AbstractsPhysics

Translucent TZP ceramics prepared by sintering freeze-granulated nanopowders

by Wei Wei




Institution: Stockholm University
Department:
Year: 2012
Keywords: freeze granulated; Natural Sciences; Naturvetenskap; Physics, Chemistry, Mathematics; fysik/kemi/matematik
Record ID: 1362670
Full text PDF: http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-87766


Abstract

In order to obtain translucent tetragonal zirconia polycrystalline (TZP) ceramics, complete densification, and homogeneous microstructure free of agglomerates and residual pores are required. To achieve this goal, freeze granulation of the zirconia nanopowder was performed. A series of stable and homogeneous zirconia suspension without agglomerates was prepared, by varying the solids loading volume percentage, to study the influence of the suspension characteristics on the freeze granulation behaviors. The characteristics of the prepared powder granules in terms of their size, flowability, and packing behaviors were subsequently analyzed. Uni-axial dry-pressing of the optimal granulate was used to prepare ceramic green bodies, which demonstrated the level of high strength and rigidness suitable for green milling based on the principle of computer aided design (CAD) and computer aided machining (CAM). Green bodies were sintered in air under conventional pressure-less condition. The sample sintered at 1400oC demonstrated a high optical translucency.