ИСТИНА

As a dye, carbon-coloured powders can be used in the production of porous ceramics with given geometry of porous space based on calcium phosphates using 3D printing of semi-finished items from light-cured suspensions loaded with highly dispersed powders. Dark grey powders of calcium polyphosphate Ca(PO3)2 was prepared via heat treatment of monocalcium phosphate monohydrate (MCPM) Ca(H2PO4)2.H2O after treating in water solution of lactic acid under mechanical activation using planetary mill. Dark grey coloured powders of calcium polyphosphate can be used as a multifunctional additive in technology of porous calcium phosphate ceramics. Due to dark grey colour it can be an agent improving lateral resolution of 3D stereolithographic printing of semi-finished items with given geometry of porous space. And due to the melting point (964 oC) it can be an additive making the firing temperature of calcium phosphate ceramics lower. Acknowledgements: The financial support of RFBR project # 18-29-11079.