Precision additive manufacturing of NiTi parts using micro direct metal deposition

Khademzadeh, Saeed; Zanini, Filippo; Bariani, Paolo Francesco; Carmignato, Simone

doi:10.1007/s00170-018-1822-3

Cited by 18 publications

(5 citation statements)

References 20 publications

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“…Moreover, an increased scanning speed can improve the surface quality and decrease the content of micropores. The surface roughness of LPBF-fabricated NiTi may be slightly enhanced with an increase in the scanning speed [142]. A lower scanning speed for LPBF can lead to an enhanced transformation temperature, i.e., stabilized martensite [141].…”

Section: Powder-bed Fusion (Pbf) 221 Laser Powder-bed Fusion (Lpbf)mentioning

confidence: 99%

Additive Manufacturing: An Opportunity for the Fabrication of Near-Net-Shape NiTi Implants

Safavi

Bordbar‐Khiabani

Khalil‐Allafi

et al. 2022

JMMP

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Nickel–titanium (NiTi) is a shape-memory alloy, a type of material whose name is derived from its ability to recover its original shape upon heating to a certain temperature. NiTi falls under the umbrella of metallic materials, offering high superelasticity, acceptable corrosion resistance, a relatively low elastic modulus, and desirable biocompatibility. There are several challenges regarding the processing and machinability of NiTi, originating from its high ductility and reactivity. Additive manufacturing (AM), commonly known as 3D printing, is a promising candidate for solving problems in the fabrication of near-net-shape NiTi biomaterials with controlled porosity. Powder-bed fusion and directed energy deposition are AM approaches employed to produce synthetic NiTi implants. A short summary of the principles and the pros and cons of these approaches is provided. The influence of the operating parameters, which can change the microstructural features, including the porosity content and orientation of the crystals, on the mechanical properties is addressed. Surface-modification techniques are recommended for suppressing the Ni ion leaching from the surface of AM-fabricated NiTi, which is a technical challenge faced by the long-term in vivo application of NiTi.

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Section: Powder-bed Fusion (Pbf) 221 Laser Powder-bed Fusion (Lpbf)mentioning

confidence: 99%

Additive Manufacturing: An Opportunity for the Fabrication of Near-Net-Shape NiTi Implants

Safavi

Bordbar‐Khiabani

Khalil‐Allafi

et al. 2022

JMMP

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“…There are several monitoring and evaluating systems such as high-speed digital camera systems, scanning electron micrographs (SEM), micro-computed tomography (μCT), laser CMM, etc. For example, Khademzadeh et al [26] used both μCT and SEM to evaluate micro porosity and micro-scale dimensional accuracy of parts produced by μDMD process. One of the important factor in the use of CT is the effect of surface roughness on dimensional measurements.…”

Section: Process Monitoring and Non-destructive Testingmentioning

confidence: 99%

Utilization of Metal Additive Manufacturing (AM) in Precision Oriented Mechanical Part Production

Javidrad¹,

Larky²

2019

IJSEA

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Metal additive manufacturing (AM) is an innovative technology that opens up new visions in any industrial field. This technology is growing rapidly, entering various industries every day. After over 30 years from the introduction of metal additive manufacturing into the industrial world, the today's demand is to make mechanical parts with high precision by metal additive manufacturing. Until now, methods like high precision grinding or micro-machining processes are used to make more precise dimensions in parts. Those methods have their own limits and deficiencies that could be eliminated with additive manufacturing. In this paper, attempts are made to compare conventional precise processes with metal additive manufacturing from different aspects. Surface finish in these two categories is discussed and some advice for improving the surface quality of metal additive manufacturing parts is proposed. Applicability and utilization of metal additive manufacturing as a precise metal fabrication method in various industries with examples are also discussed.

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“…To date, several micromanufacturing methods have been developed to produce HAR-MMMCs, and each of them has its own nature and advantages. These methods include electric discharge machining [5], mechanical microdrilling and micromilling [6], laser beam machining [7], electron beam machining [8], metal additive micromanufacturing processes [9], etc. However, the abovementioned methods either have great difficulty producing HAR-MMMCs in a large volume mode or have significant difficulty achieving the desired machining accuracy and material properties simultaneously.…”

Section: Introductionmentioning

confidence: 99%

Jet Electroforming of High-Aspect-Ratio Microcomponents by Periodically Lifting a Necked-Entrance Through-Mask

Zhang,

Ming,

Zhang

et al. 2024

Micromachines

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High-aspect-ratio micro- and mesoscale metallic components (HAR-MMMCs) can play some unique roles in quite a few application fields, but their cost-efficient fabrication is significantly difficult to accomplish. To address this issue, this study proposes a necked-entrance through-mask (NTM) periodically lifting electroforming technology with an impinging jet electrolyte supply. The effects of the size of the necked entrance of the through-mask and the jet speed of the electrolyte on electrodeposition behaviors, including the thickness distribution of the growing top surface, deposition defect formation, geometrical accuracy, and electrodeposition rate, are investigated numerically and experimentally. Ensuring an appropriate size of the necked entrance can effectively improve the uniformity of deposition thickness, while higher electrolyte flow velocities help enhance the density of the components under higher current densities, reducing the formation of deposition defects. It was shown that several precision HAR-MMMCs with an AR of 3.65 and a surface roughness (Ra) of down to 36 nm can be achieved simultaneously with a relatively high deposition rate of 3.6 μm/min and thickness variation as low as 1.4%. Due to the high current density and excellent mass transfer effects in the electroforming conditions, the successful electroforming of components with a Vickers microhardness of up to 520.5 HV was achieved. Mesoscale precision columns with circular and Y-shaped cross-sections were fabricated by using this modified through-mask movable electroforming process. The proposed NTM periodic lifting electroforming method is promisingly advantageous in fabricating precision HAR-MMMCs cost-efficiently.

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Precision additive manufacturing of NiTi parts using micro direct metal deposition

Cited by 18 publications

References 20 publications

Additive Manufacturing: An Opportunity for the Fabrication of Near-Net-Shape NiTi Implants

Additive Manufacturing: An Opportunity for the Fabrication of Near-Net-Shape NiTi Implants

Utilization of Metal Additive Manufacturing (AM) in Precision Oriented Mechanical Part Production

Jet Electroforming of High-Aspect-Ratio Microcomponents by Periodically Lifting a Necked-Entrance Through-Mask

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