Journal of Materials Science

, Volume 41, Issue 15, pp 4795–4798 | Cite as

Formation mechanism of 21R AlN-polytypoids in aluminothermic reduction and nitridation process

  • Y. W. LiEmail author
  • G. H. Zhou
  • S. L. Jin
  • N. Li


Synthesis of 21R AlN polytypoids was investigated using Al and ultrafine SiO2 powder in a flowing nitrogen atmosphere by means of thermal gravity (TG), differential scanning calorimeter (DSC), X-ray diffractometer (XRD) and scanning electronic microscope (SEM) linked with energy dispersive spectrometer (EDS). The results showed that the formation mechanism of AlN polytypoids was different from that in reaction sintering process using Si3N4, AlN, Al2O3 and other sintering additive as raw materials. It was suggested that firstly Al reduce SiO2 into Si and is also nitrided into AlN, then AlN, Al2O3 and SiO2 dissolve into silicon liquid until the AlN polytypoids precipitate in saturated liquid in a flowing nitrogen atmosphere at lower than 1700 °C.


Energy Dispersive Spectrometer Sialon Silicon Liquid Nitridation Process Energy Dispersive Spectrometer Analysis 



This research work was financially supported by the Educational Department of Hubei Province, P. R. China.


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Copyright information

© Springer Science+Business Media, LLC 2006

Authors and Affiliations

  1. 1.Hubei Province Key Laboratory of Ceramics and RefractoriesWuhan University of Science and TechnologyWuhan China

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