کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1478287 | 991214 | 2005 | 6 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Effect of diluents and NH4F additive on the combustion synthesis of Yb α-SiAlON Effect of diluents and NH4F additive on the combustion synthesis of Yb α-SiAlON](/preview/png/1478287.png)
In this paper, Yb α-SiAlON crystalline powders with elongated grains were prepared by combustion synthesis. The effects of diluents and NH4F additive on the phase composition and microstructure of combustion products were discussed in detail. It is found that proper diluents are helpful to weaken the agglomeration, improve the infiltration of N2, and hence facilitate the nitridation reaction. Single-phase α-SiAlON with elongated grains could be fabricated with advisable addition of diluents. Furthermore, adding proper amounts of NH4F additive was also beneficial to the nitridation of Si and the development of elongated grains. However, excessive addition of α-Si3N4 diluents or NH4F additive will result in β-SiAlON in final phase composition.
Journal: Journal of the European Ceramic Society - Volume 25, Issue 14, September 2005, Pages 3361–3366