الفهرس | Only 14 pages are availabe for public view |
Abstract This thesis studies the different methods of analysis used in determining the kinetics and mechanisms of three different salts of use in the ceramic industry. Non-isothermal analysis was carried out for sodium borates (borax), basic zinc carbonate and basic cobalt carbonate. Four different methods of analysis has been performed to determine the reaction mechanism and calculating the values of activation energy. The results showed that coats-redfern method gives more reliability results and it was possible to determine the controlling mechanism as well. Otherwise flynn-wall-ozawa method gives the values of activation energy higher than the figures obtained by other methods. The values obtained by Kissinger and linear regression methods are closed to that obtained by Coats-Redfern method. The reaction mechanisms have ranged from chemical reaction controlled mechanism, diffusion controlled mechanism and Erofeev model with formation of nuclei followed by grain growth |