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URN etd-0722104-100428 Statistics This thesis had been viewed 3254 times. Download 2303 times. Author Chin-Hsien Yeh Author's Email Address email@example.com Department Materials Engineering Year 2004 Semester 2 Degree Master Type of Document Master's Thesis Language English Page Count 56 Title Lead-Free, Low Melting SnO-MgO-P2O5 Glasses Keyword Solder and Sealing glasses Phosphate glasses Phosphate glasses Solder and Sealing glasses Abstract The main objective of this thesis is to develop lead-free, low melting SnO-MgO-P2O5 glasses as an alternative to toxicity PbO-based soldering and sealing glass frits for low-temperature sealing applications. The glasses were melted in alumina crucibles for 10-30 min at 950-1200?C. To maintain a reducing atmosphere during melting, addition of carbonaceous additive and N2 atmosphere is necessary. The melts were poured onto a Cu plate, and then annealed at 300?C for 1-3 h. The glass formation region was examined in this study. The glasses are colorless. Glasses with a P2O5 content ? 35 mole% contained small bubbles. The increase in the MgO and P2O5 contents increased the melting temperature.
The glasses have dilatomeric softening temperature (Tds) of 290-420?C, glass transition temperature (Tg) of 270-400?C, and thermal expansion coefficient (CTE) of 110-160 ×10-7 K-1. For the glasses with a constant P2O5 content, the decrease in the SnO/(SnO+MgO) ratio increased the glass melting temperature, Tg, and Tds, while decreases CTE. Moreover, in general, the chemical durability first increased then reduced.
The dilatometric softening temperature and chemical durability of several glasses in the SnO-MgO-P2O5 system are better than the commercial PbO-ZnO-B2O3 frit.
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