ZrO2 ceramics are bioinert ceramics with high fracture toughness, high fracture strength and low elastic modulus. Pure zirconia has three isoforms and can undergo crystal transformation (phase transition) under certain conditions. Under the action of external force, the process of t to m phase transformation needs to absorb higher energy, relax the stress at the crack tip, increase the crack diffusion resistance and toughen, so it has very high fracture toughness, higher fracture toughness and wear resistance than alumina. It is beneficial to reduce implant size and achieve low friction and wear, which can be used to manufacture tooth roots, bones, femoral joints, composite ceramic artificial bones, valves, etc.
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