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

Abstract

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.

Keywords

metal-oxide / nanosized powder / atomizing-combustion

References

[1] LinGuangming, TangZhenfang, LiuWenhao, et al.. Formation and measurement of Sn and its oxide ultrafine particles. Materials Science & Engineering, 1995, 13(3): 52-54(in Chinese)

[2] LuFan, ChenSongying. Preparation of ultrafine SnO₂ by supercritical fluid drying technology. Chinese Journal of Applied Chemistry, 1994, 11(5): 68-79(in Chinese)

[3] DuanXuechen, TuShiqiao. Preparation and structural characterization of ultrafine Bi₂O₃ powder. J CENT SOUTH VNIV TECHNOL, 1997, 28(2): 164-166(in Chinese)

[4] Yin Zhimin, Chen Shizhu, Pan Qinglin, et al. Preparation method of ultrafine Bi₂O₃ powder. China Patent, ZL92107155. 8. 1992-09-28

[5] ChenShizhu, YinZhimin. Fluid kinetics principle and design essentials of atomizer. Nonferrous Met Soc China, 1996, 6(3): 108-112

[6] ChenShizhu, YinZhimin. Effect of vortical nozzle on leakage pipe extension. Materials Science & Technology, 1998, 6(1): 69-72(in Chinese)

[7] ZhouLixingCombustion theory & chemistry fluid mechanics, 1986, Beijing, Science Press: 56-78(in Chinese)

[8] HanZhaocangCombustible materials & combustion, 1994, Beijing, Metallurgical Industry Press: 108-120(in Chinese)