The European ULTMAT project: Properties of new Mo- and Nb-silicide based materials
- PDF / 394,550 Bytes
- 6 Pages / 595 x 842 pts (A4) Page_size
- 78 Downloads / 152 Views
1128-U07-11
The European ULTMAT project: Properties of new Mo- and Nb-silicide based materials Stefan Drawin ONERA, Metallic Structures and Materials Department, 92320 Châtillon, France ABSTRACT The development, in the frame of the European ULTMAT project, of alloys offering at least 150°C surface temperature increase above the Ni-based superalloys’ capability is presented. The expected achievement of the project is a thorough evaluation of the capability of refractory metal (Nb and Mo) silicide based multiphase materials to withstand enhanced temperature turbine service conditions (up to 1300°C). This is based on microstructural, mechanical, physical and environmental investigations in close connection with industrial scale material processing and component fabrication technologies. The paper presents an overview of the project results. Base materials are the metal/intermetallic ductile/brittle composites in the Nb-Nb5Si3 and Mo-SiB systems. Improvements in high temperature creep resistance (up to 1300°C) as well as oxidation resistance (700°C to 1300°C) have been obtained. Processing routes have been developed (ingot and powder metallurgy) that allowed the manufacture of complex shaped parts. INTRODUCTION Developing cleaner aero-engines, with low specific fuel consumption (SFC) and emissions, is an objective of industry and government agencies [1] and one of the drivers of the “Aeronautics and Space” thematic priority within the European 6th Framework Programme (FP6). This issue has been addressed by advanced engine architectures and cycle designs, novel combustor designs, optimised aerodynamics and new cooling concepts, while hot section materials development has clearly contributed to performance gains. Increased turbine airfoil materials temperature capability would allow significant performance enhancements. In this context, the ULTMAT (ULtra high Temperature MAterials for Turbines) FP6 project (2004-2008) aims at providing a sound technological basis for the introduction of new materials, namely Mo- and Nb-silicide based multiphase alloys, which will allow a significant increase (ca. 150°C) in airfoil material operating temperature in aircraft/rotorcraft engines over those possible with Ni-based single-crystal superalloys. The increased capability will allow reduction of SFC, CO2 emissions, and cooling air requirement, the latter leading to a further increase in efficiency and reduction in component weight. The consortium (Table I) has been built up to bring together highly skilled companies, universities and research institutes involved in research and development of high temperature (HT) materials for turbine engines. This paper presents the main project achievements, focusing on alloy development for improved HT creep and oxidation resistance, and alloy processing and fabrication. Table I. Participants in the ULTMAT project.
▪ ONERA (coordinator), F ▪ Plansee SE, A ▪ Turboméca, F ▪ University of Magdeburg, D ▪ University of Surrey, UK
▪ Avio S.p.A., I ▪ Electricité de France, F ▪ Rolls-Royce plc, UK ▪ S
Data Loading...
