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| Abstract No.: |
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Scheduled at:
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Thursday, May 22, 2014, Hall H2 2:40 PM
Powders, Wires, Suspensions
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| Title: |
Demands and economic aspects of thermal spraying with suspensions: An overview
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| Authors: |
Filofteia-Laura Toma* / Fraunhofer IWS, Germany
Lutz-Michael Berger/ Fraunhofer Institute IWS, Germany
Annegrett Potthoff/ Fraunhofer Institute IKTS, Germany
Stefan Langner/ Fraunhofer Institute IWS, Germany
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| Abstract: |
Thermal spraying with liquid suspensions (suspension spraying) is a new technology in the group of thermal spray processes. It makes use of suspensions instead of powders and is mainly applied to APS and HVOF processes. Besides, finely dispersed materials with particle sizes ranging from nanometers to a few micrometers can be processed directly without the need for preparation of feedstock powders. Apart from development of suitable suspensions, adaptation of the system equipment for feeding and injection of the suspension is necessary. The advantages and application potential of suspension-sprayed coatings are multitudinous: possibility of preparing coatings with thicknesses of a few µm, which cannot be achieved through the use of powders; tailored coating architecture that can be adapted to the given application; less anisotropy and lower surface roughness; retention of the initial crystalline phases resulting in improved or new coating properties . Suspension sprayed ceramic coatings show an increasing potential for the preparation of thermal spray barrier coatings, SOFC systems, photocatalytic active coatings, biomaterials, coatings for electrical applications, etc. Economic parameters such as solid content, suspension feed rates, deposition rates and coating thickness deposited per pass lie in ranges enabling cost effective coating manufacturing.
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