A tin alloy wire

Abstract

The invention discloses a tin alloy wire. The tin alloy wire is characterized in that a molybdenum element with the weight fraction of 0.3-10% is introduced on the basis of a tin-based babbitt alloy base material; the molybdenum element is introduced in the form of molybdenum powder with the surface coated with nickel, the molybdenum powder median particle diameter is 0.5-2.5 microns, and finally,the molybdenum element exists in a wire rod in the state of molybdenum particles; the technical process is carried out until the wire diameter phi is 2.0 mm or below, the tin-antimony hard phase is refined, and the elongation after breaking can reach 10% or above. Tests show that the tin alloy wire can be applied to forming of an oil film bearing bush through MIG and TIG surfacing, the bonding strength of a surfacing layer and the steel backing is remarkably improved compared with that of a conventional centrifugal casting technology; the molybdenum particles are introduced, so that the anti-dry-friction performance of the tin alloy wire is improved, the adhesion tendency of a bearing neck and the babbitt alloy bearing lining during shutdown of a sliding bearing bush is reduced, and the adhesion abrasion of the babbitt alloy bearing lining during starting is reduced; and therefore, compared with a conventional centrifugal casting babbitt alloy bearing bush, the service life of the bearing bush formed by surfacing of the tin alloy wire is remarkably prolonged.

Description

Technical field: [0001] The invention relates to a tin alloy wire used for making a sliding oil film bearing lining material, specifically a tin-based Babbitt alloy wire, which belongs to the technical field of nonferrous metal processing. Background technique: [0002] Sliding bearings are one of the important supporting components in mechanical transmission, and are widely used because of their advantages such as large load capacity, high reliability, and compact structure. The friction-reducing material (bearing lining material) layer in the bearing shell of the sliding bearing is currently mainly made of Babbitt alloy, which is combined with the steel backing (backing) through centrifugal casting. Although there are many advantages; there are also bearing material layers. Poor combination with the matrix, easy segregation of components, easy to produce cracks, looseness and slag inclusion, and non-environmental protection and other defects. In addition, the casting thic...

AI Technical Summary

Problems solved by technology

[0003] Although the arc surfacing technology has many advantages in the manufacture of sliding oil film bearings, it was found during the study of its failure analysis that during the shutdown of some heavy-duty machines, the contact static pressure between the journal and the surface of the bearing was very large, and no oil film was formed between them. When there is direct contact, tin, antimony, copper and other non-ferrous metal atoms are easy to diffuse into the surface of the journal, and then the surface of the journal and the bearing pad are bonded. When the machine is started again, the rotation of the journal will take away part of the material on the surface of the bearing pad. However, obvious adhesive wear occurs, causing damage to the bearing bush, especially for some devices that need to be started frequently, such as high-power wind power spindles, etc., which will lead to a sharp decrease in service life

[0004] On the other hand, the traditional tin-based babbitt alloy matrix with antimony copper as the main alloying element has low strength and poor creep resistance. The bearing bush is easily deformed locally, which reduces the thickness of the dynamic pressure oil film, and the deformed raised part even directly contacts with the journal to cause dry friction, resulting in damage to the bearing bush and reducing the life of the bearing.

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