Sintering, microstructure, and mechanical properties of ZrO 2 -doped Al 2 O 3
Source abstract
Abstract
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.
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Research context
OpenAlex topics: Advanced ceramic materials synthesis · Advanced materials and composites · Ferroelectric and Piezoelectric Materials
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
Laboratory for New Ceramics, Department of Ceramic Engineering, National Institute of Technology Rourkela, Rourkela, India
Department of Materials Science and Engineering, Virginia Tech, Blacksburg, VA, USA
References (45)
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