Preparation of Y_2O_3/ZrO_2 Ultrafine Powder by Co-precipitation Method

Ultrafine Y_2O_3/ZrO_2 powder is prepared with ZrOCl_2·8H_2O, Y(NO_3)_3·6H_2O,ammonia as starting materials by co-precipitation method. The effects of ZrO_2 crystal seeds, reaction temperature, reactant concentration, pH values, content of active agent (DBS), aging temperature and annealing temperature on the preparation of Y_2O_3/ZrO_2 ultrafine powder are studied. The results show that Y_2O_3/ZrO_2 ultrafine powder with apparent crystallite size about 15 nm and second particle diameter of 100 nm can be prepared, the inceptive formation temperature of the Y_2O_3/ZrO_2 powder is at about 400 ℃.