The aim of this work is to develop a mathematical model to study the mechanism of elimination of total porosity as a function of soaking time using the Navier-Stokes. Then, parameters of the model such as kinetic constant and apparent activation energy are calculated on the basis of experimental data for a standard porcelain stoneware tile composition. the theoretical data calculated from the model are in good agreement with the experimental data. Using the model developed, it is possible to estimate the best soaking time to obtain minimum total porosity at a given firing temperature. the effects of nepheline on sintering process of porcelain stoneware tile is investigated. It was found that when the nepheline syenite content of the starting mix was increased to 10%, the constant Kp of the kinetic equation also increased. The results showed that addition of nepheline to composition of porcelain stoneware bodies was influenced remarkably suitable soaking time to obtain the minimum total porosity and increased shrinkage and bulk density while total and closed porosity fall down.
A kinetic study on the development of porosity in porcelain stoneware tile sintering / S.H. Jazayeri; A. Salem; G. Timellini; E. Rastelli. - In: BOLETIN DE LA SOCIEDAD ESPANOLA DE CERAMICA Y VIDRIO. - ISSN 0366-3175. - STAMPA. - 46 (1):(2007), pp. 1-5.
A kinetic study on the development of porosity in porcelain stoneware tile sintering
TIMELLINI, GIORGIO;
2007
Abstract
The aim of this work is to develop a mathematical model to study the mechanism of elimination of total porosity as a function of soaking time using the Navier-Stokes. Then, parameters of the model such as kinetic constant and apparent activation energy are calculated on the basis of experimental data for a standard porcelain stoneware tile composition. the theoretical data calculated from the model are in good agreement with the experimental data. Using the model developed, it is possible to estimate the best soaking time to obtain minimum total porosity at a given firing temperature. the effects of nepheline on sintering process of porcelain stoneware tile is investigated. It was found that when the nepheline syenite content of the starting mix was increased to 10%, the constant Kp of the kinetic equation also increased. The results showed that addition of nepheline to composition of porcelain stoneware bodies was influenced remarkably suitable soaking time to obtain the minimum total porosity and increased shrinkage and bulk density while total and closed porosity fall down.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
