Results 241 to 250 of about 5,414,620 (287)

Physiological aging of an all-ceramic restorative material

Dental Materials, 1991
Ceramic materials exposed to a liquid environment may be subject to stress corrosion and/or time-delayed failure. The intent of this project was to evaluate the susceptibility of a magnesia alumina spinel (Cerestore) to stress corrosion and degradation. Bars 2.5 x 2.5 x 30.0 mm were prepared according to manufacturer's instructions. Specimens were aged
J L, Drummond, D, Novickas, J W, Lenke
openaire   +2 more sources

Translucency of Zirconia Ceramics before and after Artificial Aging

Journal of Prosthodontics, 2018
AbstractPurposeThe aging of zirconia ceramics (Y‐TZP) is associated with tetragonal to monoclinic phase transformation. This change in microstructure may affect the optical properties of the ceramic. This study examines the effect of aging on the translucency of different zirconia materials.Materials and Methods120 disc‐shaped specimens were fabricated
Katarzyna, Walczak, Heike, Meißner, Ursula, Range, Andreas, Sakkas, Klaus, Boening, Mieszko, Wieckiewicz, Ioannis, Konstantinidis   +6 more
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Cypriote ceramics of the Iron Age

2022
International ...
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A. C. Voltage Ageing of Zinc - Oxide Ceramics

IEEE Transactions on Power Delivery, 1986
The study of a.c. voltage ageing, in various fluids (air, SF6, transformer oil), of zinc-oxide based ceramics for HV and EHV surge arresters enabled the following points to be elucidated: - two classes of blocks are identified: those, which exhibit a degradation in air and still a more significant degradation in SF6 or oil, and those which do not show ...
openaire   +1 more source

ZnO–Ag ceramics for ethanol sensors

Ceramics International, 2013
Abstract The structure and electrical properties of the ZnO–Ag (0.001–3 wt%) ceramics in air and in air with the ethanol addition are studied. It was found that electrical parameters are sensitive to the concentration of ethanol in air due to a decrease in the barrier height at the grain boundaries. Silver addition causes a decrease in the density of
A.Yu. Lyashkov, A.S. Tonkoshkur, J.A. Aguilar-Martinez, A.B. Glot   +3 more
openaire   +1 more source

Aging of nickel manganite NTC ceramics

Journal of Electroceramics, 2008
Effect of thermal history and chemical composition on aging of Ni x Mn3 − x O4 +  δ (0.56 ≤ x ≤ 1.0) ceramics was investigated. It was found that all the Ni x Mn3 − x O4 +  δ ceramic samples metallized by co-firing at 1050°C showed significant electrical stability with an aging coefficient less than 1.0%, while aging of those metallized by annealing at
Fang, Dao-lai, Zheng, Cui-hong, Chen, Chusheng, Winnubst, Aloysius J.A.   +3 more
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Ceramics, classification and Iron Age entities

African Studies, 1980
SUMMARY Ceramic style can be used to determine archaeological group identity during the Iron Age for several theoretical and practical reasons: as part of culture it is possessed by groups of people, free to vary regardless of socio‐economic and habitat factors; and it is common, widespread, and variable.
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Down to the Crust: Chemical and Mineralogical Analysis of Ceramic Surface Encrustations on Bronze Age Ceramics from Békés 103, Eastern Hungary

Minerals (Basel, Switzerland), 2021
Paul Duffy, Attila Kreiter, Mark Golitko   +2 more
exaly  

Improvement of the ageing resistance of 2YSZ ceramic

2018
Zirconia is a widely studied ceramic and it is applied in several areas such as engineering (solid oxide fuel cells, thermal barrier coatings) and biomedicine, in areas such as orthopedic and odontology. This material can be applied with the purpose to restore a body function that was compromised by a degenerative disease (orthopedic implants), in ...
openaire   +2 more sources

?AGING? of aluminomagnesia spinel ceramics

Refractories, 1970
N. T. Andrianov, E. S. Lukin, D. N. Poluboyarinov   +2 more
openaire   +1 more source