[en] In the present paper the authors investigated the impact of small amount additives SiO₂, SnO₂ and TiO₂ on the initial sintering stage of tetragonal zirconia nanopowders (3Y-TZP). It has been shown that different additives have significantly influenced on phase composition, crystallite size and agglomeration degree of zirconia nanopowders which were manufactured by co-precipitation method. The sintering behavior of 3Y-TZP with and without a small amount 2 wt. % of SiO₂, SnO₂ and TiO₂ additives was investigated using the dilatometric data and analytical method for determining the sintering mechanism. The shrinkage behavior of all nanopowders was measured under the constant rate of heating technique (CRH). It was found that the sintering mechanism changed from volume (VD) to grain boundary diffusion (GBD) by addition 2 wt. % SiO₂, SnO₂ and TiO₂. (author)