Effect of Feedstock Characteristics and Operating Parameters on the Properties of Cr2O3 Coatings Prepared by Suspension-HVOF Spraying

Monday, May 11, 2015: 3:30 PM
Room 102B (Long Beach Convention and Entertainment Center)
Dr. Filofteia-Laura Toma , Fraunhofer IWS, Dresden, Germany
Mr. Stefan Scheitz , Fraunhofer Institute for Material and Beam Technology (IWS), Dresden, Germany
Mr. Richard Trache , Technische Universität Dresden, Dresden, Germany
Stefan Langner , Fraunhofer Institute for Material and Beam Technology (IWS), Dresden, Germany
Prof. Christoph Leyens , Technische Universität Dresden, Dresden, Germany
Dr. Annegret Potthoff , Fraunhofer IKTS, Dresden, Germany
Mrs. Kathrin Oelschlägel , Fraunhofer IKTS, Dresden, Germany
Chromium(III)oxide is a widely used coating material for applications in the printing, paper and textile industry, in pumps and mechanical sealing systems. Cr2O3 coatings offer high hardness, excellent sliding wear performance and corrosion resistance. Suspension-HVOF process (S-HVOF) allows production of dense, finely structured coatings with smooth surfaces and improved mechanical properties.

The current work proposes from one side a study on the development of ready-to-spray aqueous Cr2O3 suspensions and their properties (particle size distribution, viscosity, stability) and from other side the effect of suspension characteristics and operating parameters (gas composition, spray distance, substrate temperature) on the microstructure, mechanical properties and deposition efficiency of the S-HVOF Cr2O3 coatings. The suspension hardware components were developed by Fraunhofer IWS. By appropriate choice of the suspension and spraying parameters Cr2O3 coatings with thicknesses higher than 150 µm and microhardness > 1700 HV0,3 were produced.

See more of: Suspension & Solution Thermal Spray
See more of: Fundamentals/R&D