سنتز هیدروکسی آپاتیت با استفاده از عملیات مکانوشیمیایی

Synthesis of hydroxyapatite via mechanochemical treatment

سنتز هیدروکسی آپاتیت با استفاده از عملیات مکانوشیمیایی

ABSTRACT

Hydroxyapatite powder was synthesized with calcium pyrophosphate (Ca2P2O7) and calcium carbonate (CaCO3) through solid-state reaction. The two powders were mixed in acetone and water, respectively, and the single phase of hydroxyapatite was observed to occur only in the powder milled in water, without the additional supply of water vapor during heat-treatment at 1100°C for 1 h. The results were explained in terms of the mechanochemical reaction that could supply enough amount of hydroxyl group to the starting powders to form a single phase of hydroxyapatite. Practical implication of the results is that the powder of high crystalline hydroxyapatite can be obtained by the simple milling in water and subsequent heat-treatment.

 

متالورژی پودر بیوکامپوزیت Ti35Nb2.5Sn و زینترسازی

Effect of milling time on microstructure of Ti35Nb2.5Sn/10HA

biocomposite fabricated by powder metallurgy and sintering

تاثیر زمان آسیاب کردن بر ریزساختار بیوکامپوزیت Ti35Nb2.5Sn/10HA

تولید‌شده با متالورژی پودر و زینتر‌سازی

ABSTRACT

A new β-Ti based Ti35Nb2.5Sn/10 hydroxyapitite (HA) biocompatible composite was fabricated by mechanical milling and pulsed current activated sintering(PCAS). The microstructures of Ti35Nb2.5Sn/10HA powder particles and composites sintered from the milled powders were studied. Results indicated that α-Ti phase began to transform into β-Ti phase after the powders were mechanically milled for 8 h. After mechanical milling for 12 h, α-Ti completely transformed into β-Ti phase, and the ultra fine Ti35Nb2.5Sn/10HA composite powders were obtained. And ultra fine grain sized Ti35Nb2.5Sn/10HA sintered composites were obtained by PCAS. The hardness and relative density of the sintered composites both increased with increasing the ball milling time.