Tribological characteristics of composite coatings formed by laser cladding of powders of nickel self-fluxing alloy and bronze

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• 作者：E. E. Feldshtein ; O. G. Devojno ; M. A. Kardapolava…
• 关键词：laser cladding ; composite coating ; nickel alloy ; bronze ; coefficient of friction ; wear rate
• 刊名：Journal of Friction and Wear
• 出版年：2016
• 出版时间：September 2016
• 年：2016
• 卷：37
• 期：5
• 页码：454-461
• 全文大小：1,980 KB
• 刊物类别：Physics and Astronomy
• 刊物主题：Physics
  Mechanics, Fluids and Thermodynamics
  Russian Library of Science
  
• 出版者：Allerton Press, Inc. distributed exclusively by Springer Science+Business Media LLC
• ISSN：1934-9386
• 卷排序：37

文摘

Microstructures, coefficients of friction, and relative wear of composite coatings based on the PG-12N-01 nickel self-fluxing alloy and PG-19M-01 bronze have been considered. It has been found that composite coatings have a complex structure. The bronze coating, which is deposited on the fillets of the nickel alloy, crystallizes in a form of dendrites with axes arranged under an angle of 45°. The nickel alloy has a globular-dendritic structure with the eutectic component crystallizing between its branches. Momentary coefficients of friction in conditions of the concentrated load are independent of the cladding rate, and their values are 0.08–0.12 depending on the load. In this case, the wear rate of coatings depends substantially on the laser cladding. Under conditions of the distributed contact, bilayer coatings have a considerable advantage, and the relative wear is reduced by several tens of times compared with single-layer ones.