Effect of the Mg2+ Substitution on the Sintering Behavior and Compressive Strength of Doped Β-TCP/CPP Ceramics

Alan Christie Silva Dantas; Wilson Acchar

doi:10.4028/www.scientific.net/MSF.798-799.466

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HomeMaterials Science ForumMaterials Science Forum Vols. 798-799Effect of the Mg2+ Substitution on the Sintering...

Effect of the Mg²⁺ Substitution on the Sintering Behavior and Compressive Strength of Doped Β-TCP/CPP Ceramics

Abstract:

β-Tricalcium phosphate (β-TCP) ceramics are of interest for bone requirements implants due to resoption behavior. The mechanical properties of β-TCP, however, are not yet sufficient to allow load bearing application of implants. The aim of this work was to investigate the effect of Mg²⁺ substitution on the strength sintered TCP. Due to promotion of a liquid phase at 1200°C, Calcium pyrophosphate (CPP-C₂P₂O₇) was used to improve the sintering of the samples. The introduction of CPP was promoted by use of a Ca/P molar ratio of 1.45. The powders were synthesized using a mixture of Ca (OH)₂ suspension and diluted H₃PO₄ with addition of MgO and calcined at 750 °C, 900 °C and 1050 °C. The cold isostatic pressing compacts were sintered at 1200 °C and 1300 °C, respectively.It was shown that a small Mg content (1.5 mol%) increased both compressive strength and fractional density of the TCP material sintered at 1200 °C from 132 ± 39 MPa at 92.1 % of fractional density to 193 ± 29 MPa at 94.5 % of theoretical density. Higher amounts of Mg inhibited the grain growth provoking a increase of the boundary mobility activation energy. Abnormal grain growth (AGG) was observed after sintering at 1300°C, as result CPP - liquid phase formation. Increase of Mg content promoted AGG, due to inhibition of grain growth during normal grain growth resulting in a increase of the residual elastic energy of the system.

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Materials Science Forum (Volumes 798-799)

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466-471

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https://doi.org/10.4028/www.scientific.net/MSF.798-799.466

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Online since:

June 2014

Authors:

Alan Christie Silva Dantas*, Wilson Acchar

Keywords:

Abnormal Grain Growth, Calcium Pyrophosphate, Liquid Phase, Mechanical Property, Tricalcium Phosphate

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References

[1] – T. Kokubo, H. -M. Kim and M. Kawashita, Novel bioactive materials with different mechanical properties, Biomaterials 24 (2003) 2161-2175.

DOI: 10.1016/s0142-9612(03)00044-9

Google Scholar

[2] – H. -S. Ryu, K.S. Hong, J. -K. Lee, D.J. Kim, J.H. Lee, B. -S. Chang, C. -K. Lee and S. -S. Chung, Magnesia doped HA/b-TCP ceramics and evaluation of their biocompatibility, Biomaterials 25 (2004) 393-401.

DOI: 10.1016/s0142-9612(03)00538-6

Google Scholar

[3] – R. Enderle, F. Götz-Neunhoeffer, M. Göbbels, F.A. Müller and P. Greil, Influence of magnesium doping on the phase transformation temperature of ß-TCP ceramics examined by Rietveld refinement, Biomaterials 26 (2005) 3379-3384.

DOI: 10.1016/j.biomaterials.2004.09.017

Google Scholar

[4] – F. -H. Lin, C. -C. Lin, C. -M Lu, H. -C. Liu, J. -S. Sun and C. -Y. Wang, Mechanical properties and histological evaluation of sintered b-Ca2P2O7 with Na4P2O7. 10H2O addition, Biomaterials 16 (1995) 793-802.

DOI: 10.1016/0142-9612(95)99642-y

Google Scholar

[5] – T. Kitsugi, T. Yamamuro, T. Nakamura, S. Kotani, T. Kokubo. Four calcium phosphate ceramics as bone substitutes for nonweight-bearing. Biomaterials 14 (1993) 216 –224.

DOI: 10.1016/0142-9612(93)90026-x

Google Scholar

[6] – T. Kitsugi, T. Yamamuro, T. Nakamura, M. Oka. Transmission electron microscopy observations at the interface of bone and four types of calcium phosphate ceramics with different calcium/phosphorus molar ratios. Biomaterials 16 (1995) 1101–1107.

DOI: 10.1016/0142-9612(95)98907-v

Google Scholar

[7] – S. Koo, B. König Jr, S. Allegrini Jr, M. Yoshimoto, M.J. Carbonari, F.F. Mitri-Luiz. Titanium implant osseointegration with calcium pyrophosphate in rabbits. J. Biomed. Mater. Res. B Appl. Biomater. 76 (2006) 373-380.

DOI: 10.1002/jbm.b.30383

Google Scholar

[8] H. -S. Ryu, H. -J. Youm, K.S. Hong, B. -S. Chang, C. -K. Lee and S. -S. Chung, An improvement in sintering property of b- tricalcium phosphate by addition of calcium pyrophosphate, Biomaterials 23 (2002) 909-914.

DOI: 10.1016/s0142-9612(01)00201-0

Google Scholar

[9] – M. Jarcho, C.H. Bolen, M.B. Thomas, J. Bobick, J.F. Kay and R.H. Doremus, Hydroxylapatite synthesis and characterization in dense polycrystallind form, J Mater. Sci 11 (1976) 2027-(2035).

DOI: 10.1007/pl00020328

Google Scholar

[10] – M. Hillert: Acta Metall. 13 (1965) 227 – 238.

Google Scholar

[11] – H. Song and R.L. Coble:. J. Am. Ceram. Soc. 73 (1990) (2077).

Google Scholar

[12] – D.J. Srolovitz, G.S. Grest and M.P. Anderson, Computer simulation of grain growth – V. Abnormal grain growth. Acta Metall. 33 (1985) 2233 – 2247.

DOI: 10.1016/0001-6160(85)90185-3

Google Scholar