کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
5440243 1510140 2018 7 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Full Length ArticleControlled precipitation of lithium disilicate (Li2Si2O5) and lithium niobate (LiNbO3) or lithium tantalate (LiTaO3) in glass-ceramics
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد سرامیک و کامپوزیت
پیش نمایش صفحه اول مقاله
Full Length ArticleControlled precipitation of lithium disilicate (Li2Si2O5) and lithium niobate (LiNbO3) or lithium tantalate (LiTaO3) in glass-ceramics
چکیده انگلیسی

In the present study, the crystallization principles and phenomena of base glasses from the system of SiO2-Li2O-P2O5-Al2O3-K2O-Nb2O5 or Ta2O5 were investigated. Annealing parameters such as temperature and time were varied. Annealing the base glasses 10 min at temperatures <850 °C for Nb2O5 or Ta2O5 containing samples lead to the crystallization of Li2SiO3. At higher annealing temperatures or longer annealing times, Li2SiO3 disappeared and Li2Si2O5 was the main crystal phase in all glass-ceramics. After the dissolution of Li2SiO3, the minor crystal phases of LiNbO3 or LiTaO3 were precipitated. Increasing the annealing temperatures as well as the annealing times lead to higher bending strengths up to about 676 MPa and CR-values of up to 100. Increasing the contents of Nb2O5 or Ta2O5 lead to higher CR-values. The radiopacities increased up to 355% compared to aluminum.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of the European Ceramic Society - Volume 38, Issue 1, January 2018, Pages 263-269
نویسندگان
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