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Authors: VALENTINA R. DEJEU, BARABÁS RÉKA, POP ALEXANDRU, BOGYA ERZSÉBET SÁRA, PAUL ŞERBAN AGACHI.
In the paper are presented the theoretical and experimental results concerning the influence of pH and temperature over the rate of the transformation: beta-whitlockite (beta-tricalcium phosphate) in hydroxyapatite (HAP). From the data of the kinetic studies were calculated the values of the rate constants and activation energies at pH = 8.5 – 12. Based on the obtained values for the activation energies it has been established that the process of transformation of beta-whitlockite in HAP could be described using a combined macrokinetic mechanism: transfer – mass transformation. The mathematical of the process has been elaborated and the numerical values of the constants from the mathematical model were determined. Based on the proposed model process simulations were made and the results show that the obtained values fit well with the experimental data, which confirms the model validation
Keywords: hydroxyapatite, macrokinetic mechanism, mathematical model
