Porous ceramics made by burning out a pore-former during the sintering process were investigated by stepwise isothermal dilatometry (SID), x-ray diffraction (XRD) phase identification, scanning electron microscopy (SEM), and mechanical-property analysis. SID data obtained by the Makipirtti-Meng method was analyzed and was found to fit well with data on shrinkage obtained by means of the rate equation proposed for use with this method. Kinetic parameters were evaluated and it was established that sintering takes place through two main mechanisms. These mechanisms are related to the generation and sintering of oxidation products and have activation energies of 55.4 and 325.4 kJ/mole. The sintering temperature greatly affects such properties of sintered specimens as open porosity and ultimate flexural strength. The results obtained in the investigation were well-supported by microstructural analysis of the sintered specimens.
Refractories and Industrial Ceramics – Springer Journals
Published: Apr 22, 2015
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