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1547 |
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Monday, June 02, 2008, Room 05 4:00 PM Powders, Wires, Gases 2 New powder mixtures and cored wires, support and distribution of industrial gases for thermal spraying |
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Characteristics of high-SiC- / high-TiC-containing thermal spray coatings regarding operating conditions |
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Thomas Grund* / Institute of Materials Science and Engineering, IWW, Chemnitz University of Technology, Deutschland Bernhard Wielage / Chemnitz University of Technology, Institute of Composite Materials, Germany Manfred Nebelung/ Fraunhofer Institute for CeramicTechnologies and Systems, IKTS, Germany Sven Thiele/ Fraunhofer Institute for CeramicTechnologies and Systems, IKTS, Germany Andreas Wank/ GTV Verschleiss-Schutz GmbH, Germany Alexander Schwenk/ GTV Verschleiss-Schutz GmbH, Germany |
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Non-oxide ceramics show a multitude of excellent characteristics that are used in many application fields as engineering and reinforcing materials. Especially the very good wear and corrosion resistance ? also in high temperature environments ? as well as physical and mechanical properties are often deciding arguments for their use. The combination of excellent mechanical, thermal and chemical properties of silicon carbide and titanium carbide has made these materials very attractive both for structural ceramics applications and for thermal sprayed coatings. Feedstock spray powders have been developed containing ~30 wt.-% of an alumina-yttrium ceramic binder matrix. The described powders are processed by atmospheric plasma spraying (APS) and high velocity oxygen fuel spraying (HVOF). Feedstock powders and produced coatings are characterized by optical microscopy, X-ray diffractometry (XRD) and scanning electron microscopy (SEM) including energy dispersive X-ray analyses. Characterization regarding operating conditions of applied coatings is done by wear, corrosion and wetting tests. |