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本实验主要研究HA及β-TCP添加对Mg-Zn-Ca合金组织及模拟体液环境下的腐蚀特性影响。采用剪切搅拌铸造方式制备了2HA(2β-TCP)/Mg-3Zn-0.5Ca复合材料,并对两种复合材料的显微组织及腐蚀特性进行了测试与对比分析。研究结果表明:添加β-TCP的复合材料相对于添加HA的复合材料晶粒细化程度高,原因为β-TCP与镁的错配度小于HA与镁的错配度,使β-TCP成为更有效的形核基底;添加β-TCP复合材料的腐蚀电位稍高于添加HA复合材料的腐蚀电位;在模拟体液的浸泡实验中,添加β-TCP的镁基复合材料在前期的腐蚀速率低于同含量HA的镁基复合材料,但随浸泡时间的延长,添加HA复合材料形成的保护层比添加β-TCP复合材料的更均匀致密,复合材料的失重更低。
This experiment mainly studied the effects of HA and β-TCP on the corrosion characteristics of Mg-Zn-Ca alloy and simulated body fluid environment. 2HA (2β-TCP) /Mg-3Zn-0.5Ca composite was prepared by shear mixing casting method, and the microstructure and corrosion properties of the two composites were tested and compared. The results show that the composite with β-TCP has a higher degree of grain refinement than the HA-added composite because the mismatch between β-TCP and magnesium is less than the mismatch between HA and magnesium, making β-TCP More effective nucleation substrate; corrosion potential of β-TCP composites added slightly higher than that of HA composites; in simulated somatic fluid immersion experiments, the corrosion rate of β-TCP composites added in the early stage was low However, with the increase of immersion time, the protective layer formed by adding HA composite material is more uniform and compact than that of adding β-TCP composite material, and the composite material has lower weight loss.