This research includes the study of the effect of zirconia (ZrO2) addition
in a different weight percentages (5,10,15,20)% to porcelain samples formed
from (Duekhla Kaolin, Ardima Sand, Feldspar Potash and Calcium
Carbonate). We studied effect of zirconia addition on some physical properties
as (Linear shrinkage, bulk density, apparent porosity and water absorption)
and mechanical properties as (Vickers hardness and indirect tensile strength).
The results shown that the zirconia addition in a percentage not increase
(10%) have been enhanced the physical and mechanical properties of
porcelain samples especially in indirect tensile strength.