Dresden 2014 – wissenschaftliches Programm
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MM: Fachverband Metall- und Materialphysik
MM 38: Structural materials
MM 38.5: Vortrag
Mittwoch, 2. April 2014, 11:15–11:30, IFW B
High-temperature interactions of liquid aluminum with titanium diboride ceramic — •Lixia Xi1, Rafal Nowak2, Ivan Kaban1,3, Bartlomiej Korpala2, Grzegorz Bruzda2, Natalia Sobczak2, Norbert Mattern1, and Jürgen Eckert1,3 — 1IFW Dresden, Institute for Complex Materials, P.O. Box 270116, 01171 Dresden, Germany — 2Foundry Research Institute, Center for High-Temperature Studies, Zakopianska Str. 73, 30-418 Cracow, Poland — 3TU Dresden, Institute of Materials Science, 01062 Dresden, Germany
Temperature-dependent interactions in the liquid Al/TiB2 ceramic system has been investigated by the sessile drop technique in the temperature range from 700 to 1400 C. The microstructure of the Al/TiB2 interfaces in the solidified couples after sessile drop tests has been characterized by scanning electron microscopy, coupled with an energy-dispersive X-ray spectroscopy and X-ray diffraction. Up to about 800 C, pure Al exhibits rather poor wetting and a weak reactivity with TiB2 ceramic; only few titanium aluminide particles were found to be formed at the interface. Starting from 800 C, the wetting improves either with time or upon further heating. Above 1000 C liquid Al completely spreads over the ceramic and penetrates along the TiB2 grain boundaries or into the pores. Al3Ti and Al2O3 were found to precipitate at the interface.