Journal of the American Ceramic Society

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Dependence of Apatite Formation on Silica Gel on Its Structure: Effect of Heat Treatment
Journal of the American Ceramic Society - Tập 78 Số 7 - Trang 1769-1774 - 1995
Sung‐Baek Cho, Kazuki Nakanishi, Tadashi Kokubo, Naohiro Soga, Chikara Ohtsuki, Takashi Nakamura, Toshiaki Kitsugi, Takao Yamamuro
The prerequisite for glasses and glass‐ceramics to bond to living bone is the formation of biologically active bonelike apatite on their surfaces in the body. Our previous study showed that a silica gel prepared by hydrolysis and polycon‐ densation of tetraethoxysilane in aqueous solution containing poly(ethy1ene glycol) induces apatite nucleation on its surface in a simulated ...... hiện toàn bộ
Electric Current Activation of Sintering: A Review of the Pulsed Electric Current Sintering Process
Journal of the American Ceramic Society - Tập 94 Số 1 - Trang 1-19 - 2011
Zuhair A. Munir, Dat V. Quach, Manshi Ohyanagi
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
Microstructural Coarsening During Sintering of Boron Carbide
Journal of the American Ceramic Society - Tập 72 Số 6 - Trang 958-966 - 1989
S. L. Dole, S. Procházka, Robert H. Doremus
The sintering behavior of boron carbide was investigated with particular attention given to microstructure development at various stages in the sintering process. Hot‐pressing and pressureless sintering techniques were employed and the effects of heating rate, firing atmosphere, and composition were used to characterize the sintering behavior. Pressureless sintering at temperatures up to 2...... hiện toàn bộ
Equilibrium Cation Distribution in NiAl2O4, CuAl2O4, and ZnAl2O4 Spinels
Journal of the American Ceramic Society - Tập 55 Số 8 - Trang 395-398 - 1972
RICHARD F. COOLEY, James S. Reed
Stoichiometric NiAl2O4, CuAl2O4, and ZnAl2O4 spinels were prepared and equilibrated at temperatures from 600° to 1400°C. The parameters u and x, denoting the oxygen position and fraction of divalent cations on te...... hiện toàn bộ
Properties of Boron Nitride (BxNy) Films Produced by the Spin‐Coating Process of Polyborazine
Journal of the American Ceramic Society - Tập 83 Số 11 - Trang 2681-2683 - 2000
Joong‐Gon Kho, Kyo‐Tae Moon, Jong‐Hee Kim, Dong‐Pyo Kim
Boron‐rich boron nitride (BN) films have been prepared on Si and SiO2/Si substrates by the vacuum pyrolysis of spin‐coated polyborazine films. Physical properties of the prepared films such as film strength, thermal conductivity, and dielectrics were determined. The BN films vacuum‐pyrolyzed at 900°C showed residual N–H bonds with a 0.75 N/B ratio, interdiffusion pheno...... hiện toàn bộ
Hydrothermal Corrosion and Strength Degradation of Aluminum Nitride Ceramics
Journal of the American Ceramic Society - Tập 83 Số 12 - Trang 3216-3218 - 2000
Hiroyasu Tamai, Takashi Hamauzu, Akihito Ryumon, Kaoru Aoki, Kōhei Oda, Tetsuo Yoshio
The hydrothermal corrosion and strength degradation of aluminum nitride (AlN) ceramics were investigated. The weight gain in AlN ceramics after corrosion occurred because of the formation of boehmite. The reaction kinetics of AlN with water were diffusion controlled through the boehmite product layer. At 180°C, immersion in water caused no strength degradation, and water vapor caused a 20%...... hiện toàn bộ
Positive Temperature Coefficient of Resistivity in Ba1‐xSrxPb1+yO3‐8 Ceramics
Journal of the American Ceramic Society - Tập 76 Số 8 - Trang 2053-2058 - 1993
Hidetoshi Nagamoto, Hiroshi Kagotani, Tatsuya Okubo, Toshiyuki Koya
The positive temperature coefficient of resistivity (PTCR) effect in Ba1‐xSrxPb1+yO3‐s ceramics is systematically studied. The influence of the preparation conditions on the PTCR properties is experimentally tested. The PTCR effect in metallic‐conducting BaPb1+yO3 i...... hiện toàn bộ
Preparation of Monolithic Silica Aerogel of Low Thermal Conductivity by Ambient Pressure Drying
Journal of the American Ceramic Society - Tập 90 Số 7 - Trang 2003-2007 - 2007
Te‐Yu Wei, Tso‐Fu Mark Chang, Shih‐Yuan Lu, Yu‐Cheng Chang
Monolithic silica aerogels with thermal conductivity as low as 0.036 W·(m·K)−1 and porosity as high as 97% were successfully prepared by ambient pressure drying through a multiple modification approach. This approach may replace the more costly and dangerous operation of supercritical drying. The tetraethoxysilane (TE...... hiện toàn bộ
Polymer‐derived ceramic aerogels as sorbent materials for the removal of organic dyes from aqueous solutions
Journal of the American Ceramic Society - Tập 101 Số 2 - Trang 821-830 - 2018
Maria Concetta Bruzzoniti, Marta Appendini, Luca Rivoira, Barbara Onida, Massimo Del Bubba, Prasanta Jana, Gian Domenico Sorarù
AbstractPolymer‐derived SiC and SiOC aerogels have been synthesized and characterized both from the microstructural point of view and as sorbent materials for removing organic dyes (Methylene Blue, MB, and Rhodamine B, ... hiện toàn bộ
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