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Use of a copper zinc alloy

Inactive Publication Date: 2008-09-11
DIEHL METAL STIFTUNG & CO KG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0010]Apart from the low friction coefficient and a good wear resistance, it has been found that the claimed copper zinc alloy has a surprisingly good thermal stability. This unexpected combination of material properties makes use as a material for sliding bearings possible for the first time.

Problems solved by technology

However, a high friction coefficient is disadvantageous for the use of a material as a sliding bearing, since a high friction coefficient describes a strong interaction between the sliding bearing and its surroundings and is also expressed by a great tendency to jam during the sliding operation.

Method used

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Embodiment Construction

[0012]The alloy has a microstructure which comprises an alpha mixed crystal component and a beta mixed crystal component.

[0013]In an advantageous development, the copper zinc alloy for use as a material for sliding bearings comprises 68-72.5% copper, 5.8-8.5% manganese, 3.6-6.3% aluminum, 0.5-3.3% silicon, 0.2-2.5% iron, 0.2-1.9% lead, 0-1.5% nickel, 0-0.4% tin, residual zinc and unavoidable impurities.

[0014]The microstructure of the developed alloy produced according to DE 29 19 478 C2 comprises an alpha and beta mixed crystal matrix with up to 60-85% alpha phase. The microstructure also includes hard intermetallic compounds, for example iron-manganese silicides. The alpha phase is decisive for the thermal stability of the alloy.

[0015]Sliding bearings of this alloy have a particularly high wear resistance, which is even much higher than that of the alloy CuZn31Si1. The low dry frictional wear in the case of sliding bearings of said alloy results in better behavior under inadequate ...

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Abstract

A copper zinc alloy that is used as a material for a sliding bearing wherein the alloy comprises 59-73% copper, 2.7-8.5% manganese, 1.5-6.3% aluminum, 0.2-4% silicon, 0.2-3% iron, 0-2% lead, 0-2% nickel, 0-0.4% tin, residual zinc and unavoidable impurities.

Description

CROSS-REFERENCE TO RELATED APPLICATION[0001]This application is a continuation application of PCT / EP2006 / 002945; filed Mar. 31, 2005.BACKGROUND OF THE INVENTION[0002]1. Field of the Invention[0003]The invention relates to a copper zinc alloy, which is employable for sliding bearings.[0004]2. Discussion of the Prior Art[0005]Among the requirements for a material that is intended to be used as a sliding bearing, the material must possess a low friction coefficient in order to avoid “jamming” and a high wear resistance in order to obtain a long service life. For a sliding bearing in an internal combustion engine, there are currently used copper zinc alloys of the type CuZn31Si1. However, the properties of the CuZn31Si1 alloys no longer meet the requirements that are imposed on materials for sliding bearings in modern engines, for instance, diesel engines. In such diesel engines, the operating temperature of the sliding bearings may reach and exceed 300° C. The employed copper zinc allo...

Claims

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Application Information

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IPC IPC(8): C22C9/00
CPCC22C9/04C22C9/00C22C9/01F16C2204/10F16C33/06F16C33/121C22C9/10F16C2204/14C22C9/05
Inventor GAAG, NORBERT
Owner DIEHL METAL STIFTUNG & CO KG
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