title: CoCr F75 scaffolds produced by additive manufacturing: Influence of chemical etching on powder removal and mechanical performance.
abstract: Additive manufacturing techniques such as Selective Laser Melting (SLM) allow carefully controlled production of complex porous structures such as scaffolds. These advanced structures can offer many interesting advantages over conventionally produced products in terms of biological response and patient specific design. The surface finish of AM parts is often poor because of the layer wise nature of the process and adhering particles. Loosening of these particles after implantation should be avoided, as this could put the patient's health at risk. In this study the use of hydrochloric acid and hydrogen peroxide mixtures for surface treatment of cobalt-chromium F75 scaffolds produced by SLM is investigated. A 27% HCl and 8% H2O2etchant proved effective in removing adhering particles while retaining the quasi-static and fatigue performance of the scaffolds.
authors.affiliation: Department of Mechanical Engineering, KU Leuven, Leuven, Belgium. Electronic address: Brecht.vanhooreweder@kuleuven.be.
authors.forename: Brecht
authors.initials: B
authors.lastname: Van Hooreweder
authors.affiliation: Department of Materials Engineering, KU Leuven, Leuven, Belgium; (c)3DSystems Leuven, Grauwmeer 14, B-3001 Leuven, Belgium.
authors.forename: Karel
authors.initials: K
authors.lastname: Lietaert
authors.affiliation: (c)3DSystems Leuven, Grauwmeer 14, B-3001 Leuven, Belgium.
authors.forename: Bram
authors.initials: B
authors.lastname: Neirinck
authors.affiliation: Department of Materials Engineering, KU Leuven, Leuven, Belgium.
authors.forename: Nicholas
authors.initials: N
authors.lastname: Lippiatt
authors.affiliation: Department of Materials Engineering, KU Leuven, Leuven, Belgium.
authors.forename: Martine
authors.initials: M
authors.lastname: Wevers
mesh_terms: D001672:Biocompatible Materials; D002857:Chromium; D003035:Cobalt; D006801:Humans; D006851:Hydrochloric Acid; D006861:Hydrogen Peroxide; D007834:Lasers; D008422:Materials Testing; D016062:Porosity; D011208:Powders; D019736:Prostheses and Implants; D054457:Tissue Scaffolds
chemical_list: D001672:Biocompatible Materials; D011208:Powders; D002857:Chromium; D003035:Cobalt; D006861:Hydrogen Peroxide; D006851:Hydrochloric Acid
keywords: Additive manufacturing; Biomaterials; CoCr scaffolds; Selective laser melting (SLM); Surface modification; Surface roughness