球磨对ZrO_2（Y_2O_3）超细粉末性能的影响

Effect of Ball-Milling on the Properties of Ultrafine ZrO_2(Y_2O_3) Powders

以共沉淀法制备的煅烧态ＺｒＯ２（Ｙ２Ｏ３）超细粉末为研究对象，研究了球磨对其物理和烧结性能的影响。结果表明，球磨虽可以有效地减小粉末的团聚尺寸，但对粉末一次颗粒尺寸的影响不大，球磨可以显著增加团聚程度较严重的煅烧态粉末的比表面积，但对团聚程度较轻的粉末，其影响不大；球磨还可显著减小粉末的晶粒尺寸，这与粉末在球磨过程中发生了相变有关。此外，对团聚较严重的粉末，球磨可改善其烧结性能，但对团聚程度较轻的粉末，球磨的作用不明显。

he effect of ball-milling on the properties of ultrafine ZrO2 (Y2O3) powders prepared by coprecipitation under different conditions is investigated. It is shown by the expertimental results that the agglomerate size of as-calcinated powders can be effectively decreased by ball-milling but the primary particle size is hardly affected. The surface area of seriously agglomerated powders can be markedly increased by ball-milling but that of softly agglomerated powders is not evidently increased. The crystal size of as-calcinated powders becomes much finer after ball-milling because transformation of the powder from tetragonal structure to monoclinic structure occurs during ball-milling. It is also shown that ball-milling can be used to improve the sinterability of seriously agglomerated powders.