Synthesis and phase evolution of a glass-ceramicbiomaterial with near-eutectic composition of thepseudo-binary system diopside–tricalciumphosphate


Claudia Magdalena López-Badillo

A glass-ceramic biomaterial with near-eutectic composition of the pseudo-binary systemdiopside (CMS2, CaMgSi2O6)–tricalcium phosphate [C3P, Ca3(PO4)2], with a weight compo-sition of 61% CMS2–39% C3P, was synthesized by the so-called “petrurgic method”. Threedifferent cooling rates (0.5, 1 and 2◦C/h) were used through the mushy zone. The synthesizedmaterials showed a microstructure consisting of -C3Pss (solid solution of CMS2in C3P) pri-mary skeletal dendrites, with a peculiar comb-like morphology, and which were embeddedin a matrix of lamellar CMS2–-C3Pss eutectic phase. The matrix also presumably containeda small amount of CaO–SiO2glass segregated during formation of the -C3Pss phase. Thecooling rate used through the mushy zone affected the microstructure and phase compo-sition of the synthesized materials. The dendrites of the primary -C3Pss phase becamesmaller and thicker with decreasing cooling rate, while the level of substitution of Mg forCa (x) decreased and that of Si for P (ı) increased in the latter phase, and the CMS2/-C3Pssweight ratio tended to increase slightly in the interdendritic matrix, with increasing coolingrate.

Artículo-CMLB 6 2020