Evaluation of Biomedical Ti/ZrO2 Joint Brazed with Pure Au Filler: Microstructure and Mechanical Properties
Evaluation of Biomedical Ti/ZrO2 Joint Brazed with Pure Au Filler: Microstructure and Mechanical Properties
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DOI：
10.3390/met10040526
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发表时间：
2020-04
期刊：
影响因子：
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通讯作者：
Y. Lei;H. Bian;W. Fu;Xiaoguo Song;Jicai Feng;W. Long;H. Niu
中科院分区：
文献类型：
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作者：
Y. Lei;H. Bian;W. Fu;Xiaoguo Song;Jicai Feng;W. Long;H. Niu
氧化钛(ZrO2)陶瓷在生物医学领域有着广泛的应用。本研究的目的是在植入式医疗产品中使用生物相容的Au填充剂实现钛/二氧化锆可靠的钎焊接头。采用扫描电子显微镜(SEM)、能谱仪(EDS)和X射线衍射仪(X射线衍射仪)研究了钎焊温度和保温时间对钛/金/氧化锆接头界面组织和力学性能的影响。结果表明，钛/Au/ZrO2接头的典型界面组织为：钛/Ti3Au层/TiAu层/TiAu2层/TiAu4层/TiO2层/ZrO2陶瓷。随着钎焊温度的升高或保温时间的延长，Ti3Au+TiAu+TiAu2层的厚度逐渐增加。观察到TiO层的生长，促进了钎料与ZrO2陶瓷的冶金结合。当温度为1150℃，时间为10min时，复合材料的最佳剪切强度为~35.0 Mpa。扫描电子显微镜分析表明，裂纹沿TiAu2和TiAu4反应层的界面萌生和扩展。
Titanium and zirconia (ZrO2) ceramics are widely used in biomedical fields. This study aims to achieve reliable brazed joints of titanium/ZrO2 using biocompatible Au filler for implantable medical products. The effects of brazing temperature and holding time on the interfacial microstructures and mechanical properties of titanium/Au/ZrO2 joints were fully investigated by scanning electron microscopy (SEM), energy-dispersive spectrometry (EDS) and X-ray diffraction (XRD). The results indicated that the typical interfacial microstructure of the titanium/Au/ZrO2 joint was titanium/Ti3Au layer/TiAu layer/TiAu2 layer/TiAu4 layer/TiO layer/ZrO2 ceramic. With an increasing brazing temperature or holding time, the thickness of the Ti3Au + TiAu + TiAu2 layer increased gradually. The growth of the TiO layer was observed, which promoted metallurgical bonding between the filler metal and ZrO2 ceramic. The optimal shear strength of ~35.0 MPa was obtained at 1150 °C for 10 min. SEM characterization revealed that cracks initiated and propagated along the interface of TiAu2 and TiAu4 reaction layers.