Session: 02-02 Design and Application of CMC Materials and Components

Paper Number: 128503

128503 - Potential of Pressure Slip Casted All-Oxide CMC Elements for Use in Gas Turbine Systems 

The development of new high-temperature turbine materials is necessary to enable the combustion of H2 in modern gas turbines, as well as to increase plant efficiency and reduce exhaust gas emissions. Therefore, oxide ceramics offer high oxidation stability and temperature resistance to withstand the conditions of modern turbines hot gas sections. Compared to metallic components they enable reduced cooling and extended operating times. However, in order to make these materials suitable for turbine applications, it is necessary to reinforce the ceramics with complex continuous fiber reinforcements, thereby significantly increasing the damage tolerance of the composite. The reinforcement architecture applied poses a major challenge for the production of the CMC using colloidal manufacturing routes. Therefore, a novel 3D-braided reinforcement architecture was developed within the public research project 3DOxOxTurbine (funding ID: 03EE5074C) to enable the near-net-shape production of CMC elements by pressure slip casting technology. While conventional fibre-reinforced ceramics have so far been manufactured to the size of a single piece in factory-like processes, the research project is combining pressure slip casting with 3D braiding.

To evaluate the potential impact of the pressure slip casted ceramic composites on modern gas turbine systems, a thermomechanical model using the NASA Multiscale Analysis Tool (NASMAT) was developed to calculate the materials performance when applied to elements of the gas turbine’s hot gas section. The model enables the prediction of equivalent properties of the composite structure and performs progressive damage modeling.

Within this paper, the manufacturing process for pressure slip casting of continuous fiber-reinforced all-oxide ceramics (Al₂O_3(f)/Al₂O₃-ZrO₂-RBAO) as well as the determination of equivalent material characteristics will be described. The composite properties transferred by multi-scale model are applied to the gas turbine process for selected hot gas elements, such as stationary turbine blades. The impacts on the performance parameters of the system are evaluated. Finally, this aims to improve the service life of the components.

Presenting Author: Fabian Jung Institut für Textiltechnik of RWTH Aachen University

Presenting Author Biography: Mr Fabian Jung, M. Sc., is employed as a research associate at the Institut für Textiltechnik of RWTH Aachen University as part of his doctorate in engineering. Due to his extensive know-how in the field of processing technical textiles and the application of liquid impregnation processes, his work focuses on the development of colloidal manufacturing routes for the production of CMC. He actively leads the development of technical ceramics for energy and medical applications in public research projects.

Authors:

Fabian Jung Institut für Textiltechnik of RWTH Aachen University
Johannes Götte B&B AGEMA Gesellschaft für energietechnische Maschinen und Anlagen Aachen GmbH, Aachen, Germany
Yiou Liu B&B AGEMA Gesellschaft für energietechnische Maschinen und Anlagen Aachen GmbH, Aachen, Germany
Timo Markus Institut für Textiltechnik of RWTH Aachen University
Thomas Gries Institut für Textiltechnik of RWTH Aachen University