Gelcasting and sintering behaviour of an alumina-zirconia-yttria nanopowder

An alumina-zirconia-yttria nanopowder was synthesized by sol-gel method. The calcined nanopowder was characterized by X-ray diffraction and scanning electron microscopy. Sodium alginate―a natural innoxious polymer―was applied for in situ forming process of an Al2O3-ZrO2 (Y2O3) green body by using calcium phosphate as a solidified agent. Sodium hexametaphosphate was also used as a chelator. Rheological and gelation behaviour of resultant slurry were analyzed. The green body was densified to near its theoretical density by pressureless sintering at 1500 °C for 3h. In addition, uniform and nano-size microstructure was revealed by SEM micrographs

کلیدواژه ها:

Nanopowder ، Sol-gel ، Gelcasting ، Sodium alginate ، Pressureless sintering