Carbon fiber-reinforced, SiC-based composite materials (Cf/SiC-composites) are possessing high fracture toughness and wear resistance combined with low densities. The high damage tolerance and operation temperatures above 1000 °C facilitate these materials a wide range of applications such as brake discs, bearings or gas turbines.
For a sustainable, resource-saving production of fiber-reinforced composites an efficient process based on the “polymer-infiltration and pyrolysis”-method (PIP) is established which enables a significant decreased processing time compared to the classical PIP-process.
Optimized matrix materials
The optimized use of passive and active filler materials compensates shrinkage and formation of pores during thermal conversion of the SiC-forming polymers. Thus, quantity of polymer-infiltration and pyrolysis (PIP) cycles are significantly decreased while obtaining a dense composite material. As an additional benefit the amount of cost-intense SiC-forming polymers can be reduced.
Selection of suitable passive and active filler materials and subsequent modification by mechanical processing methods lead to significant improvements of key properties such as thermal conductivity. Depending on the type of fibers (chopped fibers, long fibers, prepregs) forming processes are modified yielding in an optimized matrix development and increasing the field of application further.
Modification and pre-preparation of carbon fibers by purpose (conditioning) enable the homogeneous distribution and specifically adjusted attachment of fibers and matrix. Beneficially, this leads to an optimal processing during shaping and conversion of the precursors.
- Development of application-specified matrix materials
- Development of fiber- and matrix-specified processing
- Analysis and optimization along the whole process chain