Mechanical properties of alumina-fluorapatite composites with different titania additive amounts (0, 0.5, 1, 1.4, 2, 3, 4 and 5 wt%) have been investigated between 1200 and 1600℃. The optimum values of densification and mechanical properties of composites have been reached with 1.4 wt% of titania after the sintering process at 1500℃ for 1 h. Thus, the rupture strength of alumina-26.52 wt% Fap-1.4 wt% TiO2 reaches 75 MPa. At higher temperature and beyond 1.4 wt% TiO2 ,the densification and mechanical properties were hindered by the formation of both intergranular porosity and secondary phase. X-ray diffraction (XRD) analysis of alumina-Fap-TiO2 composites shows the formation of aluminium titanate (Al2O3-TiO2:Al2TiO5 ). The 27Al magic angle scanning nuclear magnetic resonance analysis of Al2O3-Fap-TiO2 composites reveals the presence of octahedral and pentahedral aluminium and novel environment relative to tetrahedral aluminium sites.
参考文献
| [1] | S.M. Best;A.E. Porter;E.S. Thian .Bioceramics: Past, present and for the future[J].Journal of the European Ceramic Society,2008(7):1319-1327. |
| [2] | F. Ben Ayed;J. Bouaziz;K. Bouzouita .Calcination and sintering of fluorapatite under argon atmosphere[J].Journal of Alloys and Compounds: An Interdisciplinary Journal of Materials Science and Solid-state Chemistry and Physics,2001(1/2):238-245. |
| [3] | I. Mobasherpour;M. Solati Hashjin;S.S. Razavi Toosi .Effect of the addition ZrO_2-Al_2O_3 on nanocrystalline hydroxyapatite bending strength and fracture toughness[J].CERAMICS INTERNATIONAL,2009(4):1569-1574. |
| [4] | V. Burghelea;A. Melinescu;A. Ianculescu .Tests "TN Vitro" on fluorapatite - alumina Biocomposites[J].Key engineering materials,2002(3):1583-1586. |
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%