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  • 1
    Electronic Resource
    Electronic Resource
    Influence of Pressure on the Crystallization in SiO〈sub〉2f〈/sub〉/SiO〈sub〉2〈/sub〉 Composites (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 336-338 (Apr. 2007), p. 1236-1238 
    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: The influence of pressure on the crystallization behavior in SiO2f/SiO2 composites hotpressedat 1350°C was studied. The crystalline phase composition analysis on SiO2f/SiO2 compositesrevealed that the formation of cristobalite was promoted when the hot-pressing pressure ≤ 12 MPa,however suppressed with higher pressure applied. It can be ascribed to the nucleation mechanismchange from surface nucleation to bulk nucleation. Analysis on relative density as well as fracturemicrostructure of SiO2f/SiO2 composites confirmed the conclusion
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/53/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.336-338.1236.pdf
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  • 2
    Electronic Resource
    Electronic Resource
    Refine Yttria Powder and Fabrication of Transparent Yb,Cr:YAG Ceramics (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Advanced materials research Vol. 15-17 (Feb. 2006), p. 246-250 
    Details
    ISSN: 1662-8985
    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: Commercial Y2O3 powders were subjected to high energy ball milling in a planetaryball mill using high purity alumina balls and vial. The refined Y2O3 power ,withcommercial high-purity Al2O3, Cr2O3 and Yb2O3 powders, were used as rawmaterials. Transparent ytterbium and chromium codoped yttrium aluminum garnet(Yb,Cr:YAG) ceramics were fabricated by a solid-state reaction method. TheYb,Cr:YAG ceramics exhibit a pore free structure and the average grain size is about10 micron. The strong absorptions at 940 and 968 nm of Yb3+ are suitable for InGaAsdiode laser pumping, and there is an absorption band at 1030 nm, which is suitable forpassive Q-switch laser output at 1030 nm. Transparent Yb,Cr:YAG ceramics may be apotential material for compact, efficient, high-stability diode-laser-pumped passiveQ-switched solid-state lasers
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/39/transtech_doi~10.4028%252Fwww.scientific.net%252FAMR.15-17.246.pdf
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  • 3
    Electronic Resource
    Electronic Resource
    Microstructures and Mechanical Properties of Al/Al〈sub〉2〈/sub〉O〈sub〉3〈/sub〉 Cermet Composites Reinforced by Al/Al〈sub〉2〈/sub〉O〈sub〉3〈/sub〉 Core-Shell Particles (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Advanced materials research Vol. 15-17 (Feb. 2006), p. 240-245 
    Details
    ISSN: 1662-8985
    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: Al/Al2O3 cermet composites were fabricated by hot-pressing at thetemperature range of 1350~1450oC from commercial γ - Al2O3 reinforced byAl/Al2O3 core-shell particles, which were synthesized via calcining theAl/AlOOH·nH2O core-shell particles prepared by wet-chemical based method. Thisnewly designed aluminum coated with alumina composite structure can not onlyreduce or resist the oxidization of Al at elevated temperature but also make it possibleto control inter-particle and particle-matrix interactions, and this predesigned structureis expected to improve the following sintering ability and therefore the properties offinal products
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/39/transtech_doi~10.4028%252Fwww.scientific.net%252FAMR.15-17.240.pdf
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  • 4
    Electronic Resource
    Electronic Resource
    Febrication of MWNTs Composites with In Situ Precipitation Method (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Solid state phenomena Vol. 121-123 (Mar. 2007), p. 135-138 
    Details
    ISSN: 1662-9779
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Physics
    Notes: In this article stable multi-walled carbon nanotubes (MWNTs) aqueous suspension with a1.0 wt.% concentration was obtained with a very small quantity of dispersant. Precursor of ceramicswere synthesized in the suspension and densely deposited on the surface of MWNTs successfully bya simple and effective in-situ precipitation method. The most important advantage for the in-situcomposite method is to make MWNTs homogeneously distributed in the matrix. The fully densecompacts were obtained by spark-plasma-sintering (SPS) the in-situ precipitated composite powdersat temperature 200 oC lower than that of composite powders made from the traditional mixingmethod. Furthermore, the microstructure and the mechanical property of the composites are muchbetter than that of traditional method. The in-situ precipitation could be a promising method tofabricate CNTs composites of ceramics matrix especially those hard to sinter
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/23/transtech_doi~10.4028%252Fwww.scientific.net%252FSSP.121-123.135.pdf
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  • 5
    Electronic Resource
    Electronic Resource
    The Core (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Solid state phenomena Vol. 121-123 (Mar. 2007), p. 227-230 
    Details
    ISSN: 1662-9779
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/23/transtech_doi~10.4028%252Fwww.scientific.net%252FSSP.121-123.227.pdf
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  • 6
    Electronic Resource
    Electronic Resource
    Room and Elevated Temperature Mechanical Properties of Hot-Pressed Uni-C〈sub〉f〈/sub〉/SiO〈sub〉2〈/sub〉 Composite (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 546-549 (May 2007), p. 1509-1514 
    Details
    ISSN: 1662-9752
    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: Unidirectional carbon fiber reinforced fused silica (uni-Cf/SiO2) composite was preparedby slurry infiltration and hot-pressing. The room and elevated temperatures flexural properties wereinvestigated and the fracture features of the composite were observed. This composite exhibitednon-catastrophic failure at room and elevated temperatures. The oxidation of carbon fiber at elevatedtemperatures was the main reason for the degradation of flexural strength and elastic modulus. Theflexural strength tested at 1200[removed info] was 376MPa and exhibited anomalously higher than that at 1000[removed info](277MPa), which was attributed to the viscous flow of fused silica matrix and therefore theoccurrence of microcracking in the matrix was deferred. And it was inferred that the brittle to plastictransition temperature (Tb-p) of uni-Cf/SiO2 composite corresponded to a certain temperature around1200°C
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/16/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.546-549.1509.pdf
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  • 7
    Electronic Resource
    Electronic Resource
    State of Magnesia in Magnesia (10.4 mol%)-Doped Zirconia Powder Prepared from Coprecipitation (2002)
    Westerville, Ohio : American Ceramics Society
    Journal of the American Ceramic Society 85 (2002), S. 0 
    Details
    ISSN: 1551-2916
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: MgO (10.4 mol%)-doped ZrO2 powder, which was prepared by coprecipitation and calcination at 750°C, was leached and milled, respectively. The powders were characterized by Auger electron scanning microprobe and XRD technologies. Only the 2.3 mol% MgO was soluble in ZrO2; it stabilized ZrO2 as the metastable tetragonal phase (crystallite size ∼45 nm) at room temperature. The rest of the MgO (8.1 mol%) existed on the surface of the ZrO2 grains in the prepared powder.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1151-2916.2002.tb00271.x
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  • 8
    Electronic Resource
    Electronic Resource
    Electronic and shallow donor impurity states in GaAs-Ga1−xAlxAs quantum-well wires: Effects of dielectric mismatch (1994)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 75 (1994), S. 7389-7393 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The effects of image potential due to dielectric mismatch on electronic and shallow donor impurity states in quasi-one-dimensional GaAs-Ga1−xAlxAs quantum-well wires with rectangular cross section for both finite barrier and infinitely high barrier are investigated. The results have shown that, when the image potential is included, the variations in electronic energy level and impurity binding energy are considerable, especially when the cross-section dimensions of the quantum wire become small. The results also showed that the effects of the impurity ion image potential on impurity binding energy are much larger than those of electron image potential.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.356653
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  • 9
    Electronic Resource
    Electronic Resource
    Creep and Creep-Recovery Behavior in Silicon-Carbide-Particle-Reinforced Alumina (1999)
    Westerville, Ohio : American Ceramics Society
    Journal of the American Ceramic Society 82 (1999), S. 0 
    Details
    ISSN: 1551-2916
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Flexure creep and creep-recovery behavior were investigated for monolithic Al2O3 and 10-vol%-SiC-particle-reinforced Al2O3-matrix composites in an air atmosphere at temperatures of 1160°-1400°C. Two types of SiC particles were used: one has an average size of 2.7 µm and has an amount of SiO2 impurities per unit surface area that is one order of magnitude higher than the other, which has an average size of 0.6 µm. Compared to the creep behavior of monolithic Al2O3, the strain rate of the composites with the 0.6 µm SiC particles (denoted here as S-10) did not decrease; the composites with the 2.7 µm SiC particles (denoted here as L-10) exhibited excellent creep resistance. This difference was related to the microstructural features and the oxidation behavior of the composites: the Al2O3 grains in S-10 were mainly equiaxed, only ∼10% of the Al2O3 grains were elongated, and most of the SiC particles that resided at the grain boundaries or at triple-grain junctions were oxidized during creep, whereas the Al2O3 grains in L-10 were mostly irregularly shaped and elongated and most of the SiC particles were entrapped in the Al2O3 matrix grains, which prevented the oxidation of the SiC particles. These different microstructural features were associated with different amounts of SiO2 impurity content per unit surface area on the SiC particle surfaces. In addition, the monolithic Al2O3 showed no anelastic recovery when the load was removed; however, the composites exhibited significant anelastic recovery, especially for L-10. This phenomenon was attributed to the elongated grain morphology.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1151-2916.1999.tb01858.x
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  • 10
    Electronic Resource
    Electronic Resource
    Mechanical properties and microstructure of ZrO2–SiO2 composite (1997)
    Springer
    Journal of materials science 32 (1997), S. 197-201 
    Details
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract ZrO2–SiO2 composite powder has been prepared by a wet chemical route using zirconyl chloride and fumed silica as starting materials and subsequently sintered by the hot-pressing method to obtain a ZrO2–SiO2 ceramic. The mechanical properties of the silica matrix have been much increased by the addition of 20 vol% zirconia. The microstructural features of the composite are observed by transmission electron microscopy (TEM) and high-resolution electron microscopy (HREM). The stabilibity of tetragonal zirconia in the matrix is attributed to the particle-size effect, and to the constraint effect of the silica matrix and that of the interphasic reaction layer. The increase in mechanical properties is discussed in relation to the residual stress and the enhanced elastic modulus caused by the incorporated ZrO2 particles.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1018556006201
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