酸度系数对复合改性矿渣纤维结构特性的影响

Effect of Acidity Coefficient on Structural Properties ofComposite Modified Slag Fiber

关键词:  复合改性矿渣纤维  酸度系数  抗拉强度  微观结构

Key words:  composite modified slag fiber  acidity coefficient(AC)  tensile strength  microstructure

摘要:

设计了6种酸度系数为093~160的矿渣，在成纤工艺基本相同的条件下制备出复合改性矿渣纤维.研究了化学组成变化对纤维几何参数、单丝抗拉强度以及玻璃体结构的影响规律，分别得到酸度系数与纤维长度、直径、长径比、玻璃体部分结晶温度以及固态魔角自旋核磁共振谱中29Si和27Al的主峰化学位移之间的拟合关系式.结果表明：随着酸度系数的增加，纤维长度及直径逐渐增加，而长径比在酸度系数低于119时先增加后降低，纤维单丝抗拉强度呈线性增加，纤维玻璃体部分结晶温度提高.Si和Al在复合改性矿渣纤维中均以四面体形式存在，且提高酸度系数将显著提高玻璃体网络结构的聚合度，增加纤维稳定性.

Abstract:

Six kinds of slag with acidity coefficient(AC) from 093 to 160 were fabricated under similar fibration process. Geometry parameters and single filament tensile strength as well as amorphous structure were measured and estimated for the fibers with various chemical compositions. A series of fitted empirical equation to AC were established to correlate AC to length, diameter, the aspect ratio of fiber, partial crystalline temperature, and main peak chemical shift of 29Si and 27Al spectra from solid state magic angle spinning nuclear magnetic resonance (MAS NMR) spectroscopy. The results show that the length and diameter of the fiber increase with increasing AC and the aspect ratio increases when AC is below 119 and then declines slightly afterwards. There is a clear linearly progressive correlation between single filament tensile strengths and AC. In addition, the crystalline temperature of the fiber rises with increasing AC. Silicon and aluminum atoms exhibit four coordination in network of amorphous phase and greater AC can result in higher polymerization forming more stable fiber structure.