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Crystallization Dynamics And Applications Of Borosilicate Glasse-ceramics

Posted on:2010-01-13Degree:DoctorType:Dissertation
Country:ChinaCandidate:T SunFull Text:PDF
GTID:1101360308969559Subject:Materials science
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Borosilicate glass-ceramics has a broad application prospects in information and energy industry owing to its unique properties such as low-melting temperature, high chemical stability, good adjustability of thermal expansion coefficient, and good dielectric properties, etc. Two important applications of borosilicate glass-ceramics are boron-doped silicon wafer diffusion source and sealants for solid oxide fuel cell (SOFC), also being one of the hot research topics, currently.In this study, B2O3-Al2O3-SiO2 and BaO-Al2O3-B2O3-SiO2 glass-ceramics were prepared by melt-quenching method. According to the application background, also with the use of crystallization dynamics research methods, compositional effects on crystallization behavior, microstructure and related properties of glass-ceramics were investigated. The test of glass-ceramics products used as boron-doped silicon wafer diffusion source was conducted too.Compositional study of B2O3-Al2O3-SiO2 glass-ceramics diffusion source shows that the status of Si4+ in the glass network weakened with the B2O3/SiO2 ratio increasing, while B3+ strengthened according to the IR spectra. Large quantities of B2O3 introduced to glass composition leads to the conversion of [BO4] units to [BO3] units. The main crystalline phase is Al4B2O9 and Al18B4O33. The increase of B2O3 content helps to improve the crystallization capacity of the glass and the crystallization of Al4B2O9. The alkaline earth oxides can effectively facilitate the formation of B2O3-Al2O3-SiO2 glass, and crystallinity increased follows the order of BaO
Keywords/Search Tags:Borosilicate glass-ceramics, Crystallization behavior, Microstructure, Boron diffusion source, SOFC sealing
PDF Full Text Request
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