钴对凝胶注模成形医用植入钛合金材料的影响

EFFECT OF COBALT ON TITANIUM ALLOY IMPLANTS FOR MEDICAL APPLICATION BY GELCASTING

本文采用凝胶注模成形工艺,用钴包覆钛粉制备多孔钛合金植入材料。研究了钴对成形工艺中浆料的粘度、孔隙率以及烧结体的抗压强度的影响,预混液中有机单体的浓度、单体（AM）/交联剂（MBAM）的比例对坯体的强度的影响。通过改变烧结温度和固相含量,可以实现多孔钛钴合金的孔隙率和抗压强度分别在29%~58%、68~378 MPa范围内调节,采用含钴8%的钴包覆钛粉以33%的固相含量制备坯体,在1 130℃保温2 h制备的多孔钛合金材料,孔隙率为45.6%、抗压强度为227 MPa、抗弯强度为213 MPa、弹性模量为15.8 GPa,力学性能与自然骨接近,适宜做自然骨替代材料。

In this paper,porous titanium-cobalt alloy implants were prepared by gelcasting with cobalt-coated titanium powder.The effect of cobalt on the viscosity of slurry,total porosity and compressive strength of porous titanium-cobalt alloy in gelcasting process and the effect of monomer concentration,AM/MBAM ratio on the strength of green body in premix solution were investigated.The total prosity and compressive strength can be adjusted within the range of 29%~58% and 68~378 MPa respectivdy by changing the sintering temperature and solid loading retio.The porous titanium-cobalt alloy with 45.6% porosity,227 MPa compressive strength,flexural 213 MPa strength and 15.8 GPa elastic modulus,prepared with 8% cobalt-coated titanium powder 33% solid loading and sintered at 1 130℃ for hrs,was suitable for medical applications.