Abstract
Zirconia is one of the major components of modern ceramic materials. Those last two decades, a very large number of studies were devoted to zirconia based ceramics. Two classes of materials can be distinguished: Zirconia Toughened Ceramics (ZTC) and zirconia based alloys in the form of Partially Stabilized Zirconia (PSZ) or Tetragonal Zirconia Polycrystals (TZP). In the field of ZTC, zirconia toughened alumina (ZTA) is certainly the most important material. Magnesium aluminum spinel (MgAl{sub 2}O{sub 4}) has similar elastic properties as alumina and therefore can as well be toughened by zirconia adding. Among very few previous papers reporting on zirconia-spinel composites, N. Claussen and col. have published results on mechanical properties of such materials. Those products could yet exhibit specific microstructural and mechanical behavior, because of the magnesium readiness to form solid solutions as well with zirconia as with alumina. Until now very few studies have been devoted to microscopic analysis of such materials. The aim of this work is to investigate by transmission electron microscopy the presence of orthorhombic zirconia grains in spinel zirconia composites.
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