Refractory metal (W,Ti) - refractory carbide (Ti,W)C alloys formed by eutectic solidification from the melt-cermelts -are promising materials for high temperature rocket nozzle applications. At the Center for Laser Applications (CLA) at the University of Tennessee Space Institute (UTSI), these materials are being formed into three-dimensional shapes using various laser powder deposition techniques. Shapes with cylindrical symmetry are built on graphite mandrels by laser melting a continuous powder feedstock mix. Processing is performed inside a Argon atmosphere and the obtained materials have a fully dense microstructure of fine (Ti,W)C dendrites surrounded by the (W,Ti) - (Ti,W)C eutectic. With a melting temperature of 2700 deg C, this microstructure is expected to offer high temperature strength, toughness and erosion resistance at elevated temperatures. The specific axis-symmetric solid freeform fabrication technique, typical processing conditions and a representative set of results are presented herein.
Axis-symmetric solid freeform fabrication of W-TiC cermelt rocket nozzles
Rotationskörper-Freiformen von W-TiC Cermelts-Raketendüsen
2008
10 Seiten, 12 Bilder, 24 Quellen
Aufsatz (Konferenz)
Englisch
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