Study on the glass formation and chemical stability of glass with dysprosium oxide highly doped in BSA system

In order to research the glass-forming ability and the resistance to corrosion in the different chemical solutions of B₂O₃- SiO₂-A1₂O₃ glass highly doped with dysprosium oxide, and to study the mechanism and the regular of corrosion, the glass forming areas were gained through the expanding-selection-dot method and the glass chemical stability were investigated by the UV3101-PC spectrophotometry, differential thermal analysis (DTA) and grain test method. The factors, such as different H⁺ concentration, different field strength of the rare earth ions, and the overlay on the surface., effected on the corrosion degree, were compared and analyzed. The results show that BSA glass has a good glass forming ability, the corrosion process was mainly controlled by the diffusion of the rare earth ion's hydrate and the interaction with H⁺, so that the acid resistance ability was the worst and the alkali resistance was the best. Furthermore, the stronger of the rare earth ion field strength, the better of the glass corrosion resistance ability, and the more stable of the chemical stability of the glass. With the time going on, the glass dissolution rate was decreased because of the surface overlay coming forth.