Determination of porosity from shrinkage curves during sintering of granular materials

Abstract

This paper investigates the implementation of an analytical model to determine the porosity of a granular material during reactive and nonreactive sintering. A graphical interpretation of this model is proposed to calculate the porosity by comparing the experimental shrinkage curve with the ideal one. For the nonreactive sintering, some examples have been taken from the literature to illustrate the application of this method for two granular materials (alumina and zircon). In the case of reactive sintering, we have used our experiments to study the sintering behavior of magnesium hydroxide. The shrinkage curve was determined by dilatometer and the porosity was measured by helium pycnometer. The comparison revealed that the porosity calculated from the model is fully consistent with the porosity measurements in the both cases.

Flat sheet metakaolin ceramic membrane for water desalination via direct contact membrane distillation

“…This decline simultaneously enhances the flexural strength of the membranes. As expected, the membrane porosity decreased when the sintering temperature increased (Guechi et al 2016;Hubadillah et al 2016cHubadillah et al , 2019dHubadillah et al , 2020Wang et al 2016;Abdulhameed et al 2017aAbdulhameed et al , 2017bMankai et al 2018;Kadiri et al 2020;Li et al 2020b). The micrographs confirm that increasing the sintering temperature decreases the porosity and increases the pore size of the sintered metakaolin-based membrane.…”