Sinter forging of zirconia toughened alumina

Two-Stage Sintering of Alumina-Y-TZP (Al₂O₃/Y-TZP) Composites

“…The main underlying theory that may be attributed to the success of alumina-zirconia composites in the biomedical field is that these composites shows good mechanical properties of alumina especially hardness and at the same time is able to exhibit enhanced toughness due to the stress induced transformation toughening of zirconia's tetragonal (t) grains to monoclinic (m) grains without compromising on ageing resistivity under steam or body fluid conditions. However, careful tailoring of the sintering route needs to be taken as many researchers have also reported that the incorporation of Y-TZP into the alumina matrix might improve fracture toughness (KIC) but may cause undesirable effects on the Vickers hardness (HV) and Young's modulus (E) [11][12][13][14]. These effects were caused by high porosity in the microstructure composites due to lower amount of the tetragonal grains present in the composite structure and also different thermal expansion coefficient of the alumina and zirconia matrix [13][14][15].…”

Properties of the translucent ceramics Nd: Y2O3 prepared by pulsed compaction and sintering of weakly aggregated nanopowders

“…There exist three approaches that ensure the effective removal of pores from the initial material. The first approach is based on the use of hot pressing methods [10,11], in which pores with different sizes and morphologies are collapsed under the combined action of high pressures and temperatures. Powders of different degrees of aggregation are suitable for these technologies.…”

Low-field magnetoresistance of La0.7Sr0.3MnO3 nanoceramics processed by different precursor approaches and powder compaction techniques

“…Thus, the preferred routes of nanostructural ceramics preparation are high-energy methods of compaction, since the application of these methods significantly decreases the temperature and duration of sintering. 9,10 The method of pulsed magnetic compaction (PMC) makes it possible not only to reach a high relative density of samples (0.7-0.8) using nanopowders but also to mechanically activate particles by producing a variety of point and extended defects.…”