摘要
以粉煤灰、高岭土混合物为原料,采用碳热还原氮化法制备了不同z值的β-Sialon粉体。研究了原料组成(Si/Al值)、活性炭配量以及反应温度对合成产物物相的影响。利用X射线衍射仪分析产物物相的组成,用扫描电子显微镜对产物的显微形貌进行分析。结果表明,当原料中Si/Al值为1.5,配炭量过量100%时,在1450℃保温6h条件下,可以合成主要物相为Si3Al3O3N5(β-Sialon,z=3)的粉体,粉体的显微形貌呈现纤维状;当原料中Si/Al值为1.7,配炭量过量150%时,在1450℃保温6 h条件下,可以制备主要物相为Si4Al2O2N6(β-Sialon,z=2)的粉体,粉体的显微形貌呈现纤维状和板状。
β-Sialon powder with different z values was synthesized using fly ash and kaolin as the starting materials by carbothermal reduction and nitridation. Phases and microstructure of the product were analyzed by X-ray diffractometer and scanning electron microscope. The results show that β-Sialon with z value of 3 （Si3Al3O3N5） was synthesized using the starting material with Si/Al ratio of 1.5 and 100% excessive carbon content at 1450 ℃ for 6 h, and the microstructure of the powder was fibrous. β-Sialon with z value of 2 （ Si4Al2O2N6 ） was obtained with Si/Al ratio of 1.7 and the 150% excessive carbon content at 1450 ℃ for 6 h, and the microstructure of this powder was fibrous and slabby.
出处
《人工晶体学报》
EI
CAS
CSCD
北大核心
2013年第4期701-705,711,共6页
Journal of Synthetic Crystals
基金
国家自然科学基金(51064006)
