* Y2O3+ZrO2>(=)99.5%, Density: 6.0-6.09g/cm3; Hardness: 89 Elastic modulus: 200GPa Thermal Expasion coff: 9.6 10*10-6/k Tensile strength: 1000-1200MPa Bending Toughness: 12-14MPam1/2 * Al2O3: 75-99%, Density: 3.2-3.93/cm Hardness: 85-91 Elastic modulus: 350-400GPa Tensile strength: 200-400MPa Bending Toughness: 2.0-5MPam1/2 * Al2O3: 68-72%, Density: 3 25g/cm3 Hardness: 85-88 Elastic modulus: 200GPa Tensile strength: 300-500MPa Bending Toughness: 5-7MPam1/2 * ZTM: ZrO2: 15-35%, Density: 3.3g/cm3 Hardness: 83-88 Elastic modulus: 200GPa Tensile strength: 450-700MPa Bending Toughness: 6-8MPam1/2