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Cavitation Resistant Niti Coatings with Pseudoelastic Properties Produced by Low Pressure Plasma Spraying (LPPS)

  • : Bitzer, M1
  • : 1Forschungszentrum Juelich GmbH
  • : PDF Download
  • : 2012

Abstract

Cavitation might cause significant wear in technical applications like turbine blades in hydropower plants or pump components. Microstructural damage induced by surface fatigue reduces lifetime and enlarges service costs. Coating of exposed surfaces by wear resistant materials would be highly attractive for extending lifetime of related systems. NiTi is a promising material for such coatings considering its clearly pronounced damping behaviour based on its pseudoelastic properties. In the present work, NiTi layers were produced by Low Pressure Vacuum Plasma Spraying (LPPS, formerly often called Vacuum plasma spraying (VPS)), starting from prealloyed NiTi-powder. Cavitation resistance depending on LPPS parameters, surface treatment and layer thickness was investigated. The study is accompanied by characterization of microstructure and phase transformation behaviour.
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