Microhardness of Different-Oxides Nanoceramics
The method of the Spark Plasma Sintering (SPS) was used for formation of the fine-grained ceramics from different nanodimensional alumina powders and powders of other oxides. A comparison of the microhardness of ceramics from various alumina nanopowders was held. The microhardness of ceramics created by SPS method and the conventional way (pressing, then sintering) is compared. The dependence of ceramics microhardness on the average size of its particles was investigated. Besides alumina nanopowders, there were compared microhardness of ceramics from nanopowders of oxides of zinc, copper, titanium, zirconium, tungsten, magnesium, chromium, cobalt, niobium, silicon, iron, yttrium and gadolinium created by SPS and the conventional way. It was determined that for ceramics
created by SPS method, the microhardness is considerably larger than the microhardness of ceramics created by the conventional way; at the SPS method the average size of ceramics grains diminishes (to less than 1 micron).