酸沥滤和热处理对SiO_(2)-Na_(2)O系统高硅氧玻璃纤维结构的影响

Effects of Acid Leaching and Heat Treatment on Structure of SiO_(2)-Na_(2)O Glass Fibers

高硅氧玻璃纤维应用广泛、性能优异。目前制备高硅氧特种玻璃纤维的主要方法是酸沥滤。酸沥滤法是将玻璃纤维原纱通过酸沥滤,热处理等工艺制备得到高硅氧玻璃纤维。采用Raman光谱研究SiO_(2)-Na_(2)O二元系玻纤在酸沥滤、热处理工艺制备高硅氧玻璃纤维过程中的纤维结构变化。结果表明:酸沥滤过程使硅氧四面体的弯曲振动峰和不对称伸缩振动峰向低波数偏移,且峰强变弱,主要由于酸沥滤过程提高了纤维的SiO_(2)含量并改变了内部结构。热处理后,纤维Raman光谱的不对称伸缩振动峰消失,出现缺陷谱线D^(1)和D_(2),且不同热处理温度后纤维的致密度不同,主要是由于热处理过程中纤维发生的缩合反应导致的。

High silica glass fiber is widely used and has the superior properties.Acid leaching is the main existing method to prepare high silica special glass fiber.In this paper,high silica glass fiber was prepared via acid leaching and heat treatment.The structure of SiO_(2)-Na_(2)O binary glass fiber during acid leaching and heat treatment was investigated by Raman spectroscopy.The results show that the bending vibration peak and asymmetric stretching vibration peak shift to a lower wavenumber,and the peak intensity becomes weaker during acid leaching process,mainly because SiO_(2)content in the fiber increases and the internal structure of the fiber changes to a chain structure.After heat treatment,the asymmetric stretching vibration peaks disappear,and the defect lines D_(1) and D_(2) appear,and the density of fibers changes at different heat treatment temperatures,mainly due to the condensation reaction of fiber during heat treatment.