Mechanical and Corrosion Behaviour in Simulated Body Fluid of As-Fabricated 3D Porous L-PBF 316L Stainless Steel Structures for Biomedical Implants.

IF 5 3区 医学 Q1 ENGINEERING, BIOMEDICAL
Pedro Nogueira, João Magrinho, Luis Reis, Augusto Moita de Deus, Maria Beatriz Silva, Pedro Lopes, Luís Oliveira, António Castela, Ricardo Cláudio, Jorge L Alves, Maria Fátima Vaz, Maria Carmezim, Catarina Santos
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Abstract

Laser powder bed fusion (L-PBF) is one of the most promising additive manufacturing technologies for creating customised 316L Stainless Steel (SS) implants with biomimetic characteristics, controlled porosity, and optimal structural and functional properties. However, the behaviour of as-fabricated 3D 316L SS structures without any surface finishing in environments that simulate body fluids remains largely unknown. To address this knowledge gap, the present study investigates the surface characteristics, the internal porosity, the corrosion in simulated body fluid (SBF), and the mechanical properties of as-fabricated 316L SS structures manufactured by L-PBF with rhombitruncated cuboctahedron (RTCO) unit cells with two distinct relative densities (10 and 35%). The microstructural analysis confirmed that the RTCO structure has a pure austenitic phase with a roughness of ~20 µm and a fine cellular morphology. The micro-CT revealed the presence of keyholes and a lack of fusion pores in both RTCO structures. Despite the difference in the internal porosity, the mechanical properties of both structures remain within the range of bone tissue and in line with the Gibson and Ashby model. Additionally, the as-fabricated RTCO structures demonstrated passive corrosion behaviour in the SBF solution. Thus, as-fabricated porous structures are promising biomaterials for implants due to their suitable surface roughness, mechanical properties, and corrosion resistance, facilitating bone tissue growth.

用于生物医学植入物的三维多孔 L-PBF 316L 不锈钢结构在模拟体液中的机械和腐蚀行为。
激光粉末床熔融(L-PBF)是最有前途的增材制造技术之一,可用于制造具有仿生物特征、可控孔隙率以及最佳结构和功能特性的定制 316L 不锈钢(SS)植入体。然而,在模拟体液的环境中,未经任何表面处理的三维 316L 不锈钢结构的性能在很大程度上仍是未知数。为了填补这一知识空白,本研究调查了模拟体液(SBF)中的表面特征、内部孔隙率、腐蚀情况,以及通过 L-PBF 制造的具有菱形截顶立方体(RTCO)单元格且具有两种不同相对密度(10% 和 35%)的 316L SS 结构的机械性能。微观结构分析证实,RTCO 结构具有纯奥氏体相,粗糙度约为 20 µm,具有精细的晶胞形态。显微 CT 显示,两种 RTCO 结构中都存在键孔,缺乏熔融孔。尽管内部孔隙率不同,但两种结构的机械性能仍在骨组织范围内,符合吉布森和阿什比模型。此外,制作完成的 RTCO 结构在 SBF 溶液中表现出被动腐蚀行为。由此可见,原样制造的多孔结构具有合适的表面粗糙度、机械性能和耐腐蚀性,有利于骨组织的生长,是一种很有前途的植入体生物材料。
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来源期刊
Journal of Functional Biomaterials
Journal of Functional Biomaterials Engineering-Biomedical Engineering
CiteScore
4.60
自引率
4.20%
发文量
226
审稿时长
11 weeks
期刊介绍: Journal of Functional Biomaterials (JFB, ISSN 2079-4983) is an international and interdisciplinary scientific journal that publishes regular research papers (articles), reviews and short communications about applications of materials for biomedical use. JFB covers subjects from chemistry, pharmacy, biology, physics over to engineering. The journal focuses on the preparation, performance and use of functional biomaterials in biomedical devices and their behaviour in physiological environments. Our aim is to encourage scientists to publish their results in as much detail as possible. Therefore, there is no restriction on the length of the papers. The full experimental details must be provided so that the results can be reproduced. Several topical special issues will be published. Scope: adhesion, adsorption, biocompatibility, biohybrid materials, bio-inert materials, biomaterials, biomedical devices, biomimetic materials, bone repair, cardiovascular devices, ceramics, composite materials, dental implants, dental materials, drug delivery systems, functional biopolymers, glasses, hyper branched polymers, molecularly imprinted polymers (MIPs), nanomedicine, nanoparticles, nanotechnology, natural materials, self-assembly smart materials, stimuli responsive materials, surface modification, tissue devices, tissue engineering, tissue-derived materials, urological devices.
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