Laser cladding copper-based self-lubricating coating applied to wind power sliding bearing and preparation method of laser cladding copper-based self-lubricating coating

By using a mixture of nickel-clad graphite and tin bronze powder in wind-electric sliding bearings and combined with laser cladding technology, the toxicity problem of lead-containing materials in traditional copper-based sliding bearing alloys and the heat loss and metallurgical bonding problems in laser cladding technology are solved, and the copper-based/graphite self-lubricating coating is achieved and the hardness and friction reduction of the coating are improved.

CN119640257APending Publication Date: 2025-03-18SHANGHAI JIAOTONG UNIV +1
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Patent Information

Application Number
CN202411818979.3
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2024-12-11
Publication Date
2025-03-18

AI Technical Summary

Technical Problem

In wind-powered sliding bearings, the lead-containing materials in traditional copper-based sliding bearing alloys are limited due to toxicity and contamination, and the laser cladding process has problems such as heat loss, poor metallurgical bonding, and the coating is prone to cracks and holes when preparing copper-based/graphite self-lubricating coatings.

Method used

The nickel-clad graphite and tin bronze powder are mixed in a specific proportion. After ball milling and drying, a copper-based/graphite self-lubricating coating is prepared using a laser cladding process to improve the bonding strength and forming quality of the coating.

Benefits of technology

The copper-based/graphite self-lubricating coating is achieved with good forming, crack-free, low porosity and good bonding with the substrate, while improving the hardness and friction-reducing properties of the coating.

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Abstract

The invention belongs to the field of metal coatings, and particularly relates to a laser cladding copper-based self-lubricating coating applied to a wind power sliding bearing and a preparation method of the laser cladding copper-based self-lubricating coating, and coating powder comprises the following chemical components in percentage by mass: 1-10% of nickel-coated graphite and the balance of tin bronze. The invention further discloses a preparation method of the coating, and the copper-based composite coating with excellent antifriction and wear resistance is prepared by optimizing the adding amount of nickel-coated graphite and adopting a laser cladding method. Compared with an original tin bronze coating, the hardness of the copper-based self-lubricating coating prepared through the method is improved, and the antifriction performance is obviously improved on the basis that the abrasion resistance is guaranteed. In addition, the coating is good in forming, free of cracks, low in porosity and good in combination with the substrate, and the technical problem that an existing laser cladding process is applied to the copper-based / graphite self-lubricating coating is solved.
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