An indirect thermodynamic model developed for initial stage sintering of an alumina compacts by using porosity measurements View Full Text


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Article Info

DATE

2011-10-11

AUTHORS

Y. Sarıkaya, M. Önal, K. Ada

ABSTRACT

The specific micro- and mesopore volumes (V) of alumina compacts fired between 900 and 1250 °C for 2 h were determined from nitrogen adsorption/desorption data. The V value was taken as a sintering equilibrium parameter. An arbitrary sintering equilibrium constant (Ka) was estimated for each firing temperature by assuming Ka = (Vi − V)/V, where Vi is the largest value at 900 °C before sintering. Also, an arbitrary Gibbs energy (ΔGa°) of sintering was calculated for each temperature using the Ka value. The graph of ln Ka versus 1/T and ΔGa° versus T were plotted, and the real enthalpy (ΔH°) and the real entropy (ΔS°) of sintering were calculated from the slopes of the obtained straight lines, respectively. On the contrary, real ΔG° and K values were calculated using the real ΔH° and ΔS° values in the ΔG° = −RT lnK = 165814 − 124.7T relation in SI units. More... »

PAGES

419-423

References to SciGraph publications

  • 2006-06-01. The Effect of Heating on the Surface Area, Porosity and Surface Acidity of a Bentonite in CLAYS AND CLAY MINERALS
  • 2010-01-05. Thermal analysis of a white calcium bentonite in JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
  • 2008-09-19. A model developed for acid dissolution thermodynamics of a Turkish bentonite in JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
  • 2007-07-25. Thermal deformation thermodynamics of a smectite mineral in JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
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    DOI

    http://dx.doi.org/10.1007/s10973-011-1922-x

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