Effect of the SBF Concentration on the Apatite-Forming Ability of ASTM F75 Alloy Induced by Wollastonite


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A method to promote a bioactive surface on the cobalt base alloy ASTM F75 was tested. A set of cylindrical samples was obtained using the investment casting technique and one of the flat surfaces of each sample was polished. The samples were packed in wollastonite powder and then heat treated for 1 h at 1220°C. To characterize the in vitro bioactivity, a set of heat treated metallic specimens was immersed in a simulated body fluid with an ionic concentration nearly equal to that of human blood plasma (SBF) for 7, 10 and 21 days. To evaluate the effect of increasing the concentration of the simulated body fluid on the bioactivity of the material, a second set of heat treated samples was immersed in a more concentrated solution (1.5 SBF). In both cases the solution was renewed every 7 days. After heat treatment, fine agglomerates homogeneously distributed, containing O, Ca, Si and Al were observed on the metallic surface. After immersion of the samples in simulated body fluids, a ceramic layer containing Ca and P was formed on all the samples. A thicker layer, identified as apatite by XRD, was formed on the samples immersed for 21 days in SBF and as early as 7 days in 1.5 SBF. This may indicate that the heat treated material is useful for bone replacement and tissue regeneration under highly loaded conditions.



Key Engineering Materials (Volumes 493-494)

Main Theme:

Edited by:

Eyup Sabri Kayali, Gultekin Goller and Ipek Akin






J.C. Ortiz-Cuellar et al., "Effect of the SBF Concentration on the Apatite-Forming Ability of ASTM F75 Alloy Induced by Wollastonite", Key Engineering Materials, Vols. 493-494, pp. 519-523, 2012

Online since:

October 2011




[1] R.V. Noort: J. Mater. Sci. 22 (1987) 3801-3809.

[2] T. Miyazaki, H.M. Kim, F. Miyaji, T. Kokubo and T. Nakamura, Bioceramics 10 (1997) 497-502.

[3] C. Wang, J. Ma, W. Cheng, R. Zhang, Mater. Lett. 57 (2002) 99-103.

[4] T. Sohmura, H. Tamasaki, T. Ohara and J. Takahasi, J. Biomed. Mater. Res. 58 (2001) 478-485.

[5] J.M. Almanza, J.C. Escobedo, J.C. Ortiz and D.A. Cortés, J. Biomed. Mater. Res. 78A (2006) 34-41.

[6] A. Salinas, M. Soria and H. López, The Effect of Carbon on the Mechanical Strength of Heat Treated Cast Co27Cr5Mo Alloys, in: Processing and fabrication of Advanced Materials V, The Minerals, Metals & Materials Society, Cincinnati Ohio, USA 1996, pp.69-79.

[7] J.C. Escobedo, J.C. Ortiz, J.M. Almanza, D.A. Cortes, Scripta Mater. 54 (2006) 1611-1615.

[8] Juan Carlos Ortiz, Dora Cortés, José Escobedo, José Almanza, Mater. Lett. 62 (2008) 1270-1274.

DOI: 10.1016/j.matlet.2007.08.029

[9] T. Kokubo, H. Kushitani and S. Sakka, J. Biomed. Mater. Res. 24 (1990) 721-734.

[10] J. C. Ortiz-Cuellar, D. A. Cortés-Hernándezb, J. C. Escobedo-Bocardoc and J. M. Almanza Robles, Bioceramics 20 (2008) 653-656.

[11] LeGeros R. Z. and LeGeros J. P, Dense Hidroxiapatite", in: An introduction to bioceramics; Ed. Hench and J. Wilson, World Scientific, Singapore 1993, pp.137-179.

[12] P.N. De Aza, F. Guitian and S. De Aza: Scripta Mater. 31 (1994) 1001-1007.

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