Currently funded project

Round needled C/SiC tubular structures for space travel (RuRoRa)


Sub-projects of the participating partners
Sub-projects of the participating partners

Tubular structures made of ceramic matrix composites (CMCs) are used in the aerospace industry in particular because of their high torsional stiffness and temperature resistance combined with low weight. The fibre pre-bodies of the structures are currently mostly produced by winding or braiding processes. However, this method has disadvantages with regard to the mechanical properties in the form of delamination, low torsional stiffness or low tensile strength. Furthermore, high costs limit the use of CMCs.




Round needled tubular structures
© BWF Tec GmbH & Co. KG
Round needled tubular structures

Round needling of textile semi-finished products is to be used to produce tubular structures with increased fibre content in the Z-direction. Thereby improved properties in form of an increased interlaminar shear strength shall be achieved. Shorter production times in comparison to winding or braiding techniques will also enable a reduction in manufacturing costs. The infiltration, carbonisation and siliconisation processes are carried out by the project partner ECM. The Institute for Materials Science (IFM) in Münchberg is responsible for the development of the needling technology and the construction of the structures, while Tenowo GmbH is responsible for the nonwoven production process to realise a functionalised mixed-fibre nonwoven. At the Fraunhofer Centre HTL, the nonwoven structure for optimum infiltration behaviour is defined.


Rundvernadelte Rohrstruktur
© BWF Tec GmbH & Co. KG
Rundvernadelte Rohrstruktur
  • Very low thermal expansion due to specific fibre arrangement in the preform
  • Connection to existing CMC components according to requirements through adapted geometries and material performance 
  • Near-net-shape production of the preform by using round needling
  • Optimised component properties through development of the manufacturing process

Project Data

Project Duration 01.04.2020 - 31.12.2022
AiF - German Federation of Industrial Research Associations
Funding Amount 285,000 Euro

Project Partners




Fraunhofer-Centre HTL

ECM - Engineered Ceramic Materials GmbH

IFM - Institute for Material Sciences at Hof University of Applied Sciences

Tenowo GmbH

Project Coordination ECM - Engineered Ceramic Materials GmbH
Project Management at the HTL Felix Meier