Ceramics-Silikáty 54, (3) 248 - 252 (2010) |
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SINTERING BEHAVIOR AND KINETIC EVALUATION OF HYDROXYAPATITE BIO-CERAMICS FROM BOVINE BONE |
Xuebin Zhang 1, Yunfei Ding 1, Songlin Wang 2,
Jie Xu 1,
Yi Feng 1 |
1 School of Materials Science & Engineering, Hefei University of Technology, Hefei 230009, P.R. China
2 Tongling University, Tongling 244000, P.R. China
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Keywords: Hydroxyapatite, Bio-ceramics, Bovine bone, Sintering kinetics |
The Sintering behavior and kinetic evaluation of the bio-ceramics from bovine bone are investigated by stepwise isothermal
dilatometry (SID), X-ray diffraction (XRD) and scanning electron microscope (SEM). The isothermal shrinkage data
obtained from SID could be well analyzed to get kinetic parameters according to the empirical rate equation developed by
Makipirtti-Meng, dY/dt = nk(T)Y(1-Y)[Y/(1-Y)]1/n, where Y is the fractional volume shrinkage during sintering process and
n a dimensionless exponent. The apparent activation energy ∆E values obtained for 1000-1100°C and 1100-1250°C are
84.1 and 52.8 kJ/mol, respectively. Correspondingly, the exponent n that can be served to reveal the morphology changing
during the sintering process are also much different in the two temperature ranges, which is well consistent with the SEM
observation. |
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