Completed funded project

CMC optimisation for turbine applications (CMC-TurbAn)


CMC Mixer
© NASA Technical Reports Server
CMC Mixer

Ceramic Matrix Composites (CMC) are to replace metallic materials in highly stressed parts of gas turbines. The use of CMCs is expected to increase turbine efficiency and reduce weight at the same time. In the future, CMCs can thus make an important contribution to reducing the environmental impact of air traffic. On the basis of developments in the field of oxidic CMC, demonstrators - so-called flower mixers - are being manufactured and tested for specific applications. In addition, the establishment of national testing capacities for CMCs is to be supported, also with a view to subsequent aviation certification of the materials.



Four-point bending test according to ASTM C1341
© Fraunhofer-Centre HTL
Four-point bending test according to ASTM C1341

Suspensions for oxide ceramic matrices are to be developed, which can be processed with 2D-fibre fabrics to Ox/Ox-CMC. For this purpose, the rheological properties, the particle sizes and the drying behaviour of the suspensions must be adjusted in such a way that the suspensions can be introduced homogeneously into the fabric without causing damage to the fabric. The HTL will carry out the material characterisation of the CMC and the validation of design elements according to international standards. This will ensure the comparability of the materials and components developed by the project partners during the project. The suitability of the materials for turbine applications will be ensured by material tests according to international aviation-relevant standards.



Microstructure images of O-CMC materials
© Fraunhofer-Centre HTL
Structural images of O-CMC materials with flaws (left) and without flaws (right)
  • Development of an O-CMC material according to the specifications of Rolls-Royce Deutschland Ltd & Co. KG
  • Determination of process stability (fiber type, matrix type, fiber volume content, sintering temperature) and its effect on mechanical properties
  • Process stability DoE with statistical design of experiments and statistical evaluation
  • Manufacturing of two feature samples / one bloom mixer study including mold making, ply-book development, fiber cutting and part finishing

Project Data

Project Duration 01.11.2018 - 30.11.2022
Sponsor Federal Ministry of Education and Research
Funding Amount 371,000 Euro
Project Partners Fraunhofer-Centre HTL
MTU Aero Engines AG
BJS Ceramics GmbH
Schunk GmbH & Co. KG
German Aerospace Centre
Rolls-Royce Motor Cars Ltd.
Project Coordination Fraunhofer-Centre HTL
Project Management at the HTL
Arne Rüdinger, Wolfgang Bernstein