Printing parameters and strengthening mechanism of pneumatic injection additive manufacturing with iron powder slurry

Wu, Wenzheng; Du, Haidong; Sui, Hang; Guo, Xiangming; Wang, Bofan; Zhao, Ji

doi:10.1007/s00170-017-1126-z

Cited by 9 publications

(3 citation statements)

References 22 publications

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“…The dimensional error was calculated using the formal given in Equation (1)

where actual size is measured from the printed scaffold and dimensions from the CAD model. The printed green sample’s average dimensional inaccuracy was determined to be 1.62%, which is lower than the other production processes mentioned in the literature [ 32 ]. Using a universal testing device, the scaffold’s compressive strength was evaluated (WDW-100) and the compressive strength of the green sample was measured as 2.31 MPa as shown in Figure 10 , which is nearly the same as in other works carried out in the literature [ 33 ].…”

Section: Resultsmentioning

confidence: 92%

Rheological Behavior and Printability Study of Tri-Calcium Phosphate Ceramic Inks for Direct Ink Writing Method

et al. 2023

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In the biomedical industry, tricalcium phosphate is a bioceramic substance that is frequently employed in the fabrication of scaffolds and bone structures. Fabrication of porous ceramic structures using conventional manufacturing techniques is very challenging because of the brittle nature of the ceramics, which has led to a newly adapted direct ink writing additive manufacturing method. This work investigates the rheology and extrudability of TCP inks to produce near-net-shape structures. Viscosity and extrudability tests found that stable TCP: Pluronic ink of 50 vol.% was more reliable compared to other tested inks prepared from a functional polymer group polyvinyl alcohol. A line study was carried out to identify the printing parameters suitable for printing structures from the selected ink with lesser dimensional error. Printing speed 5 mm/s and extrusion pressure 3 bar was found suitable to print a scaffold through a nozzle of 0.6 mm, keeping the stand-off distance equal to the nozzle diameter. The printed scaffold was further investigated for its physical and morphological structure of the green body. A suitable drying behavior was studied to remove the green body without cracking and wrapping before the sintering of the scaffold.

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“…The dimensional error was calculated using the formal given in Equation (1)

Section: Resultsmentioning

confidence: 92%

Rheological Behavior and Printability Study of Tri-Calcium Phosphate Ceramic Inks for Direct Ink Writing Method

et al. 2023

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“…The produced scaffolds had fully interconnected porous networks, and the process could reproduce designed architecture with a high level of accuracy and repeatability. Wu et al (2018) introduced a pneumatic injection-based extruder to print complex 3D structures with iron powder slurry. A similar slurry-based process was introduced by Sercombe et al (1999), Souvignier et al (2001) for 3D printing of sinterable aluminium alloys.…”

Section: Introductionmentioning

confidence: 99%

Development of paste extrusion-based metal additive manufacturing process

Dayam

Tandon

Priyadarshi

2022

RPJ

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Purpose This study aims to explore a technique of metal additive manufacturing (MAM) for producing parts in aluminium. The proposed technique mimics the process of metal injection moulding but with the tools meant for fused freeform fabrication machines. Design/methodology/approach The work focusses on the preparation of novel feedstock by mixing the aluminium powder with binders made from different compositions of high-density polyethylene, paraffin wax, petroleum jelly and stearic acid. Further, a novel experimental setup with a paste extruder was designed to print the test samples. A sintering cycle was developed in-house along with a thermal debinding procedure. An experimental campaign was also carried with the proposed technique to establish a proof-of-concept. Produced samples were tested for part density, hardness, compressive strength and tensile strength. Findings The results indicate geometrical accuracy was an issue owing to the presence of petroleum jelly in the binder-powder mixture. Therefore, machining as a post-processing operation seems to be unavoidable. The study also elucidates that the printed specimen may require further heat treatment to replace wrought alloys. However, the sintered parts show hardness and compressive strength similar to that of wrought aluminium alloy. Originality/value The novelty of the work is to develop the cost effective and scalable powder extrusion-based MAM process for printing the aluminium parts.

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“…It is a non-mold forming method based on the principle of pneumatic injection that uses a liquid suspension, slurry, or colloid as the printing material [10][11][12]. Recently, the technology of pneumatic injection additive manufacture has been widely used in the additive manufacture of metals [13][14][15], ceramics [16,17], batteries [18], biomedical engineering scaffolds [19,20], and biological tissue [21]. Jakus et al used poly(lactic-co-glycolic acid) (PLGA) as a binder and prepared iron oxide, nickel oxide, and copper oxide powder slurries to print complex three-dimensional structures using pneumatic injection manufacture and studied the tensile and compressive properties of the printed parts [22].…”

Section: Introductionmentioning

confidence: 99%

Optimization of Sintering Time and Holding Time for 3D Printing of Fe-Based Metallic Glasses

Liu

et al. 2018

Metals

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Fe-based metallic glasses are amorphous alloys with high strength, high hardness, and excellent corrosion resistance; however, the immaturity of processing methods has prevented their wide application in industrial production. Fe-based metallic glass parts were manufactured employing pneumatic injection additive manufacturing in this study. An evenly dispersed and stable Fe-based metallic glass powder slurry with a solids content of 50% was prepared firstly. Then the Fe-based metallic glass parts were printed. The printed parts were dried, debinded, and sintered for strengthening. The deformations of the printed parts and sintered parts relative to the original model were then analyzed by a 3D scanning reconstruction method. The slightly average bulging and sunken deformation of the printed parts and sintered parts confirmed the good printing accuracy of the pneumatic injection manufacture system. The effects of the sintering temperature and holding time on the properties of the sintered parts were studied. For a sintering temperature of 580 • C and holding time of 1 h, the surface quality of the sintered parts was better. The sintering of 3D-printed Fe-based metallic glass parts was preliminarily realized in this study, and the feasibility of preparing Fe-based metallic glass using pneumatic injection additive manufacture was verified.

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Printing parameters and strengthening mechanism of pneumatic injection additive manufacturing with iron powder slurry

Cited by 9 publications

References 22 publications

Rheological Behavior and Printability Study of Tri-Calcium Phosphate Ceramic Inks for Direct Ink Writing Method

Rheological Behavior and Printability Study of Tri-Calcium Phosphate Ceramic Inks for Direct Ink Writing Method

Development of paste extrusion-based metal additive manufacturing process

Optimization of Sintering Time and Holding Time for 3D Printing of Fe-Based Metallic Glasses

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