超声辅助制备β-磷酸三钙/Mg-Zn-Ca生物复合材料及性能

在生物Mg合金基体中添加β-磷酸三钙（β-TCP）颗粒可以调控其力学性能及腐蚀降解性能，满足人体不同植入部位的服役需求。本研究在机械搅拌铸造的基础上，采用超声方法对Mg基复合材料的熔体进行辅助处理，制备了β-TCP添加量为1%（质量比）、Zn含量为3%（质量比）、Ca含量为0.2%（质量比）的β-TCP/Mg-Zn-Ca可降解生物复合材料，对超声处理制备的β-TCP/Mg-Zn-Ca复合材料的显微组织、力学性能和腐蚀行为与未超声处理制备的β-TCP/Mg-Zn-Ca复合材料进行了对比研究。结果表明：超声处理可以细化β-TCP/Mg-Zn-Ca复合材料的显微组织，有利于β-TCP复合颗粒的均匀分散；β-TCP/Mg-Zn-Ca复合材料在模拟体液环境下的耐蚀性得到提高；其屈服强度、抗拉强度和伸长率分别为211.54 MPa、334.32 MPa和7.28%，与未超声处理的β-TCP/Mg-Zn-Ca复合材料相比，分别提高了8.44%、4.67%和17.99%。

Ultrasonic aided fabrication and properties of β-tricalcium phosphate/Mg-Zn-Ca biocomposites

By introducing β-tricalcium phosphate (β-TCP) particles into the magnesium matrix alloy, the mechanical and corrosion degradation properties of the composite could be adjusted to meet the service requirements of different implantation sites. In this study, on the basis of mechanical stirring casting, the melt of Mg matrix composite was assisted by ultrasonic treatment, and the β-TCP/Mg-Zn-Ca biodegradable composite was prepared with the β-TCP content of 1% (mass ratio), Zn content of 3% (mass ratio) and Ca content of 0.2% (mass ratio). The effects of ultrasonic treatment on the microstructure, mechanical properties and corrosion behavior of the β-TCP/Mg-Zn-Ca composite were analyzed. The results show that the ultrasonic treatment can refine the microstructure and facilitate the uniform dispersion of the β-TCP particles in the matrix alloy. The corrosion resistance of the β-TCP/Mg-Zn-Ca composites is improved after ultrasonic treatment; The yield strength, ultimate tensile strength and elongation of the as-extruded β-TCP/Mg-Zn-Ca composite after ultrasonic treatment are 211.54 MPa, 334.32 MPa, and 7.28%, respectively, which increase by 8.44%, 4.67% and 17.99%, respectively, compared with the unsonicated β-TCP/Mg-Zn-Ca composite.