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URN etd-0722104-142819 Statistics This thesis had been viewed 3127 times. Download 2040 times. Author Chih-chun Chiang Author's Email Address email@example.com Department Materials Engineering Year 2003 Semester 2 Degree Master Type of Document Master's Thesis Language zh-TW.Big5 Chinese Page Count 60 Title Chemical durability of a low melting, lead free SnO-ZnO-P2O5 glass Keyword Sealing Glasses Phosphate Glasses Chemical Durability Chemical Durability Phosphate Glasses Sealing Glasses Abstract This thesis is devoted to investigate the chemical durability of the lead-free, low-melting 60SnO-10ZnO-30P2O5 (mole%) glass in water. Effects of the sample surface-area on the dissolution rate, ion concentrations in the reacting solution, and the change in glass structure were studied.
When the sample surface-area increased, the weight loss per unit area and ion concentrations per unit area decreased. The major species first dissolved in the initial stage of reaction was the modifier Zn2+, followed by the breakdown of chain structure of (PO4)3- tetrahedron.
According to the structure analysis, the original glass has the pyro-phosphate structure, in which the chains of (PO4)3- tetrahedron were cross-linked by Sn2+ and Zn2+. The chain structure was attacked by water molecule during dissolution.
The dissolution of glass was not homogeneous over the sample surface, resulted from the possible oxidation of some Sn2+ to Sn4+ in the less-etched region.
Advisor Committee Jiin-Jyh Shyu - advisor
Ping-Yu Shih - co-chair
Yi Hu - co-chair
Files Date of Defense 2004-05-28 Date of Submission 2004-07-22