钛合金外科植入物表面缺陷分析

Analysis of Abnormal Bright-spot on the Surface of Titanium Alloy Surgical Implants

通过扫描电镜分别对髋臼杯和髓内钉两种TC4钛合金加工的医用植入物表面亮点缺陷进行组织分析,并对两种植入物亮点缺陷进行能谱成分分析。结果表明,髋臼杯各亮点区域呈现凹坑状,具有明显的方向性,亮点处成分和基体基本一致,组织都是等轴α+β相,为机械划蹭所致。髓内钉区域1~3组织为细小的柱状组织;区域4组织为单一α相。分析可知,区域1~3是由于熔融态的钛屑附着在基体表面形成的,区域4为"组织α化层"。

Scanning electron microscope was used to observe the macroscopic morphology and microstructure of the bright spot defects on the surface of surgical implants of acetabular cup and intramedullary nail processed by TC4 titanium alloys.The components of the bright spot defects in the two implants were analyzed by energy spectrum analysis.The results show that the bright spot areas of the acetabular cup presents pit-shaped with obvious directionality,and the composition of the bright spots are basically the same with the matrix,and the microstructrue are all equiaxedα+βphases,so the defects are caused by mechanical scratching.The microstructure of intramedullary nails 1#~3# point-like area belongs to a fine columnar structure,while the microstructrue of 4# point-like is a singleαphase.The defects in intramedullary nails 1#~3# point-like area is the adhesion of molten titanium scraps to the surface of the substrate and 4# area may be"tissueαlayer".