Mixed oxides of alumina and zirconia consisting essentially of spherical particles having a narrow granulometric distribution and process for their preparation.

摘要

Mixed oxides of alumina and zirconia having a controlled granulometric distribution, consisting essentially of spherical, submicronic particles, wherein zirconia is distributed uniformly in alumina and may reach 38% by weight, said zirconia being in the stabilized form at room temperture in the tetragonal phase after having subjected the amorphous hydrated composite oxides to thermal treatments, wherein the transition occurs of zirconia to the tetragonal phase.