THERMOMECHANICAL AND THERMOPHYSICAL PROPERTIES OF LIQUID SILICONIZED C C-SIC/

Mechanical properties (strength, stiffness and stress-strain behaviour ) and physical properties (thermal expansion and conductivity, heat ca pacity and emissivity) of C/C-SiC (manufactured at DLR Stuttgart by li quid siliconization process) have been investigated at temperatures up to 1600 degrees C. Sophisticated facilities have been developed and e stablished for the thermomechanical testing of flat and tubular C/C-Si C-specimens under tension, compression and torsion loading (static and dynamic) and also for combined multiaxial loading. A non-linear stres s-strain behaviour from the beginning of the load was observed. This n onlinearity is independent of the parameters specimen goemetry, size a nd temperature. The test results have been correlated with analytical approaches. Thermophysical properties of samples with different types of woven (Atlas, Leinwand, Koper) fibres (Toray T300, Toray M40) and v arying volume content of fibres were measured and the results have bee n used to apply theoretical models available from the literature to ca lculate the properties of the material components.