Herstellung von oxidkeramischen Verbundwerkstoffen mittels Freeze-Casting (Volume 10) (English shop)

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In this work, a novel freeze-casting process was developed for the production of oxide ceramic composites. The main focus is on the transformation of a liquid, low-viscosity slurry into a solid matrix that does not shrink during sintering. This is necessary because the oxide fibres used counteract sintering shrinkage and the porosity must therefore be maintained. The matrix, consisting of YAG and ZrO2, is an essential component of the composite, as it mechanically decouples the Al2O3 fibre filaments, transfers the forces between them and ultimately enables the damage-tolerant fracture behaviour. The result is a high-strength material that can be used permanently in corrosive atmospheres at temperatures of over 1000 °C. The composites with Nextel™610 fabric reinforcement (Al2O3 fibres) and YAG-ZrO2 matrix have a density of 2.9 g/cm³ with an apparent porosity of 31 vol.%. The flexural strength is approximately 300 MPa with a strain at fracture of 0.37 %.