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  • 1995-1999  (4)
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  • 1
    Electronic Resource
    Electronic Resource
    Mathematical and experimental investigation of the self-propagating high-temperature synthesis (SHS) of TiAl3 and Ni3Al intermetallic compounds (1996)
    Springer
    Journal of materials science 31 (1996), S. 3281-3288 
    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 One-dimensional mathematical modeling was used to describe the self-propagating high-temperature synthesis (SHS) process for preparing TiAl3 and Ni3Al intermetallics. The kinetic parameters (activation energies and pre-exponential factors) for the two compounds were obtained by matching experimental measurement and the numerical solution. The results thus obtained were compared with rate parameters obtained using different methods. The activation energy was 483 and 283 kJ mol−1 for the formation of TiAl3 and Ni3Al, respectively. The temperature profiles calculated using the mathematical model were compared with experimental measurements for both aluminides which indicated reasonable agreement. Fine particle size and moderate preheating increase the SHS rates.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00354680
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    The self-propagating high-temperature synthesis (SHS) of ultrafine high-purity TiC powder from TiO2+Mg+C (1995)
    Springer
    Journal of materials science 30 (1995), S. 2835-2837 
    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 The self-propagating high-temperature synthesis (SHS) method has been applied to the preparation of TiC powder from mixtures of TiO2, Mg, and C. The TiC/MgO product is leached by hydrochloric acid to remove the MgO. The optimum mixing ratio was TiO2∶Mg∶C=1∶2.2∶1.5. The final product TiC had 〉 99.9% purity and relatively uniform particle size of 0.3–0.4 μm.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00349651
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Preparation of nickel-coated alumina composite powder by an aqueous-phase reduction process (1995)
    Springer
    Journal of materials science 30 (1995), S. 3883-3887 
    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 A nickel coating on the surface of alumina particles, used as a reinforcement in metal-ceramic composite materials, substantially improves their wettability by molten metals. Nickel was deposited on alumina particles by reducing nickel ions from a solution under hydrogen pressure in the presence of ammonia as a complexing agent. It was found that the addition of Fe2+ ions and anthraquinone was necessary for forming an adequate nickel coating on the alumina surface. The optimum conditions were the [NH3]/[Ni2+] ratio of 1.6, 2760 kPa hydrogen pressure, 175 °C, and an anthraquinone addition of 0.04 g l−1.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01153950
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Mathematical modeling of fluidized-bed chlorination of rutile (1996)
    Hoboken, NJ : Wiley-Blackwell
    AIChE Journal 42 (1996), S. 3102-3112 
    Details
    ISSN: 0001-1541
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: A mathematical model was formulated to describe the reaction rate and the particle size distribution of solids in a fluidized bed for the chlorination of rutile by a CO/Cl2 mixture. The bubble assemblage model was applied to describe the gas behavior in the bed. The particle-size distribution in the bed was determined by a population balance. Predictions of the model gave satisfactory agreement with experimental results. The effects of important variables such as superficial gas velocity, exchange rate between the phases, and the reaction-rate constant were evaluated.
    Additional Material: 12 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/aic.690421110
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    Paper (German National Licenses)
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