The influence of milling α-TCP in the formation of hydrxyapatite whiskers.

Guinéa Brasil C. Cardoso 1Sergio L. Ramos 2Cecilia C. Zavaglia 1Antonio Celso F. Arruda 3

1. UNICAMP, FEM, DEMA, Campinas 13083-860, Brazil
2. Universidade Federal de Santa Catarina (UFSC), Campus Universitario, Florianopolis 88040-900, Brazil
3. UNICAMP,FEM, DEP, Campinas 13083-860, Brazil

Abstract

The hydroxyapatite is one of the most biocompatible materials owing to similarities with mineral constituents of teeth and bones. They show very good biocompatibility with hard tissues, but unfortunately the mechanical properties of these materials are poor. One approach to improve their reliability is to increase its fracture toughness, which can be accomplished by precise control of the microstructure. A common way is to improve the mechanical brittleness is by the addition of short fibers or whiskers. The size of whiskers influences the mechanical properties; therefore the thinner it is the better the mechanical properties of the whiskers. This can be modified by the milling of α-TCP, which was later used in the hydrolysis, resulting whiskers. In this research, the goal was to observe the influence of the milling α-TCP, in ball mill, for zero, 24 and 48 hours. For these preparation were used α-TCP made in lab, where its shows lowest level of Mg. Then, HA whiskers were made by the alkaline (pH = 11) hydrolysis of α-TCP, as described elsewhere. The samples were characterized by X-Ray Diffractometer (XRD) and SEM. The results appears that the α-TCP milling in 48 hours, were able to form whiskers with thinness crystal, which can be observed in the SEM images. Also, by the results of the XRD analysis was able to observe that the phase of the whiskers was suchlike the hydroxapatite JCPDS 09-0432. However, the peaks were not well defined, primarily, when it is compared without milling. Its characterization shows peaks more defined and crystals more larges in the SEM images, this occurs because the size of α-TCP particles. When milling 24 hours, the results are the same without milling, probity because the similarly of their size. In all of the three cases, the α-TCP were just like the patterns JCPDS 09-034.

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Presentation: Oral at E-MRS Fall Meeting 2009, Symposium F, by Guinéa Brasil C. Cardoso
See On-line Journal of E-MRS Fall Meeting 2009

Submitted: 2009-05-25 22:44
Revised:   2009-06-30 19:59
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