- Restrictions on Access:
- Open Access.
- The calcium aluminosilicate glass (CAS) system is a useful ternary system to evaluate the corrosion response of alkaline earth aluminosilicate glass surfaces. The chemical durability of this glass system has not been well studied, but is relevant to both fundamental glass science and industrial glass manufacturing where alkali-free aluminosilicate glasses are exposed to corrosive conditions during processing for electronics and optics. The objective of this work is to relate the bulk composition to surface response for various compositions in the calcium aluminosilicate system. These studies emphasized the characterization of CAS glass surfaces before and after corrosion in combination with existing solution chemistry experiments. Corrosion effects such as altered layer formation and hydration were studied for a range of CAS glass compositions. Surface characterization techniques such as x-ray photoelectron spectroscopy (XPS), infrared vibrational spectroscopy (FTIRRS, ATR-IR), and secondary ion-mass spectrometry (D-SIMS) were used to characterize the glass surfaces. The surface response of CAS glass surfaces was found to depend on composition, solution pH, and reaction time. For relatively high-silica CAS glasses (>70% SiO2), incongruent dissolution was not found to be an in-depth effect of corrosion even in strong acid conditions as observed for other glass systems such as the sodium aluminosilicate glass system. Analysis of the reacted glass surfaces indicated the attack of Al-O bonds and release of calcium as the primary mode of degradation in acidic solution. The reactivity of the glass surfaces was found to trend with the relative amount of alumina in the bulk composition.
- Dissertation Note:
- M.S. Pennsylvania State University 2016.
- Technical Details:
- The full text of the dissertation is available as an Adobe Acrobat .pdf file ; Adobe Acrobat Reader required to view the file.
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