Abstract No.:
2774

 Title:
Ultrasound-assisted particle detachment in wire arc spraying

 Authors:
Christian Rupprecht* / Chemnitz University of Technology, Germany
Gerd Paczkowski / Institute of Materials Science and Engineering, IWW , Germany
Bernhard Wielage/ Institute of Materials Science and Engineering, IWW , Germany

 Abstract:
The microstructure and the mechanical properties of wire-arc-sprayed coatings strongly depend on particle parameters such as velocity, temperature and their distribution. These properties are mainly influenced by the size of the atomised droplets and the spray system characteristics. The particle size is usually optimised by varying the gas flow velocity and the conditions for the secondary atomisation in the free jet. This work shows a new strategy for taking direct influence on the primary forming of droplets. For this reason, an ultrasonic generator is coupled to the wire, which transfers mechanical oscillation. Depending on the amplitude, the frequency and the free length of the wire tip, standing waves can be formed which facilitate the droplet detachment. The influence of the mechanical stimulation of the molten material and the arc are shown by high-speed camera images and verified by microstructure analysis of the coating. Different applications as well as the use of different feedstock materials are discussed.

<= go back