期刊
BIOMATERIALS
卷 29, 期 27, 页码 3636-3641出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.biomaterials.2008.05.021
关键词
mechanical properties; crack; alumina; zirconia; nanocomposite; fatigue
Mechanical properties and slow crack growth (SCG) behavior of a 10Ce-TZP/Al2O3 nanocomposite currently developed as a biomaterial are considered. Fracture toughness is determined for sharp, long (double torsion) and short (indentation) cracks and a good agreement is found between the two types of Cracks. The main toughening mechanism in the nanocomposite is the tetragonal to monoclinic phase transformation of the ceria-stabilized zirconia (Ce-TZP) phase. Transformation at the surface of ground specimens leads to surface Compressive induced stresses and an increase in strength. Crack velocity curves (V-K-I curves) are obtained under static and cyclic fatigue using the double torsion method. The static V-K-I Curve in air reveals the three stages characteristic Of Stress corrosion with a threshold K-10 similar to 4.5 MPa m(1/2) and a fracture toughness of 8.8 MPa m(1/2) significantly higher than those of currently used inert bioceramics (i.e. alumina and Y-TZP). A Crack growth accelerating effect is shown under cyclic loading, correlated with a decrease in the threshold. However, the cyclic fatigue threshold (4 MPa m(1/2)) still stands above that of current biomedical grade alumina and zirconia. (C) 2008 Elsevier Ltd. All rights reserved.
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