... strength,hardness and fracture toughness 2.stable 3.supersmooth,low wear rate zirconia rods,zirconia ceramic rod zirconia rods,zirconia ceramic ... § High density§ High strength and fracture toughness§ High hardness and wear resistance§ Low thermal conductivity (20% that of Alumina)§ Good chemical ... °) Coefficient of thermal expansion10-6K-19.6(20-400°) low wear resistant zirconia rods