PREPARATION OF NANOSIZED METAL-OXIDE ULTRAFINE POWDERS BY ATOMIZING-COMBUSTION TECHNIQUE

摘要

The nano-sized metal-oxide ultra-fine powders of the low-melting-point metals can be prepared rapidly using a new atomizing - combustion technique by which the superheated metal melt was atomized with a ceramic atomizing-burner first through the medium of high pressure oxygen, then the metal fog burned up in a combustion chamber. Based on the experiments, nano-sized SnO_2, In_2O_3 and Bi_2O_3 powders were obtained successfully by atomizing-combustion technique. The mechanism and process parameters of the technique were discussed. The phase structure and the microstructure of these metal-oxide ultra-fine powders were studied by XRD and TEM respectively. The biggest size of grain was less than 50 nm, and 1 kg metal-oxide ultra-fine powder can be prepared in only 45-50 seconds.