Preparation of Both Reactive α-Si3N4 and SiC Mixed Powder in Flame-Isolation Nitridation Shuttle Kiln

摘要：

　　α-Si3N4 possesses excellent sintering activity.Si3N4 powder is always synthesized by silicon nitridation,the intensive reaction heat is difficult to diffuse,which leads to high reaction temperature and conversion of α-Si3N4 to β-Si3N4,thus α-Si3N4 is difficult to be obtained.While flame-isolation nitridation shuttle kiln has much larger furnace volume to conduct reaction heat (effective volume:11500×4190× 1684mm),and it owns homogeneous temperature field and stable heat conduction which benefits the preparation of α-Si3N4.Thermodynamic analysis of Si-N system is shown that Si3N4 can be formed by two formats:direct nitridation of Si(s) and indirect nitridation of SiO(g); to ensure completely nitridation,the particle size of silicon powder should be less than 88μm.With polysilicon cutting waste as starting materials,both reactive α-Si3N4 and SiC mixed powder were successfully prepared in flame-isolation nitridation shuttle kiln.Because of the gas-gas reaction between SiO(g) and N2(g),α-Si3N4 is fiber-like and in favor of processing high quality Si3N4-based materials.

关键词： α-Si3N4 3-Si3N4 electric kiln flame-isolation nitridation shuttle kiln temperature field uniformity

作者: Xiaoyan Zhu Yong Li Jiaping Wang Yawei Zhai Jun Bo Jianfang Zhang

作者单位: University of Science and Technology Beijing,Beijing 100083,China China Nuclear Power Engineering CO.Ltd,Beijing 100840,China Sinosteel refractory Co.,Ltd,Luoyang 473019,China

会议类型: 国际会议

会议名称: The Seventh China International Conference on High-Performance Ceramics (第七届先进陶瓷国际研讨会(CICC-7))

会议地点: 厦门

会议语种:英文

页码: 17-23

在线出版日期: 2011-11-04（万方平台首次上网日期，不代表论文的发表时间）