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Tuesday, June 24, 2008 - 9:00 AM

Properties of Mo- and Nb-Based Silicide Materials

S. Drawin, ONERA, Chatillon, France; M. Heilmaier, University of Magdeburg, Magdeburg, Germany; P. Jéhanno, Plansee SE, Reutte, Austria; D. Hu, The University of Birmingham, Birmingham, United Kingdom; P. Belaygue, Turbomeca, Bordes, France; P. Tsakiropoulos, University of Sheffield, Sheffield, United Kingdom; M. Vilasi, Université Nancy 1, Vandoeuvre, France; J. Y. Guédou, SNECMA, Moissy Cramayel, France; P. Novak, Walter Engines a.s., Praha, Czech Republic; N. Jones, Rolls-Royce plc, Derby, United Kingdom; S. Sabbadini, Avio S.p.A, Rivalta Torino, Italy

Increasing the temperature capability of turbine airfoil materials has been identified as a major requirement to develop efficient and clean aircrafts. The development of new alloys offering increases of metal surface temperatures by at least 150°C over the presently used Ni-base single-crystal superalloys capability is of strategic importance.

The ULTMAT (Ultra High Temperature Materials for Turbines) project has started in January 2004 in the frame of the European FP6, and will end in June 2008. Expected achievement of the project is a thorough evaluation of the capability of refractory metal (Nb and Mo) silicide based multiphase materials to withstand future enhanced temperature turbine service conditions (up to 1300°C), relying on mechanical, microstructural and environmental investigations in close relation with industrial scale material processing and component fabrication technologies.

The paper will present the main results currently obtained. Base materials for the alloy development are the metal/intermetallic ductile/brittle systems, more precisely the two-phase Nb-Nb5Si3 system and the three-phase Mo-Mo3Si-Mo5SiB2 system. Improvements in creep resistance and oxidation resistance at high temperature (in the range 1000-1300°C) have been obtained. Processing routes have been developed (ingot metallurgy and powder metallurgy) that have allowed the manufacture of complex shaped parts (turbine blades).


Summary: Main results obtained within the EU-funded ULTMAT project (2004-2008) are presented: high temperature creep resistance and oxidation resistance of Nb-Si and Mo-Si-B based alloys manufactured by ingot and/or powder metallurgy, as well as manufacture/machining of complex shaped parts (turbine blades).