Development of Suspension Feedstocks for Thermally Sprayed Zn2TiO4 Coatings

Publikation: Beitrag in FachzeitschriftForschungsartikelBeigetragenBegutachtung

Beitragende

  • Anja Meyer - , Fraunhofer-Institut für Keramische Technologien und Systeme (Autor:in)
  • Filofteia Laura Toma - , Fraunhofer-Institut für Werkstoff- und Strahltechnik (Autor:in)
  • Oliver Kunze - , Professur für Werkstofftechnik, Fraunhofer-Institut für Werkstoff- und Strahltechnik (Autor:in)
  • Andreas Böhme - , Fraunhofer-Institut für Keramische Technologien und Systeme (Autor:in)
  • Björn Matthey - , Fraunhofer-Institut für Keramische Technologien und Systeme (Autor:in)
  • Annegret Potthoff - , Fraunhofer-Institut für Keramische Technologien und Systeme (Autor:in)
  • Arno Kaiser - , Fraunhofer-Institut für Keramische Technologien und Systeme (Autor:in)
  • Tim Gestrich - , Fraunhofer-Institut für Keramische Technologien und Systeme (Autor:in)
  • Christoph Leyens - , Professur für Werkstofftechnik, Fraunhofer-Institut für Keramische Technologien und Systeme (Autor:in)

Abstract

By adjusting the thermal spraying suspension technology, coatings with excellent microstructure, surface morphology, and phase composition can be obtained to meet the application needs in mechanical, electrical or friction fields. The use of suspensions as feedstock material allows a high degree of flexibility with regard to the chemical composition of the sprayed coatings. Moreover, suspension thermal spraying (STS) is a promising technique for the production of coatings, the use of which was previously limited by expensive starting materials. A mixture of less expensive starting materials in the suspension and an "in situ" reaction to the desired product during the spraying process make this possible. Zn2TiO4 coatings are one example where the high costs of blended oxide powders as feedstock material hinder the market introduction, whereas their outstanding electrical properties and photocatalytic activity are of great interest for various industrial applications. In this work, single oxides ZnO and TiO2, Zn acetate salt as ZnO precursor, as well as a Zn2TiO4 powder were used to develop tailored aqueous suspension feedstocks suitable for thermal spraying. To follow the formation of the compositions in the system ZnO-TiO2, differential thermal analysis (DTA) measurements were performed. Preparation routes of stable suspensions and suspension-solution mixtures with low sedimentation rates, low viscosities and good flowabilities are discussed. Microstructures and phase compositions of sprayed coatings are shown, and the “in situ” formation of Zn2TiO4 phase during Suspension High Velocity Oxygen Fuel Spraying (S-HVOF) is demonstrated. This work shows the high potential of suspension feedstocks from single oxide raw materials to obtain Zn2TiO4 sprayed coatings.

Details

OriginalspracheEnglisch
Seiten (von - bis)502-513
Seitenumfang12
FachzeitschriftJournal of thermal spray technology
Jahrgang32
Ausgabenummer2-3
PublikationsstatusVeröffentlicht - März 2023
Peer-Review-StatusJa

Schlagworte

Schlagwörter

  • feedstock preparation, microstructure, phase composition, solution precursor spraying, suspension, suspension spraying, zinc Titanium Oxide