Mechanism Analysis of Synthesizing Fe-Si3N4 by Flash-combusting FeSi75
It is necessary to know the synthesis mechanism of Fe-Si3N4 by flash-combusting FeSi75 in order to control the phase composition and microstructure of Fe-Si3N4 composites.In this paper,Fe-Si3N4 and starting material FeSi75 were analyzed with XRD,SEM and EDS.The results show that Fe-Si3N4 synthesized by flash-combusting FeSi75 (≤0.074 mm) is composed of β-Si3N4,α-Si3N4,FexSi,and SiO2,in which β-Si3N4 and α-Si3N4 are from the nitridation of metal silicon and part of the silicon in ξ phase while FexSi is from the nitridation of ξ phase; during the nitridation of ξ phase,Si content declines gradually,when Fe∶ Si is close to 3,the nitriding reaction tends to balance; the loose accumulation of nitriding products results in the slow heat release,which makes α-Si3N4 transform to β-Si3N4 and β-Si3N4 grow further to form rod-like β-Si3N4 crystals of high slenderness ratios; the rapid quenching ofnitriding products helps to keep the proportion between α-Si3N4 and β-Si3N4 small particles,and to reduce the crystallization of rod-like β-Si3N4; The grain size and distribution of FexSi in Fe-Si3N4 are related to the particle size and distribution ofξ phase in the starting material.
Fe-Si3N4 Flashing Combustion process β-Si3N4
Junhong Chen Bin Li Lingyan Yu Wen Song
School of Materials Science and Technology, USTB, Beijing 100083, China Sinosteel Luoyang Institute of Refractories Research Co., Ltd., Luoyang 471039, China
国际会议
The Sixth China International Conference on High-Performance Ceramics(第六届中国先进陶瓷国际研讨会(CICC-6))
哈尔滨
英文
59-62
2009-08-16（万方平台首次上网日期，不代表论文的发表时间）