Synthesis of bauxite based β-SiAION by compound reduction nitridation
The process of synthesizing bauxite based β-SiAlON by using carbon silicon composite reducing agent was studied.Specimens prepared by mixing bauxite (Al2O3 68%),carbon black and silicon are nitrided at 1100~ 1550C for 6h.The mass change ratio of the specimens are determined;Phase composition and microstructure of some specimens are examined by XRD,SEM and EDS.The results are compared with those of specimens using Si and C separately as reducing agent.It is found that at 1100~1200℃ only Si reacts with N2 and SiO2 to form Si2N2O; At 1300~1400℃,C takes part in reduction-nitridation with subsequent formation of SiAlON; At 1450~1550℃,there is noticeable increase in β-SiAlON formation,the optimum temperature is 1500℃.The amount of β-SiAlON formed is higher and crystale growth is better than that of single reducing agent.
Bauxite B-Sialon Composite Reducing Agent Reduction-Nitridation Reaction
Yanqin Guo Hongxia Li
Huanghe Science and Technology College Institute of Technology,Henan Province,China
国际会议
广州
英文
1026-1029
2012-11-16（万方平台首次上网日期，不代表论文的发表时间）