Study On The Component, Structure And Properties Of Borosilicate Glass

Borosilicate glass has been a wide range of applications and development due to its excellent performance. Borosilicate glass has been used from the instrument glass to the building fire-resistant glass, from the containers cookware glass to the display glass, from the chemical industry to the field of optoelectronic. In recent years, as the development of glass melting technology and forming technology, the borosilicate glass will be obtained greater use and development that other glass can not match. Today, many scientists have greatly focused on borosilicate glass. With the constant promotion of the requirements and quality of the glass, the borosilicate glass will play a more important role in the glass industry.There is some problem in melting and molding of borosilicate glass, such as high melting temperature, larger viscosity, easy phase separation and crystallization, boron volatilization, etc, which make it difficult to meet the float mass production. This paper expects to systematically adjust the component of borosilicate glass to study the structure and properties of the glass, which is satisfied with float technics, not easy to be of phase separation and crystallization, and with excellent thermal properties, chemical and mechanical properties.This paper discussed the influence of different factors on the boron volatilization from the holding time、the different temperature segment、pretreatment aspects; at the same time, measured the content of boron in the upper and lower layers of the glass, analysed it from the structure. With the holding time added, the evaporation rate of boron gradually increased, the boron volatilization at4h flatten; the size of pressure also had a certain impact on the boron volatilization, at30MPa the most appropriate; the impact of temperature on the boron volatilization was mainly manifested in the low-temperature segment (1000℃below), the boron volatilization was very little when there was glass liquid; batch dry-pressed can effectively reduce the boron volatilization from13.34%to8.36%; the boron volatilized from the surface layer of the glass, the content of boron in the upper and lower glass varied widely, the structure of the upper and lower glass had great difference which was dad to the actual production.When SiO2was substituted by B2O3, with the increasing of B2O3/SiO2, the content of [SiO4] in the glass gradually reduced, the content of [BO3] gradually increased,[BO4] first increased and then remained unchanged. The thermal expansion coefficient first reduced and then increased. The transition temperature and softening temperature decreased. The high-temperature viscosity gradually reduced. The glass material was shorter, the flexural strength and chemical stability of glass had contact with the glass network, first became stronger and then weakened.When SiO2was substituted by Al2O3, with the increasing of Al2O3/SiO2, The thermal expansion coefficient gradually increased. The transition temperature and softening temperature had no obvious increment and decrement. The high-temperature viscosity gradually increased. The flexural strength and chemical stability of glass gradually decreased.When Na2O was substituted by K2O, with the increasing of K2O/Na2O, The thermal expansion coefficient gradually increased. The transition temperature and softening temperature increased. The high-temperature viscosity gradually increased. The chemical stability of glass became stronger, the flexural strength first became stronger and then weakened.When SiO2was substituted by CaO, with the increasing of CaO/SiO2, The thermal expansion coefficient gradually increased. The transition temperature and softening temperature also increased. The high-temperature viscosity gradually decreased. With the increasing of CaO, the crystallization tendency became more and more obvious.