Mechanical and Wetting Properties of Ta2O5 and ZnO Coatings on Alloy Substrate of Cardiovascular Stents Manufactured by Casting and DMLS

Abstract

In the last years, additive manufacturing technologies have been developed, especially direct metal laser sintering, and used in the dental and medical implant domains. Cardiovascular stents have evolved from bioinert, bare metal cages to biomimetic devices that promote tissue regeneration or healing. In this paper, comparisons concerning mechanical properties between Co–Cr alloy and cast 304L stainless steel were realized using FEM analysis, necessary for manufacturing cardiovascular stents by DMLS technology using Co–Cr alloy. The purpose of this paper consists of the evaluation of the contact angle at the interface of the Co–Cr alloy manufactured by DMLS, respectively, cast stainless steel 304L, and thin film deposition realized by the e-gun method (Ta2O5 and ZnO). Scanning electronic microscopy SEM and EDX techniques were employed for morphological investigation of the sintered samples manufactured by the DMLS process. They were also used for semi-quantitative and qualitative chemical and metallographic analyses. The e-gun coating was used to obtain thin films with the nanometer order of Ta2O5 and ZnO with a protective role to improve the corrosion resistance, roughness, and antiseptic role.

Hybrid Material Extrusion Process Optimization for Printability and Adhesion in 3D‐Printed Electronics

“…In this research, an increased layer height led to a smaller number of layers, which was observed to contribute to the thickness deviation. Stojkovic et al [ 59 ] also reported that layer height has a clear impact on the dimensional accuracy of MEX 3D‐printed parts, although the specific influence may vary depending on the material and other printing parameters. However, the individual effects of printing temperature and layer height on the thickness deviation are not clear in Figure 4A as multiple factors can influence dimensional inaccuracy simultaneously.…”