Effect of magnesia and zirconia on the mechanical and biological properties of calcium silicate ceramics at C\S ratio of 0.5

3^rd International Conference and Expo on Ceramics and Composite Materials

June 26-27, 2017 Madrid, Spain

Amira M M Amin

Central Metallurgical Research & Development Institute, Egypt

Posters & Accepted Abstracts: J Material Sci Eng

Abstract :

Recently, many research works have been done on the bio-ceramic materials based CaO-SiO2 system. But, unfortunately the data presented in these works are not enough to complete understanding the relation between the formed phases and the final properties of the produced materials. It is highly important to understand the microstructure-properties relationship for developing new bioceramics. This work describes the effect of magnesia in the presence of zirconia on the bioactivity, microstructure and physicomechanical properties of calcium silicate composition adjusted at calcia/silica ratio(C/S) of 0.5. A mixture from calcium carbonate and silica was conducted at C/S of 0.5. 20 wt.% of magnesia and 5-25 wt.% of ZrO2 were added. Each mixture was mixed with ethanol in a planetary ball mill, dried, formed and fired at a temperature of 1325�?±5�?°C. Phase composition, FE-SEM, and physico-mechanical properties of the fired specimens were determined and explained. The in vitro bioactivities of these specimens were investigated by analysis of their abilities to form apatite in the simulated body fluid (SBF) for a short time (7 days) using SEM-EDS. The findings indicated that the surface of the specimens containing 5 and 15 wt.% ZrO2 were completely covered by single and multilayered hydroxyapatite (HA) precipitate typical to â�?�?cauliflowerâ�? morphology, respectively. The surface of the specimen containing 25 wt.% ZrO2 did not cover, but there are some scattered HA precipitate. The differences among the results were rationalized based on the phase composition. Vickers hardness and fracture toughness of the specimens of highly promised bioactivity were 2.32â�?�?2.57 GPa and 1.80â�?�?1.50 MPa. m1/2, respectively. The properties of these specimens are similar to the properties of human cortical bone. Consequently, these composites might be used as bone implant materials.

Biography :

Email: amoustafa_eng@hotmail.com