The Influence of Selective Laser Melting (SLM) Process Parameters on In-Vitro Cell Response

Autor: Joanna Idaszek, Wojciech Święszkowski, Marcin Pisarek, Joanna Zdunek, Krzysztof Rozniatowski, Bartłomiej Wysocki, Akiko Yamamoto
Jazyk: angličtina
Rok vydání: 2018
Předmět:
Materials science
Hot Temperature
Surface Properties
heat treatments
Oxide
chemistry.chemical_element
surface chemistry
02 engineering and technology
010402 general chemistry
01 natural sciences
Catalysis
Article
Hydrofluoric Acid
Inorganic Chemistry
Contact angle
lcsh:Chemistry
chemistry.chemical_compound
Humans
Laser power scaling
Physical and Theoretical Chemistry
Selective laser melting
Porosity
Molecular Biology
lcsh:QH301-705.5
Spectroscopy
titanium oxides
pure titanium
internal stresses
Titanium
Organic Chemistry
General Medicine
021001 nanoscience & nanotechnology
Surface energy
chemical treatments
0104 chemical sciences
Computer Science Applications
Titanium powder
chemistry
Chemical engineering
lcsh:Biology (General)
lcsh:QD1-999
cell behavior
selective laser melting
0210 nano-technology
Zdroj: International Journal of Molecular Sciences
Volume 19
Issue 6
International Journal of Molecular Sciences, Vol 19, Iss 6, p 1619 (2018)
ISSN: 1422-0067
Popis: The use of laser 3D printers is very perspective in the fabrication of solid and porous implants made of various polymers, metals, and its alloys. The Selective Laser Melting (SLM) process, in which consolidated powders are fully melted on each layer, gives the possibility of fabrication personalized implants based on the Computer Aid Design (CAD) model. During SLM fabrication on a 3D printer, depending on the system applied, there is a possibility for setting the amount of energy density (J/mm3) transferred to the consolidated powders, thus controlling its porosity, contact angle and roughness. In this study, we have controlled energy density in a range 8&ndash
45 J/mm3 delivered to titanium powder by setting various levels of laser power (25&ndash
45 W), exposure time (20&ndash
80 µ
s) and distance between exposure points (20&ndash
60 µ
m). The growing energy density within studied range increased from 63 to 90% and decreased from 31 to 13 µ
m samples density and Ra parameter, respectively. The surface energy 55&ndash
466 mN/m was achieved with contact angles in range 72&ndash
128°
and 53&ndash
105°
for water and formamide, respectively. The human mesenchymal stem cells (hMSCs) adhesion after 4 h decreased with increasing energy density delivered during processing within each parameter group. The differences in cells proliferation were clearly seen after a 7-day incubation. We have observed that proliferation was decreasing with increasing density of energy delivered to the samples. This phenomenon was explained by chemical composition of oxide layers affecting surface energy and internal stresses. We have noticed that TiO2, which is the main oxide of raw titanium powder, disintegrated during selective laser melting process and oxygen was transferred into metallic titanium. The typical for 3D printed parts post-processing methods such as chemical polishing in hydrofluoric (HF) or hydrofluoric/nitric (HF/HNO3) acid solutions and thermal treatments were used to restore surface chemistry of raw powders and improve surface.
Databáze: OpenAIRE
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