Results 231 to 240 of about 5,414,620 (287)
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Journal of Materials Science, 1998
Investigation of electrical, mechanical and microstructural properties of ZnO–NiO two-phase ceramics with respect to the ageing process of the material were performed. Two constituent phases, ZnOss and NiOss were identified in those ZnO–NiO ceramics which exhibit a positive temperature coefficient of electrical resistivity (PTCR anomaly). The origin of
D. Lisjak +3 more
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Investigation of electrical, mechanical and microstructural properties of ZnO–NiO two-phase ceramics with respect to the ageing process of the material were performed. Two constituent phases, ZnOss and NiOss were identified in those ZnO–NiO ceramics which exhibit a positive temperature coefficient of electrical resistivity (PTCR anomaly). The origin of
D. Lisjak +3 more
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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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Aging behavior in Ba0.7Sr0.3Ti0.97Zr0.03O ceramics
Journal of Applied Physics, 2005The polarization aging behavior of the Ba0.7Sr0.3Ti0.97Zr0.03O3 ceramic that presents diffuse phase transition, was investigated at different temperatures. The aging of this system is explained by assuming the existence of two different relaxation regimes, one associated with rapidly relaxing polarized macroregions (τ1) and the other to long time ...
J. Portelles +6 more
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Ageing of dental zirconia ceramics
Journal of the European Ceramic Society, 2012Abstract An in vitro study was designed to monitor the t–m transformation of biomedical grade 3Y-TZP ceramics produced from two ready-to-press granulated powders of the same nominal chemical composition, but differing in their specific surface area.
Tomaž Kosmač, Andraž Kocjan
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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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Aging of thin polyimide-ceramic and polycarbonate-ceramic composite membranes
Industrial & Engineering Chemistry Research, 1993The gas-transport properties of several polymer-ceramic composite membranes with glassy polymer layers having effective thicknesses of approximately 4000 A exhibit strongly time-dependent behavior. The membranes, prepared from polyimide and polycarbonate, demonstrated decreases in gas flux of 40-60% in the first 20 days following manufacture.
Mary E. Rezac +3 more
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Iron Age ceramics from Southwestern Paphlagonia
Anatolia Antiqua, 2013Laflı Ergün, Kan Şahin Gülseren, Patacı Sami. Iron Age ceramics from Southwestern Paphlagonia. In: Anatolia Antiqua, Tome 21, 2013. pp. 33-68.
Laflı, Ergün +2 more
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Stabilization and aging of ceramic suspensions
Refractories, 1983Criteria are proposed for assessing the degree of stabilization and coagulation of ceramic suspensions characterized by the volume increase in the system of kinetically free (for stabilization) or kinetically bound (for coagulation) liquid.
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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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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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