The effect of Pb on the melting of the 2201 phase was studied by DTA and XRD. The results indicate that as the mole ratio of Pb/(Pb+Bi) is up to 20%, the tetragonal 2201 phase will transform into the orthorhombic 2201...The effect of Pb on the melting of the 2201 phase was studied by DTA and XRD. The results indicate that as the mole ratio of Pb/(Pb+Bi) is up to 20%, the tetragonal 2201 phase will transform into the orthorhombic 2201 and that the melting point Tm of the tetragonal 2201 decreases with increasing Pb-content, however, Tm of the orthorhombic 2201 remains 883°C.展开更多
Considering the compatibility between degradation and bioactivity of magnesium-based implants for bone repair, micro-arc oxidation is used to modify the magnesium alloy surface in aqueous electrolytes, allowing stront...Considering the compatibility between degradation and bioactivity of magnesium-based implants for bone repair, micro-arc oxidation is used to modify the magnesium alloy surface in aqueous electrolytes, allowing strontium, calcium, and phosphorus to be incorporated into the coating. The thickness, composition, morphology and phase of this Sr-Ca-P containing coating are characterized by scanning electron microscopy equipped with energy dispersive X-ray spectrometer and X-ray diffraction. The in vitro and in vivo degradation of the coating is evaluated by immersion test, electrochemical test and implantation test. Moreover, the cytocompatibility is tested with osteoblast cell according to ISO 10993. The results show that St, Ca and P elements are incorporated into the oxide coating, and a refined structure with tiny discharging micro-pores is observed on the surface of the coating. The Sr-Ca-P coating possesses a better corrosion resistance in vitro and retards the degradation in vivo. Such coating is expected to have significant medical applications on orthopedic implants and bone repair materials.展开更多
文摘The effect of Pb on the melting of the 2201 phase was studied by DTA and XRD. The results indicate that as the mole ratio of Pb/(Pb+Bi) is up to 20%, the tetragonal 2201 phase will transform into the orthorhombic 2201 and that the melting point Tm of the tetragonal 2201 decreases with increasing Pb-content, however, Tm of the orthorhombic 2201 remains 883°C.
基金financially supported by the National High Technology Research and Development Program of China (No. 2015AA033701)the Chinese Academy of Sciences-Croucher Founding Scheme for Joint Laboratories (Ref. CAS 14303)Foundation of Jiangsu Collaborative Innovation Center of Biomedical Functional Materials
文摘Considering the compatibility between degradation and bioactivity of magnesium-based implants for bone repair, micro-arc oxidation is used to modify the magnesium alloy surface in aqueous electrolytes, allowing strontium, calcium, and phosphorus to be incorporated into the coating. The thickness, composition, morphology and phase of this Sr-Ca-P containing coating are characterized by scanning electron microscopy equipped with energy dispersive X-ray spectrometer and X-ray diffraction. The in vitro and in vivo degradation of the coating is evaluated by immersion test, electrochemical test and implantation test. Moreover, the cytocompatibility is tested with osteoblast cell according to ISO 10993. The results show that St, Ca and P elements are incorporated into the oxide coating, and a refined structure with tiny discharging micro-pores is observed on the surface of the coating. The Sr-Ca-P coating possesses a better corrosion resistance in vitro and retards the degradation in vivo. Such coating is expected to have significant medical applications on orthopedic implants and bone repair materials.
