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4,296 Newest Publications in journal of the american ceramic society

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Effect of the Reoxidation on Positive Temperature Coefficient Behavior of BaTiO3–Bi0.5Na0.5TiO3

01-Jun-2010 | Wei, Jifeng; Pu, Yongping; Mao, Yuqin; Wang, Jinfei, Journal of the American Ceramic Society, 2010

As a positive temperature coefficient of resistivity (PTCR) material, (1[minus]x)BaTiO3[ndash]x(Bi0.5Na0.5)TiO3 (BT[ndash]BNT, 0.01[le]x[le]0.08) ceramics without any donor doping were prepared by a conventional solid-state reaction method. All samples were sintered in an N2 atmosphere at 1340°C, ...

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Spark Plasma Sintering of Nanosized Amorphous Silicon Nitride Powder with a Small Amount of Sintering Additive

01-Jun-2010 | Hotta, Mikinori; Shinoura, Takanori; Enomoto, Naoya; Hojo, Junichi, Journal of the American Ceramic Society, 2010

Dense and fine-grained [beta]-Si3N4 ceramics were successfully obtained with a small amount of sintering additives, 1.5 mass% Y2O3 and 0.5 mass% Al2O3, using nanosized amorphous Si3N4 powder by spark plasma sintering at temperatures of 1500°[ndash]1800°C and a pressure of 30 MPa under N2. The ...

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Determination of Subcritical Crack Growth Parameters in Polymer‐Derived SiOC Ceramics by Biaxial Bending Tests in Water Environment

01-Jun-2010 | Schell, Karl G.; Bucharsky, Ethel C.; Oberacker, Rainer; Hoffmann, Michael J., Journal of the American Ceramic Society, 2010

Polymer-derived SiOC ceramics were prepared by field-assisted sintering at 1600°C. In order to characterize this material, X-ray diffractometry, density measurements, and mechanical tests were performed. It was determined that the material is dense and predominantly amorphous with fine ...

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Polymer‐Derived Silicon Oxycarbide/Hafnia Ceramic Nanocomposites. Part II: Stability Toward Decomposition and Microstructure Evolution at T≫1000°C

01-Jun-2010 | Ionescu, Emanuel; Papendorf, Benjamin; Kleebe, Hans‐Joachim; Riedel, Ralf, Journal of the American Ceramic Society, 2010

This study presents first investigations on the high-temperature stability and microstructure evolution of SiOC/HfO2 ceramic nanocomposites. Polymer-derived SiOC/HfO2 ceramic nanocomposites have been prepared via chemical modification of a commercially available polysilsesquioxane by hafnium ...

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Reaction Synthesis and Pressureless Sintering of Cr2AlC Powder

01-Jun-2010 | Panigrahi, Bharat Bhooshan; Chu, Min‐Cheol; Kim, Yong‐Il; Cho, Seong‐Jai; Gracio, Jose J., Journal of the American Ceramic Society, 2010

This work was aimed to produce Cr2AlC powder through two-step reactions and to sinter it under a pressureless condition, and the related synthesis and sintering mechanisms were evaluated. Cr2AlC powder of [sim]9 [mu]m in size was produced using CrCx and Al powders and sintered to a relative ...

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High Thermal Stability and Photoluminescence of Si–N‐Codoped BaMgAl10O17:Eu2+ Phosphors

01-Jun-2010 | Wang, YiFei; Xu, Xin; Yin, LiangJun; Hao, LuYuan, Journal of the American Ceramic Society, 2010

The luminance degradation of BaMgAl10O17:Eu2+(BAM) caused by baking at 600°C was studied. The dissolution of Si[ndash]N into BAM lattice lead to only a reduction in the lattice parameters. Under UV excitation, the Si[ndash]N codoping enhanced the luminescent intensity by a factor of 110% for the ...

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Hydrogen Gas Reaction with Eu3+‐Doped Al2O3–SiO2 Glasses

01-Jun-2010 | Nogami, Masayuki; Watanabe, Kazuhiro; Ito, Yuta; Ito, Hiromasa; Nakano, Hiromi, Journal of the American Ceramic Society, 2010

In this paper, we report on fast permeation rate and reaction of hydrogen gas in alumino-silicate glasses to provide new functional properties. Eu3+:Al2O3[ndash]SiO2 glass was prepared with high europium concentration and heat treated in hydrogen gas atmosphere. The approach involves the ...

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Gas Pressure Sintering of Arbitrary Porous Silicon Nitride Ceramics with High Mechanical Strength

01-Jun-2010 | Li, Yong; Chen, Fei; Li, Ling; Zhang, Weiru; Yu, Honglin; Shan, Yubo; Shen, Qiang; Jiang, Hongyi, Journal of the American Ceramic Society, 2010

Gas pressure sintering is applied to prepare arbitrary porous silicon nitride (Si3N4) ceramics using yttria (Y2O3) as the sintering additive and naphthalene powder as the pore-forming agent. The results obtained show that the porosity of the sintered porous Si3N4 ceramics is 40%[ndash]54% when ...

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Polymer-Derived Silicon Oxycarbide/Hafnia Ceramic Nanocomposites. Part I: Phase and Microstructure Evolution During the Ceramization Process

12-Apr-2010 | Emanuel Ionescu, Benjamin Papendorf, Hans-Joachim Kleebe, Fabrizia Poli, Klaus Müller, Ralf Riedel, Journal of the American Ceramic Society, 2010

Polymer-derived SiOC/HfO2 ceramic nanocomposites were prepared via chemical modification of a commercially available polysilsesquioxane by hafnium tetra (n-butoxide). The ceramization process of the starting materials was investigated using thermal analysis and in situ Fourier-transformed ...

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Synthesis of Nanotube Array Composed of an Amorphous Matrix Embedded with NaCl-Type SiC Crystallites by Chemical Vapor Infiltration Techniques

02-Apr-2010 | Wen Yang, Yanjing Su, Hiroshi Araki, Eiji Abe, Hiroshi Suzuki, Tetsuji Noda, Journal of the American Ceramic Society, 2010

Highly dense oriented arrays of nanotubes were synthesized via a chemical vapor infiltration process using anodic alumina membrane as a template. The nanotubes have a unique granular structure, which is composed of SiC nanocrystals embedded in an amorphous matrix. X-ray diffraction and ...

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