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URN etd-0829107-194403 Statistics This thesis had been viewed 2954 times. Download 1134 times. Author Chien-Chun Hsieh Author's Email Address No Public. Department Materials Engineering Year 2006 Semester 2 Degree Master Type of Document Master's Thesis Language zh-TW.Big5 Chinese Page Count 71 Title Addition of B2O3 to improve the characteristics of SnO-MgO-P2O5 low-temperature-sealing glasses Keyword sealing/soldering phosphate glasses phosphate glasses sealing/soldering Abstract The conventional low-melting sealing/soldering glasses usually contain large amounts of lead, resulting in deleterious health and environmental effects. As a result, it is important to explore lead-free low-melting sealing/soldering glasses. Phosphate glasses have low viscosities, and thus are possible alternatives to lead glasses. The major shortcomings of phosphate glasses are their poor chemical durability, high thermal-expansion coefficient (CTE), and high crystallizbility. The main objective of the present study is to improve the properties of a low-viscosity 60SnO-10MgO-30P2O5 (mol%) glass by adding 0-6 mol% of B2O3 to the glass composition.
It was found in the present study that the addition of B2O3 promoted the conversion of PO43- unit to BPO4 unit. The addition of B2O3 improved the chemical durability of the glass, suppressed the glass crystallizbility, while increased the glass viscosity. The CTE of the glass is in the range of 106 to 117 × 10-7 K-1, with the minimum value of 106 × 10-7 K-1 when the B2O3 content is 4 mol%. The addition of B2O3 increased the temperature range of sintering for the powders compacts. According to the present experimental results, adding appropriate amounts of B2O3 glass composition is benefit to the application potential of the SnO-MgO-P2O5 glasses.
Advisor Committee Jiin-Jyh Shyu - advisor
Files Date of Defense 2007-07-02 Date of Submission 2007-08-30