Fabriction of various nanocomposites starting from hydrothermal powder mixtures

摘要

Powders in two alumina matrix nanocomposites systems were prepared by hydrothermal processing, Al_2O_3/ZrO_2, in which powders were simulataneously produced in one hydrothermal step, and Al_2O_3SiC where a fine SiC powder was mixed with the alumina precursor prior to hydrothermal Treatment. The effect of seeding was studied in the Al_2O_3/ZrO_2 system. The sintering behaviour and The microstructures of the densified nanocomposites depended on the nature of the second phase ZrO_2 Or SiC, the amount of seeding and on the sintering conditions.