An admixture of hydrated alumina and an organic acid surfactant is calcined in an oxygen-depleted atmosphere, cooled before exposing it to air, comminuted and then centrifuged to produce nanometer-grade superfine .alpha.-alumina powder.

Um admixture do alumina hydrated e de um surfactant do ácido orgânico calcined em uma atmosfera oxigênio-esgotada, é refrigerado antes de expo a ao ar, comminuted e centrifuged então para produzir o pó superfine do alpha.-alpha.-alumina da nanômetro-classe.

 
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