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NANOCRYSTALLINE HARDYSTONITE SYNTHESIZED BY SOLID STATE PROCESS AS A NOVEL BIOCERAMIC FOR MEDICAL PURPOSES; PREPARATION AND CHARACTERIZATION

In this study, Hardystonite powder (Ca2ZnSi2O7) was synthesized by mechanical activation method as a solid state process. Specimens were composed of a blend of pure calcite, silica amorphous and ZnO with 50 % wt., 30 % wt. and 20 %wt., respectively. These powders were milled by high energy ball mill using ball-topowder ratio 10:1 and rotation speed (600 rpm) for 5 and 10 h. Then, the mixtures mechanical activated have been heated at 1100 oC for 3 h. XRD, SEM and BET performed on the samples to characterize. According to XRD results, the sample milled for 10 h just indicated the Hardystonite phase, with crystal size about 40 nm, while the sample milled for 5 h illustrate Hardystonite phase along with several phases. Based on energy transfer analysis, the energy amount transferred to the starting materials is 11.2 MJ/g for 10 h, causes the synthesis temperature reduces to 1100 C.