Microstructure and properties of biodegradable co-continuous(HA+β-TCP)/Zn−3Sn composite fabricated by vacuum casting-infiltration technique

The co-continuous(HA+β-TCP)/Zn−3Sn composite was fabricated via vacuum casting-infiltration method.The microstructure,mechanical properties,corrosion behaviors,and hemolysis ratio of the composite were studied by scanning electron microscope,X-ray diffractometer,mechanical testing,electrochemical test,immersion test,and ultraviolet spectrophotometry.The results indicate that Zn−3Sn alloy infiltrated into porous HA+β-TCP scaffold,which resulted in the formation of a compact(HA+β-TCP)/Zn−3Sn co-continuous composite,without any reaction layer between the Zn−3Sn alloy and the HA+β-TCP scaffold.The compressive strength of the composite was equal to about 3/4 that of Zn−3Sn alloy bulk.The corrosion rate of composite in simulated body fluid solution was slightly higher than that of Zn−3Sn alloy bulk.The main corrosion product on the composite surface was Zn(OH)2.The hemolysis rate of the composite was lower than that of Zn–3Sn alloy bulk and exhibited superior blood compatibility.

真空吸铸法制备(HA+β-TCP)/Mg-3Zn相互渗透复合材料的组织和性能

采用真空吸铸法将Mg-3Zn合金渗透到HA含量不同的多孔HA+β-TCP中制备了生物医用相互渗透(HA+β-TCP)/Mg-3Zn复合材料,研究了复合材料的显微组织、力学性能和腐蚀行为。结果表明,熔融的Mg-3Zn合金不仅渗入到多孔HA+β-TCP骨架的孔隙里,也渗入到筋里,形成了致密的复合材料。Mg-3Zn合金与HA+β-TCP骨架界面结合良好,未出现反应层。HA含量不同的(HA+β-TCP)/Mg-3Zn复合材料的抗压缩强度为115～196 MPa,是多孔HA+β-TCP骨架的350倍以上,相当于Mg-3Zn块体合金抗压强度的44%～75%;复合材料的耐腐蚀性能优于Mg-3Zn块体合金,且力学性能和腐蚀行为均可以通过调节HA/β-TCP的比例进行控制。