scholarly journals Characterizing the residual glass in a MgO/Al2O3/SiO2/ZrO2/Y2O3 glass-ceramic

2016 ◽  
Vol 6 (1) ◽  
Author(s):  
Sabrina Seidel ◽  
Christian Patzig ◽  
Wolfgang Wisniewski ◽  
Antje Gawronski ◽  
Yongfeng Hu ◽  
...  
Keyword(s):  
Glass Ceramic ◽  
Residual Glass

On the Nonlinear Behavior of a Glass-Ceramic Seal and Its Application in Planar SOFC Systems

2006 ◽  
Author(s):  
Ba Nghiep Nguyen ◽  
Brian J. Koeppel ◽  
John S. Vetrano ◽  
Mohammad A. Khaleel
Keyword(s):  
Solid Oxide Fuel Cells ◽  
Glass Ceramic ◽  
Damage Model ◽  
Nonlinear Behavior ◽  
Solid Oxide ◽  
Nonlinear Material ◽  
Progressive Damage ◽  
Oxide Fuel ◽  
Residual Glass ◽  
Potential Damage

This paper studies the nonlinear behavior of a glass-ceramic seal used in planar solid oxide fuel cells (SOFCs). To this end, a viscoelastic damage model has been developed that can capture the nonlinear material response due to both progressive damage in the glass-ceramic material and viscous flow of the residual glass in this material. The model has been implemented in the MSC MARC finite element code, and its validation has been carried out using the experimental relaxation test data obtained for this material at 700°C, 750°C, and 800°C. Finally, it has been applied to the simulation of a SOFC stack under thermal cycling conditions. The areas of potential damage have been predicted.

Alteration of a Zirconolite Glass-Ceramic Matrix under Hydrothermal Conditions

2002 ◽  
Vol 713 ◽  
Author(s):  
Christelle Martin ◽  
Isabelle Ribet ◽  
Thierry Advocat
Keyword(s):  
Ceramic Material ◽  
Glass Ceramic ◽  
Glass Phase ◽  
Initial Rate ◽  
Ceramic Matrix ◽  
Glass Ceramic Material ◽  
Residual Glass ◽  
Hydrothermal Conditions ◽  
Reactive Surface Area ◽  
Ceramic Matrices

ABSTRACTGlass-ceramic matrices based on zirconolite (CaZrTi2O7) are being considered for specific conditioning of plutonium or the minor actinides. The actinides are distributed throughout the zirconolite crystals and the residual glass phase. Since zirconolite alteration is extremely limited, however, actinide release from the glass-ceramic material is mainly attributable to alteration of the residual glass. Zirconolite glass-ceramic specimens and specimens corresponding to the residual glass phase alone were therefore altered under hydrothermal conditions (150°C) and under initial rate conditions (100°C) to compare their kinetic behavior and estimate the effect of the crystals on material alteration. Under hydrothermal conditions, alteration occurred during the first few days: SEM observations showed greater alteration of the glass-ceramic material due to a phenomenon of preferential glass alteration around the zirconolite crystals; after three days the alteration rate had considerably diminished and both specimens exhibited similar behavior. Under initial rate conditions the initial rates differed due to a variation in the reactive surface area of the glass-ceramic.

scholarly journals A glass-ceramic material for fixation of radioactive waste

2011 ◽  
Vol 43 (2) ◽  
pp. 225-229 ◽  
Author(s):  
L.S. Bozadzhiev ◽  
G.T. Georgiev ◽  
R.L. Bozadzhiev
Keyword(s):  
Radioactive Waste ◽  
Ceramic Material ◽  
Glass Ceramic ◽  
Glass Ceramic Material ◽  
Residual Glass ◽  
Starting Mixture

In this article, a starting mixture for the preparation of glass-ceramic material for radioactive waste (RW), consisting of 85-95 mass % basanite and 5-15 mass % oxides of elements in I-VIII group of the Periodical table of elements imitating RW, is proposed. The glass-ceramic material is obtained by melting the starting mixture in air at 1450?C for 1 hour and by further crystallization of the melts at 950?C for 30 minutes. It has been noticed that the texture of the glass-ceramic material is microgranular. The main mineral is pyroxene, while a mixture phases are magnetite, hematite and residual glass. It was shown that the RW elements are fixed in the pyroxene and partly in the admixture phases.

Controlled Crystallization and Characterization of Li2O-Al2O3-SiO2-P2O5 Glass-Ceramic

2013 ◽  
Vol 278-280 ◽  
pp. 418-421
Author(s):  
Na Zhao
Keyword(s):  
Glass Ceramic ◽  
Glass Phase ◽  
Analytic Model ◽  
High Melting ◽  
Residual Glass ◽  
High Melting Point ◽  
Transparent Glass ◽  
Controlled Crystallization ◽  
Transparent Glass Ceramic

the controlled crystallization and characterization of Li2O-Al2O3-SiO2-P2O5 glass ceramic by XRD and numerical calculus. The results indicate that the controlled model of crystallization is the process though controlling the growing size of crystallization grain by forming residual glass phase with high melting point, and proper high-melting supplement such as Y2O3、Al2O3 can reduce crystal grain size at the same time that does not change nucleation quantity. At last, transparent glass-ceramic with little crystal grain can be obtained by the theorizing analytic model.

Residual glass and crystalline phases in a barium disilicate glass–ceramic

2015 ◽  
Vol 110 ◽  
pp. 192-196 ◽  
Author(s):  
Marcel C.C. Araujo ◽  
Walter J. Botta ◽  
Michael J. Kaufmann ◽  
Romulo S. Angelica ◽  
José M.R. Mercury ◽  
...  
Keyword(s):  
Glass Ceramic ◽  
Residual Glass ◽  
Crystalline Phases

Crystallization sequence of an A1N-Y2O3-SiO2 glass-ceramic

1986 ◽  
Vol 44 ◽  
pp. 446-447
Author(s):  
T.R. Dinger ◽  
G. Thomas
Keyword(s):  
High Temperature ◽  
Glass Ceramic ◽  
Crystallization Behavior ◽  
High Stress ◽  
Crystallization Sequence ◽  
Sio2 Glass ◽  
Structural Applications ◽  
Ceramic Precursors

The use of Si3N4, alloys for high temperature, high stress structural applications has prompted numerous studies of the oxynitride glasses which exist as intergranular phases in their microstructures. Oxynitride glasses have been investigated recently in their bulk form in order to understand their crystallization behavior for subsequent Si3N4 applications and to investigate their worth as glass-ceramic precursors. This research investigates the crystallization sequence of a glass having a normalized composition of Y26Si30Al11 ON11 and lying in the A1N-Y2O3-SiO2 section of the Y-Si-Al-O-N system. Such glasses exist as intergranular phases in the technologically important Y2O3/Al2O3-fluxed Si3N4 alloys.

970 nm Infrared to Visible Upconversion in Er3+ and Yb3+ Co-Doped PLZT Glass Ceramic Thin Films

2008 ◽  
Author(s):  
Xiaomei Guo ◽  
Kewen Kevin. Li ◽  
Xuesheng Chen ◽  
Yingyin Kevin. Zou ◽  
Hua Jiang
Keyword(s):  
Thin Films ◽  
Glass Ceramic ◽  
Ceramic Thin Films ◽  
Co Doped

FLY ASH FROM THERMAL POWER PLANT, RAW MATERIAL FOR GLASS-CERAMIC

2013 ◽  
Vol 12 (2) ◽  
pp. 337-342 ◽  
Author(s):  
Firuta Goga ◽  
Roxana Dudric ◽  
Calin Cormos ◽  
Florica Imre ◽  
Liliana Bizo ◽  
...  
Keyword(s):  
Fly Ash ◽  
Power Plant ◽  
Glass Ceramic ◽  
Thermal Power Plant ◽  
Thermal Power ◽  
Raw Material ◽  
Plant Raw Material
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