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Title page for etd-0722104-142819


URN etd-0722104-142819 Statistics This thesis had been viewed 3062 times. Download 2040 times.
Author Chih-chun Chiang
Author's Email Address pigmilk@ms3.url.com.tw
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 indicate access worldwide
    Date of Defense 2004-05-28 Date of Submission 2004-07-22


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