Surface Finishes for Ti-6Al-4V Alloy Produced by Direct Metal Laser Sintering

Longhitano, Guilherme Arthur; Larosa, Maria Aparecida; Munhoz, André Luiz Jardini; Zavaglia, Cecília Amélia de Carvalho; Ierardi, Maria Clara Filippini

doi:10.1590/1516-1439.014415

Cited by 53 publications

(25 citation statements)

References 12 publications

(19 reference statements)

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“…However, it is necessary to consider the transformation of the original microgeometry and the creation of a new surface morphology corresponding to the abrasive used (grit, shot) and blasting parameters (impact velocity, impact angle). Longhitano [37] reports a lower roughness for as-built samples made under the same conditions as in our research, but he turned the sample by 30° for each roughness measurement, eliminating the influence of the building direction, and stated lower final values than the authors of this article. The best match of results was obtained in [38], where Ra on the side wall of as-build samples produced by the same technology varied from 9 to 21 μm, according to scanning speed.…”

Section: Roughness Of Materialssupporting

confidence: 46%

“…The effect of build orientation on material properties is so significant that Milton [39] has even identified a different resulting roughness after the machining of samples with different build-up directions during additive manufacturing. Since many of the partially melted particles may have low adhesion to the sintered material and could be released into the body, it is advisable to blast the surfaces [14,36], possibly followed by etching [6], electropolishing, chemical etching, or a combination of these [37]. Blasting brings several benefits to the product, including removal of particles with insufficient adhesion to the surface and surface strengthening, which results in increased resistance of the product to fatigue.…”

Section: Roughness Of Materialsmentioning

confidence: 99%

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The Effect of Position of Materials on a Build Platform on the Hardness, Roughness, and Corrosion Resistance of Ti6Al4V Produced by DMLS Technology

Guzanová

Draganovská

Ižaríková

et al. 2019

Metals

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This article is focused on the effect of position on a build platform on the hardness, roughness and corrosion rate of parts (Ti6Al4V) produced by direct metal laser sintering (DMLS) technology. During the sintering process, the test samples were located at key positions—at the corners and in the middle of the build platform. An experimental program started with a microstructure investigation in two perpendicular directions in individual positions. The selected mechanical property—hardness—was investigated on metallographic cuts in both directions and all positions, and data sets underwent a statistical analysis (analysis of variance (ANOVA), t-test, F-test). The same procedure was repeated for an assessment of position effect to surface roughness (Kruskal–Wallis test) and material corrosion resistance. On the build platform, the course of hardness, roughness, and corrosion rate values that can be expected in individual positions was mapped in detail.

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Section: Roughness Of Materialssupporting

confidence: 46%

Section: Roughness Of Materialsmentioning

confidence: 99%

The Effect of Position of Materials on a Build Platform on the Hardness, Roughness, and Corrosion Resistance of Ti6Al4V Produced by DMLS Technology

Guzanová

Draganovská

Ižaríková

et al. 2019

Metals

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show abstract

“…It has been established that osseointegration of titanium implants is facilitated through increasing the surface area of the implant, either through surface texturing [26,40,41] or the inclusion of perforations through the implant [40]. Osteoblasts attach more rapidly to rougher surfaces, and increasing porosity increases osteoblast growth, nutrient delivery and waste removal [42].…”

Section: Discussionmentioning

confidence: 99%

Manual polishing of 3D printed metals produced by laser powder bed fusion reduces biofilm formation

et al. 2019

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Certain 3D printed metals and surface finishes may be better suited for canine patient specific orthopedic implants on the basis of minimizing potential bacterial biofilm growth. Thirty disks each of titanium alloy, stainless steel, and cobalt chromium alloy were 3D printed via laser powder bed fusion. Fifteen disks of each metal were subsequently polished. After incubation with a robust biofilm-forming methicillin-resistant Staphylococcus pseudintermedius isolate, disks were rinsed and sonicated to collect biofilm bacteria. Serial dilutions were plated on blood agar, and colony forming units were counted log (ln) transformed for analysis of variance. Interference microscopy quantified surface roughness for comparison to biofilm growth. Scanning electron microscopy on both pre- and post-sonicated disks confirmed biofilm presence and subsequent removal, and visualized surface features on cleaned disks. Significantly more bacteria grew on rough versus polished metal preparations (p < 0.0001). Titanium alloy had more bacterial biofilm growth compared to cobalt chromium alloy (p = 0.0001) and stainless steel (p < 0.0001). There were no significant growth differences between cobalt chromium alloy and stainless steel (p = 0.4737). Relationships between biofilm growth and surface roughness varied: positive with the rough preparations and negative with the smooth. Polished preparations had increased variance in surface roughness compared to rough preparations, and within disk variance predominated over between disk variance for all preparations with the exception of rough cobalt chromium alloy and rough stainless steel. Using scanning electron microscopy, bacterial biofilms tended to form in crevices. Overall, manual polishing of 3D printed surfaces significantly reduced biofilm growth, with preparation-specific relationships between surface roughness and biofilm growth. These results suggest that metallic implants produced by laser powder bed fusion should be polished. Further research will elucidate the optimal surface roughness per preparation to reduce potential biofilm formation and implant associated infection.

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“…Chemical properties, such as corrosion resistance, are also very good [1,2]. Moreover, it is known that titanium and its alloys have good biocompatibility with the human body, as well as antiseptic properties [1,3]. Because of these properties, titanium alloys are often used in dental medicine.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of Ti-Zr alloy by powder metallurgy

2019

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Due to good properties, which meet the requirements for use as biomaterials, titanium and titanium alloys have been increasingly used as dental implants. Until recently, dental titanium alloys were produced by casting. Since this process does not meet the terms of economy and efficiency, the production of titanium implants by powder metallurgy are very promising. Therefore, in this work titanium alloy with addition of 10 at. % zirconium is prepared by powder metallurgy with the goal of obtaining the best producing conditions, which would result in the titanium alloy of the adequate properties for use as dental implants. High values of green densities were achieved even only by uniaxial pressing. Further, sintering temperature of 1673 K resulted in the alloy of the highest sintered density and microhardness. The results of this investigation revealed the processing parameters applicable for the production of titanium-zirconium dental implants by powder metallurgy.

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Surface Finishes for Ti-6Al-4V Alloy Produced by Direct Metal Laser Sintering

Cited by 53 publications

References 12 publications

The Effect of Position of Materials on a Build Platform on the Hardness, Roughness, and Corrosion Resistance of Ti6Al4V Produced by DMLS Technology

The Effect of Position of Materials on a Build Platform on the Hardness, Roughness, and Corrosion Resistance of Ti6Al4V Produced by DMLS Technology

Manual polishing of 3D printed metals produced by laser powder bed fusion reduces biofilm formation

Synthesis of Ti-Zr alloy by powder metallurgy

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