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URN etd-0709104-011933 Statistics This thesis had been viewed 4303 times. Download 2907 times. Author Hung-Chuan Mai 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 58 Title Middle IR Transmitting Calcium Aluminate Glass-Ceramics Keyword glass-ceramics Calcium aluminate glass Calcium aluminate glass glass-ceramics Abstract Calcium aluminate glass has good optical transmission in the middle infrared (3~5μm) range. In this study, the glasses were prepared from reagent-gade chemicals Mg(OH)2, CaCO3, BaCO3 ,Al2O3, and 9wt% ZrO2 which acts as nucleating agent, by quenching method. The glass-ceramics, which are transmitting in the middle IR region and have improved mechanical strength, were made from the parent glass via suitable crystallization heat-treatment. The major crystalline phase, Ca3Al2O6 (petaline), uniformly nucleated and crystallized in the glass matrix. When the crystallization temp./time increased, BaAl2O4 nucleated from the sample surface and grew along the residual glass, forming a surface layer.
The glass-ceramics exhibit slightly decreased but acceptable transmissivity in the middle IR region and improved mechanical strength.
Advisor Committee Jiin-Jyh Shyu - advisor
Jenn-Ming Wu - co-chair
Y.J. Lin - co-chair
Files Date of Defense 2004-06-02 Date of Submission 2004-07-09