Naslov
Optimization of additively manufactured Si/Hydroxyapatite scaffolds by selective laser melting for bone tissue engineering applications

Autori
Ressler, Antonia ; Kamboj, Nikhil ; Ivanković, Hrvoje ; Hussainova, Irina

Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, sažetak, znanstveni

Skup
Ceramics in Europe 2022

Mjesto i datum
Kraków, Poljska, 10.07.2022. - 14.07.2022

Vrsta sudjelovanja
Poster

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
calcium silicate, hydroxyapatite, selective laser melting, scaffold

Sažetak
Selective laser melting (SLM) method is gaining increasing attention for the fabrication of scaffolds with different architecture for bone tissue engineering applications. The SLM method was used for the fabrication of powder mixtures of silicon (Si) and hydroxyapatite (HAp) to obtain porous scaffolds with a pore size of 400 μm. The used materials were mixtures of HAp/Si with weight ratios of 50/50 and 30/70. The process parameters such as weight percentage of phases, layer thickness, point distance, scanning speed, laser power, and energy density were optimized to obtain desired bioactive phases and mechanical properties of scaffolds. To understand the effect of different phase compositions and fabrication parameters on properties of obtained scaffolds, X- ray diffraction and Rietveld refinement analysis, microstructural evaluation and assessment of mechanical properties were conducted. Fabricated scaffolds with nominally added 50wt% of HAp were composed of Si and pseudowollastonite (PW, CaSiO3), where with a decrease of exposure time and laser current, the weight percentages of the PW phase decreased. In fabricated scaffolds, with nominally added 70wt% of HAp, along with Si and PW, the formation of larnite (Ca2SiO4) was detected. With a decrease of exposure time and laser current, the weight percentage of obtained calcium silicate phases decreased. The morphology of the scaffolds depends on the process parameters and used powder materials. The scaffolds fabricated with the lowest processing parameters have shown macroporous size and interconnection joint dimensions which are in the best agreement with the obtained CAD design. With a decrease of exposure time and laser current, and an increase of HAp phase, the mechanical properties of fabricated scaffolds decreased.

Izvorni jezik
Engleski

Znanstvena područja
Kemijsko inženjerstvo, Temeljne tehničke znanosti

POVEZANOST RADA