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  • 1
    Electronic Resource
    Electronic Resource
    Strong, High-Temperature Ceramics (1974)
    Palo Alto, Calif. : Annual Reviews
    Annual Review of Materials Research 4 (1974), S. 365-390 
    Details
    ISSN: 0084-6600
    Source: Annual Reviews Electronic Back Volume Collection 1932-2001ff
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1146/annurev.ms.04.080174.002053
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  • 2
    Electronic Resource
    Electronic Resource
    Compact Formation during Colloidal Isopressing (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: In colloidal isopressing, a preconsolidated slurry with a high relative density (∼0.58) is converted into an elastic body (compact) under the influence of an isostatic pressure. Experiments suggest that during isopressing, the preconsolidated slurry is separated from the elastic body by a transition plane that rapidly moves into the preconsolidated slurry, leaving behind the elastic body which is formed against a piece of porous material present within the rubber mold. The porous material will accommodate the liquid phase squeezed out of the preconsolidated slurry, allowing for the conversion to the denser elastic body (∼0.63). The results of experiments with varied isopressure are compared with simulations based on a filtration model. The good agreement indicates that colloidal isopressing can be considered a special case of consolidation via pressure filtration. Compared with conventional pressure filtration, the extremely rapid consolidation is due to the high relative density of the preconsolidated slurry used to fill the mold as well as the high applied isopressure. The simulation used here is a useful tool in the design and understanding of shape forming by colloidal isopressing and shows how process variables such as particle size, relative density, and applied pressure influence compact formation time.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1151-2916.2002.tb00296.x
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  • 3
    Electronic Resource
    Electronic Resource
    Microscale lithography via channel stamping: Relationships between capillarity, channel filling, and debonding (1999)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 74 (1999), S. 1332-1334 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A polymer or metallo-organic precursor solution may be transferred from the channels of a stamp to a substrate producing a micron or submicron scale pattern. The stamped polymer pattern is used as a mask for device fabrication. The stamped metallo-organic precursor solution is heat treated to produce a metal or ceramic pattern directly. Here we report conditions that optimize the filling of channels, the debonding of the solution from the channels during evaporation, and the transfer of the pattern to a substrate. We show that poor wetting can optimize these conditions. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.123541
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  • 4
    Electronic Resource
    Electronic Resource
    Metalorganic deposition of high critical current thin films in the Bi-Sr-Ca-Cu-O system on {100} LaAlO3 substrates (1992)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 61 (1992), S. 351-353 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Superconducting thin films of the two Cu-layer phase in the Pb-doped Bi-Sr-Ca-Cu-O system have been fabricated on {100} LaAlO3 single crystals by the metalorganic deposition from ethyl hexanoate precursors. Thin films given heat treatments in air at 850–860 °C had resistive transitions with a Tc of 86–89 K. The zero-field transport critical current densities were in the range of 2–4×105 A/cm−2 at 77 K and 106 A cm−2 at 45 K in 200–300-nm-thick films. In contrast to c-axis oriented films grown on {100} MgO, x-ray pole figures show that the films grown on {100} LaAlO3 are epitaxial, a result confirmed by electron channeling patterns.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.107934
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  • 5
    Electronic Resource
    Electronic Resource
    Phase development of Tl2Ba2CaCu2O8 thin films on LaAlO3 substrates (1993)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 62 (1993), S. 3028-3030 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The evolution of phases leading to the formation of epitaxial films of nominal composition Tl2Ba2CaCu2O8 on (100) LaAlO3 by post-deposition annealing of amorphous precursor films has been investigated by examining interrupted heat-treatment samples using analytical microscopy and x-ray diffraction. The superconductor, with a composition of Tl1.8Ba2Ca0.94Cu2.6Ox, forms from a melt, which itself formed from intermediary crystalline phases during the continual loss of Tl2O. It is concluded that Tl1.8Ba2Ca0.94Cu2.6Ox, Cu2O, and Tl3Ca5Ox are in subsolidus equilibrium and that a melt phase exists between at least 780 and 860 °C under reducing conditions controlled by the Tl2O vapor.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.109149
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  • 6
    Electronic Resource
    Electronic Resource
    Dispersion and Consolidation of Alumina Using a Bis-Hydrophilic Diblock Copolymer (2000)
    Westerville, Ohio : American Ceramics Society
    Journal of the American Ceramic Society 83 (2000), 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: A water-soluble diblock copolymer, poly[(methacrylic acid)-b-(ethylene oxide)], has been used to formulate alumina slurries that are dispersed over a wide range of pH through a combination of electrostatic and steric repulsion. The anionic poly(methacrylic acid) block, a short chain (MW∼700 g/mol), interacts with the amphoteric alumina surface at pH 3 and acts as an anchor block. The nonionic poly(ethylene oxide) (PEO) block (MW= 3000 g/mol) only appears to have a steric functionality. At high pH, the polymer coated surface has a net negative charge due to the excess negative sites associated with the highly dissociated methacrylic acid (MAA) units; this provides electrostatic repulsion at, for example, pH 9, which is the isoelectric point for pure alumina. The PEO chains extend from the surface and stabilize the alumina particles between pH 5 to 9 via an entropy-driven, steric repulsion. The PEO chains provide the dominating dispersive force at low pH, where very little electrostatic repulsion is possible because the positive surface charge of alumina has been neutralized by the negative sites of the adsorbed polyacid. On consolidation through pressure filtration at low pressures (2 to 5 MPa), the saturated, consolidated bodies formulated at pH 5 have a relative density of ∼0.56. These consolidated bodies initially exhibit a flow stress, but then fluidize after an extended strain (up to 0.5). The fluidization phenomenon is believed to be due to the unraveling of the PEO chains that appear to entangle between adjacent particles during consolidation. The unraveling was directly observed with an atomic force microscope between two BaTiO3 surfaces coated with the same diblock copolymer used for the alumina powder.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1151-2916.2000.tb01435.x
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  • 7
    Electronic Resource
    Electronic Resource
    Ceramic Composites with Three-Dimensional Architectures Designed to Produce a Threshold Strength—II. Mechanical Observations (2005)
    Oxford, UK : Blackwell Science Inc
    Journal of the American Ceramic Society 88 (2005), 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: Finite element modeling and linear elastic fracture mechanics are used to model the residual stresses and failure stress of ceramic composites consisting of polyhedral alumina cores surrounded by thin alumina/mullite layers in residual compression. This type of composite architecture is expected to exhibit isotropic threshold strength behavior, in which the strength of the composite for a particular assumed flaw will be constant and independent of the orientation of tensile loading. The results of the modeling indicate that the strengths of such architectures will be higher than those of laminates of similar architectural dimensions that were previously found to exhibit threshold strength behavior for a particular flaw type. Flexural testing of the polyhedral architectures reveals that failure is dominated by processing defects found at junctions between the polyhedra. Fractography revealed the interaction of these defects with the residual stresses in the compressive layers that separate the polyhedra.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1551-2916.2005.00377.x
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  • 8
    Electronic Resource
    Electronic Resource
    Ceramic Composites with Three-Dimensional Architectures Designed to Produce a Threshold Strength—I. Processing (2005)
    Oxford, UK : Blackwell Science Inc
    Journal of the American Ceramic Society 88 (2005), 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: A processing method was developed to produce a composite architecture that consisted of polyhedra of one material separated from one another by thin layers of a second material. The materials used for this study were selected so that the material separating the polyhedra would develop large compressive stresses during cooling because of differential thermal contraction. This architecture was developed to determine if it could be used to produce a ceramic composite that exhibited an isotropic threshold strength; a threshold strength has been previously demonstrated for periodic laminates containing thin layers in residual compression. To produce the current architecture, spherical alumina agglomerates were produced by suspending aqueous slurry droplets in an upward flow of a hygroscopic liquid; during the suspension period, the water was absorbed from the droplets, thereby consolidating the particles within an agglomerate. The agglomerates were then coated with thin layers of mullite–alumina using methods commonly employed in the pharmaceutical processing industry. The coated agglomerates were then consolidated into compacts by a two-step process in which the agglomerates were first uniaxially pressed at low pressure and then isopressed at high pressure. The uniaxial consolidation introduced a small degree of anisotropy into the composite architecture. Edge-cracking was observed for compressive layers containing 55 vol% mullite, thereby confirming that the appropriate compressive stresses were developed within the architecture.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1551-2916.2005.00239.x
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  • 9
    Electronic Resource
    Electronic Resource
    Diffusion limited crystallization and phase partitioning in ZrO2-metal oxide binary systems (1994)
    Springer
    Journal of sol gel science and technology 2 (1994), S. 317-321 
    Details
    ISSN: 1573-4846
    Keywords: diffusion-limited crystallization ; phase diagrams ; metastability ; ZrO2-metal oxide
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Chemical routes to synthesize inorganics can start with solutions where multiple elements remain well mixed during liquid evaporation, precursor decomposition and crystallization. Because crystallization generally occurs at temperatures where diffusion is very limited, a single phase can crystallize with a greatly extended solid-solution that does not achieve its equilibrium phase assemblage until much higher temperatures where diffusion is no longer constrained. Partitioning at these higher temperatures can lead to unique microstructures such as the nano-composite illustrated here for a metastable Zr(1−x)Al x O2−x/2 (x≤0.57) phase that partitions into a composite containing t-ZrO2 grains and α-Al2O3 plates.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00486263
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  • 10
    Electronic Resource
    Electronic Resource
    Modulated structure of an 800 Å epitactic film of the superconductor Bi2Sr2CaCu2O8 as studied by synchrotron radiation (1991)
    [S.l.] : International Union of Crystallography (IUCr)
    Acta crystallographica 47 (1991), S. 57-59 
    Details
    ISSN: 1600-5724
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: The modulated structure of an 800 Å epitactic thin film of the Bi2Sr2CaCu2O8 superconductor has been determined using synchrotron radiation. The study shows that single-crystal techniques can be applied to very thin oriented films.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0108767390012788
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