Demands, Potentials, and Economic Aspects of Thermal Spraying with Suspensions: A Critical Review

Publikation: Beitrag in FachzeitschriftForschungsartikelBeigetragenBegutachtung

Beitragende

  • Filofteia Laura Toma - , Fraunhofer-Institut für Werkstoff- und Strahltechnik (Autor:in)
  • Annegret Potthoff - , Fraunhofer-Institut für Keramische Technologien und Systeme (Autor:in)
  • Lutz Michael Berger - , Fraunhofer-Institut für Keramische Technologien und Systeme (Autor:in)
  • Christoph Leyens - , Professur für Werkstofftechnik, Fraunhofer-Institut für Werkstoff- und Strahltechnik, Technische Universität Dresden (Autor:in)

Abstract

Research and development work for about one decade have demonstrated many unique thermal spray coating properties, particularly for oxide ceramic coatings by using suspensions of fine powders as feedstock in APS and HVOF processes. Some particular advantages are direct feeding of fine nano- and submicron-scale particles avoiding special feedstock powder preparation, ability to produce coating thicknesses ranging from 10 to 50 µm, homogeneous microstructure with less anisotropy and lower surface roughness compared to conventional coatings, possibility of retention of the initial crystalline phases, and others. This paper discusses the main aspects of thermal spraying with suspensions which have been taken into account in order to produce these coatings on an economical way. The economic efficiency of the process depends on the availability of suitable additional system components (suspension feeder, injectors), on the development and handling of stable suspensions, as well as on the high process stability for acceptance at industrial scale. Special focus is made on the development and processability of highly concentrated water-based suspensions. While costs and operational safety clearly speak for use of water as a liquid media for preparing suspensions on an industrial scale, its use is often critically discussed due to the required higher heat input during spraying compared to alcoholic suspensions.

Details

OriginalspracheEnglisch
Seiten (von - bis)1143-1152
Seitenumfang10
FachzeitschriftJournal of thermal spray technology
Jahrgang24
Ausgabenummer7
PublikationsstatusVeröffentlicht - 1 Okt. 2015
Peer-Review-StatusJa

Schlagworte

Schlagwörter

  • concentrated suspension, economic aspects, hardware development, process stability, suspension thermal spraying