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  • 1
    Electronic Resource
    Electronic Resource
    Pressureless Sintering the Al〈sub〉2〈/sub〉O〈sub〉3〈/sub〉/SiC Nanocomposites in Deoxidized Atmosphere (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 280-283 (Feb. 2007), p. 1093-1096 
    Details
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Many significant improvements have been shown in mechanical properties of ceramic nanocomposites with ceramic matrix being dispersed with second sub-micro sized (or nano-sized) phase. This study designed and fabricated Al2O3/SiC nanocomposites with a raw material used for 85% alumina as matrix andSiC grits in submicro-scale as dispersion phase via a controlled pressureless sintering in air. With coarse SiC powder as bed powder, both C and SiC powder making deoxidized atmosphere, 85Al2O3/SiC nanocomposites with different SiC contents were densified by pressureless sintering at low temperature. Fracture surface investigation indicated that dense nanocomposites with small grain size were produced. General material properties and microstructure were measured and characterized. The results showed that composites sintered in deoxidized atmosphere had better mechanical properties than those sintered in flowing argon
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/49/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.280-283.1093.pdf
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  • 2
    Electronic Resource
    Electronic Resource
    Processing of Calcium Phosphate Porous Materials by 'Self-Setting' (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 280-283 (Feb. 2007), p. 1563-1566 
    Details
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Macroporous biomaterials based on a-tricalcium phosphate (a-TCP) bone cement with porous structures suitable for implantation purposes were prepared in the present work. According to the reversible swelling/deswelling behavior of gelatin at a single temperature or pH, a “self-setting” method that uses gelatin granules as pore formers was developed to process the porous microstructure. By mixing gelatin powder and bone cement powder (BCP), and adding water (1% solution of NaH2PO4×HO) to form pastes which set within 15 to 30 min, this setted cement was then immerged in deionized water of temperature 25°C or 32°C for hydration. During the hydration, the pH of deionized water after cement pastes were introduced at 32°C changed from 8.6 to 7.2 which caused by the transformation of a-TCP to hydroxyapatite (HA). Meanwhile, gelatin particles will swell by water uptake to form large size spheres in cementmatrix. This swelling behavior is sensitive to the variation of pH value. After hydration for 4 day, a body containing gelatin gel spheres was obtained. Then heating the deionized water to temperature 50°C, gelatin spheres in cement matrix were solved and porous microstructure composed of larger pore sizes corresponding approximately to the average size ofthe swelling gelatin granules was obtained. The porous bodies by this technique were found to have tractable and interconnected porosity in the range of 60~84%, with typical pore sizes ranging from 100~300 microns. This new processing technique can be used in the manufacture of unsintered biomaterials
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/49/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.280-283.1563.pdf
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  • 3
    Electronic Resource
    Electronic Resource
    Microstructure and Phase Composition of (Ce, Mg)-PSZ Ceramics (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 336-338 (Apr. 2007), p. 1194-1196 
    Details
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Magnesia, ceria partially stabilized zirconia (Ce,Mg)-PSZ ceramics with net shapemicrostructure are prepared using a processing method similar to that of conventional Mg-PSZ ceramics,then heat-treated at 1500°C for different time. Microstructure and phase composition of (Ce, Mg)-PSZsamples with different amount of CeO2 doped were investigated using SEM and X-ray diffraction. Theaddition of CeO2 could impede the formation of monoclinic phase and inhibit the growth of cubic grains.A microstructure with net-shape cubic grains, in which tetragonal precipitates interweave to a nanoporousstructure is obtained by adding 4∼8 mol% CeO2 in 10mol% MgO doped zirconia matrix and then heattreatment at 1500°C for different time. The precipitate morophology might be related with the addition ofCeO2 and the heat treatment temperatures
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/53/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.336-338.1194.pdf
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  • 4
    Electronic Resource
    Electronic Resource
    Repairing the Dog's Femoral Defect with the Autologous Osteoblast Integrated the Nano-Calcium Phosphate/Zirconia Scaffold (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 336-338 (Apr. 2007), p. 1662-1665 
    Details
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: In this paper, we study the effect of repairing the dog's femoral defects with the artificial boneintegrating the nano-calcium phosphates/zirconia porous artificial bone scaffold with the autologousosteoblasts. We transplanted the artificial bone to the femoral defect of the dog, and at the same time,simple scaffold and the autologous cancellous bone were implanted as the control group. 3 months afterthe transplantation, the specimen was taken out with complete integration with the bone in these 3 groupsand the bone defect got the complete bone union. The mechanics strength test showed that the group ofthe artificial bone was the strongest, followed by the cancellous bone group, and the simple materialgroup was lower, but the strength was stronger than that before the transplantation. In the sixth month, thecomplete femoral defect repair was found in each group and the complete formation of the Haversiancanal can be found on the histology examination. According to the mechanics strength test, there was nosignificant difference (P〈0.05)
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/53/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.336-338.1662.pdf
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  • 5
    Electronic Resource
    Electronic Resource
    Preparation of Unsintering Calcium Phosphate Macroporous Materials with Hydroxyapatite Nanowhisker In Situ Growth (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 336-338 (Apr. 2007), p. 1609-1611 
    Details
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Unsintering macroporous calcium phosphate scaffolds with macropore sizes of 200∼400μmand hydroxyapatite nanofiber of in-situ growth were prepared by coating porous polyurethane templateswith α-tricalcium phosphate bone cement (CPC) slurry, and their subsequent hydrolysis to calciumdeficient hydroxyapatite (HAp) during the self-setting processes are presented. The effects of Sr2+ (SrNO3)on the nucleation, growth of the hydroxyapatite nanofiber and phase constitution were studied. Theresults show that the main component of the coating is HA after hydrolysis for 72h and the Sr2+ addedcould depress the growth of block or sheet HA crystal and promote the nanowhisker growth. This newprocessing technique can be used to improve the bioactivity of porous polymer template whilemaintaining its macroporous structure
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/53/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.336-338.1609.pdf
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  • 6
    Electronic Resource
    Electronic Resource
    Studies on the band structures of some low-temperature superconductors (1997)
    New York, NY : Wiley-Blackwell
    International Journal of Quantum Chemistry 64 (1997), S. 459-472 
    Details
    ISSN: 0020-7608
    Keywords: low-temperature superconductors ; tight-binding energy-band calculations ; superconducting transition temperatures ; chemical bondings ; Chemistry ; Theoretical, Physical and Computational Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: In the present article, the electronic energy-band structures of 20 series of low-temperature superconductors were investigated employing the tight-binding method within the extended Hückel approximation. The energy bands, the densities of states, and the crystal orbital overlap populations of them are discussed. It is found that, for the crystals in the same series with the same structure type and the component elements in the same group of the periodic table, their overall energy-band structures are similar to each other. The analysis of their chemical bondings shows that the stronger bonding is generally correlated with the lower superconducting transition temperature to some extent. The higher Tc's of 4d metals or compounds relative to those of the corresponding 5d crystals are mainly due to the difference of the electronegativities of metal atoms, while the steric effects play a more important role in the higher Tc of 4d crystals than do those of the corresponding 3d crystals.   © 1997 John Wiley & Sons, Inc. Int J Quant Chem 64: 459-472, 1997
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
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