scholarly journals The Effect of A-Site Cation on the Formation of Brannerite (ATi2O6, A = U, Th, Ce) Ceramic Phases in a Glass-Ceramic Composite System

MRS Advances ◽  
2019 ◽  
Vol 5 (1-2) ◽  
pp. 73-81 ◽  
Author(s):  
Malin C. Dixon Wilkins ◽  
Martin C. Stennett ◽  
Neil C. Hyatt
Keyword(s):  
Oxidation State ◽  
Glass Ceramic ◽  
Ceramic Composite ◽  
Composite System ◽  
Glass Ceramics ◽  
Inert Atmosphere ◽  
Oxidation States ◽  
A Site ◽  
Glass Ceramic Composite ◽  
Process Atmosphere

ABSTRACTA range of stoichiometric and mixed A-site cation brannerite glass-ceramics have been synthesised and characterised. The formation of UTi2O6 in glass is reliant on ensuring all uranium remains tetravalent by processing in an inert atmosphere. ThTi2O6 forms in glass under both inert and oxidising atmospheres due to the lack of other easily available oxidation states. CeTi2O6 could not be made to form within this glass system. The formation of A0.5B0.5Ti2O6 phases depends strongly on the oxidation states of the A and B cations available in the process atmosphere, with the most successful compositions having an average final oxidation state of (A,B)4+. Mixed cation brannerite compositions that formed in argon include U0.75Th0.25Ti2O6 and U0.71Ce0.29Ti2O6. Those forming in air include U0.23Th0.77Ti2O6, Th0.37Ce0.63Ti2O6, and U0.41Ce0.59Ti2O6.

Defect Observation of Embedded Components of a Low Temperature Co-Fired Ceramic

2010 ◽  
Vol 654-656 ◽  
pp. 2394-2397 ◽  
Author(s):  
Rosidah Alias ◽  
Sabrina Mohd Shapee ◽  
Mohd Zulfadli Mohamed Yusoff ◽  
Ibrahim Azmi ◽  
Zulkifli Ambak ◽  
...  
Keyword(s):  
Surface Roughness ◽  
Low Temperature ◽  
Glass Ceramic ◽  
Ceramic Composite ◽  
Composite System ◽  
Surface Defects ◽  
Densification Process ◽  
Density Surface ◽  
Kinetics Of ◽  
Glass Ceramic Composite

This paper reports observations of defects in laminated eight layers of a glass-ceramic composite system fabricated by a standard low temperature co-fired ceramic (LTCC) technology. The layers were laminated at 3000 psi and 70 °C for 10 minutes and were fired at 850 °C for 15 minutes. Material characterizations of the green compact and fired substrate were carried out on density, surface roughness and microstructure. The crack and warpage of the substrate were related to the microstructure and densification process of the system. It was found that the presence of these defects could be due to a mismatch of the sintering kinetics of the glass-ceramic composite system and silver conductor materials which lead to the development of stresses which act on both materials. The detailed microscopic observation of the internal and surface defects is explained.

Glass Ceramic Composite Protective Technological Coatings for Thermomechanical Processing of Intermetallic Alloys

2017 ◽  
Vol 73 (9-10) ◽  
pp. 381-385 ◽  
Author(s):  
V. A. Rozenenkova ◽  
S. S. Solntsev ◽  
N. A. Mironova ◽  
S. V. Gavrilov
Keyword(s):  
Glass Ceramic ◽  
Ceramic Composite ◽  
Thermomechanical Processing ◽  
Intermetallic Alloys ◽  
Glass Ceramic Composite

scholarly journals Preparation of Apatite-Wollastonite-Phlogopite glass-ceramic composites by powder sintering method

2013 ◽  
Vol 45 (3) ◽  
pp. 331-339
Author(s):  
A. Faeghi-Nia
Keyword(s):  
Activation Energy ◽  
Particle Size ◽  
Glass Ceramic ◽  
Ceramic Composite ◽  
Ceramic Composites ◽  
Powder Sintering ◽  
Powdered Glass ◽  
Activation Energy Of Sintering ◽  
Sintering Method ◽  
Glass Ceramic Composite

An Apatite-Wollastonite-Phlogopite glass-ceramic composite, was developed by sintering and crystallization of the powdered glass. The non-isothermal and isothermal sintering kinetics were studied for this glass-ceramic. Hot-stage microscopy (HSM) measurements demonstrated that it is possible to sinter and crystallize this glass-ceramic with 80% relative density. The activation energy of sintering was analyzed using previously reported model of sintering and it was obtained Q=193.83 KjmolK-1. Also it was shown that the microstructure of sample is a function of particle size distribution.

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