Results 261 to 270 of about 184,016 (294)
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2004
The utilization of ceramic materials by man is probably as old as human civilization itself. Stone, obsidian, clay, quartz, and mineral ores are as much a part of the history of mankind as the products which have been made of them. Among these products are tools, earthenware, stoneware, porcelain, as well as bricks, refractories, body paints ...
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The utilization of ceramic materials by man is probably as old as human civilization itself. Stone, obsidian, clay, quartz, and mineral ores are as much a part of the history of mankind as the products which have been made of them. Among these products are tools, earthenware, stoneware, porcelain, as well as bricks, refractories, body paints ...
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Ageing resistance of SiBCN ceramics
Ceramics International, 2015Abstract Amorphous SiBCN alloys are known – depending on the elemental composition – for their thermal stability and high-temperature (up to 1500 °C) oxidation resistance, hardness, optical transparency or electrical and/or thermal conductivity. The paper reports ageing of SiBCN ceramics prepared in the form of thin films in a wide range of elemental
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2002
In this study, the influence of both natural ground dampness and ionising radiation (ER) on the process of aging of archaeological ceramics was investigated. The investigations were carried out using Mossbauer effect (ME), X-ray diffraction (XRD) and γ-ray spectroscopic methods.
A. Amulevičius +3 more
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In this study, the influence of both natural ground dampness and ionising radiation (ER) on the process of aging of archaeological ceramics was investigated. The investigations were carried out using Mossbauer effect (ME), X-ray diffraction (XRD) and γ-ray spectroscopic methods.
A. Amulevičius +3 more
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Accelerate ageing of PZT-type ceramics
Progress in Solid State Chemistry, 2007Abstract Accelerate ageing of lead zirconate–titanate ferroceramics (PZT) by fast neutron irradiation is investigated. The ferroelectric behavior of Pb 1 −w M w (Zr,Ti)O 3 , where w Φ i = (10 13 ÷ 10 18 ) n/cm 2 integrated fluxes. Structural investigations (XRD and SEM) reveal modifications of the microstructure, porosity and elementary cell
M.I. Toacsan +3 more
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ZnO–Ag ceramics for ethanol sensors
Ceramics International, 2013Abstract 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 +3 more
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Aging of nickel manganite NTC ceramics
Journal of Electroceramics, 2008Effect 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 +3 more
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A. C. Voltage Ageing of Zinc - Oxide Ceramics
IEEE Transactions on Power Delivery, 1986The 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 ...
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Physiological aging of an all-ceramic restorative material
Dental Materials, 1991Ceramic 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
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Aging of Strontium Barium Niobate and PLZT Ceramic
Physica Status Solidi (a), 1980SBN 75 and PLZT 8/65/35, two ferroelectrics with different structure and symmetry which exhibit diffused phase transition, show similar aging effects: a lessening of the dielectric losses and of the dielectric dispersion by lowering the low-frequency dielectric constant (DC), a doubling of the hysteresis loop within the slim loop region, a lowering of ...
G. Borchhardt +2 more
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Ceramics, classification and Iron Age entities
African Studies, 1980SUMMARY 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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