《CMC MATERIALS AND BIOMORPHIC SiSiC》.pdfVIP

CMC MATERIALS AND BIOMORPHIC SiSiC FOR ENERGY APPLICATIONS B. Heidenreich, J. Schmidt, S. Denis, N. Lützenburger (1) J. Göring, P. Mechnich, M. Schmücker (2) (1) (2) DLR – German Aerospace Center DLR – German Aerospace Center Institute of Structures and Design Institute of Materials Research Pfaffenwaldring 38-40 Linder Höhe D-70569 Stuttgart, Germany 51147 Köln, Germany ABSTRACT Ceramic materials offer a high thermal and chemical stability and are therefore potential candidates for high temperature applications in severe environments, where metals can not longer be used. In future energy applications, high process temperatures 1200 °C are re- quired to increase the efficiency, to lower the fuel consumption, and to decrease the emis- sions. In order to achieve these goals, novel ceramic materials and manufacturing processes for complex structures are under development. 1. INTRODUCTION – CERAMIC MATERIALS FOR ENERGY APPLICATIONS At DLR, three different classes of ceramic materials have been developed for the use in energy applications: Oxide/oxide and non oxide Ceramic Matrix Composites (CMC) as well as monolithic SiSiC materials. The use of CMCs as liner material for gas turbines is a key concept to increase efficiency and reduce emissions. Replacement of metallic components by thermally stable ceramics allows reducing the amount of cooling air significantly. This will not only increase overall efficiency but allows lean combustion concepts. Moreover, ceramic components are re- quired for future turbine technologies based on hydrogen combustion. High temperature ceramic heat exchangers (HX) either