Preparation of nanosized metal-oxide ultrafine powders by atomizing-combustion technique.

The nano-sized metal-oxide ultrafine 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 SnO₂, In₂O₃ and Bi₂O₃ 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 ultrafine powders were studied by XRD and TEM respectively. The biggest size of grain was less than 50 nm, and 1 kg metal-oxide ultrafine powder can be prepared in only 45–48 seconds. [ABSTRACT FROM AUTHOR]