Interface characterization of hybrid biocompatible fiber-metal laminates after laser-based surface treatment

Abstract

Fiber metal-laminates, which are based on titanium and a self-reinforced biocompatible polylactide (srPLA), are a promising approach to extend the range of materials for medical implants. A laser-based surface pre-treatment results in a strong bond between the metallic and polymeric part that are joined via hot-pressing. An extensive parameter study supported by scanning electron microscopy of the titanium sheets as well as shear edge testing with the hybrid material, allowed for a direct definition of suitable laser structures for the pre-treatment of the metallic component. A post-mortem optical examination also gave a qualitative insight into the failure mechanisms. It was possible to show that a laser induced pre-treatment significantly enhanced interface strength compared to an untreated surface with the considered testing method. Hence, a laser-induced surface treatment is a suitable pre-treatment process for the selected material combination, titanium and self-reinforced polylactide (PLA), to achieve increased interface strength.