铝硼硅酸盐玻璃纤维结构与耐水动力学

采用红外光谱、示差扫描量热分析等手段研究了氧化硼对铝硼硅酸盐玻璃结构及转变温度的影响,并用粉末法测试了玻璃的耐水性。结果发现,随着氧化硼含量增加,玻璃转变温度先降低后升高。玻璃与水反应初期受硼酸盐的水解动力学控制,后期主要为水分子对硅氧骨架的侵蚀和Ca2 与H 离子的离子交换过程。分析认为,引入少量的B2O3主要与碱性的CaO结合,生成含有非桥氧的端氧键B-O-Ca,破坏了玻璃网络结构,B2O3过量时,更多的硼酸盐基团与硅酸盐基团结合,生成桥氧键B-O-Si键,增强了玻璃结构。

Structure and Water Resistance of Alumino-borosilicate Glass Fiber

The effects of boron oxide on the structrure and tansition temperature of alumino-borosilicate glasses were investigated using IR and DSC techniques.The durability of glass in water was also tested.The results reveal that the evolution of glass transition temperature has non-linear depandence on the content of boron oxide.At the first stage of glass-water interaction,the mechanism is controlled by the hydrolysis of borate groups,then the water molecules attack the silicon oxygen framework and the hydrogen ions in water exchange with the network intersitial cation Ca2 ion.Concerning the relationship between the properties and the structures among the process,boron oxides may connect with basic CaO to form non-bridge oxgen bond B-O-Ca,which breaks the glass network;as boron oxides increase,more borate groups may connect with silicate groups to form bridge oxygen bond B-O-Si that strengthens the structure of glass.