Solution Synthesis of Powder Materials Based on Magnesium Phosphates for Stereolithographic 3D Printing

Powders of Mg3(PO4)2·22H2O, MgHPO4·3H2O, NaMg4(PO4)3·xH2O, and NH4MgPO4·6H2O have been synthesized by precipitation at 25°C from solutions of different salts, magnesium oxide, and phosphoric acid. Depending on precursors, products of different compositions were obtained at pH 9 and characterized using X-ray powder diffraction, X-ray electron spectroscopy, and static light scattering. The selection of sintering mode for printed sample was carried out using TG and DTA to determine temperature range to remove organic component of printing suspension. A fundamental possibility has been shown for preparing porous ceramics by 3D printing from magnesium orthophosphate obtained by solution method with maximal amount of crystal water (Mg3(PO4)2·22H2O) and average size of agglomerates of 28.3 μm and Kelvin structure. This method opens a prospect for the use of ceramics based on magnesium phosphate, in particular magnesium orthophosphate, in regenerative medicine.