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| Abstract No.: |
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Scheduled at:
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Wednesday, May 04, 2022, Hall G2 11:30 AM
Arc Spraying
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| Title: |
Potentials of thermal spraying processes in silane doped inert gases
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| Authors: |
Manuel Rodriguez Diaz* / Leibniz University Hannover, Germany
Martin Nicolaus / Institut für Werkstofftechnik, Germany
Kai Möhwald/ Institut für Werkstoffkunde, Germany
Hans Jürgen Maier/ Institut für Werkstoffkunde, Germany
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| Abstract: |
In addition to the proper functional properties, the adhesive strength represents one of the key criteria for industrial use of thermally sprayed coatings. Since conventional thermal spraying processes are almost carried out exclusively in air atmosphere, this leads to the oxidation of the particles and of interfaces within the coatings. As a result, conventional thermally sprayed metallic and metal-ceramic coatings are characterized by heterogeneous microstructures with interlamellar oxide fringes at the interfaces between individual splats and also between the coating and the substrate. This has a decisive influence on the bond strength and on the wear and corrosion protection properties of thermally sprayed coatings. The aim of this study is to present the potentials of thermal spraying processes carried out in a mixture of monosiliane and an inert gas at ambient pressure as an alternative to the known vacuum spraying process in order to prevent oxidation during the coating process. Using the example of arc-sprayed coatings, it is demonstrated that the extremely low oxygen partial pressure in this surrounding medium leads to coatings free of oxide seams with a significantly reduced porosity and significantly enhanced properties.
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