentioned above, in contrast to the control standard of wetting, which usually was previously used, lead to a different structure during deposition. Often the spine, significantly reduced the growth of dendrites.

With this in mind particularly advantageous application of the wetting Lutensol ON 110 and Lutensol TO 20.

Thus, with these wetting, particularly preferably applied by wetting can be obtained antifriction layer, which in regard to its crystalline structure, differs from the former anti-friction layers, and provides significant advantages in handling them. In particular, it is possible to obtain a layer of almost any thickness, so this is not a pre-existing freedom in relation to the layer thickness and formation of the slide elements.

1. Item slip defines the shape of the substrate and a deposited galvanically anti-friction layer, which is formed from an alloy components with tin, antimony and copper, the content of which is, wt.%:

antimony5-20
copper0,5-20
tinthe rest,

moreover, the lead content of <0.7 percent, and total content of other components is <0.5 percent, characterized in that the layer for bearing the tin crystals are predominantly globular form.

2. The sliding element is about to claim 1, characterized in that the proportion of copper is from 0.5 to 7%.

3. The sliding element according to claim 2, characterized in that the proportion of copper in the layer for a sliding bearing is from 3% to 6%.

4. The sliding element according to claim 1 or 2, characterized in that the proportion of antimony layer sliding bearing is from 8 to 17%.

5. The sliding element according to claim 1, characterized in that the layer sliding bearing is applied to a thickness of >20 μm.

6. The method of obtaining the item slip by electrolytic deposition of the anti-friction layer of the alloy components with tin, antimony and copper defines the shape of the substrate, characterized in that the use of electrolyte-based forborne acid and perborate metal in an aqueous solution, which contains the following components, g/l:

Sn2+15-80
Sb3+0,5-20
Cu2+of 0.05-10
HBF420-200
the wetting0.05 to 5,the

and possible excipients, which are not included in the output layer for a sliding bearing, and thanks to the auxiliary substance from which and the size of its molecules, the rate of migration of the ions of the elements, forming an anti-friction layer, increases to such an extent that arise crystals of tin, which is mainly globular form.

7. The method according to claim 6, characterized in that the wetting agent is C13C15-oxaspiro,16With18fatty alcohol, or C18-oxaspiro with a degree of amoxilonline from 10 to 30.

8. The method according to claim 7, characterized in that the wetting agent is used oxopent with a degree of amoxilonline 20.

9. The method according to claim 6 or 8, characterized in that the used lubricant in a concentration of 0.1-3.0 g/l

10. The method according to claim 6, characterized in that the rate of electrolytic deposition of 0.3-1.5 μm/min



 

Same patents:

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FIELD: machine building.

SUBSTANCE: friction bearing consists of first element of bearing made out of austenite steel and second element of bearing made out of martensite steel possessing higher hardness. Also the first element corresponds to a padding, surface of which has higher hardness due to treatment by cold deformation of hardening. Additionally the first element is formed with cylinder rims (107, 108) connecting sole of shaft (114) with platform (113), while the second element is formed with bushings (104, 105) positioned in bored orifice of the case (103).

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9 cl, 6 dwg

FIELD: chemistry.

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EFFECT: obtainment of high-temperature dispersed compact iron-based powder materials of enhanced hardness and corrosion resistance.

FIELD: metallurgy.

SUBSTANCE: invention can be used at manufacturing of antifriction bushings. It is prepared charge containing, wt %: tin powder 9.5-10; leady powder 0.5-1.0; graphite 0.3-0.5; powder copper electrolytic - the rest. Charge is pressed and sintered by means of sequential increasing of temperature up to 600°±5C with isolation during 1.5 hours, following increasing of temperature up to 660°C±5°C with isolation during 1.5 hours and cooling on air, by means of blow-off in flow of dissociated ammonia. After sintering it is implemented calibration at specific pressure, equal to compacting pressure, with following iterative sintering by means of following increasing of temperature up to 860°C±5°C with isolation during 1.5 hours and following cooling on air.

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2 cl, 1 dwg

FIELD: machine building.

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21 cl

FIELD: mechanical engineering.

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EFFECT: lowering friction factor and improvement of durability of friction pair.

5 cl, 2 tbl

FIELD: machine building.

SUBSTANCE: invention relates to multilayer compositional materials for plain bearings or bushes which are desirable to use sliding layers not containing lead. Multilayer compositional material contains base layer, layer (3) of bearing metal from copper or aluminium alloy, nickel intermediate layer (2) with thickness exceeding 4 mcm, and sliding layer (1) which contains from 0 to 20 wt %, of copper and/or silver, the remaining part - tin. Sliding layer is obtained by method of galvanic precipitation from methyl sulphoacid electrolytes.

EFFECT: reduction of production-technological expenditures in manufacturing multilayer compositional material, more homogeneous distribution of materials in matrix and, as a result, in case of vibrations - smaller probability of low-melting eutectic regions emergence, increase of operational reliability.

22 cl, 1 tbl, 3 dwg

Alloy on tin basis // 2385966

FIELD: metallurgy.

SUBSTANCE: antifriction alloys on tin basis are used for pouring of bearings. The alloy contains, wt %: copper 7.5-8.5, antimony 7.5-8.5, silicon 0.01-0.02, nickel 0.6-1.0, selenium 0.01-0.02, tin - the rest.

EFFECT: alloy is of high wear resistance.

1 tbl

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