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1 Materials Science Poland

1 2008

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Nanometric Y2O3-TiO2-ZrO2 solid solution powders and their utilization in the synthesis of composite powders with TiB2 and TiC inclusions

Moskała N., Morgiel J., Pyda W.

Materials Science Poland

2008

Vol. 26, No. 2

331--339

Carbothermal reduction of TiO2 dissolved in ZrO2 and B2O3 is a method of fabrication of fine composite powders in the ZrO2-TiB2-TiC system. The method requires nanopowders of the zirconia -titania solid solution with a high TiO2 concentration. A technique of fabrication of zirconia nanopowders doped with 18 mol % titania and 2-3 mol % yttria is described in the paper. The nanopowders were obtained in a co-precipitation process followed by hydrothermal crystallization at 240 °C. The phase composition (XRD) and EDS measurements proved formation of a solid solution as the only phase. DTA and TG analyses showed that there are no amorphous phases. A nanometric morphology was proved by the TEM observations and the specific surface area measurements (BET). Dynamic light scattering was used to measure the agglomerate size distribution. A usefulness of the zirconia-titania-yttria nanopowders to the in-situ syntheses of composite powders in the ZrO2-TiB2-TiC system was described. The composite powders were fabricated in the reaction of titanium oxide dissolved in the TiO2-Y2O3-ZrO2 solid solution with boron oxide and carbon. A mixture of zirconia solid solution nanopowder containing 2-3 mol % of Y2O3, 18 mol % of TiO2 and 79-80 mol % of ZrO2, boric acid and 20 wt. % alcohol solution of phenolformaldehyde resin was used for the synthesis. The phase compositions of the composite powders were characterized by X-ray diffractometry.