Abstract
The influence of the porosity on the mechanical properties of a Nextel™610/Al2O3-ZrO2 composite was investigated. The goal of the study was to determine the minimum porosity required for damage-tolerant behavior. To generate different porosities, the standard material was reinfiltrated with zirconium-n-butoxide up to seven times, thereby decreasing the open bulk porosity and the submicron porosity. The fiber- and matrix-dominated mechanical properties were investigated by three-point-bending with long and short beam samples. With decreasing porosity, the bending strength and strain dropped. A reduction from 46% to 37% in submicron porosity caused a loss of the damage-tolerant behavior of the samples. The Young’s modulus increased with every infiltration. The interlaminar shear strength showed a similar behavior but reached a maximum at 34% submicron porosity. Afterwards, it decreased as well due to the fibers acting as flaws.
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