Bioinert implant ceramics .3. The powder-technological densification of nanoscaled ultra-fine powders of the Al2O3-SiO2-TiO2-system

The characterization and densification of different nanoscaled powder compositions out of the Al2O3-SiO2-TiO2-system is described, which have been produced by the hydrolysis- and/or sol-gel-method. Beside their chemical composition their morphology, specific surfaces and densities before and after pressure application as well as sintering are measured and the effect of drying and calcination is investigated separately. The results provide clearly that drying parameters do not have any relevant influence on densification that calcination at 1273 K/3 h leads to agglomerated powders free of humid constituents that the specific surfaces of the powders as well as their density decrease with increasing SiO2-content and increase with increasing Al2O(3)- and TiO2-content that agglomeration does not disadvantageously effect the densification, but that favorized concentration regions exist which provide high-dense, crack-free sintered pellets.