Zirconia ceramics is with higher density , higher hardness and wear resistance characteristics etc, especially its bending strength and fracture toughness are very much higher than other non-metallic materials, the service life is **5 times of alumina ceramics .Zirconia ceramics is widely used in various industries,the chemical prqperties are as follows :

• Bending Strength (Mpa )                                    **0
• Fracture toughness (Mpa. m3 / 2 )                     6 - 8
• Density (g/cm3 )                                                 5.8 - 6.0
• Thermal conductivity Coefficient (W/m.k)            2.5 - 2.9
• Mons' hardness scale                                         8.5