DLR-BT in Stuttgart has a hot-air autoclave facility for producing complex, near-net-shape C/C preforms (carbon fibre-reinforced carbon). The C-containing preforms are converted into ceramic matrix composites (CMC) in subsequent process steps.
Mainly, prepreg technology is used. The high pressure inside is used to compress the individual laminate layers with the help of a vacuum film bag in which the preform is located. A defined pressure, vacuum and temperature profile is applied to cure the fibre composite.