Study of the possibilities of using the method structural engineering of multilayer periodic systems to increase the mechanical properties of the coating, used as a protective on the details of the steam turbine aggregates
DOI:
https://doi.org/10.15587/1729-4061.2015.43668Keywords:
a steam turbine aggregate, a multilayer coating, nitride, metal, texture, hardness, abrasion resistanceAbstract
The technological conditions and structural condition necessary to obtain high mechanical properties of plasma-vacuum multilayer coatings built on a combination of solid (nitride) and plastic (metal) layers were considered. The advantages of using such a composition as a surface protective layer on parts of steam turbine units were analyzed. It is established that a negative bias potential applied to the substrate during deposition process leads to increased compressive stresses and the formation of preferential orientation of the crystallites in the layers of TiN with [111] axis. As a result there is an increase of hardness from 26 GPa (Us = -70 V) to 36 GPa (Us = -230 V). Using a structured approach, defined and justified optimal layer thickness Ti (30 nm) and TiN (300 nm), providing a combination of high hardness and high abrasion resistance of coatings of the multilayer TiN/Ti.
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Copyright (c) 2015 Олег Валентинович Соболь, Виталий Владимирович Дмитрик, Николай Андреевич Погребной, Григорий Иванович Ищенко, Наталия Владимировна Пинчук, Андрей Александрович Мейлехов
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