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  • 1
    Electronic Resource
    Electronic Resource
    Synthesis of Magnesium Aluminate Spinel Platelets from α-Alumina Platelet and Magnesium Sulfate Precursors (2003)
    Westerville, Ohio : American Ceramics Society
    Journal of the American Ceramic Society 86 (2003), 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: Spinel platelets were formed from a powder mixture of 3–5 μm wide and 0.2–0.5 μm thick α-Al2O3 and 1–8 μm (average 3 μm) MgSO4 heated 2 h at 1200°C. The hexagonal platelet shape of the original α-Al2O3 platelet was maintained in the spinel, although their size was slightly increased and their surface roughened. When a mixture of α-Al2O3 platelets and MgO powder was heated 3 h at 1400°C, the spinel formed lost the platelet morphology of the alumina.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1151-2916.2003.tb03589.x
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  • 2
    Electronic Resource
    Electronic Resource
    Synthesis of Al4SiC4 (2003)
    Westerville, Ohio : American Ceramics Society
    Journal of the American Ceramic Society 86 (2003), 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: The conditions necessary for synthesizing Al4SiC4 from mixtures of aluminum, silicon, and carbon and kaolin, aluminum, and carbon, as starting materials, were examined in the present study. The standard Gibbs energy of formation for the thermodynamic reaction SiC(s) + Al4C3(s) = Al4SiC4(s) changed from positive to negative at 1106°C. SiC and Al4C3 formed as intermediate products when the mixture of aluminum, silicon, and carbon was heated in argon gas, and Al4SiC4 then formed by reaction of the SiC and Al4C3 at 〉1200°C. Al4C3, SiO2, Al2O3, SiC, and Al4O4C formed as intermediate products when the mixture of kaolin, aluminum, and carbon was heated under vacuum, and Al4SiC4 formed from a reaction of those intermediate products at 〉1600°C.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1151-2916.2003.tb03414.x
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  • 3
    Electronic Resource
    Electronic Resource
    Characterization of Liquid Exsolved by Remelting Reaction of Belite (2001)
    Westerville, Ohio : American Ceramics Society
    Journal of the American Ceramic Society 84 (2001), 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: We examined the chemistry and structure of the liquid that was exsolved by the remelting reaction of belite. Electron probe microanalysis revealed that the liquid concentrated the impurity components (e.g., Na2O, K2O, Al2O3, and Fe2O3) of the parent belite. Micro-Raman spectroscopy showed the similarity of the spectra of the exsolved liquid and amorphous calcium aluminoferrite solid solution. The transition from the crystalline to the amorphous state of the solid solution was induced by increasing the excitation laser power. Accordingly, the liquid at ambient temperature was most likely in a glassy state. The chemical composition of the liquid, deduced from the above experiments, was ∼81 mass% Ca2AlFeO5 and ∼19 mass% Ca2SiO4. The alkalies, which have never been detectable in crystalline calcium aluminoferrite, were probably necessary for the vitrification of the liquid.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1151-2916.2001.tb00804.x
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  • 4
    Electronic Resource
    Electronic Resource
    Oxidation Protection of MgO–C Refractories by Means of Al8B4C7 (2001)
    Westerville, Ohio : American Ceramics Society
    Journal of the American Ceramic Society 84 (2001), 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: The effect of Al8B4C7 used as an antioxidant in MgO–C refractories and the behavior of Al8B4C7 in CO gas were investigated in the present study. Al8B4C7 was found to react with CO gas, to form Al2O3(s), B2O3(l), and C(s), at temperatures 〉1100°C. The Al2O3 reacts with MgO to form MgAl2O4 near the surface of the material. At the same time, B2O3(l) evaporates and reacts with MgO, to form a liquid phase, at 〉1333°C, the eutectic point between 3MgO·B2O3 and MgO. The coexistence of the liquid and MgAl2O4 makes the protective layer more dense, thus inhibiting oxidation of the refractory. At 〉1333°C, the process apparently is controlled by oxygen diffusion, whereas it is controlled by chemical reaction when the temperature is 〈1333°C.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1151-2916.2001.tb00701.x
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