Different weight percentage were selected from plastic component pyramid (Binder,plastizier,lubricant); to study their effect on physical and dielectric properties for porcelain body prepared from local clays [40wt% Kaolin Dukhla D<200μ, 25wt% Arthuma sand glass D<63μm].
First step was clay washing to remove soluble unrequired materials, followed by drying, milling then sieving to select the required particle size.
Three mixture from pyramid were prepared by using (70,75,80)% of polyvinyl batyral, (20,15,10)% butyl pathalte, and 10% paraffin wax pastillated. These mixture were solved by using xylozul analyte solvnt at 90oC by indirect heating process.
After adding 5% from prepared plastic component pyramid mixture to porcelain body, followed by mixing, then by method looks like Hot ISO-static press, the samples were formed. The dried samples were heat treated at different firing temperature (1250, 1300, 1350)oC for 2hr and at rating 2oCmin.
Dielectric characterization (Dielectric constant, dielectric loss index) and physical parameters (linear and volume shrinkage) were measured.
The conclusion behind this study that adding 5% of plastic component pyramid mixture, with respect to their preparation condition, to porcelain body, then fired at 1300oC gives the recommended data for dielectric characteristic with 20% shrinkaage, and as percent of binder increase corresponded with increase of dielectric and shrinkage properties.