YAN Yuhua, WANG Siqing

(Wuhan University of Technology)

Abstract: Used various of sources of SiO₂，Si₂N₂O was prepared by carbothermal reduction and nitridation of SiO₂．These soures of SiO₂ were: (A)natural quartz powder; (B)Na₂SiO₃;(C)natural quartz powder mixed Na₂CO₃ , and (D)ac­tivated SiO₂ . The following conclussions could be obtained by comparing the experiment results: (1) It is difficult to synthesize Si₂N₂O from Source (A) ; (2) Although the process in which Source (B) was used would be simplier and the purity of Si₂N₂O synthesized by using Source (C) would be higher, it was difficult to synthesize Si₂N₂O from Source (B) and (C) in industry, because the SiO₂ contents in Source (B) and (C) were too low; (3) Not only the purity of Si₂N₂O synthesized from activated SiO₂ would be higher, but also the synthesizing process was more valu­able in industrial application, although the proce达 was more difficult than both process in which Source (A) and (B) were used, respectively.

Keywords: Silicon Oxynitride, preparation, powder