No abstract

No abstract

Effects of MgO-Na 2 O-P 2 O 5 -based sintering additives on densification, microstructure, hardness, compression strength, and biodegradability of b-tricalcium phosphate (b-TCP) ceramics were studied. Three additive compositions were prepared and introduced into b-TCP. Uniaxially compacted ceramic structures, sintered at 12501C in air, were characterized. Scanning electron microscopy was used to study the microstructure. The X-ray diffraction technique was used for phase analysis. Results showed that these additives modified the microstructure and improved the sintered density and mechanical properties. An increase of 9% in density, 40% in hardness and 38% in compression strength were achieved. Biodegradation analysis revealed that these additives could tailor the rate of resorption and hardness degradation of b-TCP. P 2 O 5 -based additives were selected and prepared based on its ternary-oxide phase diagram. Constituent powders were mixed in stoichiometric ratios based on their phase compositions. 875J ournal

In this research, we studied and analyzed the effects of four different oxide-based sintering additives on densification, mechanical behavior, biodegradation and biocompatibility of tricalcium phosphate (TCP) bioceramics. Selective sintering additives were introduced into pure TCP ceramics, in small quantities, through homogeneous mixing, using a mortar and pestle. The consequent powders of different compositions were pressed into cylindrical compacts, uniaxially and sintered at elevated temperatures, 1150 degrees C and 1250 degrees C, separately in a muffle furnace. X-ray powder diffraction technique was used to analyze the phase-purity of TCP after sintering. Hardness of these sintered specimens was evaluated using a Vickers hardness tester. Sintered cylindrical samples were tested under uniaxial compressive loading, as a function of composition to determine their failure strength. Biodegradation studies conducted using simulated body fluid under dynamic environment, revealed that these additives could control the rate of resorption and hardness degradation of TCP ceramics.

No abstract