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In the present work, the effect of Zr-doping on the sintering, microstructure development, and mechanical properties of polycrystalline Al 2 O 3  was studied. Dopant concentrations of 830 and 2070ppm cationic ratio of Zr in Al 2 O 3  corresponding to 2000 and 5000 wt. ppm of ZrO 2  in Al 2 O 3 , respectively, were used. The sintering schedule of undoped as well as Zr-doped Al 2 O 3  samples was optimised following a series of precoarsening experiments. The Zr-doped Al 2 O 3  ceramics exhibited controlled grain size and improved density. Upon increasing the Zr-dopant concentration from 830 cat. ppm to 2070 cat. ppm. Zr-doped Al 2 O 3  ceramics having a refined microstructure with a homogeneous distribution of controllably grown ZrO 2  in Al 2 O 3  matrix was obtained. Microhardness of the Zr-doped samples showed negligible dependence with Zr-doping, whereas mechanical strength was found to improve with it. The improvement in strength was attributed to the combined effect of improved sinter density, microstructural refinement, and grain-boundary strengthening.

Sintering, microstructure, and mechanical properties of ZrO 2 -doped Al 2 O 3