The process characteristics of ultradisperse powders of alumina and zirconia, prepared by plasma-chemical synthesis, are investigated. It is demonstrated that the powders in the initial state are characterized by extremely low values of bulk density, fluidity, and compactibility. The effect of preliminary treatment on the process properties of the powders has been studied. By means of preliminary hydrostatic compaction, followed by planetary mill grinding, it is possible to change the shape and size of the powder particles and raise substantially the bulk density and fluidity. Preliminary treatment of the powders also has a positive effect on their compactibility and sinterability; the density of pressings attains 60% and the density of sintered ceramics, 98 - 99% of the theoretical value.
ASJC Scopus subject areas
- Ceramics and Composites