Journal of the American Ceramic Society

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Microstructural Characterization of Commercial Hot‐Pressed Boron Carbide Ceramics
Journal of the American Ceramic Society - Tập 88 Số 7 - Trang 1935-1942 - 2005
Mingwei Chen, James W. McCauley, Jerry C. LaSalvia, Kevin J. Hemker
Two commercial hot‐pressed boron carbide ceramics were investigated by transmission electron microscopy. Atomic‐scale observations suggest that the grain boundaries of the two materials are free of grain‐boundary films. Two triple‐junction phases were found and characterized to be rhombohedral Fe2B103 and orthorhombic Ti3... hiện toàn bộ
Gas Sensing Behavior of Mesoporous SiOC Glasses
Journal of the American Ceramic Society - Tập 96 Số 8 - Trang 2366-2369 - 2013
Aylin Karakuscu, Andrea Ponzoni, Aravind Parakkulam Ramaswamy, Giorgio Sberveglieri, Gian Domenico Sorarù
In this study, for the first time, we report the gas sensing behavior of aerogel‐derived silicon oxycarbide (SiOC) glasses. The SiOC glass pyrolyzed at 1400°C has specific surface area of 150 m2/g with pore size in the 2–20 nm range. SiOC sensor shows good response to 5 ppm NO2 at 300°C....... hiện toàn bộ
Chemical Compatibility Investigation of Thin‐Film Oxygen Transport Membranes on Metallic Substrates
Journal of the American Ceramic Society - Tập 94 Số 3 - Trang 861-866 - 2011
Ye Xing, Stefan Baumann, Doris Sebold, Matthias Rüttinger, Andreas Venskutonis, Wilhelm Albert Meulenberg, D. Stöver
Thin‐film La0.58Sr0.4Co0.2Fe0.8O3−δ (LSCF58428) exhibits high oxygen permeability due to its high ionic and electronic conductivity. In order to increase the oxygen flux, a thin‐film membrane on a structural substrate is beneficial. Different Ni‐based alloys were studied as ...... hiện toàn bộ
Characterization of Porosity in Porcelain‐Bonded Porous Alumina Ceramics
Journal of the American Ceramic Society - Tập 52 Số 10 - Trang 543-548 - 1969
Sunil K. Roy
A water removal method was used to determine pore sizes in highly porous large‐pore‐size specimens. The maximum, minimum, and equivalent pore sizes, as well as complete size distributions (number of pores vs pore sizes), were obtained. The results agree with those obtained using a mercury porosimeter. Characterizing parameters such as permeable porosity, labyrinth factor, and structure fac...... hiện toàn bộ
Hot Pressing of Potassium‐Sodium Niobates
Journal of the American Ceramic Society - Tập 45 Số 5 - Trang 209-213 - 1962
R. E. Jaeger, L. Egerton
Compositions in the system KNbO3‐NaNbO2 have been hot‐pressed to yield ceramics with relative densities greater than 99%. Because these materials lack any degree of pyroplastic behavior, temperatures approaching those required for air sintering are needed. These hot‐pressed specimens exhibit a finer microstructure than that obtainable by convention...... hiện toàn bộ
Piezoelectric and Dielectric Properties of Ceramics in the System Potassium—Sodium Niobate
Journal of the American Ceramic Society - Tập 42 Số 9 - Trang 438-442 - 1959
L. Egerton, DOLORES M. DILLON
High radial coupling coefficients are observed for compositions having up to 50 mole % sodium niobate additions to potassium niobate. The activity diminishes with additional sodium niobate content and disappears beyond about 98 mole % additions. Dielectric constants are relatively low, varying from 450 to 125, depending on composition. A.‐c. losses are high and d.‐c. resistivities are ∼10<...... hiện toàn bộ
Effect of Potassium Sodium Tartrate and Sodium Citrate on the Preparation of α‐Calcium Sulfate Hemihydrate from Flue Gas Desulfurization Gypsum in a Concentrated Electrolyte Solution
Journal of the American Ceramic Society - Tập 92 Số 12 - Trang 2894-2899 - 2009
Zhuoxian Shen, Baohong Guan, Hailu Fu, L. C. Yang
Flue gas desulfurization (FGD) gypsum mainly composed of calcium sulfate dihydrate (DH) was used as a raw material to obtain α‐calcium sulfate hemihydrate (α‐HH) through dehydration in a Ca–Mg–K–Cl‐solution medium at 95°C under atmospheric pressure. The effects of potassium sodium tartrate and sodium citrate on the preparation of α‐HH in the electrolyte solution were investigat...... hiện toàn bộ
Elaboration and Luminescent Properties of Eu/Tb Co‐Doped GdPO4‐Based Glass Ceramics for White LEDs
Journal of the American Ceramic Society - Tập 95 Số 4 - Trang 1178-1181 - 2012
Hai Guo, Fang Li, Rongfei Wei, Hao Zhang, Chong‐Geng Ma
Eu/Tb single‐doped and co‐doped oxyfluoride aluminosilicate glasses and glass ceramics containing GdPO4 nanocr...... hiện toàn bộ
Luminescence Properties of Tb–Eu Co‐Doped Aluminosilicate and Zinc Silicate Glasses
Journal of the American Ceramic Society - Tập 95 Số 1 - Trang 275-279 - 2012
Xiaoli Liang, Zhenyu Lin, Yunxia Yang, Zhongwen Xing, Guorong Chen
In this article, we report the luminescent properties and energy transfer behavior of Tb and Eu in aluminosilicate and zinc silicate glasses. Both glass systems exhibit a combination of blue, green, and red emissions. ...... hiện toàn bộ
Reduction and Sintering of a Nickel–Dispersed‐Alumina Composite and Its Properties
Journal of the American Ceramic Society - Tập 80 Số 5 - Trang 1139-1148 - 1997
Tohru Sekino, Toshio Nakajima, Satoru Ueda, Koichi Niihara
High‐density nickel–dispersed‐alumina (Al2O3/nickel) composites with superior mechanical properties were obtained by the hydrogen reduction and the hot pressing of alumina–nickel oxide (Al2O3/NiO) mixed powders. The mixtures were prepared by using NiO or nickel nitrate (Ni(NO3)... hiện toàn bộ
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