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  • Digitale Medien  (37)
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  • Digitale Medien  (37)
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  • 1
    Digitale Medien
    Digitale Medien
    Influence of Short-Chain Carboxylic Acids on the Mechanical Properties and Structure of Coagulated Alumina Suspensions (2005)
    Oxford, UK : Blackwell Science Inc
    Journal of the American Ceramic Society 88 (2005), S. 0 
    Details
    ISSN: 1551-2916
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Maschinenbau , Physik
    Notizen: Three different short-chained carboxylic acids, formic, acetic, and propionic acid, were compared as additives to increase the green strength of wet particle networks produced with the direct coagulation casting process, which allows the internal coagulation of a suspension. Small acid additions do not alter the favorable low viscosity of the stabilized slurry, and yet increase the compressive strength of wet coagulated bodies. The strengthening effect increases with increasing chain length of the carboxylic acid. The maximum effect was observed upon addition of propionic acid (0.3 wt% to alumina), which resulted in a sixfold increase in compressive strength of wet coagulated bodies compared with that without propionic acid.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1111/j.1551-2916.2005.00470.x
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  • 2
    Digitale Medien
    Digitale Medien
    Mechanics and Microstructures of Concentrated Particle Gels (2005)
    Oxford, UK : Blackwell Science Inc
    Journal of the American Ceramic Society 88 (2005), S. 0 
    Details
    ISSN: 1551-2916
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Maschinenbau , Physik
    Notizen: It is often assumed that the viscoelastic properties of dense colloids are determined by the colloid volume fraction, the interaction potential, as well as the particle size distribution and shape. The dependence of the viscoelastic behavior of particle suspensions and gels on these parameters has been widely studied, and is well understood in many cases. In contrast, our knowledge on the influence of microstructure on mechanical and rheological properties, in particular for high solid loading suspensions as used in ceramic processing, is much less developed. This aspect has been the focus of recent experiments, which show that small changes in microstructure can have dramatic effects on the mechanics and dynamics of concentrated colloidal gels. In this article, we attempt to give an overview of the influence of microstructure on the mechanical and rheological properties of colloidal systems. Particular attention is given to colloidal particle gels at high volume fractions.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1111/j.1551-2916.2005.00622.x
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  • 3
    Digitale Medien
    Digitale Medien
    CeO2−CoO Phase Diagram (2003)
    Westerville, Ohio : American Ceramics Society
    Journal of the American Ceramic Society 86 (2003), S. 0 
    Details
    ISSN: 1551-2916
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Maschinenbau , Physik
    Notizen: Phase equilibria in the CeO2−CoO system at temperatures above 1500°C were investigated. The microstructures and the phase compositions of the DTA (differential thermal analysis) samples and the quenched solid pellets were analyzed using SEM (scanning electron microscope), EDX (energy dispersive X-ray), and WDX (wavelength dispersive X-ray). A eutectic reaction was found at 1645 ± 5°C. The eutectic point was calculated to be at 82 ± 1.5 mol% CoO. The eutectic phases were the CeO2-rich phase (containing 〈5 mol% CoO) and the CoO-rich phase (containing ∼0.5 mol% CeO2). At 1580°C, the solubility of CoO in CeO2 was ∼3 mol%.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1111/j.1151-2916.2003.tb03515.x
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  • 4
    Digitale Medien
    Digitale Medien
    Chemical Aspects of Direct Coagulation Casting of Alumina Suspensions (2004)
    Westerville, Ohio : American Ceramics Society
    Journal of the American Ceramic Society 87 (2004), S. 0 
    Details
    ISSN: 1551-2916
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Maschinenbau , Physik
    Notizen: This work presents a detailed description of urea decomposition during direct coagulation processing of alumina suspensions. We report on the chemical equilibria involved in the decomposition of urea in an aqueous environment with and without alumina particles. The model uses the logarithm of the concentrations as variables to ensure fast convergence and nonnegativity of the solutions, and is able to give a semiquantitative description of the experimentally observed development of pH and ionic strength (specific conductivity) during the decomposition of urea in a 30 vol% solid loading alumina suspension. Assuming local equilibrium, and a homogeneous distribution of the catalyst urease and the evolving educts, the results show an increasing solubility of CO2 with increasing pH. As a consequence the production of gaseous CO2 during the urea decomposition (direct coagulation casting (DCC) process), shifting the pH from 4 to 9 occurs only when a strong buffer is present at low and medium pH. This is advantageous for the preparation of defect-poor ceramic green bodies using this internal gellation reaction in the DCC process.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1111/j.1551-2916.2004.01530.x
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  • 5
    Digitale Medien
    Digitale Medien
    Micropatterned Ceramics by Casting into Polymer Molds (2002)
    Westerville, Ohio : American Ceramics Society
    Journal of the American Ceramic Society 85 (2002), S. 0 
    Details
    ISSN: 1551-2916
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Maschinenbau , Physik
    Notizen: Patterned ceramic surfaces with a feature resolution in the micrometer range are generated by casting aqueous suspensions of high solids loadings onto nonporous polymer molds. The suspensions are solidified by evaporation of the solvent. High-quality line patterns with an aspect ratio of 1 and a pitch of 3 μm were fabricated for alumina, zirconia, cerium gadolinium oxide, and tin oxide powders using molds of poly(dimethylsiloxane). In addition, alumina parts were also created with molds made of a polyolefin (high-density polyethylene), a fluoropolymer (poly(tetrafluoroethylene-co-hexafluoropropylene)), and an epoxy system.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1111/j.1151-2916.2002.tb00372.x
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  • 6
    Digitale Medien
    Digitale Medien
    Experimental Phase Diagram Study and Thermodynamic Optimization of the Ag-Bi-O System (1999)
    Westerville, Ohio : American Ceramics Society
    Journal of the American Ceramic Society 82 (1999), S. 0 
    Details
    ISSN: 1551-2916
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Maschinenbau , Physik
    Notizen: The Ag-Bi-O system has been experimentally studied using differential thermal analysis (DTA) and scanning electron microscopy (SEM) with energy dispersive X-ray spectroscopy (EDX), and thermodynamically optimized. The temperatures of the eutectic, monotectic, and Bi2O3 allotropic transformations have been measured in N2, in air, and in O2 by DTA. There are no ternary phases stable at ambient pressure. Presently measured transformation temperatures have been combined with existing oxygen activity measurements in the metal liquid to optimize thermodynamic parameters describing the liquid phase. The resulting fit is excellent. EDX measurements of the composition in the oxide liquid have a rather low precision but confirm the thermodynamic optimization. However, some uncertainties remain concerning the liquid composition at the eutectic transformation and the shape of the miscibility gap at higher temperatures.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1111/j.1151-2916.1999.tb01821.x
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  • 7
    Digitale Medien
    Digitale Medien
    Thermodynamic Assessment of the Bismuth–Strontium–Oxygen Oxide System (1997)
    Westerville, Ohio : American Ceramics Society
    Journal of the American Ceramic Society 80 (1997), S. 0 
    Details
    ISSN: 1551-2916
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Maschinenbau , Physik
    Notizen: The experimental data on the oxide portion of the Bi–Sr–O system have been reviewed, and an optimized thermodynamic description is presented. There are at least seven stable ternary oxide phases, two of which show considerable solid-solution ranges. At least two phases—δ-Bi2O3 and the rhombohedral β-phase—are good oxygen-ion conductors. Most of the phases are confined to the Bi2O3-SrO line at ambient oxygen partial pressure; however, in the SrO-rich portion, there are at least two phases with oxygen in excess, i.e., with bismuth in the oxidation state Bi5+ instead of the usual Bi3+. There are rather large differences between different experimental data sets; nevertheless, a reasonably consistent set of data can be chosen for the optimization.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1111/j.1151-2916.1997.tb02950.x
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  • 8
    Digitale Medien
    Digitale Medien
    Thermodynamic Assessment of the Strontium–Copper–Oxygen System (1997)
    Westerville, Ohio : American Ceramics Society
    Journal of the American Ceramic Society 80 (1997), S. 0 
    Details
    ISSN: 1551-2916
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Maschinenbau , Physik
    Notizen: The phase diagram and thermodynamic data on the Sr–Cu–O system at a total pressure of 105 Pa (1 bar) have been reviewed and assessed. Gibbs energy functions for the ternary oxides Sr2CuO3, SrCuO2, Sr14Cu24O41, SrCu2O2, and the liquid phase have been optimized, and a consistent thermodynamic description is presented. Calculated SrOCuOx phase diagrams in air and in 1.01 ×105 Pa (1.01 bar) O2, the oxygen potential diagram, and various thermodynamic properties are shown and compared to experimental data.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1111/j.1151-2916.1997.tb02864.x
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  • 9
    Digitale Medien
    Digitale Medien
    Direct Coagulation Casting of Alumina Suspensions Using Jack Bean as a Urease Source (2002)
    Westerville, Ohio : American Ceramics Society
    Journal of the American Ceramic Society 85 (2002), S. 0 
    Details
    ISSN: 1551-2916
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Maschinenbau , Physik
    Notizen: This paper reports on the use of Jack bean meal as an alternative source of urease for direct coagulation casting (DCC) processes. Al2O3 suspensions were prepared to compare the effect of Jack bean meal and pure urease on the hydrolysis of urea, the slurry coagulation rate, and the mechanical properties of consolidated bodies. Results indicate that the Jack bean meal is a promising economic alternative for the consolidation of ceramic parts, mainly because of its lower susceptibility to enzyme deactivation when exposed to room temperature and relatively humid environments.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1111/j.1151-2916.2002.tb00337.x
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  • 10
    Digitale Medien
    Digitale Medien
    Thermodynamic Optimization of the Silver—Bismuth—Strontium—Calcium—Copper—Oxygen (Ag-Bi-Sr-Ca-Cu-O) System (2000)
    Westerville, Ohio : American Ceramics Society
    Journal of the American Ceramic Society 83 (2000), S. 0 
    Details
    ISSN: 1551-2916
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Maschinenbau , Physik
    Notizen: Experimental data on the phase equilibria between the high-critical-temperature (high-Tc) superconducting compound 2212 and silver have been reviewed and assessed. Using these data, the interaction parameter of the Gibbs energy function of the liquid phase was optimized via the CALPHAD method. The calculation yields very good agreement with the experiment. This work is the final step in the optimization of the Ag-Bi-Sr-Ca-Cu-O system.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1111/j.1151-2916.2000.tb01293.x
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