Abstract：Ultrafine copper powders were prepared by chemical reduction under ultrasonic field, with triethanolamine complexes of copper as raw materials and aluminium powders as reducing agents. The phases, microstructure, inoxidizability and surface-coating feature of resultant copper powders were confirmed by XRD, SEM, FTIR and TG. The stability of the copper powders was measured based on the measurements of their resistance. The results indicate that the ultrafine copper powders obtained by using cetrimonium bromide as surfactant under ultrasonic field have better dispersibility and greater inoxidizability.

Keywords：ultrafine copper powder; triethanolamine complexes of copper; surfactant; inoxidizability