Al2O3/Ti生物相容连接接头微观组织及力学性能

Microstructure and mechanical property of Al2O3/Ti joint with biocompatibility

文中对Al2O3陶瓷和金属Ti表面磁控溅射Mo和Ti金属层,以纯Au箔钎料,研究连接工艺及Ti金属化层厚度对连接接头微观组织和力学性能的影响.结果表明,焊缝主要由Au钎料和(Au,Mo)ss构成,(Au,Mo)ss中含有少量(Ti,Mo)ss和TixAuy金属间化合物.另外,在Al2O3/钎料界面处及焊缝中存在少量呈条状分布的TiO2和TixAly金属间化合物.连接工艺及Ti金属化层厚度主要影响各物相的数量及分布状态,通过影响焊缝中固溶体的分布均匀性及金属间化合物的数量而影响接头抗剪强度.当连接温度为1080℃、保温时间为5min、Ti金属化层厚度为0.2μm时,接头的抗剪强度达到最大值138MPa.

In this paper,the experimental materials of Al2O3 ceramic and pure Ti metal were modified by metals Mo and Ti by magnetron sputtering and brazed using Au filling metal.The effect of joining process and Ti metallizing layer thickness on the microstructure and mechanical property of the joints was investigated.The results show that the microstructure of the Al2O3/Ti joint mainly consisted of Au braze and (Au,Mo)ss.There were a few (Ti,Mo)ss and TixAuy intermetallic compounds (IMCs) among the (Au,Mo)ss.A few TiO2 and TixAuy IMCs were also observed at the Al2O3/braze interface and in the weld.The kind of phases in the weld was free from influence of bonding temperature,holding time and Ti metallizing layer thickness.However,both the number and distribution of phases in the weld change with bonding temperature,holding time and Ti metallizing layer thickness.The shear strength of joints was changed by the bonding temperature,holding time and Ti metallizing layer thickness because these factors influenced the distribution uniformity of solid solution and the number of IMCs in the weld.When the thickness of Ti metallized layer was 0.2 μm,maximum shear strength of 138 MPa was achieved at 1 080 °C for 5 min.