An indirect thermodynamic model developed for initial stage sintering of an alumina compacts by using porosity measurements
Yükleniyor...
Tarih
2012
Yazarlar
Dergi Başlığı
Dergi ISSN
Cilt Başlığı
Yayıncı
Springer
Erişim Hakkı
info:eu-repo/semantics/closedAccess
Özet
The specific micro- and mesopore volumes (V) of alumina compacts fired between 900 and 1250 A degrees 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 (K (a)) was estimated for each firing temperature by assuming K (a) = (V (i) - V)/V, where V (i) is the largest value at 900 A degrees C before sintering. Also, an arbitrary Gibbs energy (Delta G (a) A degrees) of sintering was calculated for each temperature using the K (a) value. The graph of ln K (a) versus 1/T and Delta G (a) A degrees versus T were plotted, and the real enthalpy (Delta HA degrees) and the real entropy (Delta SA degrees) of sintering were calculated from the slopes of the obtained straight lines, respectively. On the contrary, real Delta GA degrees and K values were calculated using the real Delta HA degrees and Delta SA degrees values in the Delta GA degrees = -RT lnK = 165814 - 124.7T relation in SI units.
Açıklama
Onal, Muserref/0000-0002-1540-8389
Anahtar Kelimeler
Adsorption, Alumina, Porosity, Sintering thermodynamics
Kaynak
Journal Of Thermal Analysis And Calorimetry
WoS Q Değeri
Q2
Scopus Q Değeri
Q1
Cilt
107
Sayı
2
Künye
closedAccess
