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M: Metallphysik

M 9: Symposium Complex Metallic Alloys II

M 9.4: Talk

Friday, March 4, 2005, 16:00–16:15, TU H1058

Structures and Properties of the Refractory Silicides Ti₅Si₃ and TiSi₂ — •Georg Frommeyer and Rainer Rosenkranz — Max-Planck-Institut für Eisenforschung GmbH, Düsseldorf, Germany

The refractory titanium silicides Ti₅Si₃ and TiSi₂ with complex hexagonal D8₈ and orthorhombic C54 lattice structures exhibit some superior physical and mechanical properties, such as high lattice energies and melting temperatures; high hardness, elastic stiffness and flow stresses; low densities and excellent creep and oxidation resistance. In addition titanium silicides possess appropriate electrical and thermal conductivity, and good compatibility to silicon and titanium substrates. Therefore, these silicides are also suitable for electronic interconnections, diffusion barriers and graded bioactive glass coatings The complex lattice structures and a large constribution of covalent bonding to the total binding energies of these compounds predestine these less common quasi intermetallics to be considered for high-temperature applications in the aviation and space industry.