论文部分内容阅读
在6Bi2O3·Si O2熔体冷却过程中熔体表面会析出枝晶,其形貌呈现出高度有序的畴结构特征。原位实时观察了枝晶的生长发育过程,并分析总结了枝晶的结构、形貌特征及其在冷却过程中的生长规律。当6Bi2O3·Si O2熔体降温到1070℃时,熔体中部分区域会析出结晶性能较好的六方双锥形Si O2单晶颗粒,尺寸范围5~80μm。分析了6Bi2O3·Si O2熔体析晶机理。6Bi2O3·Si O2熔体冷却后进行线扫描,得出在所扫描区域上会出现偏析现象。采用红外光谱分析了不同温度下极冷熔体样品的微观结构,从而探讨了6Bi2O3·Si O2熔体分相的机理。熔体出现各向异性结构的原因可能由于熔体中的[Bi2O2]基元层、[Bi O6]基团和[Si O4]基团共同作用造成的。
Dendrites are precipitated on the melt surface during the cooling of 6Bi2O3 · Si O2 melt, and the morphology of the dendrite is highly ordered. The growth and development of dendrite were observed in situ in situ. The structure, morphology and growth of dendrite were also analyzed. When the temperature of the 6Bi2O3 · Si O2 melt is cooled down to 1070 ℃, hexagonal biconical Si O2 single crystal particles with good crystallizability will be precipitated in some regions of the melt, with the size range of 5 ~ 80μm. The crystallization mechanism of 6Bi2O3 · Si O2 melt was analyzed. 6Bi2O3 · Si O2 melt cooled line scan, resulting in segregation of the region will appear on the scan. The microstructure of very cold melt samples at different temperatures was analyzed by infrared spectroscopy, and the mechanism of the phase separation of 6Bi2O3 · Si O2 melt was discussed. The reason for the anisotropic structure of the melt may be due to the combination of the [Bi2O2] elementary layer, the [BiO6] group and the [SiO4] group in the melt.