Hydroxyapatite-zirconium dioxide composite bioceramic material and its preparing method

Abstract

The invention relates to a kind of hydroxyl apatite - zirconia compound biology ceramic material and its producing method, belonging to biology medical material producing technological field. The invention makes zirconia as substance central layer, on its upper and lower surfaces, respectively spread mix middle layer of zirconia and hydroxyl apatite mixed as per different proportion, on the most outside spread a surface layer of pure hydroxyl apatite, to form a kind of gradient nappe structure; in steel mould, at pressure of 10 - 30 MPa, dry press to molding, then at high temperature of 1500 - 1600 Deg. C, sinter without pressure, then can get hydroxyl apatite - zirconia compound biology ceramic material. The compound material produced by the method of the invention, its anti-bending strength is 900 - 1100 MPa, its fracture toughness (KIC) is 7 - 10 MPaíñm1 / 2, its roughness is 0.5 - 5.0 micron; the compound material has good biology compatibility, so can meet the requirement of load bearing planting body of different parts of human body.

Description

technical field

[0001] The invention relates to a hydroxyapatite-zirconia composite bioceramic material and a preparation method thereof, belonging to the technical field of preparation of biomedical materials. Background technique

[0002] Hydroxyapatite (HA), which has similar chemical composition and structure to human hard tissue, has good biological activity, but its mechanical properties are poor, low strength, poor toughness, such as bending strength of 50-150MPa, fracture toughness (K 1C ) not exceeding 1.0MPa·m 1 / 2 , while the human skeleton is at 2~12MPa·m 1 / 2 . Therefore, as an artificial implant, that is, a bone replacement material, the reliability of its use is poor.

[0003] Zirconia (ZrO 2 ), has good wear resistance and biocorrosion resistance. Therefore, its mechanical properties are superior to other ceramic materials. According to test reports, doped with 3mol% Y 2 o 3 ZrO 2 Ceramic, that is, 3mol% Y 2 o 3 Partially stabilized ZrO 2 The flexu...