DE2722144A1 - WHITE METAL BEARING ALLOY, IN PARTICULAR FOR USE AS A SLIDING LAYER, BASED ON LEAD, TIN, AND COPPER FOR THE PRODUCTION OF MULTI-LAYER SLIDING BEARINGS - Google Patents

Description

27221U PATENT Attorney DIPL.-PHYS. HEINRICH SEIDS

62 Wiesbaden Bierstadler Höhe 15 - P.O. Box 1206 Telephone (06121) 56 53 Postal check Frankfurt / Main 1810 08 -602 Bank Deutsche Bank 395 63 72 Nass. Sparkasse 108 00 30

Wiesbaden, May 12, 1977 G 384 S / m

Patent application

Applicant: Glyco-Metall-Werke Daelen & Loos GmbH 6200 Wiesbaden-Schierstein

Designation: White metal bearing alloy, in particular for use as a sliding layer, based on lead, tin, copper for the production of multi-layer plain bearings

Addition to: -.- Elimination from: -.-

Exhibition priority: -.- Union priority: -.-

Date:

Country:
File number:

809847/0316

Glyco-Metall-Werke G 384

PATENT ADVOCATE DIPL.-PHYS. HEINRICH SEIDS

62 Wiesbaden · Bierstadter Höhe 15 ■ Postfach 1206 · ■ Telephone (06121) 56 53 »2 Post check Frankfurt / Main ISlO 08 -602 · Bank Deutsche Bank 395 63 72 · Nass. Sparkasse 108 00 30 65

Wiesbaden, May 12, 1977

The invention relates to a white metal bearing!

alloy, essentially based on lead, tin, copper, in particular for the production of sliding bearing elements with a metallic support body. For a white metal bearing alloy which is based on the alloy components mentioned above, an optimum limit for the copper content of 6 % has been assumed up to now. A higher copper content occurs only with lead-free or low-lead alloys.

T ^he is in the presence of Cu / reason for this - to see crystals with more than 6% copper cause a strong decrease in ductility - Sn ^. In order to obtain a favorable ductility in these alloys, the Cu content of 0.5% to 6 % was provided.

In the case of lead-based white metal alloys, a limit for the Sn and Cu content was established, which is 10 % Sn and 3% Cu, in order to achieve favorable values with regard to wear and fatigue resistance at high loads and high sliding speeds.

Practice has shown, however, that the results achieved with regard to higher requirements recently the fatigue resistance and the wear resistance are not always satisfactory, so that

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Dipl.Phys. Heinrich Seids patent attorney Bierstadtcr Höhe IS PO Box 5105 - 6200 Wiesbaden 1 · ® "(06121) 5653 82 j

there is a need for an improved alloy.

The object of the invention is therefore to provide a white metal bearing alloy for multi-layer plain bearings with significantly improved properties for internal combustion engines, for example for charged diesel engines, gasoline engines with injection or turbocharging create, which can absorb the higher loads that occur.

This object is achieved according to the invention in that the predominantly electrochemically produced lead-containing sliding layer is predominantly made of a lead-containing ternary alloy (in percent by weight) with 6 to 20 % tin, 6 to 10 % copper, in particular 14 % tin, 8 % copper, The remainder is lead. The white metal layer can preferably have a layer thickness of 0.002 mm to 0.05 mm, in particular, for example for automotive engines at approximately 90 ° to 15O ⁰ C lubricant inlet temperature, at full load, 0.012 mm, on the other hand for marine diesel engines (with lower lubricant temperature) to ca. 0.05 mm.

By increasing the copper content, a higher wear resistance is achieved in an advantageous, known manner. The specialist literature such as "Metals Handbook", Ed. ..... 1961, pp. 854 to 859, as well as DT-PS 844 ^ 664, DT-AS

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Dlpl.-Phys. Heinrich Seids patent attorney Bierstadter Hohe 15 ■ P.O. Box 5105 ■ 6200 Wiesbaden 1 · ® (0 6121) 56 53 62 ^!

10 48 757 and DT-AS 11 61 434 clearly limit the copper content (in percent by weight) for sliding layers to approx. 6 % and preferably 2 to 3 %, so that the fatigue strength does not drop too far into the critical range. Contrary to the widespread opinion of experts that the fatigue strength drops sharply when the percentage copper content is increased, it was surprisingly found that when the copper content is increased in the range from 6 to 10 %, the fatigue strength hardly suffers if the

! Tin content increased by approx. The same percentage. Although this increased tin content, according to previous opinion, causes the solidus point to drop, no disadvantageous phenomena occurred even at increased operating temperatures (lubricant inlet temperature 170 ° C.) under alternating loads. Only at a Cu content of approx. 15 % do small cracks appear even under constant load.

Systematic serial investigations have already shown that with an increased copper and tin content according to the invention In the lead-based sliding layer, the long-term load capacity can be positively influenced, as shown by the Figure 1 is clarified. There the layer thickness decrease is dependent on the running time for three alloys shown:

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Dipl.-Phys. Heinrich SeIcU patent attorney Bierstadter Höhe 15 - rostfach 5105 - 6200 Wiesbaden 1QP (061 21) 565302

Alloy A: 10% Sn 2% Cu rest Pb Alloy B: 13% Sn 5% Cu rest Pb Alloy C: 16 % Sn 8 % Cu rest Pb (oil inlet temperature 130 ° C bearing load on all

Try 60 N / mm, alternating)

For alloy A, the ratio is with different starting thicknesses (12 / µm and 20 / µm).

The service life of a plain bearing using this inventive lead-containing white metal sliding layer With an increased Cu content it can be increased if an additional special running-in layer (e.g. sulphide layer) used as a top layer and / or an additional intermediate layer (e.g. nickel-tin alloy) is underlaid.

In the inventive white metal bearing alloy, antimony and / or arsenic and / or cadmium can just as successfully be added to the constituent copper . Is said white metal alloy made by casting, preferably find so thicker layers are used, while advantageous additives are used up to 7% Sb, 2% Cd and / or 2% As.

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Dlpl.-Phys. Heinrich Seids Patent Attorney · Bierstadter Höhe 15 - Postfach 5105 - 6200 Wiesbaden 1 ■ ζ? (061 21) 565362 |

Two embodiments for multilayer plain bearings with I.

White metal bearing alloys according to the invention are shown in FIGS. There are:

Fig. 2 is a perspective view of a bearing

half;
FIG. 3 is a partial section corresponding to III-III of FIG. 2

and
Fig. 4 is a partial section according to III-III of Fig. 2 in

modified embodiment.

In the multi-layer bearing shown in FIG. 3, a metallic support body 1, preferably made of steel, is provided. A metallic intermediate layer 2 with emergency running properties, for example made of lead bronze or tin bronze, is applied to this support body 1. This intermediate layer 2 is in turn covered with a hard, wear-resistant sliding layer 3 made of a nickel-tin alloy of, for example, 65 % tin and 35 % nickel. This sliding layer 3 can have a thickness of 0.006 to 0.1 mm. The white metal sliding layer 4 is placed over this hard, wear-resistant sliding layer 3. This sliding layer 4 is formed from a lead-tin-copper alloy, which has a copper content between 6 and! 10 % . The entire bearing half that is, the support body 1 with its layers 2, 3, 4 is of one

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Dlpl.-Phys. Heinrich Seids patent attorney ■ Bierstadter Höhe 15 · Postfach 5105 ■ 6200 Wiesbaden 1 · S "(06121) 565352 '

preferably galvanically applied corrosion layer of tin or tin-lead alloy surrounded, such as this is indicated at 5 in FIG. It is a thin flash that is on the surface 5 of the sliding layer 4 hardly appears, but ins-; especially in the area of the support body 1 an effective one

'Offers corrosion protection.

In the example in FIG. 4, an intermediate layer 2 with emergency running properties, for example 10, is on the support body 1 wise applied from lead or tin bronze. These

Intermediate layer 2 carries the sliding layer 4 formed from lead-containing white metal j, which in turn is formed from a lead-tin-copper alloy, for example one; Composition of 14% tin, 8 % copper, the remainder lead. Ii5 between the intermediate layer 2 and the sliding layer 4 j, a thin nickel layer 6 is attached as a diffusion barrier layer. In this example, the sliding layer 4 is covered by a running-in layer 7. This running-in layer 7 is formed in this example in that alloy components have been converted into sulfides on the surface of the sliding layer 4, that is to say into lead sulfide and copper sulfide. The run-in layer 7 formed in this way can have a thickness between approximately 0.1 μm and 2 μm, preferably between 0.5 μm and 1.0 μm.

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Claims (9)

27221U Glyco-Metall-Werke G 384 PATENTANWALT DIPL.-PHYS. HEINRICH SEIDS 62 Wiesbaden ■ Bierstadter Höhe 15 rostfach 12068 · Telephone (0 61 21) 56 53 82 Postscheck Frankfurt / Main 181008-602 · Bank Deutsche Bank 395 63 72 · Nass. Sparkasse 108003065 Wiesbaden, May 12, 1977 Claims: 1) White metal bearing alloy based on lead, tin, copper, in particular for the production of sliding layers for multilayer plain bearings, characterized by a lead-containing ternary alloy (in weight percent) with 10 % to 20 % tin, 6 % to 10 % copper , especially 14% tin, 8 % copper, the remainder lead. 2) white metal bearing alloy according to claim 1, characterized in that while maintaining a Gesamtge-, haltes between 6% and 10% of copper in addition to 7%! Antimony and / or 2 % arsenic and / or 2 % cadmium are present. \ 3) Multi-layer plain bearing with bearing sliding layer White metal according to claim 1 or 2, characterized in that the white metal has a layer thickness of 0.002 mm to 0.05 mm, : 4) multilayer sliding bearing according to claim 3, in particular for motor vehicle engines, characterized in that j the layer thickness of the white metal bearing alloy is approximately 0.012 mm. 80984 7/0316
ORIGINAL INSPECTED Dipl.-Phys. Heinrkh Schis 1'JIrI ₁ I ₁ InWJU-UiITSLUIIITHOhOlS-I ¹ OStI ₁ HIiSIOS 6200 Wiesbaden 1 · <3? (0 61 21) 56 53 5) multilayer sliding bearing according to claim 3, in particular ship diesel engines or stationary engines, thereby characterized in that the layer thickness of the white metal bearing alloy is up to about 0.05 mm. 6) Multi-layer plain bearing according to one of the claims! 3 to 5, characterized in that the layer structure of the warehouse is composed of: a) a metallic support body (1), b) possibly one or more metallic intermediate layers (2), c) possibly a diffusion barrier layer (6) and d) a lead-containing white metal sliding layer (4) according to claim 1 and e) possibly a corrosion protection layer (5). 7) multilayer sliding bearing according to claim 6, characterized in that the lead and copper-containing White metal sliding layer (4) with a hard, wear-resistant sliding layer (3), for example made of Nickel-tin alloy is underlaid " 8098A7 / 0316 Dipl.-Phys. Heinrk + i Seids patent attorney Bierstacltcr Höhe 15 l'ostfacli 5 105 6200 Wiesbaden 1 · <5? (0 61 21) 56 53 8) Hehrschichtlager according to claim 6 or 7, characterized in that the lead and copper White metal sliding layer (4) with a running-in layer (7), for example a layer of sulfides or phosphides in the white metal sliding layer (4) contained alloy components, is covered. 9) Multi-layer sliding bearing according to one of claims 3 to 8 with white metal sliding layer, produced by a casting process, characterized in that the white metal bearing alloy additionally up to (in percent by weight) 7 % antimony and or or 2 % cadmium and or "or 2 % Contains arsenic. R098A7 / 0316