Abstract
In the current work, ceramic‐matrix composites based on coarse‐grained alumina with additions of magnesia‐partially stabilized zirconia and/or fine‐grained TRIP steel have been prepared via pressure slip casting. The slip development is described in detail, covering additive selection and recipe formulation. Rheological properties and filtration behavior were investigated in a falling sphere viscometer and in a compression permeability filtration (CPF) cell, respectively. The results from laboratory scale were successfully transferred to a commercial pressure slip casting device. The casted samples were pressureless‐sintered at 1450°C in an inert gas atmosphere. The distribution of the steel within the matrix was studied using X‐ray tomography. Additionally, the formation of an interface between alumina and steel was evaluated by EBSD analysis. The reinforcing phases changed the mechanical and thermal properties of the material and therefore had a positive effect on the thermal shock performance. In particular, the presence of both, zirconia and 16‐7‐3 steel particles, resulted in a higher R parameter. The main responsible mechanism for this improvement was found to be crack deflection.
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