B2O3对低膨胀硼硅酸盐玻璃结构及性能影响的研究

以Na₂O-B₂O₃-SiO₂低膨胀玻璃为基础玻璃体系,用B₂O₃逐步取代SiO₂,采用高温熔融法制备出低膨胀硼硅酸盐玻璃。通过红外光谱、扫描电镜分析了玻璃微观结构,X射线光电子能谱分析了桥氧和非桥氧含量,研究了B₂O₃含量对硼硅酸盐玻璃机械性能、热膨胀性能和紫外-可见光透过率的影响。结果表明:B₂O₃含量的增加使玻璃结构中的BO₃]增多,玻璃分相逐渐加重;该体系玻璃的机械性能良好,显微硬度达802 kg/mm²,抗折强度达147 MPa;转变温度和软化温度都逐渐降低,热膨胀系数逐渐增加;玻璃样品的可见光透过率在90%左右,无明显规律,BO₃]增多,玻璃结构中非桥氧的含量增加,玻璃的紫外-可见光透过率逐渐降低。

Effect of B2O3 on Structure and Properties of Low Expansion Borosilicate Glass

The low expansion borosilicate glass was prepared by using Na₂O-B₂O₃-SiO₂ low expansion glass system and gradually replacing SiO₂ with B₂O₃ by high temperature melting method. The microstructure of borosilicate glass was analyzed by infrared spectrum and scanning electron microscopy. The content of bridged oxygen and non-bridged oxygen was analyzed by X-ray photoelectron spectroscopy. The effects of the content of B₂O₃ on the mechanical properties, thermal expansion properties and UV-Vis transmittance of borosilicate glass were studied. The results show that BO₃] in glass structure increases with the increase of B₂O₃ content, and the phase separation of glass becomes more and more serious. The glass system has good mechanical properties, with microhardness up to 802 kg/mm² and flexural strength up to 147 MPa. The transition temperature and softening temperature decreased gradually, and the thermal expansion coefficient increased gradually. The visible light transmittance of the glass sample is about 90% without an obvious rule. The increase of BO₃] increases the content of non-bridged oxygen in the glass structure, and the UV-vis transmittance of the glass decreases gradually.