... conductivity (20% that of alumina)Chemical inertnessResistance to molten metalsIonic electrical conductionWear resistanceHigh fracture toughnessHigh hardnessZirconia ceramic are used in shaft , ... ceramic shaft piston and gear, Zirconia ceramic rod, machinable ceramic rod for industry, ceramic sheet, ceramic seal ring, ceramic ring, zirconia ceramic sheet seal ring disc, wear resistant ceramic disc ...