Tailoring hydroxyapatite microspheres by spray-drying for powder bed fusion feedstock

Abstract

The present work deals with a study on the physical characteristics of hydroxyapatite microspheres produced by spray-drying process through different operating conditions. Obtained hydroxyapatite microspheres will be used as powder feedstock in powder bed selective laser processing additive manufacturing technologies where the flowability and the particle size distribution of the powder feedstock is of special importance. Spray air pressure and solid content of the slurries were the most influent parameters to control the final particle size distribution, while higher air pressure and temperatures gave the higher process recovery rate. The use of polyvinyl alcohol as organic binder increased the granules strength. The produced hydroxyapatite microspheres were found to fulfil the powder bed selective laser processing feedstock requirements, keeping the physico-chemical properties of the material. These promising results confirm the use of a spray dryer as an efficient method for the production of hydroxyapatite microspheres for powder bed selective laser processing.

Characterization of hydroxyapatite from recycled fish scale and its application as a filler in a biodegradable food tray

“…HAp has been added to poly‐L‐lactic acid, polycaprolactone, and poly(3‐hydroxybutyrate‐co‐3‐hydroxyvalerate) for applications in tissue engineering and implantology 36 . However, there are few reports of the application of HAp as a filler in starch‐based bioplastics 37 .…”

“…HAp has been added to poly-L-lactic acid, polycaprolactone, and poly(3-hydroxybutyrate-co-3-hydroxyvalerate) for applications in tissue engineering and implantology. 36 However, there are few reports of the application of HAp as a filler in starch-based bioplastics. 37 Therefore, we fabricated a prototype biodegradable food tray produced by the compression molding of a starch foam composite with 5 wt% of HAp 1 M. Well-shaped foam trays were obtained with smooth and homogenous surfaces (Figure 5A).…”

Tailoring hydroxyapatite suspensions by stirred bead milling

“…And this was possible without major alteration of the composition or the structural phase of the initial HA product. As mentioned in the introduction, the utilization of these suspensions via the spray-drying process and the subsequent PBF additive manufacturing process was already explored [22,23].…”

“…The band at 1400 cm − 1 was attributed to the vibration band from C-H bending from the methacrylate backbone of the dispersant DC [60]. Whether or not the presence of DC affects the posterior spray-drying step is detailed in another paper [22].…”

“…The particle size reduction by stirred bead milling will be the focus of the present paper. The next steps (drying, agglomeration, and shaping from powder into solid parts) have been discussed in recent works [22,23].…”